Patent Publication Number: US-2023143692-A1

Title: High-pressure rotating fitting

Description:
TECHNICAL FIELD 
     The present disclosure relates to a fitting for use in material additive processes, and more particularly, to a rotating fitting that reduces fatigue and wear experienced by a supply line during a metal additive process. 
     BACKGROUND 
     Metal spraying is a process used across a range of industries and involves applying a coat of powdered metal to a surface. In metal spraying, metal particles travel at high velocities, in a molten or semi-molten state, before being impinged onto the surface. For example, nitrogen may be heated to temperatures up to 800° C., at a pressures up to 1200 pounds per square inch (PSI) to spray the metal particles. 
     In some cases, spray guns can be used to direct heated, pressurized gas containing metal particles onto a surface of a receiving structure. Such spray guns are usually mounted to robots that articulate according to desired spray patterns. In this process, the heated, pressurized gas containing metal particles are directed to the spray gun via one or more relatively flexible supply lines that are connected to the spray gun via one or more respective couplings. While being flexible enough to provide a steady flow of metal particles to the spray gun during movement of the spray gun, the supply lines and the respective couplings are also robust enough to handle gasses and metal particles at the temperatures and pressures noted above. However, it is common to repeatedly twist, rotate, and/or otherwise manipulate the spray gun and connected power lines during metal spraying processes. Over time, such manipulation causes fatigue in the hot gas supply line and leads to failure. 
     Example components configured to handle fluids at relatively high temperatures and pressures are described in, for example, Chinese Publication No. 108,131,519 (hereinafter the “&#39;519 reference”). The &#39;519 reference describes a rotary sealing joint, having a ball base and a ball head, used for connection between two high-temperature and high-pressure pipelines. Rings included in the rotary sealing joint are packed into a ball seat, between the two high-pressure pipelines, to seal a high-temperature fluid in the pipelines. The rings described in the &#39;519 reference generate elastic-plastic deformation that form a seal of the ball head and the ball base. However, the components describe in the &#39;519 reference are not adaptable to changing conditions in the pipelines and/or further tightening to increase a seal as components become worn. As a result, the rotating sealing joint and other fluid handling components described in the &#39;519 may require routine replacement and/or the rotating sealing joint may fail to seal the pipelines, leading to a loss of pressure. 
     Examples of the present disclosure are directed toward overcoming one or more of the deficiencies noted above. 
     SUMMARY 
     According to a first aspect a fitting comprises a first housing having an outer surface, the outer surface defining a first channel and a second channel spaced from the first channel, a second housing rotatably coupled to the first housing, the second housing having an inner surface, the inner surface defining a third channel and a fourth channel, the third channel mating with and surrounding the first channel to form a first retention chamber, and the fourth channel mating with and surrounding the second channel to form a second retention chamber, a first bearing disposed within the first retention chamber, the first bearing preventing separation of the first housing and the second housing, a second bearing disposed within the second retention chamber, the second bearing preventing separation of the first housing and the second housing, an annular gasket forming a substantially fluid-tight seal between the outer surface of the first housing and the inner surface of the second housing, a plug movably connected to the first housing, the plug being configured to apply a compression force to the annular gasket, the outer surface of the first housing, and the inner surface of the second housing, and a passage defined at least in part by the first housing, the second housing, and the plug. 
     According to a further aspect an assembly comprises a first housing having a first channel, a gasket, a plug coupled to the first housing, the plug engaging the gasket between the first housing and the plug, a second housing disposed over the plug and at least a portion of the first housing, the first housing being rotatable within the second housing, the second housing having a second channel that aligns with the first channel to form a retention chamber, and a bearing disposed within the first channel and the second channel, the bearing preventing separating of the first housing and the second housing. 
     According to a further aspect a fitting comprises a first housing configured to couple to a spray gun, a second housing configured to couple to a supply line, the second housing being disposed over at least a portion of the first housing, the first housing being rotatable within the second housing, the second housing remaining stationary during a rotation of the first housing, a graphite gasket engaging with an interior surface the second housing, and a plug coupled to the first housing, the plug engaging the graphite gasket between the plug and the first housing. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
       The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit or digits of a reference number identifies the figure in which the reference number first appears. The systems depicted in the accompanying figures are not to scale and components within the figures may be depicted not to scale with each other. 
         FIG.  1    illustrates a perspective view of an example first rotating fitting, according to an embodiment of the present disclosure. 
         FIG.  2    illustrates a side view of the first rotating fitting of  FIG.  1   , according to an embodiment of the present disclosure. 
         FIG.  3    illustrates a first end view of the first rotating fitting of  FIG.  1   , according to an embodiment of the present disclosure. 
         FIG.  4    illustrates a second end view of the first rotating fitting of  FIG.  1   , according to an embodiment of the present disclosure. 
         FIG.  5    illustrates an exploded view of the first rotating fitting of  FIG.  1   , according to an embodiment of the present disclosure. 
         FIG.  6    illustrates an exploded cross-sectional view of the first rotating fitting of  FIG.  1   , taken along line A-A of  FIG.  3   , according to an embodiment of the present disclosure. 
         FIG.  7    illustrates a cross-sectional view of the first rotating fitting of  FIG.  1   , taken along line A-A of  FIG.  3   , according to an embodiment of the present disclosure. 
         FIG.  8    illustrates a perspective view of an example second rotating fitting, according to an embodiment of the present disclosure. 
         FIG.  9    illustrates a side view of the second rotating fitting of  FIG.  8   , according to an embodiment of the present disclosure. 
         FIG.  10    illustrates a first end view of the second rotating fitting of  FIG.  8   , according to an embodiment of the present disclosure. 
         FIG.  11    illustrates a second end view of the second rotating fitting of  FIG.  8   , according to an embodiment of the present disclosure. 
         FIG.  12    illustrates an exploded view of the second rotating fitting of  FIG.  8   , according to an embodiment of the present disclosure. 
         FIG.  13    illustrates an exploded cross-sectional view of the second rotating fitting of  FIG.  8   , taken along line B-B of  FIG.  10   , according to an embodiment of the present disclosure. 
         FIG.  14    illustrates a cross-sectional view of the second rotating fitting of  FIG.  8   , taken along line B-B of  FIG.  10   , according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. 
       FIG.  1    illustrates a perspective view of an example rotating fitting  100 . In some instances, the rotating fitting  100  represents a rotary fitting or union that may find use in a high-pressure metal spray processes to remanufacture parts. However, the concepts discussed herein are not limited to such applications, and the rotating fitting  100  may find use in other fields and/or for other purposes, such as hot gas applications that require articulating joints. The rotating fitting  100  is shown including a substantially cylindrical shape, however, other shapes are envisioned (e.g., rectangular, hexagonal, etc.). 
     The rotating fitting  100  includes a proximal end  102 , and a distal end  104  opposite the proximal end  102 . The proximal end  102  is spaced from the distal end  104  along a longitudinal axis  106  of the rotating fitting  100  (e.g., in the X-direction shown in  FIG.  1   ). The proximal end  102  is configured to fluidly connect with and/or otherwise couple to a spray gun (not shown) or other nozzle that is configured to dispense powdered metal, gases (e.g., Nitrogen), and so forth. The proximal end  102  may include threads or other male/female connectors for coupling to the spray gun, for example. The distal end  104  may couple to a supply line (not shown) for receiving the gases. The distal end  104  may include threads or other male/female connectors for coupling to the supply line. The gases are dispersed out of the proximal end  102  in a flow direction  108 . The flow direction  108  is substantially parallel to the longitudinal axis  106  of the rotating fitting  100 . However, in some instances, the flow direction  108  of the rotating fitting is reversed, and material and gas may flow from the proximal end  102  to the distal end  104 . 
     In some instances, the rotating fitting  100  is formed via two housings that operably couple to one another. For example, the rotating fitting  100  may be formed at least in part by a first housing  110  and a second housing  112 . The first housing  110  is shown disposed at the proximal end  102 , while the second housing  112  is shown disposed at the distal end  104 . The first housing  110  represents an inner housing that nestles at least partially within the second housing  112 . Stated alternatively, the second housing  112  may receive or enclose at least part of the first housing  110 . 
     In some instances, the first housing  110  represents a portion of the rotating fitting  100  that rotates during use (e.g., about the X-axis), whereas the second housing  112  represents a portion of the rotating fitting  100  that remains fixed (e.g., stationary) during use. As such, the first housing  110  may rotate within the second housing  112  (e.g., clockwise or counterclockwise about the longitudinal axis  106 ). As discussed herein in regard to  FIGS.  6  and  7   , the first housing  110  and the second housing  112  define, or form, a passage  114  that extends through rotating fitting  100  for channeling the gases out the proximal end  102 . Additionally, as will be discussed in  FIGS.  6  and  7   , the first housing  110  and the second housing  112  may rotatably couple to one another via ball bearings, fasteners, and so forth. Such coupling may secure the first housing  110  within the second housing  112 , and permit the rotational movement of the first housing  110 . However, although the first housing  110  is discussed as rotating within the second housing  112 , in some instances, the first housing  110  may represent a portion of the rotating fitting  100  that remains fixed and the second housing  112  may represent a portion of the rotating fitting  100  that rotates. 
     The rotating fitting  100  reduces, or eliminates, fatigue and failure in supply lines. For example, the rotating fitting  100  permits the spray gun to rotate while keeping the supply line fixed. In other words, the rotating fitting  100  allows for the spray gun to rotate without transferring such movement to the supply line. In doing so, the rotating fitting  100  reduces, or eliminates, fatigue in the supply line. Additionally, the rotating fitting is made from materials that are configured to endure the high temperatures (e.g., between 300° C. and 800° C.) and the high pressures (e.g., between 400 PSI and 1200 PSI) in the supply line. 
       FIG.  2    illustrates a side view of the rotating fitting  100 . As introduced above, the rotating fitting  100  includes the first housing  110  rotatably coupled to the second housing  112 . The first housing  110  couples to a spray gun, at the proximal end  102 , while the second housing  112  couples to a supply line at the distal end  104  for receiving the gases. 
     The rotating fitting  100  is shown including two fasteners  200 , such as a first fastener  200 ( 1 ) and a second fastener  200 ( 2 ) coupled to the second housing  112 . As discussed herein in relation to  FIGS.  5 - 7   , the fasteners  200  may provide access to channels, grooves, or retention chambers within which bearings reside. For example, removing the fasteners  200  from the second housing  112  may expose respective grooves, channel, retention chambers, and the like formed at least in part by the first housing  110  and the second housing  112  (or bodies thereof). When removed, bearings (e.g., ball bearings, cylindrical bearings, tapered bearings, etc.) maybe placed through sockets, passages, or ports within which the first fastener  200 ( 1 ) and the second fastener  200 ( 2 ) engage, respectively. Therein, the bearings may enter the retention chambers, respectively, for coupling the first housing  110  and the second housing  112  together, as well as providing the rotational movement of the rotating fitting  100 . In some instances, the fasteners  200  may represent hexagonal screws that are threaded within the second housing  112 . 
     The first fastener  200 ( 1 ) and the second fastener  200 ( 2 ) are shown spaced apart in a direction along the longitudinal axis  106  by a distance  202  (X-direction). The distance  202  may represent a distance disposed between a centerline of the retention chambers formed in the first housing  110  and the second housing  112 . In other words, the bearings within the retention chambers, which are spaced apart by the distance  202 , may create two regions, areas, zones, or points of contact between the first housing  110  and the second housing  112  that annularly extend around first housing  110  and the second housing  112 . The two points of contact securely couples the first housing  110  and the second housing  112  together, and allows the rotating fitting  100  to endure high pressures (e.g., between approximately 400 PSI and 1200 PSI). 
     The proximal end  102  and the distal end  104  (or respective portions of the first housing  110  and the second housing  112 ) may include fittings or fixtures that accept wrenches, tools, and so forth. Such fixtures assist in tightening the rotating fitting  100  to the spray gun and/or supply line. Additionally, the proximal end  102  (or the first housing  110 ) and/or the distal end  104  (or the second housing  112 ) may include threads with which the spray gun and the supply line mate, respectively. Such threads may be located on an interior of the rotating fitting  100  or on an exterior of the rotating fitting in alternate embodiments. 
     As further shown in  FIG.  2   , the rotating fitting  100  couples at the proximal end  102  to a spray gun  204 . The distal end  104  couples to a supply line  206  for receiving heated gas. The spray gun  204  further couples to other lines, such as a line that supplies powdered metal. Within the spray gun  204  the heated gas and the powdered metal may mix for being dispersed out of the spray gun  204 . 
     The rotating fitting  100  therefore includes components, such as the fasteners  200 , that assist in coupling the first housing  110  and the second housing  112  together. Such coupling may come by way of bearings that reside within retention chambers of the first housing  110  and the second housing  112 . Moreover, the use of bearings provides rotating movement and reduces the amount of motion imparted to the supply line. 
       FIG.  3    illustrates an end view of the rotating fitting  100 . The view shown in  FIG.  3    represents a planar view of the proximal end  102 , looking down into the passage  114  of the rotating fitting  100  towards the distal end  104 . The passage  114 , as noted above, is defined at least in part by the first housing  110  and the second housing  112 , and may span a longitudinal length of the rotating fitting  100  (X-direction). 
     As shown in  FIG.  3   , and as will be discussed in more detail with regard to  FIGS.  5 - 7   , the rotating fitting  100  includes a plug  300  that couples to the first housing  110 . The plug  300  may form a portion of the passage  114  and may be disposed at least partially between the first housing  110  and the second housing  112  (within the rotating fitting  100 ). The plug  300  serves to secure a gasket within the rotating fitting  100 . The gasket seals the first housing  110  and the second housing  112  together to prevent leakage of the gases. During rotation of the first housing  110 , the plug  300  correspondingly rotates with the first housing  110 . 
     The first fastener  200 ( 1 ) and the second fastener  200 ( 2 ) are shown being aligned along a similar plane (Y-plane), or on opposing sides of the second housing  112 . In some instances, the first fastener  200 ( 1 ) and the second fastener  200 ( 2 ) may be disposed at other locations on the second housing  112 , closer to one another, and/or on different planes. 
       FIG.  3    further illustrates a line A-A that extends through the rotating fitting  100 . Details of a cross-sectional view of the rotating fitting  100 , taken along line A-A, are discussed herein with regard to  FIGS.  6  and  7   . 
     The first housing  110 , the second housing  112 , and the plug  300  therefore define the passage  114  through which gases travel, from the distal end  104  to the proximal end  102 . The plug  300 , as will be discussed in further detail herein, further assists in sealing the first housing  110  and the second housing  112  together, preventing leakage of the gases between the first housing  110  and the second housing  112 . 
       FIG.  4    illustrates an end view of the rotating fitting  100 . The view shown in  FIG.  4    represents a view of the distal end  104 , looking into the passage  114  of the rotating fitting  100  towards the proximal end  102 . The passage  114 , as noted above, is defined at least in part by the first housing  110  and the second housing  112 , and may span the longitudinal length of the rotating fitting  100  (X-direction). 
     As introduced above in  FIG.  3   , the rotating fitting  100  includes the plug  300  that couples to the first housing  110 . The plug  300  secures a gasket within the rotating fitting  100 , to create a seal between the first housing  110  and the second housing  112 . The plug  300  is shown including a hexagonal head for coupling the plug  300  to the first housing  110 . In some instances, the plug  300  is tightened after use of the rotating fitting  100  and/or as the gasket becomes worn. For example, further tightening of the plug (e.g., via a hexagonal socket), may compress the gasket between the plug  300  and the first housing  110 . This compression may increase the seal between the first housing  110  and the second housing  112  by radially expanding the gasket against the first housing  110  and the second housing  112 . Additionally, as shown, the hexagonal head of the plug  300  is accessible at the distal end  104 , through the second housing  112 . 
     Therefore, in  FIG.  4   , the plug  300  is used to secure the gasket within the rotating fitting  100 . After a prolonged use of the rotating fitting  100 , and as the gasket becomes worn or in need of replacement, the plug  300  may be further tightened to increase a seal between the first housing  110  and the second housing  112 , and/or may be uncoupled from the first housing  110 . The plug  300  therefore permits maintenance of the rotating fitting  100  in a convenient manner. 
       FIG.  5    illustrates an exploded view of the rotating fitting  100 , showing the first housing  110 , the second housing  112 , the plug  300 , and a gasket  500 . The first housing  110  generally includes a cylindrical shape. The first housing  110  includes a first end  502  and a second end  504 . The first end  502  may correspond to the proximal end  102  of the rotating fitting  100 , and extend exterior to the second housing  112  when the rotating fitting  100  is assembled. The second end  504 , meanwhile, may reside within the second housing  112  when the rotating fitting  100  is assembled. As such, at least a portion of the first housing  110  is sized to reside within the second housing  112 . 
     The first housing  110  includes a first body  506  that at least partially defines retention chambers of the rotating fitting  100 . For example, the first body  506  may include a first channel  508  and a second channel  510  that annularly extends around the first housing  110  (about the longitudinal axis  106 ). In some instances, the first channel  510  and the second channel  510  are formed, at least in part by, an outer surface  538  of the first housing  110 . The first channel  508  may define at least a portion of a first retention chamber of the rotating fitting  100 , and the second channel  510  may define at least a portion of a second retention chamber of the rotating fitting  100 . As discussed herein with regard to  FIG.  7   , bearings may at least partially reside within the first channel  508  and the second channel  510 . 
     The first channel  508  and the second channel  510  are shown including a shape for accommodating ball bearings, however, other shapes are envisioned. As illustrated, for example, the first channel  508  and the second channel  510  include a half-spherical shape. However, the first channel  508  and/or the second channel  510  may include shapes for accommodating roller bearings. The first channel  508  and the second channel  510  are shown spaced away from one another, in a direction along the longitudinal axis  106 . In some instances, the first channel  508  and the second channel  510  may be spaced apart from one another by a distance that is less than or greater than that shown in  FIG.  5   . Moreover, the first body  506  may define additional or fewer channels than shown. The first body  506  is further showing defining a flange  512  at the second end  504 . The flange  512  may at least partially engage the gasket  500  to seat the gasket  500  between the first housing  110  and the plug  300 . The flange  512  extends from the first housing  110 , outwardly, and has an outer diameter for receiving the gasket  500 . 
     The second housing  112  generally includes a cylindrical shape or a cylindrical outer surface. The second housing  112  includes a first end  514  and a second end  516 . The first end  514  may provide an opening  536  for receiving the first housing  110 . As such, at least a portion of the second housing  112  is sized to receive the first housing  110 . That is, when assembled, at least a portion of the first housing  110  is disposed adjacent to a substantially cylindrical interior surface  518  of the second housing  112 . For example, an outer wall of the first housing  110  resides within at least a portion of an inner wall of the second housing  112 . The second end  516 , meanwhile, may correspond to the distal end  104  of the rotating fitting  100  and couple to the supply line. 
     The second housing  112  includes a second body  520  that at least partially defines retention chambers of the rotating fitting  100 . For example, the second body  520  may include a third channel  522  and a fourth channel  524  that are annularly formed with the second housing  112  about the longitudinal axis  106 . In other words, the third channel  522  and the fourth channel are formed by the interior surface  518 . The third channel  522  may define at least a portion of the first retention chamber of the rotating fitting  100 , and the fourth channel  524  may define at least a portion of the second retention chamber of the rotating fitting  100 . The third channel  522  and the fourth channel  524  are shown including a half-spherical shape for accommodating ball bearings, however, other shapes are envisioned. In some instances, the third channel  522  and the fourth channel  524  may be spaced apart from one another by a distance that is less than or greater than shown in  FIG.  5   . Moreover, the second body  520  may define additional or fewer channels than shown. When assembled, the first channel  508  and the third channel  522  may align to define the first retention chamber within which bearings reside. Additionally, the second channel  510  and the fourth channel  524  may align to define the second retention chamber within which bearings reside. 
     The first fastener  200 ( 1 ) and the second fastener  200 ( 2 ) couple to the second housing  112 . The first fastener  200 ( 1 ) assists in securing bearings within the first retention chamber when the rotating fitting  100  is assembled. Similarly, the second fastener  200 ( 1 ) assists in securing bearings within the second retention chamber when the rotating fitting  100  is assembled. Although the first housing  110  and the second housing  112  are shown including two channels for forming portion of the first retention chamber and the second retention chamber, the rotating fitting  100  may include more than or less than two retention chambers. For example, the first housing  110  and the second housing  112  may include a single channel for accommodating bearings, and form a single retention chamber of the rotating fitting  100 . In some instances, additional retention chambers may be added to increase an amount of pressure the rotating fitting  100  is configured to withstand. For example, when the rotating fitting  100  is pressurized, a shear force is exerted on the bearings. Being as the bearings are at least partially disposed in the first housing  110  and the second housing  112 , the bearings resist the shear force and separation of the first housing  110  and the second housing  112 . 
     The plug  300  is shown including a first end  526  and a second end  528 . The first end  526  may thread into the second end  504  of the first housing  110 . The second end  528  may include the hexagonal head to allow the plug  300  to be fastened to and unfastened from the first housing  110  (via inserting a hexagonal socket into the second end  516  of the second housing  112 ). The plug  300  further includes a flange  530  to seat the gasket  500  between the first housing  110  and the plug  300 . For example, the gasket  500  is shown including a ring shape. When the rotating fitting  100  is assembled, the gasket  500  resides between the first housing  110  and the plug  300 . Here, an interior surface  532  of the gasket  500  may engage (e.g., abut, rest, etc.) the flange  530  of the first housing  110  and the flange  530  of the plug  300 . An exterior surface  534  of the gasket  500  may engage with the interior surface  518  of the second housing  112 . Additionally, the gasket  500  is configured to compress between the plug  300  and the first housing  110  to maintain a high temperature and pressure seal. As the gasket  500  is compressed axially (in a direction along the longitudinal axis  106 ), the gasket  500  expands radially (in a direction transverse to the longitudinal axis  106 ) to form a seal between the first housing  110  and the second housing  112 . 
     The first housing  110 , the second housing  112 , the plug  300 , and the gasket  500  are manufactured from materials capable of withstanding temperatures and pressures experienced by the rotating fitting  100 . The materials may be corrosion resistant given the high temperatures and pressures experienced by the rotating fitting  100 . For example, in some instances, the first housing  110 , the second housing  112 , and/or the plug  300  are manufactured from stainless steel (e.g.,  303 ,  304 , etc.), nickel-chrome-based alloys (e.g., Inconels), nickel-alloys (e.g., hastelloy), and so forth. In some instances, the first housing  110 , the second housing  112 , and/or the plug  300  are manufactured from different materials to prevent seizing of the rotating fitting  100 . For example, given that the plug  300  may contact the interior surface  518  of the second housing  112 , the plug  300  may be formed of a first material (e.g., 303 stainless steel) and the second housing  112  may be formed of a second material (e.g., 304 stainless steel). The different materials may prevent a binding between the plug  300  and the second housing  112 . The gasket  500  may be manufactured from graphite, carbon, Teflon, composites, and so forth. The gasket  500  may be a compressible material such that when the plug  300  is tightened onto the first housing  110 , the gasket  500  radially expands to contact and form a seal against the second housing  112 . 
     The rotating fitting  100  therefore includes components that, when assembled, are capable of withstanding increased temperatures and pressures. For example, bearings residing within the retention chambers of the rotating fitting  100  serve to couple the first housing  110  and the second housing  112  together, and form a rotatable coupling between the first housing  110  and the second housing  112 . Further, the gasket  500  seals against the interior surface  518  of the second housing  112  to prevent an egress of the gases from the rotating fitting  100 . 
       FIG.  6    illustrates an exploded view of the rotating fitting  100 . Additionally,  FIG.  6    illustrates a cross-sectional view of the rotating fitting  100 , or components of the rotating fitting  100 , taken along line A-A of  FIG.  3   . 
     During assembly of the rotating fitting  100 , the gasket  500  may be placed over the flange  512  of the first housing  110  and the flange  530  of the plug  300 . For example, the gasket  500  is slid over the flange  512  of the first housing  110  (at the second end  504 ). As discussed above, the plug  300  includes threads that correspondingly engage with threads formed within the first housing  110 . Tightening the plug  300  onto the first housing  110  secures the gasket  500  between the first housing  110  and the plug  300 . After assembling the first housing  110 , the plug  300 , and the gasket  500 , such assembly (e.g., the first housing  110 , the plug  300 , and the gasket  500 ) is inserted into the second housing  112 . Alternatively, the second housing  112  may slide over the first housing  110 , the plug  300 , and the gasket  500 . 
     As the first housing  110  enters the second housing  112  (e.g., in the X-direction), bearings are placed (e.g., fed) into the first channel  508 , the second channel  510 , the third channel  522 , and the fourth channel  524 . For example, the first fastener  200 ( 1 ) and the second fastener  200 ( 2 ) are removed from the second housing  112 . As the first housing  110  advances into the second housing  112 , the first channel  508  and the third channel  522  become aligned (Y-plane). Additionally, the second channel  510  and the fourth channel  524  become aligned (Y-plane). Introduced above with regard to  FIG.  5   , and as shown in  FIG.  7   , the first channel  508  and the third channel  522  form a first retention chamber for first bearings, while the second channel  510  and the fourth channel  524  form a second retention chamber for second bearings. 
     In  FIG.  6   , the first fastener  200 ( 1 ) and the second fastener  200 ( 2 ) are shown uncoupled from the second housing  112 . By removing the first fastener  200 ( 1 ) and the second fastener  200 ( 2 ), bearings are fed through a first port  600  and a second port  602 , respectively. That is, the first port  600  and the second port  602  provide access to the retention chambers such that bearings may be placed within the first channel  508 , the second channel  510 , the third channel  522 , and the fourth channel  524 , respectively. As bearings are supplied, the bearings begin to occupy the first channel  508 , the second channel  510 , the third channel  522 , and the fourth channel  524 . Upon filling of the first channel  508 , the second channel  510 , the third channel  522 , and the fourth channel  524 , the first fastener  200 ( 1 ) and the second fastener  200 ( 2 ) are coupled to the second housing  112 . For example, the first fastener  200 ( 1 ) threads into the first port  600  and the second fastener  200 ( 2 ) threads into the second port  602 . The fastening of the first fastener  200 ( 1 ) and the second fastener  200 ( 2 ) secure the bearings within the first channel  508 , the second channel  510 , the third channel  522 , and the fourth channel  524 . As shown, the first port  600  and the second port  602  extend through a thickness, or wall, of the second housing  112 , from an outer surface to the interior surface  518 . 
     Additionally, when the first fastener  200 ( 1 ) and the second fastener  200 ( 2 ) couple to the second housing  112 , the first fastener  200 ( 1 ) and the second fastener  200 ( 2 ) may occupy at least a portion of the first channel  508 , the second channel  510 , the third channel  522 , and/or the fourth channel  524 , respectively. In such instances, the first channel  508 , the second channel  510 , the third channel  522 , and the fourth channel  524  may be void of bearings directly beneath the first port  600  and the second port  602 , respectively, thereby allowing the first fastener  200 ( 1 ) and the second fastener  200 ( 2 ) to couple to the second housing  112 . Given this design, the bearings may remain stationary within the first channel  508 , the second channel  510 , the third channel  522 , and the fourth channel  524  as the first housing  110  rotates. However, the bearings are permitted to rotate about their respective axes. 
     The bearings within the first channel  508 , the second channel  510 , the third channel  522 , and the fourth channel  524  couple the first housing  110  and the second housing  112  together. That is, once the bearings are inserted into the first channel  508 , the second channel  510 , the third channel  522 , and the fourth channel  524 , the bearings prevent the separation of the first housing  110  and the second housing  112  (in the X-direction). More particularly, being as bearings are disposed within the first channel  508  and the third channel  522 , the bearings serve to prevent separation of the first housing  110  and the second housing  112 . Additionally, being as bearings are disposed within the second channel  510  and the fourth channel  524 , the bearings serve to prevent separation of the first housing  110  and the second housing  112 . In other words, during pressurizing of the rotating fitting  100 , a shear force is exerted on the bearings. However, being as the bearings engage with the first housing  110  and the second housing  112 , the bearings resist the shear force and separation of the first housing  110  and the second housing  112 . The rotating fitting  100  therefore includes components for coupling the first housing  110  and the second housing  112 . The coupling may come by way of bearings that are disposed in channels of the first housing  110  and the second housing  112 , respectively. Moreover, the bearings permit rotation of the first housing  110  to provide rotational movement of the spray gun, for example, coupled to the first housing  110 . The gasket  500  further seals the first housing  110  and the second housing  112  to prevent leakages and a loss of pressure within the rotating fitting  100 . 
       FIG.  7    illustrates an assembled cross-sectional view of the rotating fitting  100 , taken along line A-A of  FIG.  3   . The first housing  110  is shown at least partially disposed within the second housing  112 . Moreover, as explained above with regard to  FIG.  6   , when the first housing  110  is placed within the second housing  112 , the first channel  508  and the third channel  522  form a first retention chamber  700 . First bearings  702 ( 1 ) reside within the first retention chamber  700  and couple the first housing  110  and the second housing  112 . That is, the first bearings  702 ( 1 ) resist longitudinal movement (X-direction) of the first housing  110  and the second housing  112  relative to one another. When the first housing  110  and the second housing  112  are coupled together, the first bearings  702 ( 1 ) resist a shear force applied from the pressure experienced by the rotating fitting  100 . Similarly, when the first housing  110  is placed within the second housing  112 , the second channel  510  and the third channel  522  form a second retention chamber  704 . Second bearings  702 ( 2 ) reside within the second retention chamber  704  and couple the first housing  110  and the second housing  112 . The second bearings  702 ( 2 ) resist longitudinal movement (X-direction) of the first housing  110  and the second housing  112  relative to one another. When the first housing  110  and the second housing  112  are coupled together, the first bearings  702 ( 1 ) resist a shear force applied from the pressure experienced by the rotating fitting  100 . 
     In some instances, the first channel  508  may receive substantially half of individual bearings of the first bearings  702 ( 1 ), and the third channel  522  may receive substantially half of the individual bearings of the first bearings  702 ( 1 ). Additionally, the second channel  510  may receive substantially half of individual bearings of the second bearings  702 ( 2 ), and the fourth channel  524  may receive substantially half of the individual bearings of the second bearings  702 ( 2 ). However, equal portions of the first bearings  702 ( 1 ) need not reside in the first channel  508  and the third channel  522 , and/or equal portions of the second bearings  702 ( 2 ) need not reside in the second channel  510  and the fourth channel  524 . In such instances, the first channel  508  and the second channel  510  may include a greater or lesser depth in the first body  506  of the first housing  110 , and/or the third channel  522  and the fourth channel  524  may include a greater or lesser depth in the second body  520  of the second housing  112 . For example, the first body  506  may form greater than half of the first channel  508  and/or the second channel  510 , and/or the second body  520  may form greater than half of the third channel  522  and/or the fourth channel  524 . 
     Additionally, although the first retention chamber  700  and the second retention chamber  704  are shown being semi-circular in shape, other shapes are envisioned for accommodating differently shaped bearings (e.g., roller bearings, tapered bearings, etc.). As also shown, the first fastener  200 ( 1 ) is at least partially disposed within the first retention chamber  700  (or a portion of the first channel  508  and/or the third channel  522 ), and the second fastener  200 ( 2 ) is at least partially disposed within the second retention chamber  704  (or a portion of the second channel  510  and/or the fourth channel  524 ). Such design prevents the first bearings  702 ( 1 ) and the second bearings  702 ( 2 ) annularly rotating about the first retention chamber  700  and the second retention chamber  704 , respectively. 
     The gasket  500  is shown disposed between the first housing  110  and the plug  300 . The interior surface  532  of the gasket  500  engages with the flange  512  of the first housing  110  and the flange  530  of the plug  300 . The exterior surface  534  of the of the gasket  500  engages with the interior surface  518  of the second housing  112 . As the first housing  110  rotates, the gasket  500  engages with the interior surface  518  of the second housing  112  to provide a seal between the first housing  110  and the second housing  112 . In some instances, tightening the plug  300  compresses the gasket  500  against the interior surface  518  of the second housing  112 . For example, as the plug  300  is tightened, the gasket  500  is compressed between the plug  300  and the first housing  110 . This compression may result in the gasket  500  applying a force against the interior surface  518  of the second housing  112 . As the gasket  500  experiences wear, the plug  300  may be tightened to further secure the gasket  500  and seal the gasket  500  with the second housing  112 . For example, a hexagonal socket maybe placed through the distal end  104  of the rotating fitting  100  and engaged with the hexagonal head of the plug  300 . 
     In some instances, edges or surfaces of the first housing  110  and/or the second housing  112  may be chamfered or rounded to prevent damage to the gasket  500 . For example, as the gasket  500  is inserted into the second housing  112 , edges of the first port  600  and/or the second port  602 , for example, may be chamfered to prevent damage to the gasket  500 . After assembly, the first housing  110 , the second housing  112 , and the plug  300  for the passage  114  of the rotating fitting  100 , between the proximal end  102  and the distal end  104 . 
     Although the proximal end  102  and the distal end  104  of the rotating fitting  100  are shown including certain receptacles for receiving the spray gun and supply line, respectively, the receptacles may be differently shaped than shown and/or attachments may couple to the proximal end  102  and the distal end  104 . For example, a 90 degree or 45 degree elbow may couple to the proximal end  102  and/or the distal end  104  of the rotating fitting  100 . Additionally, although the rotating fitting  100  is shown including two retention chambers, the rotating fitting  100  may include more than or less than two retention chambers. The first retention chamber  700  and the second retention chamber  704 , may also be spaced apart from one another differently than shown (e.g., spaced closer to one another or spaced farther from one another). Additionally, the proximal end  102  is shown including a receptacle (e.g., slot) for receiving the spray gun and the distal end  104  is shown including a receptacle (e.g., threads) for receiving the supply line. As shown, the receptacles may be located within an interior of the rotating fitting  100 . 
     The rotating fitting  100  therefore permits rotation of the first housing  110  inside the second housing  112 . Additionally, the first bearings  702 ( 1 ) and the second bearings  702 ( 2 ) engage with the first retention chamber  700  and the second retention chamber  704 , respectively, formed within the first housing  110  and the second housing  112 . The first bearings  702 ( 1 ) and the second bearings  702 ( 2 ) resist separation of the first housing  110  and the second housing  112  as the rotating fitting  100  experiences pressures associated with metal spray processes (e.g., 1200 PSI). Further, the first bearings  702 ( 1 ) and the second bearings  702 ( 2 ) provide rotational movement to the first housing  110 , which is coupled to a spray gun, for example, to reduce movement being imparted to a supply line coupled to the second housing  112 . 
       FIG.  8    illustrates a perspective view of an example rotating fitting  800 . Compared to the rotating fitting  100  as discussed above with regard to  FIGS.  1 - 7   , the rotating fitting  800  may include components for attaching to a supply line and a spray gun on an exterior of the rotating fitting  800 . That is, the rotating fitting  800  may include threads, for example, located on an exterior of the rotating fitting  800 . Locating the threads on an exterior of the rotating fitting  800  may allow the supply line and the spray gun to be conveniently secured to the rotating fitting  800  and/or may reduce debris, soot, and so forth accumulating on threads disposed within the interior (as compared to the rotating fitting  100 ). 
     The rotating fitting  800  may find use in high-pressure metal spray processes to remanufacture parts. However, the concepts discussed herein are not limited to such applications, and the rotating fitting  800  may find use in other fields and/or for other purposes. The rotating fitting  800  is shown including a substantially cylindrical shape, however, other shapes are envisioned (e.g., rectangular, hexagonal, etc.). 
     The rotating fitting  800  includes a proximal end  802 , and a distal end  804  opposite the proximal end  802 . The proximal end  802  is spaced apart in a direction along a longitudinal axis  806  of the rotating fitting  800  (e.g., in the X-direction shown in  FIG.  8   ). The proximal end  802  is configured to fluidly connect with and/or otherwise couple to a spray gun (not shown) or other nozzle for dispensing the gases. The proximal end  802  may include threads or other male/female connectors for coupling to the spray gun, for example. As shown and as introduced above, such threads may be located on an exterior of the rotating fitting  800 . The distal end  804  may couple to a supply line (not shown) for receiving the gases. The distal end  804  may include threads or other male/female connectors for coupling to the supply line, which may be located on an exterior of the rotating fitting  800 . As such, the gases are dispersed out of the proximal end  802  in a flow direction  808 . The flow direction  808  is substantially parallel to the longitudinal axis  806  of the rotating fitting  800 . 
     In some instances, the rotating fitting  800  is formed via two housings that operably couple to one another. For example, the rotating fitting  800  may be formed at least in part by a first housing  810  and a second housing  812 . The first housing  810  is shown disposed at the proximal end  802 , while the second housing  812  is shown disposed at the distal end  804 . The first housing  810  represents an inner housing that nestles at least partially within the second housing  812 . Stated alternatively, the second housing  812  may receive or enclose at least part of the first housing  810 . 
     In some instances, the first housing  810  represents a portion of the rotating fitting  800  that rotates during use (e.g., about the X-axis), whereas the second housing  812  represents a portion of the rotating fitting  800  that remains fixed (e.g., stationary) during use. As such, the first housing  810  may rotate within the second housing  812  (e.g., clockwise or counterclockwise about the longitudinal axis  806 ). As discussed herein in regard to  FIGS.  13  and  14   , the first housing  810  and the second housing  812  define, or form, a passage  814  that extends through the rotating fitting  800  for channeling the gases out the proximal end  802 . Additionally, as will be discussed in  FIGS.  13  and  14   , the first housing  810  and the second housing  812  may rotatably couple to one another via ball bearings, fasteners, and so forth. Such coupling may secure the first housing  810  within the second housing  812 , and permit the rotational movement of the first housing  810 . However, although the first housing  810  is discussed as rotating within the second housing  812 , in some instances, the first housing  810  may represent a portion of the rotating fitting  800  that remains fixed and the second housing  812  may represent a portion of the rotating fitting  800  that rotates. 
     The rotating fitting  800  reduces, or eliminates, fatigue and failure in supply lines. For example, the rotating fitting  800  permits the spray gun, nozzle, and so forth to rotate while keeping the supply line fixed. In other words, the rotating fitting  800  allows for the spray gun to rotate without transferring such movement to the supply line. In doing so, the rotating fitting  800  reduces, or eliminates, fatigue in the supply line. 
       FIG.  9    illustrates a side view of the rotating fitting  800 . As introduced above, the rotating fitting  800  includes the first housing  810  rotatably coupled to the second housing  812 . The first housing  810  couples to the spray gun, at the proximal end  802 , while the second housing  812  couples to a supply line at the distal end  804  for receiving the gases. 
     The rotating fitting  800  is shown including two fasteners  900 , such as a first fastener  900 ( 1 ) and a second fastener  900 ( 2 ) coupled to the second housing  812 . As discussed herein in relation to  FIGS.  12 - 14   , the fasteners  900  may provide access to channels, grooves, or retention chambers within which bearings reside. For example, removing the fasteners  900  from the second housing  812  may expose respective retention chambers formed at least in part by the first housing  810  and the second housing  812 . When removed, bearings (e.g., ball bearings, cylindrical bearings, tapered bearings, etc.) may be placed through sockets, passages, or ports within which the first fastener  900 ( 1 ) and the second fastener  900 ( 2 ) engage. Therein, the bearings may enter the retention chambers, respectively, for coupling the first housing  810  and the second housing  812  together, as well as providing the rotational movement of the rotating fitting  800 . In some instances, the fasteners  900  may represent hexagonal screws that are threaded within the second housing  812 . 
     The first fastener  900 ( 1 ) and the second fastener  900 ( 2 ) are shown spaced apart in a direction along the longitudinal axis  806  by a distance  902  (X-direction). The distance  902  may represent a distance disposed between a centerline of the retention chambers formed in the first housing  810  and the second housing  812 . In other words, the bearings within the retention chambers, which are spaced apart by the distance  902 , may create two regions, areas, zones, or points of contact between the first housing  810  and the second housing  812 . The two points of contact securely couple the first housing  810  and the second housing  812  together, and allows the rotating fitting  800  to endure high pressures (e.g., between 400 PSI and 1200 PSI). 
     The proximal end  802  and the distal end  804  (or respective portions of the first housing  810  and the second housing  812 ) may include fittings or fixtures that accept wrenches, tools, and so forth. Such fixtures assist in tightening the rotating fitting  800  to the spray gun and/or supply line. 
     As further shown in  FIG.  9   , the rotating fitting  800  couples at the proximal end  802  to a spray gun  904 . The distal end  804  couples to a supply line  906  for receiving heated gas. The spray gun  904  further couples to other lines, such as a line that supplies powdered metal. Within the spray gun  904  the heated gas and the powdered metal may mix for being dispersed out of the spray gun  904 . 
     The rotating fitting  800  therefore includes components, such as the fasteners  900 , that assist in coupling the first housing  810  and the second housing  812  together. Such coupling may come by way of bearings that reside within retention chambers of the first housing  810  and the second housing  812 . Moreover, the use of bearings provides rotating movement and reduces the amount of motion imparted to the supply line. 
       FIG.  10    illustrates an end view of the rotating fitting  800 . The view shown in  FIG.  10    represents a planar view of the proximal end  802 , looking down into the passage  814  of the rotating fitting  800  towards the distal end  804 . The passage  814 , as noted above, is defined at least in part by the first housing  810  and the second housing  812 , and may span a longitudinal length of the rotating fitting  800  (X-direction). 
     As shown in  FIG.  10   , but as will be discussed in more detail with regard to  FIGS.  12 - 14   , the rotating fitting  800  includes a plug  1000  that couples to the first housing  810 . The plug  1000  may form a portion of the passage  814  and may be disposed at least partially between the first housing  810  and the second housing  812  (within the rotating fitting  800 ). The plug  1000  serves to secure a gasket within the rotating fitting  800 . The gasket seals the first housing  810  and the second housing  812  together. During rotation of the first housing  810 , the plug  1000  correspondingly rotates with the first housing  810 . 
     The first fastener  900 ( 1 ) and the second fastener  900 ( 2 ) are shown being aligned along a similar plane (Y-plane), or on opposing sides of the second housing  812 . In some instances, the first fastener  900 ( 1 ) and the second fastener  900 ( 2 ) may be disposed at other locations on the second housing  812 , closer to one another, and/or on different planes. 
       FIG.  10    further illustrates a line B-B that extends through the rotating fitting  800 . Details of a cross-sectional view of the rotating fitting  800 , taken along line B-B, are discussed herein with regard to  FIGS.  13  and  14   . 
     The first housing  810 , the second housing  812 , and the plug  1000  therefore define the passage  814  through which the gases travel, from the distal end  804  to the proximal end  802 . The plug  1000 , as will be discussed in further detail herein, further assists in sealing the first housing  810  and the second housing  812  together, preventing leakage of the gases between the first housing  810  and the second housing  812 . 
       FIG.  11    illustrates an end view of the rotating fitting  800 . The view shown in  FIG.  11    represents a planar view of the distal end  804 , looking into the passage  814  of the rotating fitting  800  towards the proximal end  802 . The passage  814 , as noted above, is defined at least in part by the first housing  810  and the second housing  812 , and may span a longitudinal length of the rotating fitting  800  (X-direction). 
     As introduced above in  FIG.  10   , the rotating fitting  800  includes the plug  1000  that couples to the first housing  810 . The plug  1000  secures a gasket within the rotating fitting  800 , to create a seal between the first housing  810  and the second housing  812 . The plug  1000  is shown including a hexagonal head for coupling the plug  1000  to the first housing  810 . In some instances, the plug  1000  is tightened after use of the rotating fitting  800  and/or as the gasket becomes worn. For example, further tightening of the plug (e.g., via a hexagonal socket), may compress the gasket between the plug  1000  and the first housing  810 . This compression may increase the seal between the first housing  810  and the second housing  812 . 
     Therefore, in  FIG.  4   , the plug  1000  is used to secure the gasket within the rotating fitting  800 . After a prolonged use of the rotating fitting  800 , as the gasket becomes worn or in need of replacement, the plug  1000  may be further tightened to increase a seal between the first housing  810  and the second housing  812 , and/or may be uncoupled from the first housing  810 . The plug  1000  therefore permits maintenance of the rotating fitting  800  in a convenient manner. 
       FIG.  12    illustrates an exploded view of the rotating fitting  800 , showing the first housing  810 , the second housing  812 , the plug  1000 , and a gasket  1200 . The first housing  810  generally includes a cylindrical shape. The first housing  810  includes a first end  1202  and a second end  1204 . The first end  1202  may correspond to the proximal end  802  of the rotating fitting  800 , and extend exterior to the second housing  812  when the rotating fitting  800  is assembled. The second end  1204 , meanwhile, may reside within the second housing  812  when the rotating fitting  800  is assembled. As such, at least a portion of the first housing  810  is sized to reside within the second housing  812 . 
     The first housing  810  includes a first body  1206  that at least partially defines retention chambers of the rotating fitting  800 . For example, the first body  1206  may include a first channel  1208  and a second channel  1210  that annularly extend around the first housing  810  (about the longitudinal axis  806 ). In some instances, the first channel  1208  and the second channel  1210  are formed, at least in part by, an outer surface  1238  of the first housing  810 . The first channel  1208  may define at least a portion of a first retention chamber of the rotating fitting  800 , and the second channel  1210  may define at least a portion of a second retention chamber of the rotating fitting  800 . As discussed herein with regard to  FIG.  14   , bearings may at least partially reside within the first channel  1208  and the second channel  1210 . 
     The first channel  1208  and the second channel  1210  are shown including a semi-spherical or circular shape for accommodating ball bearings, however, other shapes are envisioned. For example, the first channel  1208  and/or the second channel  1210  may include shapes for accommodating roller bearings. The first channel  1208  and the second channel  1210  are shown spaced away from one another, in a direction along the longitudinal axis  806  of the rotating fitting  800 . The first body  1206  is further showing defining a flange  1212  at the second end  1204 . The flange  1212  may at least partially engage the gasket  1200  to seat the gasket  1200  between the first housing  810  and the plug  1000 . The flange  1212  extends from the first housing  810 , outwardly, and has an outer diameter for receiving the gasket  1200 . 
     The second housing  812  generally includes a cylindrical shape. The second housing  812  includes a first end  1214  and a second end  1216 . The first end  1214  may provide an opening  1236  for receiving the first housing  810 . As such, at least a portion of the second housing  812  is sized to receive the first housing  810 . That is, when assembled, at least a portion of the first housing  810  is disposed adjacent to a substantially cylindrical interior surface  1218  of the second housing  812 . For example, an outer wall of the first housing  810  resides within at least a portion of an inner wall of the second housing  812 . The second end  1216 , meanwhile, may correspond to the distal end  804  of the rotating fitting  800  and couple to the supply line. 
     The second housing  812  includes a second body  1220  that at least partially defines retention chambers of the rotating fitting  800 . For example, the second body  1220  may include a third channel  1222  and a fourth channel  1224  that annularly extend within the second housing  812  (about the longitudinal axis  806 ). The third channel  1222  may define at least a portion of the first retention chamber of the rotating fitting  800 , and the fourth channel  1224  may define at least a portion of the second retention chamber of the rotating fitting  800 . The third channel  1222  and the fourth channel  1224  are shown including a shape for accommodating ball bearings, however, other shapes are envisioned. When assembled, the first channel  1208  and the third channel  1222  define the first retention chamber within which bearings reside. Additionally, the second channel  1210  and the fourth channel  1224  define the second retention chamber within which bearings reside. 
     The first fastener  900 ( 1 ) and the second fastener  900 ( 2 ) couple to the second housing  812 . The first fastener  900 ( 1 ) assists in securing bearings within the first retention chamber when the rotating fitting  800  is assembled. Similarly, the second fastener  900 ( 2 ) assists in securing bearings within the second retention chamber when the rotating fitting  800  is assembled. Although the first housing  810  and the second housing  812  are shown including two channels for forming portions of the first retention chamber and the second retention chamber, the rotating fitting  800  may include more than or less than two retention chambers. For example, the first housing  810  and the second housing  812  may include a single channel for accommodating bearings, and form a single retention chamber of the rotating fitting  800 . In some instances, additional retention chambers may be added to increase an amount of pressure the rotating fitting  800  is configured to withstand. For example, when the rotating fitting  800  is pressurized, a shear force is exerted on the bearings. Being as the bearings are at least partially disposed in the first housing  810  and the second housing  812 , the bearings resist the shear force and separation of the first housing  810  and the second housing  812 . 
     The plug  1000  is shown including a first end  1226  and a second end  1228 . The first end  1226  may thread into the second end  1204  of the first housing  810 . The second end  1228  may include the hexagonal head to allow the plug  1000  to be fastened to and unfastened from the first housing  810 . The plug  1000  further includes a flange  1230  to seat the gasket  1200  between the first housing  810  and the plug  1000 . For example, the gasket  1200  is shown including a ring shape. When the rotating fitting  800  is assembled, the gasket  1200  resides between the first housing  810  and the plug  1000 . Here, an interior surface  1232  of the gasket  1200  may engage (e.g., abut, rest, etc.) the flange  1212  of the first housing  810  and the flange  1230  of the plug  1000 . An exterior surface  1234  of the gasket  1200  may engage with the interior surface  1218  of the second housing  812 . 
     The first housing  810 , the second housing  812 , the plug  1000 , and the gasket  1200  may be manufactured from materials capable of withstanding temperatures and pressures experienced by the rotating fitting  800 . For example, in some instances, the first housing  810  may be manufactured from stainless steel. Additionally, or alternatively, the second housing  812  may be manufactured from stainless steel. The gasket  1200  may be manufactured from graphite, carbon, Teflon, composites, and so forth. 
     The rotating fitting  800  therefore includes components that, when assembled, are capable of withstanding increased temperatures and pressures. For example, bearings residing within the retention chambers of the rotating fitting  800  serve to couple the first housing  810  and the second housing  812  together, and form a rotatable coupling between the first housing  810  and the second housing  812 . Further, the gasket  1200  seals against the interior surface  1218  of the second housing  812  to prevent an gases. 
       FIG.  13    illustrates an exploded view of the rotating fitting  800 . Additionally,  FIG.  13    illustrates a cross-sectional view of the rotating fitting  800 , or components of the rotating fitting  800 , taken along line B-B of  FIG.  10   . 
     During assembly of the rotating fitting  800 , the gasket  1200  may be placed over the flange  1212  of the first housing  810  and the flange  1230  of the plug  1000 . For example, the gasket  1200  is slid over the flange  1212  of the first housing  810  (at the second end  1204 ). As discussed above, the plug  1000  includes threads that correspondingly engage with threads formed within the first housing  810 . Tightening the plug  1000  onto the first housing  810  secures the gasket  1200  between the first housing  810  and the plug  1000 . After assembling the first housing  810 , the plug  1000 , and the gasket  1200  together, such assembly is inserted into the second housing  812 . Alternatively, the second housing  812  may slide over the first housing  810 , the plug  1000 , and the gasket  1200 . 
     As the first housing  810  enters the second housing  812  (e.g., in the X-direction), bearings are placed (e.g., fed) into the first channel  1208 , the second channel  1210 , the third channel  1222 , and the fourth channel  1224 . For example, the first fastener  900 ( 1 ) and the second fastener  900 ( 2 ) are removed from the second housing  812 . As the first housing  810  advances into the second housing  812 , the first channel  1208  and the third channel  1222  become aligned (Y-plane). Additionally, the second channel  1210  and the fourth channel  1224  become aligned (Y-plane). Introduced above with regard to  FIG.  13   , and as shown in  FIG.  14   , the first channel  1208  and the third channel  1222  form a first retention chamber for first bearings, while the second channel  1210  and the fourth channel form a second retention chamber for second bearings. 
     In  FIG.  13   , the first fastener  900 ( 1 ) and the second fastener  900 ( 2 ) are shown uncoupled from the second housing  812 . By removing the first fastener  900 ( 1 ) and the second fastener  900 ( 2 ), bearings are fed through a first port  1300  and a second port  1302 , respectively. That is, the first port  1300  and the second port  1302  provide access such that bearings may be placed within the first channel  1208 , the second channel  1210 , the third channel  1222 , and the fourth channel  1224 , respectively. As bearings are supplied, the bearings begin to occupy the first channel  1208 , the second channel  1210 , the third channel  1222 , and the fourth channel  1224 . Upon filling of the first channel  1208 , the second channel  1210 , the third channel  1222 , and the fourth channel  1224 , the first fastener  900 ( 1 ) and the second fastener  900 ( 2 ) are coupled to the second housing  812 . For example, the first fastener  900 ( 1 ) threads into the first port  1300  and the second fastener  900 ( 2 ) threads into the second port  1302 . The fastening of the first fastener  900 ( 1 ) and the second fastener  900 ( 2 ) secure the bearings within the first channel  1208 , the second channel  1210 , the third channel  1222 , and the fourth channel  1224 . As shown, the first port  600  and the second port  602  extend through a thickness, or wall, of the second housing  812 , from an outer surface to the interior surface  1218 . 
     Additionally, when the first fastener  900 ( 1 ) and the second fastener  900 ( 2 ) couple to the second housing  812 , the first fastener  900 ( 1 ) and the second fastener  900 ( 2 ) may occupy at least a portion of the first channel  1208 , the second channel  1210 , the third channel  1222 , and the fourth channel  1224 , respectively. In such instances, the first channel  1208 , the second channel  1210 , the third channel  1222 , and the fourth channel  1224  may be void of bearings directly beneath the first port  1300  and the second port  1302 , respectively, thereby allowing the first fastener  900 ( 1 ) and the second fastener  900 ( 2 ) to couple to the second housing  812 . Given this design, the bearings may remain stationary within the first channel  1208 , the second channel  1210 , the third channel  1222 , and the fourth channel  1224  as the first housing  810  rotates. 
     The bearings within the first channel  1208 , the second channel  1210 , the third channel  1222 , and the fourth channel  1224  couple the first housing  810  and the second housing  812  together. That is, once the bearings are inserted into the first channel  1208 , the second channel  1210 , the third channel  1222 , and the fourth channel  1224 , the bearings prevent the separation of the first housing  810  and the second housing  812  (in the X-direction). More particularly, being as bearings are disposed within the first channel  1208  and the third channel  1222 , the bearings serve to prevent separation of the first housing  810  and the second housing  812 . Additionally, being as bearings are disposed within the second channel  1210  and the fourth channel  1224 , the bearings serve to prevent separation of the first housing  810  and the second housing  812 . In other words, during pressurizing of the rotating fitting  800 , a shear force is exerted on the bearings. However, being as the bearings engage with the first housing  810  and the second housing  812 , the bearings resist the shear force and separation of the first housing  810  and the second housing  812 . 
     In some instances, the threads at the proximal end  802  and the distal end  804  may come by way of threaded fittings coupled to the first housing  810  and/or the second housing  812 . For example, a first threaded fitting  1304  may couple (e.g., welded, press fit, etc.) to the first housing  810  (so as to represent a portion of the first housing  810 ). A second threaded fitting  1306  may couple (e.g., welded, press fit, etc.) to the second housing  812  (so as to represent a portion of the second housing  812 ). 
     The rotating fitting  800  therefore includes components for coupling the first housing  810  and the second housing  812 . The coupling may come by way of bearings that are disposed in channels of the first housing  810  and the second housing  812 , respectively. Moreover, the bearings permit rotation of the first housing  810  to provide rotational movement of the spray gun, for example, coupled to the first housing  810 . The gasket  1200  further seals the first housing  810  and the second housing  812  to prevent leakages. 
       FIG.  14    illustrates an assembled cross-sectional view of the rotating fitting  800 , taken along line B-B of  FIG.  10   . The first housing  810  is shown at least partially disposed within the second housing  812 . Moreover, as explained above with regard to  FIG.  13   , when the first housing  810  is placed within the second housing  812 , the first channel  1208  and the third channel  1222  form a first retention chamber  1400 . First bearings  1402 ( 1 ) reside within the first retention chamber  1400  and couple the first housing  810  and the second housing  812 . That is, the first bearings  1402 ( 1 ) resist longitudinal movement (X-direction) of the first housing  810  and the second housing  812  relative to one another. When the first housing  810  and the second housing  812  are coupled together, the first bearings  1402 ( 1 ) resist a shear force applied from the pressure experienced by the rotating fitting  800 . 
     Similarly, when the first housing  810  is placed within the second housing  812 , the second channel  1210  and the third channel  1222  form a second retention chamber  1404 . Second bearings  1402 ( 1 ) reside within the second retention chamber  1404  and couple the first housing  810  and the second housing  812 . The second bearings  1402 ( 1 ) resist longitudinal movement (X-direction) of the first housing  810  and the second housing  812  relative to one another. When the first housing  810  and the second housing  812  are coupled together, the first bearings  1402 ( 1 ) resist a shear force applied from the pressure experienced by the rotating fitting  800 . 
     In some instances, the first channel  1208  may receive substantially half of individual bearings of the first bearings  1402 ( 1 ), and the third channel  1222  may receive substantially half of the individual bearings of the first bearings  1402 ( 1 ). Additionally, the second channel  1210  may receive substantially half of individual bearings of the second bearings  1402 ( 2 ), and the fourth channel  1224  may receive substantially half of the individual bearings of the second bearings  1402 ( 2 ). However, the equal portions of the first bearings  1402 ( 1 ) need not reside in the first channel  1208  and the third channel  1222 , and/or equal portions of the second bearings  1402 ( 2 ) need not reside in the second channel  1210  and the fourth channel  1224 . In such instances, the first channel  1208  and the second channel  1210  may include a greater or lesser depth in the first body  1206  of the first housing  810 , and/or the third channel  1222  and the fourth channel  1224  may include a greater or lesser depth in the second body  1220  of the second housing  812 . For example, the first body  1206  may form greater than half of the first channel  1208  and/or the second channel  1210 , and/or the second body  1220  may form greater than half of the third channel  1222  and/or the fourth channel  1224 . 
     Additionally, although the first retention chamber  1400  and the second retention chamber  1404  are shown being circular in shape, other shapes are envisioned for accommodating differently shaped bearings (e.g., roller bearings, tapered bearings, etc.). As also shown, the first fastener  900 ( 1 ) is at least partially disposed within the first retention chamber  1400  (or a portion of the first channel  1208  and/or the third channel  1222 ), and the second fastener  900 ( 2 ) is at least partially disposed within the second retention chamber  1404  (or a portion of the second channel  1210  and/or the fourth channel  1224 ). Such design prevent the first bearings  1402 ( 1 ) and the second bearings  1402 ( 2 ) annularly rotating about the first retention chamber  1400  and the second retention chamber  1404 , respectively. 
     The gasket  1200  is shown disposed between the first housing  810  and the plug  1000 . The interior surface  1232  of the gasket  1200  engages with the flange  1212  of the first housing  810  and the flange  1230  of the plug  1000 . The exterior surface  1234  of the of the gasket  1200  engages with the interior surface  1218  of the second housing  812 . As the first housing  810  rotates, the gasket  1200  engages with the interior surface  1218  of the second housing  812  to provide a seal between the first housing  810  and the second housing  812 . In some instances, tightening the plug  1000  compresses the gasket  1200  against the interior surface  1218  of the second housing  812 . For example, as the plug  1000  is tightened, the gasket  1200  is compressed between the plug and the first housing  810 . This compression may result in the gasket  1200  applying a force against the interior surface  1218  of the second housing  812 . As the gasket  1200  experiences wear, the plug  1000  may be tightened to further secure the gasket  1200  and seal the gasket  1200  with the second housing  812 . For example, a hexagonal socket maybe placed through the distal end  804  of the rotating fitting  800  and engaged with the hexagonal head of the plug  1000 . 
     In some instances, edges or surfaces of the first housing  810  and/or the second housing  812  may be chamfered or rounded to prevent damage to the gasket  1200 . For example, as the gasket  1200  is inserted into the second housing  812 , edges of the first port  1300  and/or the second port  1302 , for example, may be chamfered to prevent damage to the gasket  1200 . After assembly, the first housing  810 , the second housing  812 , and the plug  1000  for the passage  814  of the rotating fitting  800 , between the proximal end  802  and the distal end  804 . 
     Although the proximal end  802  and the distal end  804  of the rotating fitting  800  are shown including certain receptacles for receiving the spray gun and supply line, respectively, the receptacles may be differently shaped than shown and/or attachments may couple to the proximal end  802  and the distal end  804 . For example, a 90 degree or 45 degree elbow may couple to the proximal end  802  and/or the distal end of the rotating fitting  800 . Additionally, although the rotating fitting  800  is shown including two retention chambers, the rotating fitting  800  may include more than or less than two retention chambers. The first retention chamber  1400  and the second retention chamber  1404 , may also be spaced apart from one another differently than shown (e.g., spaced closer to one another or spaced farther from one another). 
     The rotating fitting  800  therefore permits rotation of the first housing  810  inside the second housing  812 . Additionally, the first bearings  1402 ( 1 ) and the second bearings  1402 ( 2 ) engage with the first retention chamber  1400  and the second retention chamber  1404 , respectively, formed within the first housing  810  and the second housing  812 . The first bearings  1402 ( 1 ) and the second bearings  1402 ( 2 ) resist separation of the first housing  810  and the second housing  812  as the rotating fitting  800  experiences pressures associated with metal spray processes (e.g., between 400 PSI and 1200 PSI). Further, the first bearings  1402 ( 1 ) and the second bearings  1402 ( 2 ) provide rotational movement to the first housing  810 , which is coupled to a spray gun, for example, to reduce movement being imparted to a supply line coupled to the second housing  812 . 
     INDUSTRIAL APPLICATION 
     The present disclosure describes a rotating fitting that is capable of rotation movement without imparting rotational movement to a supply line. In some instances, the rotating fitting includes a first housing, and a second housing rotatably coupled to the first housing. For example, the first housing may include a first channel that forms a first portion of a retention chamber within which one or more bearings reside, and the second housing may include a second channel that forms a second portion of the retention chamber. By disposing bearings within the retention chamber, the bearings engage within the first channel and the second channel, thereby coupling the first housing and the second housing. Additionally, due to the diameters of the housings and the position of the bearings, the bearings prohibit separation of the first housing and the second housing. The bearings further provide rotational movement to the rotating fitting, between the first housing and the second housing, and without imparting motion to the supply line. This reduces wear and fatigue experienced by the supply line, leading to decreased costs to replace worn parts and/or downtime during manufacturing. 
     A gasket further seals the first housing and the second housing together to prevent the leakage of gases within the rotating fitting. The gasket may include a graphite material for accommodating the rotating nature of the rotating fitting. For example, as the first housing rotates within the second housing, the gasket may engage with an interior surface of the second housing. A plug engaged with the first housing compresses the gasket between the plug and the first housing. As the gasket experiences wear, for example, the plug may be tightened, thereby compressing the gasket, and reintroducing a seal between the first housing and the second housing. In other words, as the gasket experiences wear, the plug may be tightened to compress the gasket against the second housing and/or the plug may be removed to replace the gasket. By maintaining and/or replacing select components of the rotating fitting, as compared to discarding or replacing an entirety of the rotating fitting, the useful life of the rotating fittings described herein are extended. 
     While the foregoing invention is described with respect to the specific examples, the scope of the invention is not limited to these specific examples. Since other modifications and changes varied to fit particular operating requirements and environments will be apparent to those skilled in the art, the invention is not considered limited to the example chosen for purposes of disclosure, and covers all changes and modifications which do not constitute departures from the true spirit and scope of this invention. 
     Although the application describes embodiments having specific structural features and/or methodological acts, the claims are not necessarily limited to the specific features or acts described. Rather, the specific features and acts are merely illustrative some embodiments that fall within the scope of the claims of the application.