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Class Information
Number: 137/466
Name: Fluid handling > Line condition change responsive valves > Safety cut-off requiring reset > Fluid counter-biased or unseated valve > With fluid pressure seating of valve
Description: Apparatus in which the incoming pressure urges the cut-off valve toward its seat or holds it closed after the valve has closed in response to the decrease in pressure.

Patents under this class:

Patent Number Title Of Patent Date Issued
7429198 Electrode connector for ring laser gyros Sep. 30, 2008
7207348 Machine comprising a safety valve for the supply of pressurised fluid Apr. 24, 2007
7033134 Air turbine starter having a force balanced, pressure energized, weighted check valve Apr. 25, 2006
6679053 Device for preventing unintentional restarting Jan. 20, 2004
5365965 Hydraulic automatic shutdown valve system Nov. 22, 1994
5289843 Hydraulic safety valve Mar. 1, 1994
5228469 Fluid control system Jul. 20, 1993
4768539 Pipeline safety valve Sep. 6, 1988
4742841 Water shut-off valve May. 10, 1988
4650152 Automatic shut-off valve for welding electrode coolant systems Mar. 17, 1987
4161960 High and low tubing pressure actuated well safety valve Jul. 24, 1979
4097184 Pressure operated valve Jun. 27, 1978
4090688 Low pressure shutoff valve for fluid operated tool May. 23, 1978

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