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Class Information
Number: 137/514
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > With retarder or dashpot
Description: Valves provided with a dashpot or other retarding means to prevent or reduce chattering or hunting of the valve.










Sub-classes under this class:

Class Number Class Name Patents
137/514.3 End of valve forms dashpot chamber 46
137/514.5 End of valve moves inside dashpot chamber 90


Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
5680881 Valve system for hermetic reciprocating compressor Oct. 28, 1997
5647395 Valved discharge mechanism of a fluid displacement apparatus Jul. 15, 1997
5615987 Worm conveyor for bulk material Apr. 1, 1997
5611664 Apparatus to achieve passive damping of flow disturbances in a centrifugal compressor to control compressor surge Mar. 18, 1997
5605435 Method and apparatus to achieve passive damping of flow disturbances in a centrifugal compressor to control compressor surge Feb. 25, 1997
5483991 Valve with self-centering seat Jan. 16, 1996
5466135 Rotary vane-cell pump Nov. 14, 1995
5409354 Variable displacement pump Apr. 25, 1995
5406977 Automatic flowrate regulator for ventilation and air-conditioning installations Apr. 18, 1995
5392811 High pressure fuel system valve Feb. 28, 1995
5373867 Reed valve mechanism Dec. 20, 1994
5356269 Variable displacement pump Oct. 18, 1994
5307835 Top-entry check valve with threaded fasteners May. 3, 1994
5301707 Anti-whistling duckbill valve Apr. 12, 1994
5290096 Pressure control valve slip-controlled hydraulic brake systems Mar. 1, 1994
5261449 Quick change coupling for tilted disc check valve with top mounted dashpot Nov. 16, 1993
5251664 Quiet check valve for pulsating flow Oct. 12, 1993
5247912 Reed valve mechanism and method for constructing same Sep. 28, 1993
5240036 Check valve with poppet dashpot/frictional damping mechanism Aug. 31, 1993
5230364 Pressure relief valve Jul. 27, 1993
5228468 Valve and valve seat for flat valve and method of making same Jul. 20, 1993
5224511 Spring-loaded safety valve Jul. 6, 1993
5199769 Valve, in particular for slip-controlled hydraulic brake systems Apr. 6, 1993
5125430 Pressure difference relief valve for liquid containers Jun. 30, 1992
5100306 Noise reducing compressor gasket and head assembly Mar. 31, 1992
5050636 Relief valve Sep. 24, 1991
5050637 Relief valve Sep. 24, 1991
5014731 Method for preventing freezing in pipes, and a piping system for carrying out the method May. 14, 1991
4979955 Power assisted prosthetic heart valve Dec. 25, 1990
4948342 Method and device for automatic circulation in a waste water pump station Aug. 14, 1990
4941503 Vacuum assembly including an improved vacuum relief valve assembly Jul. 17, 1990
4930539 Anti-fluttering check valve Jun. 5, 1990
4915129 Check valve Apr. 10, 1990
4911614 Piston type compressor provided with valve assembly structure for reducing noise Mar. 27, 1990
4901760 Reed valve means Feb. 20, 1990
4890641 Frictional damper suitable for pressure relief valves Jan. 2, 1990
4889623 Brining system Dec. 26, 1989
4886085 Vacuum check valve and method of control Dec. 12, 1989
4867199 Bi-petal l check-valve construction Sep. 19, 1989
4856554 Vacuum check valve and method of control Aug. 15, 1989
4854341 Plate valve Aug. 8, 1989
4846221 Ball valve with built-in check valve Jul. 11, 1989
4819690 Pressure control valve Apr. 11, 1989
4788999 Automatic servo-controlled valve with high-speed opening Dec. 6, 1988
4763689 Vacuum check valve Aug. 16, 1988
4756333 Vacuum check valve Jul. 12, 1988
4750516 Vacuum check valve Jun. 14, 1988
4750517 Vacuum check valve Jun. 14, 1988
4749340 Piston type compressor with improved suction reed valve stopper Jun. 7, 1988
4736768 Relief valve of hydraulic devices Apr. 12, 1988

1 2 3










 
 
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