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| Number | Title | Issue Date |
| 7442017 | Displacement type compressor having a self-start synchronous motor and start load reducing means In order to make a displacement type compressor be able to reliably start without increasing an outside diameter dimension of the compressor while using a self-start synchronous motor having high energy efficiency, the displacement type compressor according to the i... | 10/28/2008 |
| 7334597 | Liquid/vapor bypass valve Bypass valve assembly that selectively establishes a bypass path for a fluid delivery system and having a body member with a fluid inlet and a bypass fluid outlet, a slidable piston assembly and a slidable cage assembly. Spring members bias the piston assembly and t... | 02/26/2008 |
| 7214036 | Screw type vacuum pump A screw vacuum pump which allows reduced power, lower inside gas temperature, and reduced discharging time. The pump has a pair of screw rotors rotatively engaged with each other in a pump casing to discharge a gas along a longitudinal direction of the pump. Each ro... | 05/08/2007 |
| 7189067 | Scroll compressor having vacuum preventing structure A scroll compressor having a vacuum preventing structure includes: a casing forming a receiving space therein; a fixed scroll fixed to a main frame installed in the casing, and including a back pressure passage at an outer side surface thereof, a discharge pressure ... | 03/13/2007 |
| 7165950 | Two-stage pressure relief valve A two-stage pressure relief valve for use with hydraulic systems is disclosed. The two-stage pressure relief valve has a first stage that relieves increases in hydraulic system pressure over the normal operating pressure and up to a selected threshold pressure level... | 01/23/2007 |
| 7074013 | Dual volume-ratio scroll machine The present invention provides the art with a scroll machine which has a plurality of built-in volume ratios along with their respective design pressure ratios. The incorporation of more than one built-in volume ratio allows a single compressor to be optimized for m... | 07/11/2006 |
| 7066199 | Valve assembly A valve assembly for use in regulating the flow of fluid between a first fluid side and a second fluid side of a hydraulic circuit. The valve includes a valve guide, a valve stem engaged to the valve guide and a valve seat. A bore is extended through the valve seat,... | 06/27/2006 |
| 6984114 | Two-step self-modulating scroll compressor A self-modulating scroll compressor includes a pair of valves. A first valve moves to a low capacity position when the pressure differential is below a predetermined amount. A second valve moves to a low capacity position when the suction pressure is above a predete... | 01/10/2006 |
| 6962485 | Constant bypass flow controller for a variable displacement pump A fuel metering unit for controlling a variable displacement pump including a main metering valve in fluid communication with the pump for metering an output of the pump, a pressure regulator in fluid communication with the metering valve to create a spill return an... | 11/08/2005 |
| 6955045 | Oil pump system Variable displacement pump pumps oil to one or the other ports of an oil operated vehicle wheel motor to drive a lawn mower. ... | 10/18/2005 |
| 6893229 | Vacuum preventing device of scroll compressor Disclosed is a vacuum preventing device of a scroll compressor comprising: a discharge cover installed at a body of a fixed scroll for dividing inside of a case into a discharge region and a suction region; a vacuum cylinder installed in the discharge cover thus to ... | 05/17/2005 |
| 6884042 | Two-step self-modulating scroll compressor A self-modulating scroll compressor includes a pair of valves. A first valve moves to a low capacity position when the pressure differential is below a predetermined amount. A second valve moves to a low capacity position when the suction pressure is above a predete... | 04/26/2005 |
| 6695592 | Compressor provided with pressure relief valve A compressor has a high-pressure relief valve and a low-pressure relief valve. The high-pressure relief valve in use for a discharge region opens when the pressure of gas in the discharge region is more than a first predetermined pressure. The high-pressu... | 02/24/2004 |
| 6672065 | Multiple stage compressor with rotors using rollers A multistage compressor assembly containing at least two guided rotor compressor stages, each of which contains an eccentric mounted on a shaft located within a housing, a rotor mounted on the eccentric shaft which contains at least three intersecting fac... | 01/06/2004 |
| 6478550 | Multi-stage capacity-controlled scroll compressor A first bypass valve (27) that sets discharge capacity to 60% is provided in a first scroll 21 of an asymmetrical spiral-type scroll compressor. Also, a second bypass valve (40) that makes suction side and discharge side communicated with each other so th... | 11/12/2002 |
| 6419456 | Switch for controlling the motor of a piston pump A fluid pump having a motor operably coupled to a pump assembly, the motor and pump assembly acting cooperatively to pressurize a fluid includes a pressure switch being in communication with the fluid under pressure and being in communication with the mot... | 07/16/2002 |
| 6382929 | Valve combination for vibration pumps A valve combination for vibration pumps performs multiple functions of self-priming, compensation of negative pressure and protection against over pressure. A body (12) contains a non-return valve (18). A valve (26) releases air and compensates for negati... | 05/07/2002 |
| 6325598 | Variable capacity swash plate type compressor having pressure relief valve A variable capacity swash plate type compressor 10 incorporates a pressure relief valve 43 in fluid communication with a suction chamber 20 and a crank chamber 40. The pressure relief valve 43 prevents over pressurization in the crank chamber 40 to minimi... | 12/04/2001 |
| 6296456 | Positive displacement pump systems with a variable control orifice A positive displacement pump system has first and second delivery passages for pumped fluid and a main delivery passage receiving flow from the first delivery passage and, via a non return valve, from the second delivery passage. A control valve is provid... | 10/02/2001 |
| 6186750 | Oil pump control valve spool with pilot pressure relief valve A valve spool (70) for an oil pump assembly (10) that includes a pilot pressure relief valve (80) to provide pilot pressure relief that increases the stability of the pump assembly (10) and eliminates the delay between the change in the discharge pressure... | 02/13/2001 |
| 6176685 | Scroll compressor in which communication is controlled between adjacent compression spaces In a scroll compressor provided with a fixed scroll member (4) and a movable scroll member (3) which define a plurality of compression spaces (6) therebetween in cooperation with each other, a hole (32) is formed to the fixed scroll member to be communica... | 01/23/2001 |
| 6139285 | Hydraulic pump for power steering system A hydraulic pump including a pressure chamber, a drain passage communicable with the pressure chamber, a delivery port, a discharge path fluidly connecting the pressure chamber with the delivery port, and an orifice disposed in the discharge path. A first... | 10/31/2000 |
| 6135723 | Efficient Multistage pump A multi-stage pump has a housing defining a plurality of stages each having an internal rotor enclosure with each enclosure having a non-pumping inlet and outlet. A plurality of rotor assemblies are operatably contained in housing extending through all of... | 10/24/2000 |
| 6132179 | Scroll type compressor enabling a soft start with a simple structure A compressor has a compressor housing (10) which includes therein a fixed scroll (25) having a fixed plate member (51) and a fixed spiral member (52) provided on the fixed plate member, and a movable scroll (26) having a movable plate member (61) and a mo... | 10/17/2000 |
| 6102671 | Scroll compressor Base wraps 21a and 31a of a fixed scroll 20 and orbiting scroll 30 both have spiral lengths that satisfy specified compression ratio in low speed drive region. Spiral shaped extension wraps 21b and 31b are provided for at least one of the base wraps 21a a... | 08/15/2000 |
| 6095765 | Combined pressure ratio and pressure differential relief valve A pressure relief device has a chamber formed in a fixed scroll of a scroll-type machine, such as a scroll compressor. A piston is housed within the chamber releasably sealingly engaging a first passage which exposes the chamber to a discharge port formed... | 08/01/2000 |
| 6089831 | Compressed air supply system for vehicle compressed air installation and process for controlling said system An air compressor, from whose outlet a supply line leads to an air drier for the purpose of supplying the compressed air system. On the outlet side of the air drier, the supply line branches into a plurality of line branches that lead to at least two cons... | 07/18/2000 |
| 6086336 | Device to reduce pulsations on a hydrostatic positive displacement unit This invention relates to a device to reduce pulsations on a hydrostatic positive displacement units, such as an axial or radial piston machine working both as a pump and as a motor with a reversible direction of rotation. In the displacement units, at le... | 07/11/2000 |
| 6059537 | Aircraft fuel pump with centrifugal pump and regenerative pump stages A fuel pressurization and pumping system for use in a turbine powered aircraft or the like makes use of the advantages of centrifugal pumps, even in a high pressure mode and includes a centrifugal volute pump (24) having a fuel inlet (28) and fuel outlet ... | 05/09/2000 |
| 5993177 | Scroll type compressor with improved variable displacement mechanism In a scroll type compressor wherein a fixed scroll (8) has an end plate (8b) and an involute vane (8a) fixed to the end plate and is coupled to a movable scroll (5) so as to define a pair of working spaces therebetween, the end plate of the fixed scroll a... | 11/30/1999 |
| 5993171 | Scroll-type compressor with variable displacement mechanism A scroll-type variable displacement compressor for use in an air conditioning system of a vehicle has a fixed scroll and an orbiting scroll with a lowered minimum operating capacity. A cylinder is formed within an end plate of the fixed scroll and accommo... | 11/30/1999 |
| 5979788 | Pressure washer valve assembly The present disclosure relates to a valve assembly suitable for use on a pressure washer pump. The valve assembly includes an unloader valve having an inlet port sized and configured to be connected directly to the pressure washer pump. The unloader valve... | 11/09/1999 |
| 5975232 | Power assisted steering apparatus for automotive vehicle A power assisted steering apparatus for a vehicle has a driving source and an actuator for the vehicle's steering mechanism, to power assist the steering operation. The driving source, such as an engine, continuously drives a pump. A working passage is ar... | 11/02/1999 |
| 5810564 | Method and apparatus for improvement in the efficiency of evacuation and compession of fluids An apparatus and method for evacuating gas from a chamber to reduce the pressure therein utilizes a housing having a lower, downwardly facing wall and an upper, upwardly facing wall, a first gas flow director of truncated conical shape having a larger end... | 09/22/1998 |
| 5810565 | Regulating device for displacement pumps The invention relates to a displacement pump, e.g. a vane cell pump, with a flow control valve (13) on the control piston (22) which acts on the pump pressure on the one hand and the consumer pressure taken via a choke device on the other. The control pis... | 09/22/1998 |
| 5807081 | Combination valve for screw compressors Normally closed valve structure is located in a fluid path between the suction and discharge sides of a compressor. The valve structure opens upon a small pressure differential when the higher pressure is in the normal suction side which is indicative of ... | 09/15/1998 |
| 5800135 | Sliding vane pump using a drive shaft as a flow divider for enhanced oil circulation A vane cell (sliding vane) pump having a flow control valve (13) with a control piston (17). The control piston (17) operates as a pressure regulator, wherein a differential pressure that occurs with increasing pump speed is used as the measuring valve fo... | 09/01/1998 |
| 5669761 | Discharge control apparatus of hydraulic pump for automatic transmission In an automatic transmission, the amount of transmission fluid discharged is controlled by a flow control valve. A fixed displacement type pump is connected with a bypass passage through which a part of fluid discharged from a discharge port of the pump f... | 09/23/1997 |
| 5639225 | Scroll type compressor In a scroll type compressor, when the operation of the compressor is stopped, compression chambers, for compressing a fluid, and a suction chamber are communicated with each other through bypass holes, and a spool valve to open and close the holes, so tha... | 06/17/1997 |
| 5630399 | Fuel injection system with employing vane type fuel pump A fuel injection system includes a vane-type fuel pump. The fuel pump has a first bypass passage with a first pressure relief valve for relieving pressurized fuel from a discharge passage downstream of a check valve to the discharge passage upstream of th... | 05/20/1997 |
