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Class Information
Number: 137/458
Name: Fluid handling > Line condition change responsive valves > Safety cut-off requiring reset > Responsive to both high and low pressure or velocity
Description: Apparatus in which the valve member is provided with a means to close the valve in response to a predetermined low pressure or velocity of line fluid at a point in the line, and also with means to close the valve in response to a predetermined high internal pressure or velocity occurring in the line.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8156742 Fuel-injection device in a turbomachine Apr. 17, 2012
7677266 Compact manifolded fail safe hydraulic control system Mar. 16, 2010
7637152 Flow meter and flow-regulating system using the same Dec. 29, 2009
7524311 Automatic high negative pressure relief valve and chest drainage units using same Apr. 28, 2009
7370671 Valve activation assembly which mechanically collapses a collapsible member in response to both overpressure and underpressure conditions May. 13, 2008
7283913 Method of executing a leak control system, and a leak control system for performing the method Oct. 16, 2007
6799597 Pressure control system which detects and abates overpressure and underpressure conditions in a pressurized fluid Oct. 5, 2004
6770062 Automatic high negative pressure relief valve and chest drainage units using same Aug. 3, 2004
6763974 Dual piston/poppet flow switch Jul. 20, 2004
6634375 Leak arresting valve Oct. 21, 2003
6412510 Wellhead safety valve control system Jul. 2, 2002
6173734 Leak arresting mechanical flow control valve Jan. 16, 2001
6152167 Valve actuator with emergency shutdown feature Nov. 28, 2000
6116268 Wellhead safety valve control system Sep. 12, 2000
5590685 High-low indicator Jan. 7, 1997
5535777 Gas flow safety assembly Jul. 16, 1996
5341837 Two line pilot valve Aug. 30, 1994
5313975 Gas lockout system May. 24, 1994
5291918 Safety valve actuator assembly Mar. 8, 1994
5261446 Self-contained emergency shutdown valve Nov. 16, 1993
5213133 Pressure responsive pilot control valve May. 25, 1993
5070900 Safety valve actuator assembly Dec. 10, 1991
5007453 Fluid flow control device Apr. 16, 1991
4961560 Two way latching trip valve Oct. 9, 1990
4915613 Method and apparatus for monitoring pressure sensors Apr. 10, 1990
4896698 Pressure adjusting device for controlling liquid gas flow rate Jan. 30, 1990
4883087 Central heating system and water system and method for controlling the tightness thereof Nov. 28, 1989
4817664 Gas pressure regulator Apr. 4, 1989
4768539 Pipeline safety valve Sep. 6, 1988
4618123 Valve system for a hydraulically controlled starting friction clutch Oct. 21, 1986
4559970 Pilot control relay valve apparatus Dec. 24, 1985
4550746 Regulator for mounting on the outlet connection of a gas cylinder or like container Nov. 5, 1985
4535804 Conduit-break valve for a pressure conduit or hose with a surrounding protective conduit or hose Aug. 20, 1985
4523602 Pressure controller Jun. 18, 1985
4512370 High and low pressure sensor Apr. 23, 1985
4510970 Dual seal in-line test valve Apr. 16, 1985
RE31845 Relay valve for fluid actuators Mar. 12, 1985
4503883 Gas pressure regulator with under and over shut-off Mar. 12, 1985
4494568 High pressure sensor base Jan. 22, 1985
4491149 Pressure regulator with over-pressure safety shut-off feature Jan. 1, 1985
4442860 Pilot control relay valve apparatus Apr. 17, 1984
4413643 Hose-break valve Nov. 8, 1983
4381193 Internal treatment system for glassware Apr. 26, 1983
4378011 Lung controlled pressure gas respirator for use with an oxygen mask and valving mechanism therefor Mar. 29, 1983
4364412 Pull type relay valve with automatic lockout Dec. 21, 1982
4320779 Push-type control valve for fluid actuator Mar. 23, 1982
4319603 Self-contained safety system Mar. 16, 1982
4304250 Flow line control system Dec. 8, 1981
4279272 Flow line monitor pilot valve assembly Jul. 21, 1981
4263938 Relay valve for fluid actuators Apr. 28, 1981

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