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Class Information
Number: 137/630
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)
Description: Subject matter in which one valve is arranged to control a passage through the other valve element.










Sub-classes under this class:

Class Number Class Name Patents
137/630.15 Actuator moves both valves 93
137/630.14 First valve moves second valve 86
137/630.12 Gate 21
137/630.11 Locomotive throttle 0
137/630.13 With balancing chamber 17


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8678034 Space-saving quick acting control valve for a steam turbine Mar. 25, 2014
8671987 Two-stage, slow-start valve apparatus Mar. 18, 2014
8671988 Fluid flow control members for use with valves Mar. 18, 2014
8622088 Solenoid valves capable of controlling valve-opening area Jan. 7, 2014
8596301 Valve assembly Dec. 3, 2013
8517046 Redundant metal-to-metal seals for use with internal valves Aug. 27, 2013
8506692 Valves capable of controlling valve-opening area Aug. 13, 2013
8387657 Methods and apparatus to determine a position of a valve Mar. 5, 2013
8371103 Valve assembly and method for high temperature internal combustion engines Feb. 12, 2013
8342206 Dual butterfly control valve and method of use Jan. 1, 2013
8256462 Fluid flow control members for use with valves Sep. 4, 2012
8104281 Nested valve and method of control Jan. 31, 2012
7905254 Shut-off valve Mar. 15, 2011
7766734 Method and apparatus for passively controlling airflow Aug. 3, 2010
7128080 Surge prevention device Oct. 31, 2006
6910504 Surge prevention device Jun. 28, 2005
6901962 Surge prevention device Jun. 7, 2005
6843264 Multi-phase pressure control valve for process chamber Jan. 18, 2005
6814338 Two-port vacuum valve capable of adjusting valve-opening Nov. 9, 2004
6745794 Flow control valve Jun. 8, 2004
6663194 Solenoid valve for brake systems Dec. 16, 2003
6634382 Hydraulic control device Oct. 21, 2003
6622743 Surge prevention device Sep. 23, 2003
6581621 Valve and fuel tank provided with a valve for a motor vehicle Jun. 24, 2003
6581635 Pilot-type two-port vacuum valve Jun. 24, 2003
6513541 Vent valve Feb. 4, 2003
6289932 Dual port soft start valve Sep. 18, 2001
6283154 Control valve for use in a reservoir injection system for a diesel engine Sep. 4, 2001
6273136 Differential valve, specifically a cabin air discharge valve in an aircraft, and method for regulating cabin pressure Aug. 14, 2001
6250383 Lubricator for underbalanced drilling Jun. 26, 2001
6073654 Hydraulically trippable check valve for underground mine support hydraulics Jun. 13, 2000
6032692 Electromagnetic valve, in particular for hydraulic motor vehicle braking systems with wheel slip regulation Mar. 7, 2000
5848608 Vacuum-pressure-control slow exhaust valve Dec. 15, 1998
5810330 Magnetic valve for a traction-controlled hydraulic brake system for motor vehicles Sep. 22, 1998
5657962 Solenoid valve closure part and recycling circuit for the petrol vapours of internal combustion engines Aug. 19, 1997
5651383 Quick-coupling component with pressure reduction member Jul. 29, 1997
5518024 Overfill prevention device for storage tanks May. 21, 1996
5388622 Automatic shutoff valve Feb. 14, 1995
5335692 Valve having rotatable cage Aug. 9, 1994
5241983 Device for automatically controlling the flow of liquid into a tank Sep. 7, 1993
5172722 Stop valve for a vacuum apparatus Dec. 22, 1992
5139051 Unloading valve for an air compressor system Aug. 18, 1992
4962783 Butterfly valve apparatus and method Oct. 16, 1990
4896699 Solenoid valve Jan. 30, 1990
4759255 Brake booster with solenoid valves Jul. 26, 1988
4674922 Apparatus and process for controlling a charging operation for a feed of particles of bulk material Jun. 23, 1987
4638974 Electrohydraulic valve assemblies and method Jan. 27, 1987
4448216 Subsurface safety valve May. 15, 1984
4154403 Spraygun May. 15, 1979
4027474 Fuel prefill and distributor valve construction Jun. 7, 1977

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