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Class Information
Number: 137/542
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > Reciprocating valves > Spring biased > Spring coaxial with valve > Valve stem extends through fixed spring abutment
Description: Valves in which the valve has a stem which passes through the biasing spring, which is mounted between abutments one of which is fixed and comprises a guide for the stem and the other of which is carried by or comprised in the valve head and/or stem.

Sub-classes under this class:

Class Number Class Name Patents
137/543 Yoke or cage-type support for valve stem 52

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
4622993 Well pipe float valve Nov. 18, 1986
4574836 Bypass valve with indicator Mar. 11, 1986
4548235 Fluid handling device Oct. 22, 1985
4543988 Stop which settles in a device bore Oct. 1, 1985
4537384 In-line check valve having combined downstream poppet support and flow control elements Aug. 27, 1985
4488566 Thermally responsive slam shut valve assembly Dec. 18, 1984
4481974 Safety valve with friction means for damping valve vibration Nov. 13, 1984
4479908 Device for dispersing a fluid in a jet of fluid of higher density, particularly of a gas in a liquid Oct. 30, 1984
4462421 High pressure electrical insulator Jul. 31, 1984
4461452 Valve assembly for a pressure-cooker Jul. 24, 1984
4433703 Panel mounted vacuum control valve Feb. 28, 1984
4413688 Diverter valve Nov. 8, 1983
4336824 Cartridge valve Jun. 29, 1982
4298023 Spring loaded exhalation valve Nov. 3, 1981
4273153 Vibration resistant pressure actuated vacuum breaker Jun. 16, 1981
4271862 Check valve and method of manufacturing said check valve Jun. 9, 1981
4265271 Relief valve May. 5, 1981
4245667 Safety valve Jan. 20, 1981
4238020 Centrifugal clutch with an overspeed relief valve and clutch modulation Dec. 9, 1980
4232585 Power steering gear with flow check valve Nov. 11, 1980
4185656 Dual check valve structure Jan. 29, 1980
4172559 Spring-loaded constant pressure nozzle with secondary modulating means Oct. 30, 1979
4168723 Pressure relief valve Sep. 25, 1979
4142550 Pressure regulating valve Mar. 6, 1979
4132246 Backflow prevention devices Jan. 2, 1979
4124995 Expansion device Nov. 14, 1978
4084609 Cartridge type check valve Apr. 18, 1978
4082224 Fuel injection nozzle Apr. 4, 1978
4078722 Relief valve Mar. 14, 1978
4074695 Pressure-relief valve devices Feb. 21, 1978
3945396 Rapid seating check valve Mar. 23, 1976
3945607 Pressure safety valve Mar. 23, 1976

1 2 3

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