Abstract:
A valve assembly is provided. The valve assembly includes a valve housing and a harbor provided at a lower portion of the valve housing. The valve housing has an internal bore for receiving a valve control cartridge, and the harbor has a first recess suitable for receiving a water supply tube, and a second recess suitable for receiving a second water tube, wherein the harbor also has a slot. The valve assembly further includes the water supply tube mounted in the first recess, the second water tube mounted in the second recess, and a retainer clip positioned in the slot with that clip simultaneously engaging both tubes. The retainer clip comprises a first leg and a second leg connected by a waist to define there between a retaining area, and at least the first leg has formed thereon a notch adjacent a heel of the leg.

Description:
CROSS-REFERENCE TO RELATED PATENT APPLICATIONS 
     This application is a Divisional of U.S. application Ser. No. 12/358,696, filed Jan. 23, 2009, which claims priority from U.S. Provisional Application 61/023,917, filed Jan. 28, 2008, both of which are incorporated herein by reference in their entireties. 
    
    
     STATEMENT OF FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     Not applicable. 
     BACKGROUND 
     The present invention relates to valve assemblies having improved disk, bonnet, and hose attachment features. 
     A variety of fluid control valves are known. One type of fluid control valve is a rotational, non-rise valve. This type of valve is commonly used to control a flow of a single particular fluid, such as a hot or cold water supply, to a faucet, spout, or other plumbing fitting. Some such valves have a handle that drives a rotatable valve stem, with the stem in turn rotating an apertured disk over an apertured stationary disk, to control the flow of a fluid up from the bottom of a valve cartridge and out the side. This type of valve is commonly used in a “widespread” arrangement where one such valve is positioned about six inches to the right of a spout, another such valve is positioned about six inches to the left of a spout, and the linkages between the valves and the spout are below a countertop or the like. 
     While such valves have many desirable features, there is still room for improvement. For example, the flow path of some such valves brings the water into substantial contact with a brass housing. Because many conventional brasses contain some lead, and because long term use of such valves has therefore raised some regulatory concerns about contact of potable water with leaded brass, it is desirable to find ways of configuring such valves to minimize contact between the potable water and leaded brass housings. 
     In some approaches to address this problem suppliers have attempted to remove lead from their housing brasses (e.g. by substituting bismuth for the lead). However, this can add cost and/or make machinability more complex when forming the housing. 
     Another approach is to link plastic or copper tubing to the valve, and place the tubing inside an outer housing, to minimize the time that the potable water is in contact with the leaded brass. However, this may still leave considerable contact between the valve housing and the potable water, particularly in widespread configurations. 
     There have been some attempts to redirect flow downward rather than sideways in connection with mixing valves. For example, in the valve disclosed in U.S. Pat. No. 5,417,242 a movable disk redirects mixed water downward, rather than sideways. This is not in connection with a single flow control valve, and in any event still requires substantial contact between the valve housing and potable water. 
     Further, conventional single control valve configurations often rely on multiple O-ring seals or other techniques to avoid leakage out of the valve. See e.g. U.S. Pat. No. 4,651,770. Given that such valves can be expected to be used for decades once installed, there is an interest in reducing the number of such O-rings needed, and the incidence of needed maintenance relating thereto. 
     Moreover, there is a continued interest in reducing the complexity of assembling such valves, to lower cost relating thereto. A particular area of interest is how to reduce the labor costs relating to assembling the water supply and/or outlet connections to the valve cartridge, without compromising reliability of the connection. 
     Another area of such valves where there is a desire for improvement relates to optimizing the level of rotational resistance to control handle movement while supporting the rotational stem against wobble. Without some amount of resistance when turning a valve, it may appear to a consumer that the valve is broken or improperly functioning. Too much resistance can make the valve undesirable insofar as use by persons who have arthritis or otherwise are unable comfortably supply the needed force. Further, whatever solution is developed must impede excess amounts of wobble when the handle forces reach the rotational stem. 
     In some prior art configurations, tightening an outer bonnet too much or too little can impact on the appreciated resistance. Even where the resistance is determined in other ways, manufacturing variability can lead to undesirable variations in perceived resistance. 
     Hence, a need exists for improvements in these areas with respect to valve assemblies. 
     SUMMARY 
     In one aspect the present invention provides a valve assembly suitable to control the flow of a first fluid supply (e.g. hot or cold water), but not more than one fluid supply. Hence, this embodiment relates to single control valves, rather than mixing valves. 
     There is a valve housing having an internal bore, wherein both an inlet port and an outlet port extend between the internal bore and an exterior of the valve housing. A valve cartridge is positioned in the internal bore to control the volume of fluid flow from the inlet port to the outlet port. 
     The valve cartridge has a stationary disk positioned over both the inlet port and the outlet port, wherein the stationary disk has an inlet aperture and an outlet aperture. There is a movable disk positioned over the stationary disk and having a cavity on its bottom side. Also, a rotatable valve stem is operationally linked to the movable disk such that rotation of the valve stem can cause rotation of the movable disk over the stationary disk, with the movable disk as a result moving between a first position that prevents fluid flow between the inlet port and the outlet port, and a second position where fluid flow from the inlet port is permitted to pass up through the inlet aperture, through a portion of the cavity, down through the outlet aperture and into the outlet port. 
     Hence, there is provided a single control non-rise valve that reverses the flow of water downward rather than sideways out in contact with the valve housing. This permits the outflow flow to occur with reduced contact with a leaded brass housing or the like. 
     In preferred forms both the stationary disk and the movable disk are ceramic disks, the cavity has a partition wall, and an upper portion of the cavity is concavely contoured along a side of the partition wall to facilitate fluid flow between the inlet aperture and the outlet aperture when the partition wall is rotationally positioned so as not to prevent such flow. Also, both the inlet aperture and the outlet aperture can be essentially D-shaped in top view, in a back-to-back alignment, while a variety of other shapes can also be selected. 
     In some embodiments one can have the valve cartridge be at least in part retained in the valve housing by a bonnet nut threaded to an internal wall of the valve housing, where an internal channel of the bonnet nut is provided with means for controlling a level of resistance to rotation of stem. 
     Also, in varied embodiments there can be a harbor at a lower end of the valve housing that has a first recess for receiving a water supply tube, and a second recess for receiving a water outlet tube. The harbor also has a slot for receiving a retainer clip, and the assembly also includes a retainer clip positioned in the slot with that clip engaging both tubes to retain both. 
     In another aspect the invention provides a valve assembly. It includes a valve housing having an internal bore for receiving a valve control cartridge, and a harbor provided at a lower portion of the valve housing that has a first recess suitable for receiving a water supply tube, and a second recess suitable for receiving a second water tube, wherein the harbor also has a slot. 
     There is also a water supply tube mounted in the first recess, a second water tube mounted in the second recess, and a retainer clip positioned in the slot with that clip simultaneously engaging both tubes. For example, both tubes may have an annular groove suitable for receiving the retaining clip, and an O-ring seal positioned in one of the recesses. 
     In an especially preferred form the retaining clip is a substantially flat u-shaped clip. For example, there can be a U-shaped clip having a first leg and a second leg connected by a waist to define there between a retaining area. Both the first leg and the second leg can have formed thereon a notch adjacent a heel of the leg (which catches onto the tubes). In this aspect of the invention there is provided an easy way to simultaneously attach multiple water tubes (e.g. an inlet line and an outlet line), regardless of whether the valve is a single control valve or a mixing valve. 
     In yet another aspect of the invention there is provided a valve housing having an internal, generally cup-shaped bore. A valve control cartridge is inserted into the bore and has a rotatable control stem extending upwardly there from. There is also a bonnet nut threaded to an internal wall of the valve housing, the bonnet nut having a through channel that surrounds the control stem. 
     Means are provided along the through channel to control a level of resistance to rotation of stem. For example, this means may be selected from the group consisting of flexible fingers, bearing sleeves, lubrication pockets, and coatings, in each case where the stem is positioned to rub against the means as the stem is rotated. Alternatively, the means may be a glass-filled polymer surface of the bonnet nut positioned in contact with the stem to frictionally engage the stem. This aspect of the invention focuses on how a rotatable control stem may be frictionally controlled, regardless of the nature of the other valve components, or how tubing is attached to the valve. 
     Hence, the present invention, in various embodiments, provides a variety of advantages. First, it can be used to reduce the contact between the potable water and a valve housing possibly made of a leaded material. Next, it reduces labor costs by facilitating attachment of multiple fluid lines to the valve housing simultaneously. Also, it provides excellent support to the rotatable stem to reduce undesired handle wobble while providing careful control of the perceived frictional resistance to stem rotation. 
     These and still other advantages of the present invention will be apparent from the description below and the accompanying drawings. While preferred embodiments are described and depicted, it should be understood that this disclosure is by way of example. Hence, the claims should be looked to in order to judge the full scope of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a front plan view of a valve assembly of the present invention; 
         FIG. 2  is an exploded perspective view of an upper portion of that valve assembly; 
         FIG. 3  is an exploded perspective view of certain components of the valve assembly; 
         FIG. 4  is an exploded perspective view of a lower portion of that valve assembly; 
         FIG. 5  is a lower perspective view of a stationary disk of the valve assembly; 
         FIG. 5A  is a lower perspective view of an alternate form of the stationary disk; 
         FIG. 6  is a bottom plan view of that stationary disk; 
         FIG. 7  is a sectional view taken through lines  7 - 7  of  FIG. 6 ; 
         FIG. 8  is a bottom plan view of that stationary disk, with a lower valve seal mounted thereon; 
         FIG. 9  is a lower perspective view of a moveable disk of the present invention; 
         FIG. 9A  is a lower perspective view of an alternate form of the moveable disk for use with the stationary disk in  FIG. 5A ; 
         FIG. 10  is a top plan view of the moveable disk; 
         FIG. 11  is a cross-sectional view taken along line  11 - 11  of  FIG. 10 ; 
         FIG. 12  is a cross-sectional view taken along line  12 - 12  of  FIG. 10 ; 
         FIG. 13  is an enlarged perspective view of a bonnet nut of the valve assembly; 
         FIG. 14  is a cross-sectional view taken along line  14 - 14  of  FIG. 13 ; and 
         FIG. 15  is a cross-sectional view of the valve assembly of  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION 
     Referring first to  FIG. 1 , a valve assembly  10  is shown oriented along a longitudinal axis A. A valve stem  12  extends out from a bonnet nut  14  that is threaded into the valve housing  16 . The valve housing  16  has a pair of retaining segments  20  defining a harbor slot there between. Also, there may optionally be a flange  22  near the top of the valve housing  16 . As will be understood from  FIG. 4 , there can be a hose clip  24  inserted into the harbor slot which holds a fluid inlet hose  26  and a fluid outlet hose  28  in recesses of the valve housing  16  by engaging the slot and the hoses  26  and  28 . 
     Referring next to  FIG. 2 , there is shown a valve cartridge  30  inserted into an internal bore  32  of the valve housing  16  and retained in the valve housing  16  by the bonnet nut  14 . The valve cartridge  30  includes valve stem  12  which protrudes out. There can be tabs  36  that rotationally align and fix the valve cartridge housing  34  in relation to appropriate structures in the internal bore  32 . 
     Once the valve cartridge  30  is inserted into the bore  32 , the bonnet nut  14  is threaded into corresponding threads along the internal bore to secure the valve cartridge  30  in the bore  32 . Note in  FIG. 13  exterior threads  38  which engage with the interior threads  40  as shown in  FIG. 2 . In some embodiments, the bonnet could instead be connected using bayonet mounting. 
     Referring now to  FIG. 3 , the valve cartridge housing  34  retains a number of components including a glide washer  42 , an o-ring  44 , the valve stem  12 , a disk adapter  46 , a moveable disk  48 , a stationary disk  50 , and a lower valve seal  52 . The washer  42  and o-ring  44  seal the interface between the top of the valve cartridge housing  34  and the valve stem  12 . 
     The o-ring  44  may be inserted into one of the grooves  54  on the valve stem  12 . The valve stem  12  has the usual splined end  56  adapted for attachment to a control handle (not shown). The valve stem  12  also includes a transverse tab  58  which can be used to restrict the range of rotation of the valve stem  12  within the valve cartridge housing  34  by placing appropriate structures along the internal bore. 
     The valve stem  12  also has a bar-like drive foot  60  which can be inserted into one of a cross-shaped pair of slots on the mating face of the disk adapter  46 , depending on whether right hand or left hand rotation is desired. The drive foot  60  rotatably drives the disk adapter  46  as the valve stem  12  is rotated. An axially extending notch  62  at a point along the circumference of the disk adapter  46  may be used to properly align the adaptor and identify such alignment. 
     The disk adapter  46  also has a pair of axially downwardly extending tabs  64  that can be inserted into tab cutouts  66  on of the moveable disk  48  to permit the adaptor to rotatably drive the moveable disk  48 . Importantly, the moveable disk  48  has a pair of recesses  68  separated by a partition wall  70  on its lower face  71 . The face  71  of the moveable disk  48  is placed flush in contact with the stationary disk  50 . 
     The stationary disk  50  has a pair of apertures  72  extending from face  73  to a lower face  76 . These are defined by a wall  74 , such that they appear back-to-back D-shaped. The stationary disk  50  also has a pair of tabs  75  to rotationally fix the stationary disk  50  in the valve cartridge  30  by inserting the tabs  75  into stops in the valve cartridge. A lower valve seal  52  may be inserted into a recessed groove  77  on the lower face  76  of the stationary disk  50 . 
     It should be appreciated that the disk adapter  46  might be eliminated by projecting the stem directly into the movable disk (e.g. if the control stem of the valve assembly  10  consistently needs to be turned in one direction to open the valve). 
     Referring next to  FIG. 4 , it can be observed how the fluid inlet hose  26  and the fluid outlet hose  28  are preferably connected to the valve housing  16 . The fluid inlet hose  26  has an attachment end  78  having an annular recess  80 , and the fluid outlet hose  28  has an attachment end  82  having an annular recess  84 . In addition, appropriate grooves can be provided to receive O-rings  92  adjacent these ends. 
     The attachment ends  78  and  82  are inserted into recesses  86  and  88  of a harbor portion of the valve housing. As will be appreciated from  FIG. 15 , these recesses are in fluid communication with a fluid inlet port  116  and a fluid outlet port  118  that extend to the internal bore  32 . 
     Hose clip  24  can be inserted into the slot formed by the retaining segments  20  on the valve housing  16  to simultaneously engage the attachment ends  78  and  82  of the hoses  26  and  28  by engaging the recesses  80  and  84 . 
     The clip  24  has two legs  91  connected by a waist  93 . These define a receiving area  95  there between. There are also notches  97  near the lower heel of the legs  91 . When the tubes are axially aligned one over the other the receiving area  95  helps catch the tubes between legs  91 . Notches  97  then help catch the lower tube. 
     This clipped attachment system is advantageous because it permits two hoses to be held in place with the insertion of a single clip. Moreover, because the clip can easily be slid into place, it is easier to connect hoses than it would be to do so using a threading system. 
     Of course, other ways of having a single sliding clip catch two tubes simultaneously could be used. For example, a single prong could extend into catch grooves on the inward sides of the tubes, rather than requiring two prongs. 
     Referring now to  FIGS. 5-8 , the stationary disk  50  is shown in greater detail. It may be made of a ceramic material which has a lower valve seal  52  made of a different material inserted into the recessed groove  77  to seal the space between the stationary disk  50  and the bore  32 . 
       FIGS. 9-12  show the moveable disk  48  in detail. It may also be made of a ceramic material. In any event, it preferably has a pair of recesses  68  that are separated by a wall  70  on one of the faces  71  of the moveable disk  48 . As can be seen from  FIG. 12 , the pair of recesses  68  have a concave geometry along a curved internal wall surface  94 . As shown, the profile of the curved internal wall surface  94  is roughly cylindrical such that the curved internal wall surface  94  approaches the face  71  at points  96  and  98 , but the concave surface reaches a maximum distance from the face  71  near a point  100 . This contouring helps to minimize undesired forces and turbulence which might otherwise occur when the flow path of the water reverses itself. 
     Similar to the stationary disk  50 , the pair of recesses  68  in the moveable disk  48  may be back-to-back d-shaped shapes in plan view. 
     At one rotational limit of the valve stem  12  the d-shaped profiles on the moveable disk  48  and the stationary disk  50  can be aligned. This orientation would be a closed position of the disk valve, as the partition walls  70  and  74  are aligned such that the inlet and outlet ports are not in fluid communication with one another. 
     After a 90 degree turn of the valve stem  12 , the wall  70  would be at a right angle relative to the wall  74 . This orientation would correspond to an open position of the disk valve, since the inlet and outlet ports would now be in fluid communication with one another. 
     There are many benefits of providing partitioned ceramic disks. 
     For one, the symmetry of the disks allows for their use in various valve applications without altering the geometry of the disks. For example, the moveable disk could be configured in one valve such that the clockwise rotation of the moveable disk opens the valve. However, in a different valve, the same moveable disk could be configured such that the counter-clockwise rotation of the moveable disk opens the valve. As described above, the assembly of these two valves might be similar except for the configuration of an adaptor disk. Thus, the use of partitioned disks can eliminate the need for separate production equipment for manufacturing disks for clockwise and counter-clockwise type applications. 
     Additionally, partitioned disks may reduce the contact area between the moveable disk  48  and the stationary disk  50 . The reduced contact area decreases the amount of water deposit build up between the moveable disk  48  and the stationary disk  50  and, thus, reduces operating friction over time. 
     Further, the use of ceramic disks eliminates the valve drive shaft from exposure to various water chemistries. This eliminates many of the negative effects of water on valve operation by minimizing the number and types of valve components that the water contacts. This minimizes the likelihood of the water being exposed to a lead-containing component in the valve or corroding the valve parts. 
     It should be appreciated that in some forms, the particular geometry of the recesses  68  in the moveable disk  48  and the apertures  72  in the stationary disk  50  may be differently shaped. Referring now to  FIGS. 5A and 9A , an alternative form of the stationary disk  48 ′ and  50 ′ are shown, with like features having like numbers as  FIGS. 5 and 9 , but with the addition of primes. Notably, the shape of the partitioned apertures  72 ′ and recesses  68 ′ have been altered along the contacting faces of the disks  48 ′ and  50 ′. In particular, the curved walls of the D-shape have been moved closer to the partition wall at each end, while the center portion of the curved wall extends away from the partition wall. 
     Changes to the geometry of the partitioned recesses and apertures allow for flexibility of the relationship between flow rate and angle of rotation. By tweaking the shape of the recesses and apertures, the flow rate-angle relationship can be finely adjusted. In comparison to the double-D shaped partition in  FIGS. 5 and 9 , these disks  48 ′ and  50 ′ would reduce the initial flow rate upon rotation, giving more fine control over flow over the first ten to twenty degrees of movement. 
     Referring now to  FIGS. 13 and 14 , a bonnet nut  14  can have an outer hex fastening surface  102 , a bore  104  having an inner surface  106  and a counterbore  108  having an inner surface  110 . When referring to the surface of the bore with respect to the bonnet nut  14 , the surface being referred to can include any portion, or all of, surfaces  106  and  110 , as well as the perpendicular surfaces  112  and  114 . 
     The bonnet nut  14  secures the valve cartridge  30  into the bore  32  in the valve housing  16 . The bore  104  permits the valve stem  12  to extend out of the bonnet nut  14  such that the valve stem  12  may be turned and the counterbore  108  may permit the valve cartridge  30  to be held in the bore  32 . 
     The bonnet nut  14  can have its internal bores designed to provide specific resistance to stem rotation when the stem rubs against it. For example, easy rotation can be achieved by coating the bonnet with a slip coating. 
     Alternative modifications may be made to the inner surfaces  106  and  110  of the bonnet nut  14 . For example, flexible fingers may be added to some or all of the inner surfaces  106 ,  110 ,  112 , and  114  to rub the valve stem  12  as it is rotated. Such fingers may be polymeric or elastomeric in nature. Likewise, the bonnet nut  14  may be composed of a particular material having an optimal frictional surface, such as, for example, a glass-filled polymer, such that frictional forces between the bonnet nut  14  and at least a portion of the valve stem  12  provides tactile resistance to the applied torque. 
     Other modifications may be provided to create a specific rotational feel. For example, it is contemplated that the shape of the bore  104  and counterbore  108  could be designed such that a pocket of lubricant could be placed between the bonnet nut  14  and the valve stem  12 . The lubricant used in the pocket could be selected to have an appropriate viscosity and resistance to the forces applied during rotation that an appropriate amount of resistance is provided. 
     Likewise, a set of bearings could be inserted between the bonnet nut  14  and the valve stem  12 . The set of bearings could be selected such that resistance is provided as the valve stem  12  is turned. 
     Many prior art valve assemblies have their valve cartridges held in place by clips or caps threaded on the exterior of the valve housing. In contrast, this valve assembly preferably places the interior of the valve housing  16 . This opens up the possibility of recessing the nut partially or totally within the valve housing. 
     In  FIG. 15  the valve is shown in the closed position. Recesses  86  and  88  extend up to ports  116  and  118 . A lower valve seal  52  provides a water-tight seal between the surface of the bore  32  and the stationary disk  50 . 
     While various embodiments have been described, it will be apparent to those skilled in the art that other changes can be made as well. Therefore, the present invention is not to be limited to just the described most preferred embodiment. Hence, to ascertain the full scope of the invention, the claims which follow should also be referenced. 
     INDUSTRIAL APPLICABILITY 
     The present invention provides an improved fluid control valve, particularly with respect to reducing contact between potable water and a leaded metal housing, simplifying connection of supply and outlet hoses, and supporting and optimizing stem movement.