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| Number | Title | Issue Date |
| 7422422 | Compressor assembly with pressure relief valve fittings A compressor assembly including a housing that encloses a sealed interior volume and defines an inlet opening and an outlet opening. Refrigerant is communicated from a suction line into the interior volume through the inlet opening. Refrigerant is communicated from ... | 09/09/2008 |
| 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 |
| 7329105 | Multi-directional pump A multi-directional pump is disclosed generally comprising a housing with inlet and outlet ports, a pumping device disposed therein, a first chamber in fluid communication with the inlet port, and a second chamber in fluid communication with the first chamber. The f... | 02/12/2008 |
| 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 |
| 7140846 | Vacuum pump having main and sub pumps A vacuum pump having a rotary shaft that is rotated by a drive source has a main pump and a sub pump. The main pump includes a pump chamber and a gas transferring body that is located in the pump chamber. The main pump is driven by the drive source through the rotar... | 11/28/2006 |
| 7011183 | Suction oil injection for rotary compressor An apparatus and system for immediately lubricating a compressor within a compressor system using a suction oil line apparatus. The compressor system comprises a compressor, a power source for operating the compressor, a tank capable of storing oil therein, a conven... | 03/14/2006 |
| 7000635 | Double valve The invention relates to a double valve with a valve housing (1), for housing two double-headed actuators (30, 31), whereby the double head actuators have differing head diameters (12, 13) and the flow of a fluid through the both actuators (3... | 02/21/2006 |
| 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 |
| 6916158 | Radial piston pump A piston pump including an inlet manifold, and outlet manifold, and a piston ring sandwiched between the inlet and outlet manifolds. The inlet manifold has a first face and a second face with at least one outlet formed in the second face. The outlet manifold has a f... | 07/12/2005 |
| 6908042 | Fuel injector A fuel injector includes a pressure intensifying chamber communicating with a fuel supply passage through a check valve, a plunger for pressure-intensifying fuel introduced into the pressure intensifying chamber, and a needle valve for injecting the fuel pressure-in... | 06/21/2005 |
| 6779608 | Surface pump assembly A surface pump assembly having a pressure vessel containing a submersible pump and an industrial motor located at least partially external to the pressure vessel having a shaft or seal thrust chamber extending at least partially into the pressure vessel to connect t... | 08/24/2004 |
| 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 |
| 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 |
| 6158973 | Multi-stage manual hydraulic pump A multi-stage manual hydraulic pump comprising a plurality of cylinders in tandem. A block holds each cylinder assembly. One or more cylinders are the high volume stage, one or more cylinders are the medium volume stage and the final cylinders are the low... | 12/12/2000 |
| 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 |
| 6079956 | Multi-stage hydraulic pump A multi-stage manual hydraulic pump comprising a plurality of cylinders in tandem. A block holds each cylinder assembly. One or more cylinders are the high volume stage, one or more cylinders are the medium volume stage and the final cylinders are the low... | 06/27/2000 |
| 6071085 | Gas ballast system for a multi-stage positive displacement pump A gas ballast system for a multi-stage positive displacement pump in which a first stage includes at least one positive displacement pump stage, is equipped with an inlet valve and an outlet valve, and is connected with the following stage by an intermedi... | 06/06/2000 |
| 6045338 | Compound gear pumps and engine hydraulic circuits using same A compound gear pump includes an internal gear pump including an outer rotor having on the outer periphery external teeth, an external gear pump including a rotor having on the outer periphery an external teeth circumscribed with the external teeth of the... | 04/04/2000 |
| 5961297 | Oil-free two stage scroll vacuum pump and method for controlling the same pump An oil-free two-stage vacuum pump includes first and second pump stages coupled in series. The first and second pump stages have discharge spaces capable of communicating with each other via a bypass passage. The bypass passage is provided with a pressure... | 10/05/1999 |
| 5846062 | Two stage screw type vacuum pump with motor in-between the stages A screw type dry vacuum pump having dual shafts is disclosed, whereby the process gas is transported through three compartments, a gas admittance pump section, a central drive motor section, and a gas discharge pump section. By placing the drive motor in ... | 12/08/1998 |
| 5575627 | High and low pressure two stage pump and pumping method A pump includes a high pressure portion and a low pressure portion. During low pressure, high volume operation, pressure produced in the high pressure portion of the pump is applied to drive a large area piston in the low pressure portion of the pump. Onc... | 11/19/1996 |
| 5564907 | Evacuating apparatus An evacuating apparatus includes a first pump section disposed on a suction opening side, a second pump section for exhausting a smaller amount of gas than the first pump section, the second pump being disposed in an exhaust opening side, a plurality of r... | 10/15/1996 |
| 5547347 | Gas injection apparatus and method An apparatus and method for dispersing a gas in a liquid and for increasing gas pressure of a gas from a supply pressure to a delivery pressure. A first pump pumps the liquid to produce a pressurized liquid stream. The gas is injected into the pressurized... | 08/20/1996 |
| 5372489 | Two stage vane type compressor A vane compressor capable of obtaining a two stage compression. The compressor has a front and rear rotor 6a and 6b for defining, together with a cylinder bores 43 and 44, first and second operating chambers 39 and 40, respectively. A refrigerant from a f... | 12/13/1994 |
| 5213481 | Fuel pumping apparatus A fuel pumping apparatus of the rotary distributor type has a fluid pressure operable valve which can be opened to terminate delivery of fuel to an associated engine. The operation of the valve is controlled by an axially movable shuttle contained in a cy... | 05/25/1993 |
| 5203682 | Inclined pressure boost pump A submersible pump assembly is mounted within a pressure vessel or jacket for use at the surface for an injection well. The jacket has an inlet which connects to a feed pump for supplying feed water under pressure. The motor, seal section and pump mount w... | 04/20/1993 |
| 5186612 | Variable pressure inlet system for hydraulic pumps In the present fluid system, a variable pressure inlet system is provided and operational to control the operating pressure level of a charge pump in response to various operating parameters of the fluid system. The charge pump provides pressurized fluid ... | 02/16/1993 |
| 5051065 | Power transmission A rotary hydraulic vane pump includes a rotor mounted within a housing, with a plurality of vanes individually slidably disposed in corresponding slots in the rotor periphery. A cam ring surrounds the rotor within the housing and has a radially inwardly f... | 09/24/1991 |
| 5020324 | Charge flow priority circuit A charge flow distribution valve routes all charge pump flow into a main pump until the main pump has sufficient inlet pressure. The valve opens to a first stage which routes excess charge flow to lubrication circuits. At a slightly higher main pump inlet... | 06/04/1991 |
| 4971531 | Pump arrangement driven by compressed-air A compressed air pump comprising a compressed air piston motor (11) having a cylinder housing (12) and a low pressure piston (22) moveable between first and second end wall parts (13, 14) and a hydraulic piston pump (15) in the second end wall part (14). ... | 11/20/1990 |
| 4968219 | Multi-stage compressor with seal heating A sleeve seal heating system for a multi-stage compressor is disclosed. The multi-stage compressor includes a mechanism for dissipating heat disposed between and in fluid communication with a pair of compressor stages in the multi-stage compressor. The pr... | 11/06/1990 |
| 4907949 | Variable flow pump Variable flow pump comprising at least a piston (1) associated with a chamber (2), said piston (1) cooperating with a surface (3) driven in a constant displacement reciprocating movement, characterized in that the piston (1) is free of any continuous mech... | 03/13/1990 |
| 4850828 | Plunger pump of quick pressure-rise type In a plunger pump system of a quick pressure-rise type which is utilized for increasing the pressure of a working fluid to be supplied quickly to a hydraulic actuator, such as an oil hydraulic cylinder, both a high pressure plunger pump and a quick-chargi... | 07/25/1989 |
| 4830581 | Apparatus for dispensing measured quantities of a liquid material The invention concerns an apparatus for dispensing measured quantities of a liquid or liquefied material, comprising first pumping means, capable of delivering a continuous flow of material, second pumping downstream from said first pumping means, said se... | 05/16/1989 |
| 4778350 | Hydraulic pump assemblies A hydraulic pump assembly includes a cam shaft, a pair of high pressure plunger pumps opposed to each other on a first common axis, each of the high pressure plunger pumps having a first plunger of small diameter perpendicular to the cam shaft for recipro... | 10/18/1988 |
| 4738596 | Fuel pumping apparatus A fuel pumping apparatus for supplying fuel to a compression ignition engine includes a high pressure pump to which fuel is supplied from the outlet of a low pressure pump of the vane type. The vanes of the pump are mounted in slots in the pump rotor and ... | 04/19/1988 |
| 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 |
| 4652216 | Compressor inlet control device Compressor inlet control devices control the pressure level at the inlet of a compressor (18) which is operated by an engine (10) equipped with a turbocharger (12) that maintains the intake manifold (16) of the engine (10) at pressure levels greater than ... | 03/24/1987 |
| 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 |
