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Class Information
Number: 137/625.35
Name: Fluid handling > Systems > Multi-way valve unit > Dividing into parallel flow paths with recombining > Reciprocating > Spool > With internal passage
Description: Devices wherein one flow path is through the longitudinal axis of the spool, e.g., a hollow spool with flow therethrough.

Patents under this class:

Patent Number Title Of Patent Date Issued
8671985 Control valve assembly Mar. 18, 2014
8646481 Valve having integrated pressure assist mechanism Feb. 11, 2014
8602053 Valve assembly for a differential pressure sensor with automatic zero point calibration and flushing Dec. 10, 2013
8590570 Two step valve actuator Nov. 26, 2013
8387659 Pilot operated spool valve Mar. 5, 2013
8356630 Valve damping system Jan. 22, 2013
8322372 Flow force reduction by incremental pressure drop Dec. 4, 2012
8267121 Valve assembly for counteracting flow forces Sep. 18, 2012
8118112 Rock breaking device, protection valve and a method of operating a rock breaking device Feb. 21, 2012
7766041 Flow force reduction by incremental pressure drop Aug. 3, 2010
6968816 Oil flow control valve Nov. 29, 2005
6935290 Avoid drawing air into VCT chamber by exhausting oil into an oil ring Aug. 30, 2005
6155654 Method for controlling electromagnetic proportional pressure control valve Dec. 5, 2000
5381998 Cylinder gas valve Jan. 17, 1995
5379936 Flow control valve assembly Jan. 10, 1995
5156181 Removable seats for a dual poppet valve Oct. 20, 1992
5022436 Balanced dual poppet valve Jun. 11, 1991
4966193 Timing control for a dual poppet valve Oct. 30, 1990
4756330 Flow divider valve Jul. 12, 1988
4726453 Self-adjusting single- or twin-tube shock absorber Feb. 23, 1988
4475568 Pressure reducing and regulating valve Oct. 9, 1984
4458718 Spool valve and seal having zero leakage Jul. 10, 1984
4444216 Pressure reducing and regulating valve Apr. 24, 1984
4429716 Control valve Feb. 7, 1984
4391103 Fluidic cryogenic refrigerator Jul. 5, 1983
4389850 Hybrid cryogenic refrigerator Jun. 28, 1983
4388809 Cryogenic refrigerator Jun. 21, 1983
4098294 Flow control valve Jul. 4, 1978
4079886 Double ported expansion valve Mar. 21, 1978
4040675 Anti-theft vehicle brake-supervising device Aug. 9, 1977
3970109 Shutoff and control slide Jul. 20, 1976

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