This invention relates to a hand held sprayer that delivers fluid with a solid stream or various patterns of multiple streams, comprising a controller, an extension bar, and a spray tip for multi-purpose usages. The controller incorporates a vertical shut-off valve to control the flow from a pressurized inlet source to the outlet, wherein the vertical shut-off valve enables the user to get instant access of fluid supply by manually regulating a pushbutton. A movable stem assembly is engaged with a seat in the valve, being urged in a closed position by the pressures relieved from a compression spring and the inlet fluid. A bottom cover that supports the compression spring is secured to a housing body with an O-ring to seal, and a top cover is adjustably placed to lock an O-ring for obtaining a sealing and an appropriate movement of the stem assembly.

BACKGROUND OF THE INVENTION 
   1. Field of Invention 
   This invention relates to a fluid spraying apparatus, and more particularly to a manually operable device having a vertical shut-off valve, engaging in spraying fluid for multiple purposes. 
   2. Description of Related Art 
   A variety of sprayers with various control valves have been issued for spraying fluid. Most of the hand sprayers are generally used to spray fluid in fine droplets with the use of a nozzle. The trigger of the sprayer activates and drives the fluid into the nozzle for spraying. In another device a pressurized container is attached to the sprayer to release the fluid. These types of sprayers do not supply enough fluid to use for hygienic purposes. 
   There is a spraying apparatus that provides a shower for a bath in which the body is sprayed with fine streams of fluid from a perforated nozzle. The nozzle has a large head with a cover plate containing small holes for spraying fluid. This large sized head of the apparatus becomes an impediment when it is used in the limited area passed through the narrow space. The spraying apparatus is generally not equipped with any shut-off valve on the body. These features are inconvenient whenever the instant fluid supply is necessary. 
   There are numerous shut-off valve systems available to supply fluid for frequent usages. Some systems contain complicated configurations, hindering manufacturers from their productions. Some systems are too delicate to endure high pressures delivered from the inlet source. Other systems include structures for specific purposes so that the users have difficulties to utilize for different purposes. For example, a sprayer for cleaning dishes in the kitchen has a shut-off valve equipped with a trigger handle near the head of the angled body. This feature is not convenient when the users need to supply fluid to a distant area with a remotely regulating method. The structure that the shut-off valve is built in an angled part of the body elevates the dimensions of the sprayer. The bulky type of sprayer does not fit for being placed into a limited space through a narrow opening. 
   This invention delivers fluid to any area for instant access. It delivers fluid to a near area as a handy sprayer. It delivers fluid to a distant area as a remote sprayer. The sprayer can be placed to a remote area through a limited space. The slim and lengthy body of the invention allows this placement possible. The easily separable components in a quick connection afford diversity of usages and the length is adjusted through a selective extension bar. The spraying pattern is accustomed through a chosen spray tip. Fluid can be supplied either with spouting in a single stream from the extension bar or with spraying in multiple streams from the spray tip. The single stream fluid has powerful pressures to do spot cleaning. The various spraying patterns add flexibility and convenience for a multi-purpose sprayer. 
   The vertical shut-off valve in the invention enables the user to use the sprayer at any time. The durable structure of the valve is designed to endure high pressures from the inlet fluid source. The configuration of the valve system overcomes a common problem of leakage under the high pressures. The unsophisticated valve assembly gives benefits to the user for maintenance. All the components can be made of plastics for lower cost or metals to achieve durability. The arrangement of the shut-off valve can be applied to any apparatus for requiring instant access of fluid or any other types of fluid in the industry. 
   SUMMARY OF THE INVENTION 
   The multi-purpose hand held sprayer comprises a controller incorporating a vertical shut-off valve, an extension bar, and a spray tip. The external body of the sprayer takes a longitudinal and slim shape for facilitating placement in limited space through a narrow opening. The contour of the sprayer is deliberated to place the sprayer in a holder with little efforts. The controller has an inlet coupler to connect to a pressurized fluid source. The outlet of the controller has an adapter for a quick connection to the extension bar, obtaining a single solid stream of fluid spouted. The extension bar is additionally utilized for the quick connection to an adapter of a spray tip to get various patterns of spray. All the adapters at the joint areas have multiple sizes of diameters and require O-rings for sealing and friction. The quick connection for coupling two components enables a quick assembly and rotation for the multi-purpose usages. A variety of extension bars and spray tips are selected to fit to the individual requirements. 
   The vertical shut-off valve in the controller has a housing and a pushbutton for regulating the fluid flow. The housing comprises an upper chamber and a lower chamber divided by a seat. An inlet is located in the lower chamber, leading to the inlet coupler of the controller to receive pressurized fluid. An outlet in the upper chamber contains fluid released from the lower chamber, which is directed to the outlet of the controller. The upper chamber and the lower chamber embrace a manually movable stem assembly for a valve function. 
   The stem assembly is engaged with a seat by the pressures released from a compression spring and the pressurized inlet fluid. The pressures urge the stem assembly into the closing position against the seat. The stem assembly is composed of an elastic O-ring placed between an upper member and a base plate secured by a fastener. The O-ring has an exposed area from surrounding grooves of the upper member and the base plate. The width of the exposed area is for engagement with the seat and should be less than the thickness of the O-ring to keep in the place. The seat is located in between the upper chamber and the lower chamber, secured to the housing with an elastic O-ring for sealing. The lower chamber has a bottom cover secured to the housing with an O-ring. The bottom cover has a slot for placing the compression spring to urge the stem assembly. The upper chamber has a channel connected to an opening located above. The opening is threadably secured with a top cover that has a hole in the middle. The top cover applies pressures on an elastic O-ring located underneath. The pressures are adjusted to get an optimum sealing and friction of the stem assembly against the O-ring. The channel on the upper chamber and the hole on the top cover allow the upper member of the stem assembly to be passed through to join a pushbutton assembly. The pushbutton is manually depressed to open the stem assembly to release the fluid. The body of the pushbutton is secured with a locknut, wherein the locknut is located in an opening that is covered with a finish plug. 


   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a prospective view of the invention showing the multi-purpose hand held sprayer having a vertical shut-off valve. 
       FIG. 2  is a sectional view taken on the line  1 — 1  in  FIG. 1  displaying the internal passage from the inlet to the outlet. 
       FIG. 3  is an exploded view of  FIG. 1 , wherein a controller, an extension bar, and a spray tip—these three components are disassembled, showing the joining elements for a quick connection. 
       FIG. 4  is a prospective view of a vertical shut-off valve isolated from the controller in  FIG. 3  showing a profile of outer elements. 
       FIG. 5  is a prospective view of the sprayer, wherein the controller is connected to the extension bar having a single solid stream spouted. 
       FIG. 6  is a prospective view of the sprayer, wherein the controller in  FIG. 5  is furthermore connected to an angled spray tip having a multiple streams of fluid. 
       FIG. 7  is an exploded view of the vertical shut-off valve in  FIG. 4  made in accordance with the present invention. 
       FIG. 8  is a cross-sectional view of a housing body of the vertical shut-off valve taken on the line  7 — 7  in  FIG. 7  without the internal components assembled. 
       FIG. 9  is a cross-sectional view of  FIG. 8  with the internal components assembled. 
       FIG. 10  is a prospective view of a stem assembly wherein an O-ring is placed between an upper member and a base plate secured by a fastener. 
       FIG. 11  is a cross-sectional view of the stem assembly taken on the line  10 — 10  in  FIG. 10  showing the internal structure of assembled components. 
       FIG. 11A  is a fragmentary enlargement of  FIG. 11  showing details of O-ring, wherein the O-ring is mostly enclosed in the grooves of an upper member and a base plate, and is partially exposed for engagement with a seat. 
       FIG. 12  is a cross-sectional view of the vertical shut-off valve taken on the line  44  in  FIG. 4  showing the valve in a closed position with a pushbutton being freestanding. 
       FIG. 13  is a cross-sectional view of the vertical shut-off valve taken on the line  4 — 4  in  FIG. 4  showing the valve in an open position with a pushbutton being depressed by the external force P. 
   


   DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Reference is now made in detail to the present invention, examples of which are illustrated in the accompanying drawings wherein reference numerals having the same first two digits indicate related elements, such as  10  and  101 . The numerals having the same first three digits indicate same components with different elements, such as  101  and  1017 . General structures of the invention will be described following by the details and the function of components. Referring to  FIG. 1 , a prospective view of the present invention, a multi-purpose hand held sprayer having a vertical shut-off valve, or namely a “sprayer”, is shown as an assembled one and indicated by the number  10 . The sprayer  10  is composed of a controller  101  incorporating a vertical shut-off valve  20 , an extension bar  103 , and a spray tip  105 . The exterior of the body takes a slim and sleek shape for the purpose of placing in a remote area through a limited space. 
   The sprayer  10  in  FIG. 2  shows internal structures of the components connected each other. The exploded view of  FIG. 3  shows the individual components of  FIG. 1  that are separated apart. An inlet  1015  of the controller  101  in  FIG. 2  is leading to an outlet channel  1013  through a vertical shut-off valve  20 , or namely a “valve”. The valve  20  controls the fluid from the inlet  1015  flowing to the outlet channel  1013  of the body  1017 . The outlet channel  1013  in  FIG. 2  of the controller  101  has a female outlet  10112  in  FIG. 3  at the end. The female outlet  10132  in  FIG. 3  has two staged internal diameters  1011 , 1012  in  FIG. 2  for connection to the extension bar  103 . The female outlet  10132  is coupled with a male inlet  10351  of the extension bar  103  using a quick connection. The male inlet  10351  of the extension bar  103  has two staged diameters  1031 , 1032  for coupling to the female outlet  10132  of controller  101  as shown in  FIG. 2 . The O-rings  1033  are placed in the grooves of the male adapter to offer sealing and friction in the joining area. A male outlet  10352  of the extension bar  103  also has two staged external diameters  1036 ,  1037  for coupling to a spray tip  105  as in  FIG. 3 . It has O-rings  1038  placed in the grooves to offer sealing and friction in the joining area as the male inlet  1035  does. The male outlet  10352  is then coupled with a female inlet  10561  of the spray tip  105  using the same quick connection. The female inlet  10561  of the spray tip  105  also has two staged diameters  1056 , 1057  for coupling to the male outlet  10352  of the extension bar  103 . A chamber  1059  in  FIG. 2  is placed in the inlet of spray tip  105  after the outlet of extension bar  103 . This chamber is a small reservoir buffering two joining channels that are not aligned each other. The spray tip  105  contains a plug  1051  that has multiple small openings  1052  for spraying fluid in the air. The plug  1051  is secured into the body  1053  of the spray tip  105  with an O-ring  1058  on the internal base to seal. 
   The components of the sprayer  10  are coupled using a quick connection. The quick connection defines that one male adapter is placed into the other female opening with sliding motion. The multiple staged male adapter supports easier and better connection than the single staged adapter to the female opening, because the male adapter with a smaller diameter serves as a guide for speedy coupling. The quick connection affords a fast and easy attachment of two components. It also affords ability for spinning of the components while attached, aligning them in various positions. Multiple elastic O-rings with various sizes of thickness support to seal the linkage and to adjust friction for the connection. The low pressures in the outlet channels enable this type of quick connection that requires less tightening stress. However, the coupling of two components can be done using any other joining technique such as a threading method. The male outlet and the female inlet for coupling can be changeable using opposite sex such as the female outlet and male inlet. 
   The prospective view of the controller  101  in  FIG. 3  comprises a controller body  1017 , an inlet  1015  with an inlet coupler  1016  for connecting to a pressurized fluid source, an outlet  10112  for released fluid, a contour  1013  for placing in a holder, and a vertical shut-off valve  20  incorporated into the controller body  1017 . The valve  20  regulates the fluid flowing from an inlet  1015  to the outlet  10112 . The isolated valve  20  shown in  FIG. 4  will be later described in greater details. 
   The extension bar  103  in  FIG. 3  is comprises a body  1034  with a contour  1039  for placing in a holder, a male inlet  10321 , and a male outlet  10372 . The male inlet  10321  and the male outlet  10372  contain a double staged adapter-one with smaller diameter  1032  and the other with larger diameter  1031 -at each end. The double staged adapter has grooves for O-rings  1033  furnished for sealing and a quick connection. The male inlet  10351  of the extension bar  103  is connected to the female outlet  10112  of the controller  101  to receive expelled fluid from the valve  20 . The extension bar  103 , as shown in  FIG. 5 , carries the fluid to its outlet  10372  spouting a solid stream  10375  at the end. The pressures of solid stream can be adjusted through the valve control. Its maximum pressures with full opening of the valve  20  can be utilized for spot cleaning or quantity supplying. The extension bar takes a variety of length and shape for individual preference. The body with slim and long shape can be reached to a remote area and placed in a limited space. 
   The male outlet  10372  of the extension bar  103  in  FIG. 3  is furthermore connected to the female inlet  10561  of the spray tip  105  for multiple fluid streams  10525  in the air, as shown in  FIG. 6 . The spray tip  105  has a plug  1051  that contains small multiple openings  1052 . The various patterns of spraying streams from the spray tip  105  can be achieved by changing the plug  1051  that holds a variety of openings with different sizes. The body  1053  in  FIG. 3  of the spray tip  105  can be curved at an angle as shown in  FIG. 6  to achieve a certain degree of spray in the air for various purposes. The spray tip  105  can take a body forming slim and sleek exterior for being placed into a limited space. 
   The vertical shut-off valve  20  is shown in  FIG. 4  with being isolated from the body  1017  of the controller  101  in  FIG. 3 . The valve  20  comprises a pushbutton assembly  30  for manual operation and a housing  45  for controlling the flow. The exterior of the housing  45  includes a top cover  40 , a bottom cover  90 , an inlet opening  528 , and an outlet opening  519  as shown in  FIG. 4 . All the components of the valve  20  are shown in  FIG. 7  as an exploded view made in accordance with the present invention. 
   The housing  45  of the valve  20  in  FIG. 7  has a housing body  50  in  FIG. 8  that contains an internal structure for vertically movable valve function, creating a vertical shut-off valve. The vertical shut-off valve simplifies the valve structure to yield benefits for production and consumption. It facilitates the valve operation, because the vertical motion of the valve control is aligned with a manual depression movement. It may adopt a trigger handle that implements a leverage to gain valve operation force. The body  50  in  FIG. 8  has two chambers—an upper chamber  51  and a lower chamber  52 —divided by a threaded neck  55  in the middle. The upper chamber  51  is located on the top of the threaded neck  55 , containing a small outlet opening  519 , which is leading to the outlet  10112  of the controller  101  in  FIG. 3 . A large opening  513  in  FIG. 8  above the upper chamber  51  has a thread  515  for placing a top cover  40  in  FIG. 7 . A hollow  517  in  FIG. 8  is located on the bottom of the opening  513  for placing an O-ring  48  in  FIG. 7  to seal. The hollow  517  makes a limitation for the O-ring  48  to get deformed toward the outside when the pressures are applied on. Therefore, the deformation of the O-ring is made toward the center, affording better sealing around an upper member  71  of stem assembly  70  in  FIG. 7 . A channel  511  in  FIG. 8  is placed for communicating between the upper chamber  51  and the large opening  513 . This channel is for placing an upper member  71  in  FIG. 10  of a stem assembly  70  to control the valve. The lower chamber  52  in  FIG. 8  is located on the bottom of the threaded neck  55 . It contains an inlet opening  528  leading to the inlet  1015  in  FIG. 3  of controller  101 . A thread  525  is located for placing the bottom cover  90  in  FIG. 7  to seal the lower chamber. 
   The body  50  of the housing  45  in  FIG. 7  can be separately built as a sole item. Then, it can be inserted into the body  1017  of the controller  101  to become consolidated as shown in  FIG. 3 . However, the body  50  of the housing  45  in  FIG. 7  can be infused to the body  1017  of the controller  101 , forming a single composition. The infused embodiment structure has the internal vertical shut-off valve system built directly into the body  1017  of the controller  101 . This solitary formation into a plastic made body reduces a manufacturing cost and simplifying the assembly process. However, it holds less durability than the separate metal housing incorporated into the plastic made body. A variety of production can be possible using a mixture of different material, structure, and design without departing the scope of protection. 
   A seat  60  in  FIG. 7  has an opening  601  in the middle wherein an upper member  71  of the stem assembly  70  and the released fluid are passed through. It is assembled to the housing  50  with an O-ring  68  to seal as shown in  FIG. 9 . The opening  601  of the seat  60  in  FIG. 9  has two different sizes of diameters aligned: one with a small diameter  604  and the other with a large one  605 . The small opening  604  takes a polygon shape to make it easy to assemble and disassemble using a tool. The large opening  605  in  FIG. 9  takes a round shape for placing a flange  716  in  FIG. 10  of the upper member  71 . The outer surface of the seat  60  has a mean for fastening to the housing  50  such as thread  607  as shown in  FIG. 9 . An outer flange  603  in  FIG. 9  is located next to the thread  607  to apply pressures onto an O-ring  68  to seal. A lip  602  in  FIG. 9  of the seat  60  takes a rounded surface for easy engagement with an O-ring  78  in  FIG. 11  of a stem assembly  70  to control fluid flowing through the opening  601 . The opening  601  in  FIG. 9  of the seat  60  is a channel for the pressured fluid at the inlet  528  to be discharged from the lower chamber  52  to the upper chamber  51 , and for the upper member  71  of the stem assembly  70  to be passed through. 
   The stem assembly  70  in  FIG. 7  is composed of an upper member  71 , an O-ring  78 , a base plate  80 , and a securing fastener  89 . All of these components are assembled together, working as one distinctive piece as shown in  FIG. 10 . The upper piece  71  in  FIG. 10  of stem assembly  70  comprises a flange  716 , a shank  715 , a shoulder  713 , and a thread  712 . The flange  716  supports an O-ring  78  in the groove  719  in  FIG. 11A  to keep in the place. This flange  716  furthermore guides and stabilizes a movement of the stem assembly  70  in the large opening  605  of the seat  60  in  FIG. 9 . Its round shape allows the stem assembly  70  to be placed into the large opening  605  of the seat  60  with any direction. The shank  715  in  FIG. 10  extends its length to the outside of the valve housing  45  as shown in  FIG. 4 . Its smooth and round surface contributes good sealing with an O-ring  48  in  FIG. 9  in the contact area. The shoulder  713  in  FIG. 10  is for placing a pushbutton  30  in  FIG. 7 . The thread  712  in  FIG. 10  is for a nut  304  in  FIG. 7  to lock the pushbutton  30 . The O-ring  78  in  FIG. 7  is located under the flange  716  in  FIG. 10  to stop flow of fluid when it is in engagement with the seat  60  in  FIG. 9 . Its round shape of thickness affords a good sealing with the round shape of lip  602  of the seat  60  in  FIG. 9 . The base plate  80  in  FIG. 7  is located under the flange  716  in  FIG. 10  to keep the O-ring  78  in the place. A groove  802  in  FIG. 11  on the base plate  80  is made for better securing the O-ring  78 . A bulging element  805  in  FIG. 11  of the base plate  80  is for holding a compression spring  96  in  FIG. 7  in the place. The base plate  80  in  FIG. 11  has a large surface area  803  for absorbing the pressures from the inlet fluid source. The surface area  803  is adjustable to regulate the force for operation. The absorbed pressures are then released to add to the compression spring force, biasing the shut-off valve in the closed position. 
   The O-ring  78  in  FIG. 7  becomes deformed or displaced because of the pressures delivered from the pressurized inlet fluid and the compression spring  96 , reducing its performance. To ease this problem, the groove  719  in  FIG. 11A  on the flange  716  and the groove  802  on the body  803  of the base plate  803  are implemented and their surround shapes are to be rounded to enclose the O-ring  78 . These rounded shapes of grooves  719 ,  802  afford the maximum supportive areas to the O-ring  78 . Therefore, the pressures are distributed over the maximum supportive areas, minimizing the deformation of the O-ring  78 . Besides, the exposed width W of the O-ring  78  in  FIG. 11A  should be smaller than the thickness D to prevent its displacement. As shown in  FIG. 11A , if the exposed width is nominated W and the thickness is nominated D, then the relations between W and D are formulated as the following:
 
W<D
 
to keep the O-ring  78  in the place for the proper function of the stem assembly  70 .
 
   The difference between the exposed width W and thickness D of the O-ring  78  determines stability of the O-ring  78  placed in the grooves  719 ,  802  in  FIG. 11A . However, the meaning of this absolute value of difference is less meaningful because it differs from the small thickness to the large thickness of the O-ring  78 . Therefore, the difference ratio has more meaningful as a relative value based on the thickness of the O-ring  789 , and it formulates as the follows:
 
Relative Difference Ratio=( D−W )/ D 
 
The bigger the difference ratio is, the more stable the O-ring is in the place without displacement. However, there are some more factors that affect the optimum difference ratio. One of the factors is that the exposed width W requires a minimum contact surface area with the seat  60  for a proper engagement. Another factor is the material of the O-ring that is made of. The softer material that the O-ring  78  is made of, the bigger the difference ratio should be placed to prevent the displacement of the O-ring  78 .
 
   A compression spring  96  in  FIG. 7  is located in a slot of a bottom cover  90  as shown in  FIG. 9 . Its compression pressures in addition with the inlet fluid pressures urge the stem assembly  70  in the closed position. It should be made of a corrosion resistive material or be wrapped by elastic rubber because it is always in submerge state. The bottom cover  90  in  FIG. 7  is placed for securing the lower chamber  52  in  FIG. 8  and for supporting the compression spring  96  as shown in  FIG. 9 . A slot  904  of the bottom cover in  FIG. 9  is for placing the compression spring  96  to prevent its dislocation. An O-ring  98  in  FIG. 7  is placed to seal leakage from the lower chamber  52  through coupling area of the housing body  50  and the bottom cover  90  as shown in  FIG. 9 . 
   The top cover  40  in  FIG. 7  above the housing  45  supports the stem assembly  70  for its movement through the opening  401 . The top cover  40  in  FIG. 9  has a male thread  405  to be assembled to the female thread  515  in  FIG. 8  of the housing body  50 . It also has a groove  43  underside as shown in  FIG. 9  for placing an O-ring  48 . The O-ring  48  seals the gap between the shaft  715  of the stem assembly  70  in  FIG. 10  and the opening  401  in  FIG. 9  of the top cover  40 . The O-ring  48  seals its surrounding threaded area as well, as shown in  FIG. 9 . When the top cover  40  is tightened to cause the O-ring  48  to become deformation by the pressure, the hollow  43  in  FIG. 9  on the top cover  40  together with the hollow  517  in  FIG. 8  on the body  50  restrain the deformation of the O-ring  48  toward the outside. Therefore, these hollows  517 ,  43  are supporting to afford more pressures toward the shaft  715  within, affording better seal around. The pressures applied on the O-ring  48  should be adjustable with tightening motion of the top cover  40  in  FIG. 9 . The optimum amounts of pressures ensure the proper movement of the stem assembly  70  in  FIG. 10  and leakage proof around the shaft  715  together with the thread  405  of the top cover  40 . If the amounts of pressures are too high, the high pressures contribute a good sealing around the shaft  715  but cause a hard movement of the stem assembly  70  for operation. If the amounts of pressures are too low, the low pressures afford a soft movement of the stem assembly  70  but cause a poor sealing around the shaft  715 . 
   The pushbutton assembly  30  in  FIG. 7  comprises of a body  302 , a lock nut  304 , and a finish plug  306 . The body  302  in  FIG. 7  has a hole  308  in  FIG. 12  for the shoulder  713  in  FIG. 11  of the stem assembly  70  to place in. It has a large opening  307  in  FIG. 12  to place the lock nut  304  on the male thread  712  in  FIG. 11  of stem assembly  70 . The lock nut  304  in  FIG. 12  combines the stem assembly  70  to the body  302  of the pushbutton assembly  30  for manual operation. The body  302  of the pushbutton assembly  30  takes any shapes and colors for style and performance. However, the pressure-applied area of the body  302  should be large enough to offer comfortable operation of the stem assembly by the user. A groove  309  in  FIG. 12  in the opening  307  is for securing the finish plug  306  that covers up the lock nut  304  and the opening  307 . The lock nut  304  is preferably a nylon inserted locknut to resist its loosening from rotational movement of the stem assembly  70 . The finish plug  306  is snapped in the opening  307  in such a way that its legs  3061  are secured in the groove  309  of the body  302 . This finish plug  306  can be threadably attached to get the same purpose. The finish plug  306  that the actuating pressures are applied on requires the strength that the structure and the material should endure when operating the valve. 
   When the user does not apply any pressures on the pushbutton assembly  30  in  FIG. 12 , the O-ring  78  of the stem assembly  70  is in engagement with the lip  602  of the seat  60 , showing that there is no communication between the upper chamber  51  and the lower chamber  52 . The spring  96  on the bottom cover  90  and the pressurized fluid  5282  in the lower chamber  52  are urging the stem assembly  70  against the lip  602  of the seat  602  to prevent the inlet flow  5281  toward the outlet  519  as shown in  FIG. 12 . However, when the user applies the pressures P in  FIG. 13  on the pushbutton assembly  30 , the stem assembly  70  gets lowered to make a passage  529  between the lip  602  of the seat  60  and the O-ring  78  of the stem assembly  70 . The passage  529  allows the pressurized inlet fluid  5281  in the lower chamber  52  flowing through the opening  601  of the seat  60  to the upper chamber  51 , releasing fluid  5191  through the outlet  519  as shown in  FIG. 13 . The released fluid  5191  includes low pressures, which enable the user to apply the quick connection for coupling of two components.