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| Number | Title | Issue Date |
| 7438537 | Liquid additive injection pump with mixing chamber and one way valve A liquid additive injection pump for injecting a predetermined amount of a secondary fluid into a primary fluid stream wherein a fluid mixing chamber is disposed within the pump housing assembly. A gasket having at least one one-way valve is positioned between the p... | 10/21/2008 |
| 7431572 | Hydraulic oil well pumping installation A hydraulic oil well pumping installation includes a down hole pump positioned down a well, the down hole pump including a master cylinder and at least one slave cylinder in axial alignment with the master cylinder. A master piston is positioned in the master cylind... | 10/07/2008 |
| 7354252 | Pressure intensifier A pressure intensifier for fluids has an intensifier piston with a high-pressure piston and a low-pressure piston having a greater diameter than the high-pressure piston. The pistons are moveable in a high-pressure cylinder and a low-pressure cylinder, respectively,... | 04/08/2008 |
| 7322802 | Thick matter pump comprising a conveyance capacity control system A thick matter pump comprising a drive motor (50), a (reversible) hydraulic pump (6), and two hydraulic cylinders (5, 5′) coupled to conveyor cylinders (7, 7′) for conveying the thick matter. A regulator regulates the rotational speed... | 01/29/2008 |
| 7311502 | Method for using a hydraulic amplifier pump in ultrahigh pressure liquid chromatography A method for supplying solvent to an ultra-high pressure liquid chromatography system using a hydraulic amplifier. The hydraulic amplifier system includes a hydraulic cylinder comprising a primary piston chamber in which a primary piston is disposed and a secondary ... | 12/25/2007 |
| 7284961 | Pumping system, replacement kit including piston and/or cylinder, and method for pumping system maintenance A pumping system including a pump is disclosed. The pump includes a replacement piston and a replacement cylinder associated with the replacement piston. The replacement piston has a cross sectional area smaller than a cross sectional area of an original piston of t... | 10/23/2007 |
| 7284475 | Pneumatic reciprocating motor A gas-actuated reciprocal drive apparatus has a double-acting piston in a pneumatic cylinder having a chamber at each end. Gas from an area of higher pressure in a compressed gas system flows into a first chamber, while the second chamber is in fluid communication w... | 10/23/2007 |
| 7264019 | Controlled-flow hydraulic distributor The hydraulic distributor exhibits a cylindrical and internally-hollow body (2) having an inlet chamber (3) for a fluid and an outlet chamber (4) which are interconnected directly (by a communication conduit), or indirectly by an external distri... | 09/04/2007 |
| 7241080 | Pump for transferring particulate material A pump for transferring particulate material from a source to a remote location, including a particulate chamber having open ends, check valves at the open ends, a vacuum source connected to the chamber adjacent one end, a gas source at the opposed end of the chambe... | 07/10/2007 |
| 7229260 | Oilless air motor assembly for hydraulic pumps An oilless air motor assembly and method useable for driving hydraulic pumps and the like. The air motor assembly comprises a slide valve that moved back and forth relative to a valve sleeve situated about the slide valve. A low friction or lubricious dry seal membe... | 06/12/2007 |
| 7226274 | Cement slab leveling apparatus A concrete slab leveling apparatus is provided that is built upon a vehicle such as a flatbed truck or trailer which makes it highly transportable enabling the invention to move from site to site quickly and easily. The flatbed platform of the vehicle is equipped wi... | 06/05/2007 |
| 7172579 | System and method for irrigation and tissue evacuation and collection The present invention provides a system and method for irrigating and collecting tissue from a body cavity in a patient. The system includes an irrigation and collection device for injecting an irrigation fluid into the body cavity. The irrigation device injects flu... | 02/06/2007 |
| 7163359 | Device for conveying powder and method for operating the same Transport system with several devices (1) for transporting powder, where each device (1) has a transfer chamber (3) into which a supply line (6) and a discharge line (8) for the powder open, and means to generate a negative pressur... | 01/16/2007 |
| 7137792 | Piston pump for high viscous materials In a piston pump (1) having a differential piston (12) positioned in a cylindrical housing (11) and translationally drivable, a first pressure chamber (13) of the differential piston (12) is connectable to a second pressure chamber... | 11/21/2006 |
| 7134847 | Hermetic electric compressor having a suction muffler The present invention provides an hermetic electric compressor capable of stably supplying oil to a compression chamber with a low noise level. The hermetic electric compressor has a closed vessel, an electric element, a compressing element that is disposed over the... | 11/14/2006 |
| 7104057 | Concrete-mortar transfer system of concrete pump car A concrete transfer system for a concrete pump car has a pair of concrete input tubes mounted in a hopper, first and second drive cylinders operating with the concrete input tubes for inputting and outputting the concrete by pressure pistons each having a driving ro... | 09/12/2006 |
| 7071429 | Linear adjustment operator for pressure control of paint pumps A linear adjustment operator for pressure control of paint pumps including a base, an electrical switch, a linear actuator, a spring biasing the switch towards the actuator and a lever acting on the actuator for repositioning the actuator with the switch positioned ... | 07/04/2006 |
| 7069728 | Multi-position BOV actuator A multi-position pressurized fluid actuator is mounted for movement in a casing. The actuator includes at least one selectively openable opening at a location corresponding to an intermediate position through which pressurized fluid can be selectively bled from the ... | 07/04/2006 |
| 7041081 | Continuous liquid infusion device The invention relates to a continuous liquid infusion device which can be easily prepared for operation with small force, and can infuse liquid at constant infusion rate and amount over a long time. It comprises a liquid syringe section and a driving pump section mo... | 05/09/2006 |
| 7025134 | Surface pulse system for injection wells The present invention relates to petroleum recovery operations, and more particularly, to the use of pulse technology to enhance the effectiveness of waterflooding operations. The systems of the present invention generally comprise an injection means for continually... | 04/11/2006 |
| 6962576 | Reciprocating syringes The present invention provides a syringe device comprising: a first syringe comprising: a first syringe barrel including a first opening at a distal end thereof through which fluid may be forced or aspirated; and a first syringe plunger sliding within the first syri... | 11/08/2005 |
| 6948917 | Valving system for a downhole hydraulically actuated pump An engine for actuating a hydraulic downhole pump having a piston vertically reciprocated in a cylinder includes a reversing valve carried with the power piston and serving, when in a first position, to direct fluid flow to force the piston upwardly and in a second ... | 09/27/2005 |
| 6929454 | Thick matter pump In a thick matter pump, especially for delivering concrete, comprising two delivery cylinders, it is known to provide two position sensors in one of the two cylinders for control of the pistons. However, leakage of hydraulic fluid can lead to an imbalance of the two... | 08/16/2005 |
| 6821096 | Multiple component metering and dispensing system A plural component pumping apparatus including a piston and cylinder for each component to be pumped. Reciprocation of the piston in the cylinder draws the component into the cylinder during an intake stroke of the pumping apparatus and exhausts the material from th... | 11/23/2004 |
| 6736612 | Pump A pump including a reciprocating piston movable in a piston chamber by pneumatic pressure. The pneumatic pressure is directed through air channels by one or more valves. At least one of the valves and/or air channels is located in a removable portion of the pump. | 05/18/2004 |
| 6712587 | Hydraulic amplifier pump for use in ultrahigh pressure liquid chromatography A hydraulic amplifier system for an ultra-high pressure liquid chromatography system. The hydraulic amplifier system includes a hydraulic cylinder comprising a primary piston chamber in which a primary piston is disposed and a secondary piston chamber in which a sec... | 03/30/2004 |
| 6676386 | Oilless air motor assembly for hydraulic pumps An oilless air motor assembly useable for driving hydraulic pumps and the like includes a slide valve that moves back and forth relative to a valve sleeve situated about the slide valve. A low friction or lubricious dry seal member is disposed between the... | 01/13/2004 |
| 6676387 | Metering pump with a rotary valve responsive to electrical signals from the contact between a fluid responsive shuttle and dual probes A metering device contains a rotor which defines elongate chamber, there being a shuttle contained within the chamber movable between two terminal end positions. Frusto-conical surfaces defined on the rotor cooperate with annular members defining correspo... | 01/13/2004 |
| 6623254 | High pressure water pump A high-pressure water pump for supplying high pressure water for atomization in the inlet stream of a gas turbine is disclosed which includes at least one hydraulic cylinder containing a piston secured to a piston rod extending from the hydraulic cylinder... | 09/23/2003 |
| 6589027 | Double acting reciprocating motor with uni-directional fluid flow A double-acting reciprocating motor with a uni-directional fluid flow path comprises a piston disposed within a cylinder. Within the cylinder, the piston defines a first chamber between the piston and a cylinder base and a second chamber between the pisto... | 07/08/2003 |
| 6582205 | Fluid motivated grease/water pumping and separating system A grease/water pumping and separating system is provided with a pump mechanism that utilizes a motivating fluid to pump a grease/water mixture. The mixture is sucked into and discharged out of a pumping cavity. A movable biasing boundary, such as a piston... | 06/24/2003 |
| 6511302 | Slurry piston pump with cylinder cleaning apparatus A slurry piston pump (10) including a fluid hose (70) coupled into the back end (26) of a piston cylinder (24) to provide cleaning and/or lubricating fluid (60) into the interior (23) of cylinder (24) while allowing cylinder (24) to be directly coupled to... | 01/28/2003 |
| 6503066 | Hydrostatic pressure test pump A pressure testing apparatus to bring, and maintain, pressure within a test vessel at a proof pressure. The apparatus includes an air motor and a fluid pump which is removably mountable to the air motor. The air motor drives the fluid pump and the pump pi... | 01/07/2003 |
| 6499968 | Integral pump and control valve A pumping unit, particularly for water supply in remote areas of the world, comprising a pump, control valve and tipping bucket mechanism enclosed in a single housing. The pumping unit is double-acting and, does not demand the presence of a drive pipe. Th... | 12/31/2002 |
| 6491882 | High-pressure device The invention relates to a high-pressure device (1) having a cylindrical high-pressure vessel (3) and prestressing means in order to exert an axial pressure on the vessel. The vessel (3) can have been formed from a number of layers of composite material, ... | 12/10/2002 |
| 6485272 | Fluid proportioner An improved fluid proportioner. For improved fluid flow, a body is configured to direct a first fluid wherein at least one fluid gate housing is removably fixed to the body. A bearing pressurably is fitted within the at least one fluid gate housing to sea... | 11/26/2002 |
| 6478552 | Fluid motivated pump A device for pumping a stock fluid by supplying and discharging a motivating fluid to a unit is described. The device develops the suction and discharge of the stock fluid through the motion of a movable biasing boundary within a cavity. The movable biasi... | 11/12/2002 |
| 6435843 | Reciprocating pump for feeding viscous liquid Two cylindrical pump cylinders are mounted end-to-end. A first piston is placed in the first cylinder, a second piston is placed in the second cylinder, and the pistons are interconnected. In one embodiment compressed air alternately drives the first pist... | 08/20/2002 |
| 6422840 | Hydraulic displacement pump having two stroke length A pump having both a short stroke pumping mode and a long stroke pumping mode. The pump has two material cylinders, each with an attached hydraulic cylinder for operating a piston rod extending through both the material and hydraulic cylinders. The piston... | 07/23/2002 |
| 6409482 | Double-force type pressure cylinder structure A double-force type pressure cylinder structure includes a gas cylinder secured on a pressurizing cylinder base, and a top cap secured on the gas cylinder. The pressurizing cylinder base has a liquid inlet port forming a first check valve, a liquid outlet... | 06/25/2002 |
