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| Number | Title | Issue Date |
| 7401623 | Double-acting valve unit A hydraulic system includes a charge pump which supplies fluid to variable displacement main pump, a fluid reservoir and valve unit. The valve unit includes a hollow housing having a first end communicated with the reservoir and a second end communicated with the ch... | 07/22/2008 |
| 7377755 | Multi-stage rotary compressor A multi-stage rotary compressor to reduce a driving load and prevent a malfunction due to an abrupt pressure rising. In the compressor of the type including first and second compressing units mounted in a hermetic casing thereof to compress a gas, the gas being prim... | 05/27/2008 |
| 7048000 | Pressure reducing valve A pressure reducing valve includes a housing having a passage therein, a valve body disposed within the passage, and a piston slideably disposed within the passage. The valve body includes a wall arranged transverse to the passage and dividing the passage into an in... | 05/23/2006 |
| 6997685 | Hydraulic system comprising a main pump and a precompression pump The invention relates to a hydraulic system (1) comprising a main pump (12) and a precompression pump (5), whereby the outlet (8) of the precompression pump (5) is connected by a connecting line (9) to the inlet (11) ... | 02/14/2006 |
| 6817839 | Device for delivering moist gases A multistage device (1) for delivering moist gases is provided. Said device comprises several delivery pumps (2, 3) each of which having a displacer that oscillates inside a delivery space, and being connected in series via a connection channel (6 | 11/16/2004 |
| 6739841 | Oil free screw compressor operating at variable speeds and control method therefor An oil free screw compressor having a low-pressure stage compressor body and a high-pressure stage compressor body. Power of a motor driven by an inverter is transmitted to the compressor bodies through gears. A low-pressure stage blow-off two-way valve is provided ... | 05/25/2004 |
| 6695591 | Multi-stage gas compressor system A multi-stage compressor comprises a gas compressor, a centrifugal blower having an input connected with a gas source and an output connected with the gas compressor and providing a flow of compressed gas as a first stage of compression to the gas compres... | 02/24/2004 |
| 6638029 | Pressure ratio modulation for a two stage oil free compressor assembly A two-stage oil free compressor assembly includes a pressure modulation mechanism, which enhances the ambient temperature and altitude capability of the compressor. A selected amount of pressurized fluid is drawn from an output side of a second stage comp... | 10/28/2003 |
| 6572350 | Screw compressor A package-type screw compressor includes a low-pressure stage state compressor and a high-pressure stage compressor. Motive power is transmitted from an electric motor to the two compressors via a speed increaser. The discharge gas, compressed and heated ... | 06/03/2003 |
| 6561766 | Oil free screw compressor operating at variable speeds and control method therefor An oil free screw compressor includes a low-pressure stage compressor body and a high-pressure stage compressor body. Power of a motor driven by an inverter is transmitted to the compressor bodies through gears. A low-pressure stage blow-off two-way valve... | 05/13/2003 |
| 6129518 | Perfected pumping device for feeding fuel from a tank to an internal combustion engine An on-off valve is connected between a high-pressure pump and a low-press pump and is sized to be rapidly activated during the cranking stage of an internal combustion engine. After actuating the on-off valve, surplus fuel is drained into an inner chambe... | 10/10/2000 |
| 6105829 | Fluid dispensing system A fluid dispensing system is provided which has a first diaphragm pump, a filter connected to receive the discharge of said first pump, and a accumulator/second diaphragm pump connected to receive the discharge of said filter. Hydraulic fluids pumped by c... | 08/22/2000 |
| 6089830 | Multi-stage compressor with continuous capacity control A multiple stage rotary compressor having a housing with a pump cavity and an orbiting ring piston in the cavity. A cylindrical post carried by the housing within the orbiting ring. A pair of vanes engaging the outer surface of the orbiting ring to define... | 07/18/2000 |
| 6079952 | Continuous capacity control for a multi-stage compressor A control strategy for a multiple stage rotary compressor having compressive capacity output based on the demand of an air conditioning system. The constant variance in capacity to meet demand is obtained by recirculation of the multiple stages. Capacity ... | 06/27/2000 |
| 6012904 | Vented fuel module reservoir with two-stage pump A main fuel tank in an automotive vehicle contains a reservoir in which is located a two-stage electrically operated pump. The first stage is a rotary side lateral pump which draws fuel from the main tank and delivers it to the reservoir. The second stage... | 01/11/2000 |
| 5878790 | Recovery system for recovering hydrocarbon vapor and offering improved stability A recovery system for recovering hydrocarbon vapor given off by motor vehicle tanks while they are being filled with liquid fuel via at least one dispensing pipe. According to the invention, said recovery system comprises a recovery pipe associated with s... | 03/09/1999 |
| 5865601 | Safety device for avoiding entrapment at a water reservoir drain having a secondary blowing pump A safety device for avoiding entrapment at a water reservoir drain by using a vacuum operated switch to interrupt power to the reservoir pump and by using a pressure pump to generate a positive pressure to dislodge the obstruction from the drain should a ... | 02/02/1999 |
| 5538403 | High pressure pump for fuel injection systems A variable displacement high pressure pump for pumping fluid at a high pressure to an accumulation chamber is disclosed including a low pressure supply pump for supplying fluid at a low pressure, a first high pressure pumping unit for receiving the low pr... | 07/23/1996 |
| 5490765 | Dual stage pump system with pre-stressed diaphragms and reservoir An improved dual-stage pump system is provided for the accurate pumping and filtering of viscous fluids. Two hydraulically activated pumps are provided in series with a filter and reservoir disposed in-line between the two pumps. The reservoir acts as a s... | 02/13/1996 |
| 5431545 | Pumper system for in-situ pigging applications A pumper system is adapted to enable pumps to be switched between parallel operation, for the high flow conditions normally desired for in-situ pigging operations within a line to be cleaned, and series operation, for the high pressure conditions needed i... | 07/11/1995 |
| 5244353 | Gas pumping installation having means for regulating its pumping speed A Roots-type machine is connected to an enclosure to be evacuated via a suction inlet portion, and to a primary pump via a delivery outlet portion. A bellows is disposed transversely in the inlet portion, one end of the bellows being fixed in gastight man... | 09/14/1993 |
| 4850806 | Controlled by-pass for a booster pump A method and apparatus for evacuating an enclosed chamber which utilizes a tandem connection of a booster pump and a mechanical pump in a manner to maximize the rate of evacuation of the chamber but without exceeding the rating of the booster pump and dam... | 07/25/1989 |
| 4815950 | Multi-stage compressor capacity control apparatus The invention has a control pressure extracting port in the delivery side of the low-pressure stage compressor to apply the control pressure to a piston device of the suction throttle valve, thereby making it possible to reliably cancel the starting unloa... | 03/28/1989 |
| 4715789 | High speed hydraulic fluid venting valve in a hydraulic fluid pump A valve assembly for controlling discharge of hydraulic fluid from a high pressure hydraulic fluid container to a hydraulic fluid reservoir and including a valve body having a valve bore, a fluid inlet port communicating with the valve bore on one side of... | 12/29/1987 |
| 4700680 | Two stage fuel pump The present invention provides a two stage fuel pump which is particularly suited for piston aircraft engines. The fuel pump includes a housing having a fuel inlet and a fuel outlet where the fuel inlet is open to a cylindrical swirl chamber formed in the... | 10/20/1987 |
| 4625694 | Fuel pumping apparatus A fuel pumping apparatus for supplying fuel to a compression ignition engine includes a positively reciprocated plunger which during a pumping stroke displaces fuel from a first pump chamber to an outlet and draws fuel into a second pump chamber. The appa... | 12/02/1986 |
| 4588358 | Rotary vane evacuating pump A rotary vane evacuating pump having two series connected pumping stages is disclosed. Each pumping stage is provided as an exchangeable unit and has a housing which is detachably connected to one face of an interface flange. The housings of the pumping s... | 05/13/1986 |
| 4517946 | Fuel injection pump A fuel injection pump comprises a rotor located in a housing, a free piston movably mounted in an axial bore of the rotor, two pump chambers which is formed by dividing said bore by the free piston, and two solenoid valves for supplying fuel to the two pu... | 05/21/1985 |
| 4502283 | Turbocharged engine driven positive displacement blower having a bypass passage A turbocharged internal combustion engine, preferably of the two-stroke cycle type, is provided with a Roots type positive displacement charging blower having a bypass passage in one end plate and controlled by a single plunger control valve responsive so... | 03/05/1985 |
| 4498848 | Reciprocating piston air compressor In a reciprocating piston air compressor, air is induced via an intake valve in the compressor cylinder head and, in addition, air which has been pre-compressed on the rear side of the piston is forced into the cylinder space via slots in the cylinder wal... | 02/12/1985 |
| 4486148 | Method of controlling a motive power and fluid driving system A method of controlling a motive power and fluid driving system according to the present invention is disclosed, which generally comprises the steps of sensing a plurality of operating parameters and at least one control parameter defining the energy quot... | 12/04/1984 |
| 4429540 | Multiple-stage pump compressor A multiple-stage pump compressor is disclosed for utilization in a heating or cooling system which comprises separate hot and cold containers connected to flexible members within pressure chambers in each of a plurality of pumping stages.... | 02/07/1984 |
| 4422425 | Fuel injection pump A fuel injection pump of the rotary distributor type has angularly adjustable stop rings which limit the outward movement of the pumping plungers so as to control the maximum fuel output of the pump. The stop rings have an outwardly extending curved stop ... | 12/27/1983 |
| 4413952 | Small temperature differential heat-powered compressor A pump system is disclosed for pumping a first fluid from a source to a storage facility comprising a multiple-stage small temperature differential heat-powered pump, a second fluid heater operable to heat a second fluid to a fixed hot temperature, and a ... | 11/08/1983 |
| 4390323 | Multiple-stage small temperature differential heat-powered pump A pump system is disclosed for pumping a first liquid from a source to a storage facility comprising a multiple-stage small temperature differential heat-powered pump, a second liquid heater operable to heat a second liquid to a fixed hot temperature, and... | 06/28/1983 |
| 4377139 | Pumping systems A fuel injection pump for supplying fuel to an internal combustion engine includes a plunger reciprocable within a bore by cams on a cam ring. Fuel is supplied to the bore by a throttle. A first valve is provided which connects a point intermediate the th... | 03/22/1983 |
| 4347818 | Externally controlled fuel delivery curve adjustment mechanism for a fuel injection pump A fuel injection pump with a metering valve for metering the fuel charge delivered by the pump and a torque cam piston to set a maximum fuel charge limit, the torque cam piston being axially positioned by fuel transfer pressure in accordance with the pump... | 09/07/1982 |
| 4347045 | Multiple-stage small temperature differential heat-powered pump A pump system is disclosed for pumping a first liquid from a source to a storage facility comprising a multiple-stage small temperature differential heat-powered pump, a second liquid heater operable to heat a second liquid to a fixed hot temperature, and... | 08/31/1982 |
| 4347044 | Pumps A fluid system, especially for a transmission having a hydrodynamic torque converter and a mechanical change speed gear box downstream therefrom. For supplying pressurized fluid to the working chamber of the torque converter, the clutches and brakes of th... | 08/31/1982 |
| 4331119 | Fuel injection system and control valve for multi-cylinder engines A fuel injection system and control valve are disclosed for use with a multi-cylinder engine such as a diesel or proco type engine. The disclosed control valve, which is of the piezoelectric type, controls the fuel injection into the individual cylinders ... | 05/25/1982 |
