Abstract:
Two independent poppets/valves that open and close independently as a quick connect coupling is mated and unmated are employed as part of a cooling system for high end data processing systems. More particularly, the present invention comprises a quick connect poppet valve having two internal, independently functioning sealing seats therein disposed within a serially connected flow path to prevent leakage and to minimize the effects of debris.

Description:
TECHNICAL FIELD  
       [0001]    The present invention is generally directed to quick disconnect valves. More particularly, the present invention is directed to valves which provide extra security against leakage and the passage of water born contaminants. Even more particularly, the present invention is directed to disconnect valves employed in the cooling systems of large scale mainframe computer systems. 
       BACKGROUND OF THE INVENTION 
       [0002]    The use of water cooling in high end data processing servers also brings with it the desire to employ quick connect/disconnect couplings for ease of installation, maintenance and service. However, with most quick connect valves there is a single level of sealing that occurs within the valve body. If debris or other mechanisms prevent the smooth operation of these valves, then it is more likely that cooling water and/or other cooling fluids might escape. The present invention provides two means with which to close off the water stream to insure proper closure. 
         [0003]    In addition to, but in conjunction with the problem of leakage, it is to be noted that water and or other cooling fluids very often develop the presence of contaminants in the form of debris that moves with the fluid flow. Sometimes this debris can become lodged in a valve seat and produce the undesirable leakage condition referred to above. Even if the cooling fluid is initially of the purest form and contaminant free it is often the case that due to the interaction of the fluid with other portions of the cooling system contaminants and/or debris are introduced into the fluid flow. 
         [0004]    From the above, it is therefore seen that there exists a need in the art to overcome the deficiencies and limitations described herein and above. 
       SUMMARY OF THE INVENTION 
       [0005]    The present invention provides two independent poppets/valves that open and close independently as a quick connect coupling is mated and unmated. More particularly, the present invention comprises a quick connect poppet valve having two internal, independently functioning sealing seats therein disposed within a serially connected flow path. 
         [0006]    In accordance with one embodiment of the present invention, a quick connect poppet valve comprises a housing having a central passage. A first plunger disposed and movable within the passage of the housing against which a first seal is provided. A second plunger is disposed and movable within a second sealing seat which interlocks with the housing. A first biasing device is disposed between the second sealing seat and the first plunger. A retaining member engages the second sealing seat and a second biasing device is disposed so as to urge the second plunger against the second sealing seat with which a second seal is provides. The second biasing device is disposed between the second sealing seat and the retaining member. 
         [0007]    Additional features and advantages are realized through the techniques of the present invention. Other embodiments and aspects of the invention are described in detail herein and are considered a part of the claimed invention. 
         [0008]    The recitation herein of desirable objects which are met by various embodiments of the present invention is not meant to imply or suggest that any or all of these objects are present as essential features, either individually or collectively, in the most general embodiment of the present invention or in any of its more specific embodiments. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]    The subject matter which is regarded as the invention is particularly pointed out and distinctly claimed in the concluding portion of the specification. The invention, however, both as to organization and method of practice, together with the further objects and advantages thereof, may best be understood by reference to the following description taken in connection with the accompanying drawings in which: 
           [0010]      FIG. 1  is an exploded, isometric view of a poppet valve in accordance with the present invention; 
           [0011]      FIG. 2A  is an isometric view of a first plunger employed in the present invention; 
           [0012]      FIG. 2B  is an end view of the plunger shown in  FIG. 2A ; 
           [0013]      FIG. 3  is a more detailed isometric view of the secondary seat shown in  FIG. 1 ; 
           [0014]      FIG. 4  is a more detailed isometric view of the second plunger shown in  FIG. 1 ; 
           [0015]      FIG. 5  is a more detailed, isometric view of the seat shown in  FIG. 1 ; and 
           [0016]      FIG. 6  is a more detailed, isometric view of the housing shown in  FIG. 1 . 
       
    
    
     DETAILED DESCRIPTION  
       [0017]    In  FIG. 1  there is shown an exploded view of one embodiment of the present invention. The valve includes a main poppet seal shown on the left employing two O-ring seals  191  and  192 . However, the present invention employs a second poppet, shown on the right, which slides thru the center of the primary poppet. This second seal is implemented using O-ring  194  as shown. Each poppet has its own sealing surface and is actuated by a spring force. As the quick connect is mated, both poppets are actuated simultaneously to the open position. As the quick connect is unmated, the spring force closes the poppets. If either one does not close fully, the other moves independently to provide the desired sealing. 
         [0018]    More particularly, the embodiment shown in  FIG. 1  includes housing  100  which receives first plunger  110 . A first seal is provided between these two members through the use of O-ring seals  191  and  192  which sit in channels  111  and  112  of plunger  110  respectively (see  FIG. 2A ). Housing  100  includes a central passage for the flow of water or other fluid. In particular, for purposes of mating with a female portion of a quick connect valve, there are also provided grooves or channels  101  and  102  on housing  100  (see  FIG. 6  for greater detail). Channels or grooves  101  or  102  are also provided with O-ring seals (not shown). A second sealing seat  140  is also provided. A second seal is provided in the present invention through the use of second plunger  150  which includes O-ring  194  disposed within channel or groove  151  (see  FIG. 4 ). Secondary seat  140  is also preferably provided with a mechanism for interlocking with housing  100 . In preferred embodiments of the present invention this interlocking mechanism is provided by threaded portion  142  (see  FIG. 3 ; thread detail omitted for clarity). A corresponding threaded portion (not visible) is provided on housing  100 . Second plunger  150  is disposed through a central opening in secondary seat  140  and mates with floating gland seat  120 . Compressible bias means  130  is disposed between gland seat  120  and secondary seat  140 . O-ring  193  is disposed within groove  121  on gland seat  120  (see  FIG. 5 ). The seal provided by O-ring  193  is often described as a traveling seal and its primary function is to keep excess water to a minimum. Second plunger  150  is retained within the assembly by means of retaining member  170 . Additionally, second plunger  150  is urged against secondary seat  140  by means of compressible bias mechanism  160 . 
         [0019]    It should be noted that, while the description above refers to a preferred embodiment of the present invention, many other variations are possible. In particular, compressible bias means  130  and  160  are shown as helical springs. However, any other convenient compressible structure may also be employed. It is also noted that the description above refers to the use of O-rings. However, other sealing structures may be employed such as lip seals. The above description also indicates that threads are provided for mating second seat  14  to housing  100 . However, any convenient mechanism may be provided for this purpose. In particular, a pin and groove structure or similar arrangement may also be employed. Additionally, is noted that retaining member  170  is preferably provided as a retaining ring which rests within an interior groove on second seat  140  (not visible). However, any other convenient mechanism including a threaded device may be employed for this purpose. It is also noted that first plunger  110  of the present invention may also include a triangularly (prismoidally, in a three dimensional view) shaped insert around which water (or other fluid) flows in the passage made between the flats of the prism and the interior walls of first plunger  110  when the valve is in use, as shown in  FIG. 2B . 
         [0020]    The valve assembly shown in  FIG. 1  also has the advantage that its construction and assembly do not entail the use of any special materials, assembly process, apparatus or material in its construction. Conventional materials such as brass, aluminum, stainless steel and the like are all easily employed and assembled. 
         [0021]    While the invention has been described in detail herein in accordance with certain preferred embodiments thereof, many modifications and changes therein may be effected by those skilled in the art. Accordingly, it is intended by the appended claims to cover all such modifications and changes as fall within the spirit and scope of the invention.