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Class Information
Number: 417/308
Name: Pumps > With condition responsive pumped fluid control > Pressure responsive relief or bypass valve > Having additional relief or bypass valve
Description: Apparatus in which there is an additional relief or bypass path having an independent control means to control the flow of fluid in the path.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7553134 |
Switch valve structure of fluid machine |
Jun. 30, 2009 |
| 7442017 |
Displacement type compressor having a self-start synchronous motor and start load reducing means |
Oct. 28, 2008 |
| 7334597 |
Liquid/vapor bypass valve |
Feb. 26, 2008 |
| 7214036 |
Screw type vacuum pump |
May. 8, 2007 |
| 7189067 |
Scroll compressor having vacuum preventing structure |
Mar. 13, 2007 |
| 7165950 |
Two-stage pressure relief valve |
Jan. 23, 2007 |
| 6984114 |
Two-step self-modulating scroll compressor |
Jan. 10, 2006 |
| 6962485 |
Constant bypass flow controller for a variable displacement pump |
Nov. 8, 2005 |
| 6955045 |
Oil pump system |
Oct. 18, 2005 |
| 6893229 |
Vacuum preventing device of scroll compressor |
May. 17, 2005 |
| 6884042 |
Two-step self-modulating scroll compressor |
Apr. 26, 2005 |
| 6695592 |
Compressor provided with pressure relief valve |
Feb. 24, 2004 |
| 6672065 |
Multiple stage compressor with rotors using rollers |
Jan. 6, 2004 |
| 6478550 |
Multi-stage capacity-controlled scroll compressor |
Nov. 12, 2002 |
| 6419456 |
Switch for controlling the motor of a piston pump |
Jul. 16, 2002 |
| 6382929 |
Valve combination for vibration pumps |
May. 7, 2002 |
| 6325598 |
Variable capacity swash plate type compressor having pressure relief valve |
Dec. 4, 2001 |
| 6296456 |
Positive displacement pump systems with a variable control orifice |
Oct. 2, 2001 |
| 6186750 |
Oil pump control valve spool with pilot pressure relief valve |
Feb. 13, 2001 |
| 6176685 |
Scroll compressor in which communication is controlled between adjacent compression spaces |
Jan. 23, 2001 |
| 6139285 |
Hydraulic pump for power steering system |
Oct. 31, 2000 |
| 6135723 |
Efficient Multistage pump |
Oct. 24, 2000 |
| 6132179 |
Scroll type compressor enabling a soft start with a simple structure |
Oct. 17, 2000 |
| 6102671 |
Scroll compressor |
Aug. 15, 2000 |
| 6095765 |
Combined pressure ratio and pressure differential relief valve |
Aug. 1, 2000 |
| 6089831 |
Compressed air supply system for vehicle compressed air installation and process for controlling said system |
Jul. 18, 2000 |
| 6086336 |
Device to reduce pulsations on a hydrostatic positive displacement unit |
Jul. 11, 2000 |
| 6059537 |
Aircraft fuel pump with centrifugal pump and regenerative pump stages |
May. 9, 2000 |
| 5993177 |
Scroll type compressor with improved variable displacement mechanism |
Nov. 30, 1999 |
| 5993171 |
Scroll-type compressor with variable displacement mechanism |
Nov. 30, 1999 |
| 5979788 |
Pressure washer valve assembly |
Nov. 9, 1999 |
| 5975232 |
Power assisted steering apparatus for automotive vehicle |
Nov. 2, 1999 |
| 5810564 |
Method and apparatus for improvement in the efficiency of evacuation and compession of fluids |
Sep. 22, 1998 |
| 5810565 |
Regulating device for displacement pumps |
Sep. 22, 1998 |
| 5807081 |
Combination valve for screw compressors |
Sep. 15, 1998 |
| 5800135 |
Sliding vane pump using a drive shaft as a flow divider for enhanced oil circulation |
Sep. 1, 1998 |
| 5669761 |
Discharge control apparatus of hydraulic pump for automatic transmission |
Sep. 23, 1997 |
| 5639225 |
Scroll type compressor |
Jun. 17, 1997 |
| 5630399 |
Fuel injection system with employing vane type fuel pump |
May. 20, 1997 |
| 5584673 |
Device for reducing the pressure of a compressor in the idling and shutdown mode |
Dec. 17, 1996 |
| 5577897 |
Scroll-type variable-capacity compressor having two control valves |
Nov. 26, 1996 |
| 5551846 |
Scroll compressor capacity control valve |
Sep. 3, 1996 |
| 5478213 |
Fuel injection pump |
Dec. 26, 1995 |
| 5451146 |
Scroll-type variable-capacity compressor with bypass valve |
Sep. 19, 1995 |
| 5378118 |
Cartridge assembly with orifice providing pressure differential |
Jan. 3, 1995 |
| 5362207 |
Portable diesel-driven centrifugal air compressor |
Nov. 8, 1994 |
| 5356271 |
Capacity control mechanism for scroll-type compressor |
Oct. 18, 1994 |
| 5348450 |
Bootstrap method of loading a compressor having a spring loaded blowoff valve |
Sep. 20, 1994 |
| 5277028 |
Hydraulic flow control with temperature sensitive spring biased bypass valve |
Jan. 11, 1994 |
| 5266011 |
Oil distribution gear pumps with integrated air separators |
Nov. 30, 1993 |
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