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Class Information
Number: 137/512.2
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > Plural > One valve carries head and seat for second valve
Description: Devices in which one of the valves carries the seat for at least one other valve and also serves as the support for the other valve.










Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8631820 Hydraulic control valve for construction machinery Jan. 21, 2014
8607819 Water saving device and method of using same Dec. 17, 2013
8578963 Nonreturn valve for an exhaust line Nov. 12, 2013
8490603 Fuel tank valve device and fuel tank ventilation device Jul. 23, 2013
8459286 Pressure retention valve and integrated valve for tank system Jun. 11, 2013
8381758 Safety relief fill valve assembly Feb. 26, 2013
8297941 Fuel pump Oct. 30, 2012
8267666 Air flow control apparatus Sep. 18, 2012
8006716 Parent-subsidiary guide float valve Aug. 30, 2011
7882836 Diaphragm valve for a respirator Feb. 8, 2011
7681584 Pipe disconnector Mar. 23, 2010
7575016 Pipe disconnector with increased sealing power Aug. 18, 2009
7367353 Combined check valve and pressure relief valve May. 6, 2008
7296594 Combination check valve and neutral valve assembly for use in a hydraulic component Nov. 20, 2007
7258134 Combination check valve and pressure rise rate valve Aug. 21, 2007
7219683 Cut valve with check valve May. 22, 2007
7156135 Quick-release connector structure for an air tank Jan. 2, 2007
7114516 Leak-detecting check valve, and leak-detection alarm system that uses said check valve Oct. 3, 2006
7104277 Valve for controlling a tank internal gas pressure Sep. 12, 2006
7028708 Combined check valve and pressure relief valve Apr. 18, 2006
7004193 Valve arrangement and traffic calming device incorporating such an arrangement Feb. 28, 2006
6951209 Fuel vapor processing system Oct. 4, 2005
6837256 Filler tube mounted fuel tank refueling valve Jan. 4, 2005
6823892 Automatic valve for the stabilization of a thermostatic mixing device Nov. 30, 2004
6818122 Dual stage filter element bypass valve Nov. 16, 2004
6779543 BOP operating system with quick dump valve Aug. 24, 2004
6772790 Fuel tank Aug. 10, 2004
6374852 Leak arresting valve Apr. 23, 2002
6206487 Brake pressure control device Mar. 27, 2001
6123100 Ammonia excess flow valve Sep. 26, 2000
6079519 Combined fill and relief valve Jun. 27, 2000
6000421 Valve device for a heat exchanger located in a bypass in a cooling circuit, especially of an internal combustion engine Dec. 14, 1999
5873297 Fluid-operated brake actuator with check valve Feb. 23, 1999
5794654 Reed valve apparatus Aug. 18, 1998
5762551 Freeze-free vent Jun. 9, 1998
5725369 Gas torch having a gas regulating device Mar. 10, 1998
5685329 Dual inline rupture pin release and reseating spring loaded relief valve Nov. 11, 1997
5632298 Resuscitation and inhalation device May. 27, 1997
5402818 Fuel shut-off device Apr. 4, 1995
5365974 Flow-control valve Nov. 22, 1994
5261792 Reverse osmosis water purifier booster pump system Nov. 16, 1993
5203803 Reverse osmosis water purifier booster pump system Apr. 20, 1993
5176171 Check valve Jan. 5, 1993
5165442 Differential valve Nov. 24, 1992
5125429 Piston pressure-type vacuum breaker Jun. 30, 1992
5117860 Check valve Jun. 2, 1992
5103854 Low pressure check valve for artificial respiration devices Apr. 14, 1992
5095939 Redundant pressurizing valve Mar. 17, 1992
5038724 Debris resistant valve assembly Aug. 13, 1991
5009244 Fire fighting foam mixing system Apr. 23, 1991

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