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Class Information
Number: 417/311
Name: Pumps > With condition responsive pumped fluid control > Pressure responsive relief or bypass valve > Adjustable spring loaded valve
Description: Apparatus in which the fluid control means comprises a valve which is biased to a closed position by means of a spring and means are provided for varying the bias of the spring.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7553134 |
Switch valve structure of fluid machine |
Jun. 30, 2009 |
| 7399167 |
Fluid machine operable in both pump mode and motor mode and waste heat recovering system having the same |
Jul. 15, 2008 |
| 6863504 |
Fluid pump relief valve |
Mar. 8, 2005 |
| 6672845 |
Apparatus for preventing vacuum compression of scroll compressor |
Jan. 6, 2004 |
| 6494331 |
Sampler |
Dec. 17, 2002 |
| 6171071 |
Water pump having water cooling device |
Jan. 9, 2001 |
| 6059547 |
Cylinder injection high-pressure fuel pump |
May. 9, 2000 |
| 6053712 |
Cylinder injection high-pressure fuel pump |
Apr. 25, 2000 |
| 5984645 |
Compressor with combined pressure sensor and high pressure relief valve assembly |
Nov. 16, 1999 |
| 5919033 |
Pump having relief valve seat free of direct structural restraint |
Jul. 6, 1999 |
| 5846060 |
Reciprocating piston pump with bleed passages |
Dec. 8, 1998 |
| 5800136 |
Pump with bypass valve |
Sep. 1, 1998 |
| 5651665 |
Adjustable relief valve arrangement for a motor vehicle power steering hydraulic pump system |
Jul. 29, 1997 |
| 5571000 |
Booster pump with bypass valve integrally formed in gasket |
Nov. 5, 1996 |
| 5570999 |
Electromagnetic pump having an automatic exhaust-control valve |
Nov. 5, 1996 |
| 5462413 |
Disposable relief valve seat for positive displacement pump |
Oct. 31, 1995 |
| 5421702 |
Lubricant pump for a turbine |
Jun. 6, 1995 |
| 5407329 |
Pressure regulator for fuel injection devices |
Apr. 18, 1995 |
| 5378116 |
Over-pressure relief means |
Jan. 3, 1995 |
| 5059099 |
Integral pump housing |
Oct. 22, 1991 |
| 5044898 |
Fuel injection pump |
Sep. 3, 1991 |
| 5017099 |
Fluid regulator valve |
May. 21, 1991 |
| 4971527 |
Regulator valve for an ink marking system |
Nov. 20, 1990 |
| 4905477 |
Refrigerant circuit with passageway control mechanism |
Mar. 6, 1990 |
| 4860856 |
Oil pressure adjustment device for engines |
Aug. 29, 1989 |
| 4834623 |
Electric fuel pump |
May. 30, 1989 |
| 4763636 |
Mechanical supercharger |
Aug. 16, 1988 |
| 4722672 |
Hydraulic energy-conversion device |
Feb. 2, 1988 |
| 4472112 |
Pressure control arrangements for an air compression system |
Sep. 18, 1984 |
| 4408967 |
Piston cylinder and head for compressors |
Oct. 11, 1983 |
| 4407640 |
Reciprocating pump having unique pressure control valve construction |
Oct. 4, 1983 |
| 4255094 |
Automatic pressure holding electromagnetic pump |
Mar. 10, 1981 |
| 4251192 |
Rotary pump with symmetrical by-pass and rotor with resiliently mounted vanes |
Feb. 17, 1981 |
| 4246924 |
Valve arrangement |
Jan. 27, 1981 |
| 4201522 |
Boost-retarding device for electromagnetic plunger pump and the like |
May. 6, 1980 |
| 4171708 |
Bypass and unloader valve |
Oct. 23, 1979 |
| 4169695 |
Electromagnetic pump with pressure-regulating mechanism |
Oct. 2, 1979 |
| 4140436 |
Pressure control device for fluid systems |
Feb. 20, 1979 |
| 4035107 |
Pump system for high pressure abrasive liquids |
Jul. 12, 1977 |
| 4022381 |
Airless spray apparatus |
May. 10, 1977 |
| 4021152 |
Electromagnetic pump |
May. 3, 1977 |
| 3975116 |
Pressure responsive fluid valve assembly |
Aug. 17, 1976 |
| 3936237 |
Membrane-air pump adapted to function as a tachometer |
Feb. 3, 1976 |
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