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Class Information
Number: 137/533.25
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > Reciprocating valves > Weight biased > Valve body is the weight > Guided head > Guide stem > Oppositely disposed
Description: Devices in which there are a plurality of rodlike elements projecting from opposite faces of the valve head.










Patents under this class:

Patent Number Title Of Patent Date Issued
8087171 Method of installing axially adjustable driveshaft assembly Jan. 3, 2012
7448408 Check valve Nov. 11, 2008
7441563 Thermostatic expansion valve with check valve Oct. 28, 2008
7410608 Methods for manufacturing a diaphragm for an air admittance valve Aug. 12, 2008
7395835 Air admittance valve Jul. 8, 2008
6782917 Reciprocating cone anti-drainback apparatus Aug. 31, 2004
5913330 Pressure/vacuum relief valve assembly Jun. 22, 1999
5829952 Check valve with a reversible valve ball and seat Nov. 3, 1998
5706854 Venturi vent valve Jan. 13, 1998
5657790 Valves for pressurized containers Aug. 19, 1997
5431186 Valve body design for use with pumps handling abrasive fluids Jul. 11, 1995
5345965 Valve body design for use with pumps handling abrasive fluids Sep. 13, 1994
5297579 Ball and seat-type check valve for downhole rod pump Mar. 29, 1994
5275204 Valve element Jan. 4, 1994
5176162 Predetermined separation fitting Jan. 5, 1993
5117861 Ball and seat-type valve for downhole rod pump Jun. 2, 1992
5062452 Valve member and method of making such a member Nov. 5, 1991
4886085 Vacuum check valve and method of control Dec. 12, 1989
4683910 High-speed protective check valving for pressure transducers and the like Aug. 4, 1987
4682625 Springloaded shutoff valve apparatus Jul. 28, 1987
4667925 Quick coupling hose connection with double acting backflow preventing valve May. 26, 1987
4643221 Vacuum check valve Feb. 17, 1987
4628959 Vacuum check valve Dec. 16, 1986
4215717 Unidirectional valve Aug. 5, 1980
4091837 Freezeproof breather valve May. 30, 1978
4026318 Valve for giant tires May. 31, 1977
4016900 Springless valve for pneumatic tires and the like Apr. 12, 1977











 
 
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