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Class Information
Number: 137/456
Name: Fluid handling > Line condition change responsive valves > Safety cut-off requiring reset
Description: Apparatus in which a valve closes in response to a change in internal condition of the line fluid but does not open when the line condition returns to its previous state, the necessary reopening or resetting operation being performed by an external operator, usually manually.










Sub-classes under this class:

Class Number Class Name Patents
137/464 Fluid counter-biased or unseated valve 18
137/463 Fluid released trip 33
137/461 High pressure cut-off 50
137/462 Reset by pressure equalization valve or by-pass 51
137/458 Responsive to both high and low pressure or velocity 82
137/459 Responsive to change in rate of flow 22
137/457 Thermal 28


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8671972 Safety valve system for overpressure protection of hydraulic circuits Mar. 18, 2014
8596608 Sub sea hybrid valve actuator system and method Dec. 3, 2013
8430115 Leak detection system for humidifier Apr. 30, 2013
8393352 Control system and method for water supply Mar. 12, 2013
8100141 Water supply control assembly with automatic shut-off and duty cycle reset Jan. 24, 2012
8066032 Apparatus for instantaneously terminating movement of flow material through a conduit Nov. 29, 2011
7913714 Check valve and shut-off reset device for liquid delivery systems Mar. 29, 2011
7658203 Fluid sensing shut-off devices with timer and methods of operation Feb. 9, 2010
7644723 Transmix prevention lock Jan. 12, 2010
7509973 System to prevent excess fluid flow with a secondary resetting shut-off valve assembly Mar. 31, 2009
7509975 Fluid sensing shut-off devices with timer and methods of operation Mar. 31, 2009
7357150 Safety shut-off device Apr. 15, 2008
7287444 Transmission pressure modulation by orificed check valve Oct. 30, 2007
7231934 Shut-off actuator with gas generation device Jun. 19, 2007
7077376 Water saver valve Jul. 18, 2006
6467694 Fail-safe structure cooling system Oct. 22, 2002
6460564 Automatic-locking shut-off valve for liquid suction systems Oct. 8, 2002
6186167 Emergency shutdown test system Feb. 13, 2001
6103079 Anti-leakage apparatus Aug. 15, 2000
5971011 Water shut-off valve and leak detection system Oct. 26, 1999
5927316 Safety cut-off system Jul. 27, 1999
5893388 Waterflow monitoring device Apr. 13, 1999
5829470 Differential volume sensing hydraulic control Nov. 3, 1998
5823235 Emergency shut-off mechanism for propane delivery systems and the like Oct. 20, 1998
5771920 Domestic water valve assembly Jun. 30, 1998
5640990 Flexible conduit failure safety valve Jun. 24, 1997
5624551 Hydraulic safety circuit for a hemodialysis apparatus Apr. 29, 1997
5607038 Hydraulic control valve assembly Mar. 4, 1997
5535777 Gas flow safety assembly Jul. 16, 1996
5503175 Water safety system Apr. 2, 1996
5365970 Gravity flow chemigation system and low level shutoff valve Nov. 22, 1994
5238020 Hydraulic valve Aug. 24, 1993
5125433 System for electronically controlling the temperature of water delivered to a bath, shower and the like Jun. 30, 1992
5107891 Safety device for gas welding Apr. 28, 1992
5014759 Vehicle wheel having valve means to prevent misuse May. 14, 1991
4926901 Fluid supply line flow control device May. 22, 1990
4830045 Breaker valve May. 16, 1989
4817664 Gas pressure regulator Apr. 4, 1989
4813492 Low pressure shut off device contained within a pneumatic tool Mar. 21, 1989
4807661 Fluid control valve Feb. 28, 1989
4721128 Safety Shutoff Valve--electromechanical Jan. 26, 1988
4691893 Fail safe gate valves and actuators therefor Sep. 8, 1987
4650154 Blanking cover for pipe Mar. 17, 1987
4589435 Water shutoff valve May. 20, 1986
4197867 Relay indicator valve Apr. 15, 1980
4182369 Spool valve and pilot interface assembly Jan. 8, 1980
4153072 Pilot valve May. 8, 1979
4150925 Fast acting check valve Apr. 24, 1979
4145025 Control device Mar. 20, 1979
4119117 Valve means of a device for removing lubricating oil Oct. 10, 1978

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