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Class Information
Number: 137/630.13
Name: Fluid handling > Systems > Sequentially progressive opening or closing of plural valves > Pressure equalizing or auxiliary shunt flow > One valve seats against other valve (e.g., concentric valves) > With balancing chamber
Description: Systems in which a pilot valve controls line pressure in a separate chamber which balances, or tends to balance the pressure differential across the second opened valve.

Patents under this class:

Patent Number Title Of Patent Date Issued
8662110 Shut-off trim including spring loaded check valve Mar. 4, 2014
8596301 Valve assembly Dec. 3, 2013
8534361 Multi-stage pressure equalization valve assembly for subterranean valves Sep. 17, 2013
7284566 Valve arrangement for guiding a liquid against a gas pressure gradient Oct. 23, 2007
5492150 Combination control valve, particularly suitable for thermoelectric power plant Feb. 20, 1996
5119859 Steam governing valve Jun. 9, 1992
5113902 Control valve for media in vapor or liquid form May. 19, 1992
4928733 Steam valve with variable actuation forces May. 29, 1990
4892118 Silent valve Jan. 9, 1990
4711263 Double-acting valve system for underwater breathing or the like Dec. 8, 1987
4679769 Steam turbine control valve for cyclic duty Jul. 14, 1987
4534380 Gas regulator valve Aug. 13, 1985
4304264 Solenoid actuated valve Dec. 8, 1981
4176688 Check valve Dec. 4, 1979
4022247 Balanced valve with pressure sensing means May. 10, 1977
4002319 Bi-directional pressure balanced valve Jan. 11, 1977
3987818 Safety trip valve for steam or gas turbines with means to assure controlled opening from the closed position Oct. 26, 1976

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