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| Number | Title | Issue Date |
| 7871250 | Chemical liquid supplying apparatus A chemical liquid supplying apparatus can discharge chemical liquid with high accuracy and monitor a leakage of an incompressible medium from a region between a piston and a cylinder. A pump has a flexible tube for partitioning a pump chamber and a drive chamber, an... | 01/18/2011 |
| 7425120 | Diaphragm position control for hydraulically driven pumps A hydraulically driven pump includes a diaphragm, a piston, a transfer chamber, a fluid reservoir, and a spool member. The transfer chamber is defined between the diaphragm and piston and is filled with a hydraulic fluid. The fluid reservoir is in fluid communicatio... | 09/16/2008 |
| 7337504 | Quick engage/disengage rope cleat A rope cleat including at least rope abutment and at least one cam mounted on a flat base surface. The cam is spring biased to rotate toward an abutment surface. A cover is positionable over the cam and abutment such that, in one position, the rope is restrained fro... | 03/04/2008 |
| 7310852 | Valve assembly The invention relates to a valve assembly for use in connection with carpet cleaning extraction machines and similar extraction cleaning devices. The invention allows the intake of liquid and the mixing of different liquids in a mixing chamber, such as clean water w... | 12/25/2007 |
| 7311085 | Electromagnetic controlled fuel injection apparatus An electromagnetic controlled fuel injection apparatus is provided in which a housing assembly with two sets each including a solenoid device and an open/close valve device being fixed directly to a housing is fixed to a plunger unit to decrease the length of the fu... | 12/25/2007 |
| 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 |
| 7224347 | Writeboard method and apparatus A writeboard according to an embodiment of the invention includes plural display cells capable of controlling light within a visible-light spectrum, the display cells being arranged over a display surface of the writeboard. The writeboard also typically includes plu... | 05/29/2007 |
| 7220381 | Method for high pressure treatment of substances under controlled temperature conditions A product carrier for use in pressure processing substances is substantially fluidically closed, and is insulated, to prevent heat transfer from the product being treated to the cooler wall of the pressure vessel. The insulating material has compression heating prop... | 05/22/2007 |
| 7114929 | Reciprocating pump and check valve In a reciprocating pump, drive power of a drive-power supply member is transmitted to a diaphragm within a diaphragm drive chamber via operating fluid. An operating-fluid-flow regulation chamber for regulating the flow of operating fluid is located between the drive... | 10/03/2006 |
| 7090474 | Diaphragm pump with overfill limiter A diaphragm pump which overcomes the problem of diaphragm failure due to overfill of the oil transfer chamber. An overfill preventive element in the form of a mechanical stop, a fully closed coil spring, or a valve system, or alternatives are provided. ... | 08/15/2006 |
| 7029245 | Blood pumping unit, with a coplanar disk inlet valve and an annular outlet valve A unit for pumping fluid, particularly blood, is provided with an enclosure that has two half-shells and an elastic membrane fixed perimetrically to the enclosure in order to divide its space into two parts. One of the half-shells is provided with valves that are lo... | 04/18/2006 |
| 7004731 | Diaphragm pump having a gas venting surface A scarred surface structure on the cover curvature of a diaphragm compressor is created by shot blasting. The scarred surface structure hinders the sealing effect between the cover curvature and the diaphragm and thereby counteracts the formation of gas cushions. | 02/28/2006 |
| 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 |
| 6899530 | Diaphragm pump with a transfer chamber vent with a longitudinal notch on the piston cylinder A diaphragm pump which overcomes the problem of diaphragm failure due to overfill of the oil transfer chamber and the inability to self-prime. A notch is provided in the upper portion of the surface of the cylinder so that air can be forced back to the reservoir. In... | 05/31/2005 |
| 6767189 | Method for the control and regulation of the oil pressure-gas pressure relationship of diaphragm compressors A method for the control and regulation of the oil pressure-gas pressure relationship of diaphragm compressors. The function of a diaphragm compressor is mainly dependent on a given minimum relationship of gas pressure and oil pressure. When this is undershot... | 07/27/2004 |
| 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 |
| 6672841 | Pumping and metering device The present invention relates to a pumping device for delivering and metering fluids, in particular medical fluids such as dialysis fluids, with a piston unit having a driving device and a piston and with a membrane unit which has a membrane and a first c... | 01/06/2004 |
| 6439083 | Universal spring tool A tool or device is comprised of a generally cylindrical plunger that is retained in a generally cylindrical body. A spring fits inside the body to spring-load the plunger by means of a jam nut or other tensioning device. The plunger has tapped mounting h... | 08/27/2002 |
| 6276907 | Hydraulically driven diaphragm pump A diaphragm pump for pumping a fluid, such as paint, includes a diaphragm separating a first chamber for accommodating and dispensing the paint from a second chamber for accommodating a drive fluid, and a piston that reciprocates to drive the drive fluid ... | 08/21/2001 |
| 6264436 | Multifunction valve A multifunction hydraulic valving apparatus includes a relief valve, a gas purge valve and a bleed valve disposed in a single bore.... | 07/24/2001 |
| 6264437 | High pressure pump for all liquids A device enables the pumping of any kind of liquid while giving the liquid very high delivery pressure. The units that cause pumped liquid suction and then its delivery are driven exclusively by hydraulic means excluding mechanical means. So that there is... | 07/24/2001 |
| 6257850 | Piston and seals for a reciprocating pump A piston and seals for a reciprocating pump improve pumping of subterranean fluids containing fine solids to surface. The pump comprises a pump barrel and piston. The piston is suspended from a reciprocating rod string or from reciprocating production tub... | 07/10/2001 |
| 6071089 | Hydraulic diaphragm pump A high pressure hydraulic diaphragm pump having a pressure chamber on one side of a diaphragm and a fluid delivery chamber on the other side of the diaphragm with a reciprocating piston assembly including a piston member being provided for pressurizing th... | 06/06/2000 |
| 5899671 | Hydraulic driven diaphragm pump with mechanical diaphragm stroke limitation For a hydraulically driven diaphragm pump with a diaphragm consisting of at least two individual layers, these layers are clamped at least in their central area between a coupling part on the feed area side and the hydraulics area side and are thus mechan... | 05/04/1999 |
| 5860793 | Diaphragm metering pump with push to prime air bleeder valve A new and improved diaphragm metering pump is provided with a modular removable drive assembly. The removable drive assembly provides rotation to an eccentric shaft within the pump and is disposed outside rotary bearings for the eccentric shaft and outsid... | 01/19/1999 |
| 5810567 | Hydraulic Diaphragm pump On a hydraulic diaphragm pump with a diaphragm including at least two individual layers, a dimensionally stable reinforcing element that moves together with the diaphragm and is kept in contact with the diaphragm is provided in the central area of the dia... | 09/22/1998 |
| 5730506 | Vibration damper for damping vibrations in a fluid in a slip-controlled hydraulic brake system of a vehicle system A space-saving vibration damper that functions reliably for a long term. The vibration damper has a housing that includes at least one concave recess which is sealed by a disk-shaped diaphragm comprising a spring steel sheet. The diaphragm is connected by... | 03/24/1998 |
| 5707219 | Diaphragm pump A diaphragm pump is provided having a plurality of piston inlets connecting a hydraulic fluid source with the piston chamber and a plurality of check valves each having a ball and valve seat disposed within the inlets. The valve seat includes a conical se... | 01/13/1998 |
| 5246351 | Hydraulically driven diaphragm pump with diaphragm stroke limitation In a hydraulically driven diaphragm pump, which is provided with a diaphragm clamped on the edge which separates a delivery chamber from a hydraulic chamber, the hydraulic chamber being subdivided into a diaphragm work chamber and a piston work chamber co... | 09/21/1993 |
| 5192425 | Mounting base and assembly for pressure sensor, filter and pressure relief valve Single-piece manifold for use in pressurized painting equipment which is configured and arranged for joining a liquid inlet line, a pressure sensor, a filter, a pressure relief valve, and one or more liquid outlet lines by a streamlined network of passage... | 03/09/1993 |
| 5165869 | Diaphragm pump A piston-driven fluid pump including a drive chamber containing drive fluid and a drive diaphragm forming a wall of the drive chamber. The pump also includes a spill containment chamber disposed adjacent the drive chamber and containing drive fluid, with ... | 11/24/1992 |
| 5163820 | Airless sprayer with adjustable pressure unloading valve A pressure unloading valve responsive primarily to the pressure of the outlet passage in a diaphragm pump. The pump includes a driving fluid chamber and a pump chamber separated by a flexible diaphragm. Between the pump chamber and the outlet passage is a... | 11/17/1992 |
| 5106274 | Hermetic compressor A high-pressure hermetic compressor suitable for use in a zero-gravity environment. The compressor includes a solenoid, driven by a power supply, which causes a plunger to reciprocate in an internal space filled with hydraulic fluid. Such motion pressuriz... | 04/21/1992 |
| 5069602 | Fluid-powered subsurface pump A low volume, hydraulic powered pump for attachment to small diameter, coiled tubing for pumping subsurface liquids from hydrocarbon formations. The pump is easily run into existing production well tubing by use of a coiled tubing unit and then connected ... | 12/03/1991 |
| 5059099 | Integral pump housing An integral cylinder liner and pump housing formed of a die cast aluminum workpiece of the type having a surface hardness extending a minimum depth into the workpiece, the housing further includng and integral pressure vessel and pressure control valve ho... | 10/22/1991 |
| 4934906 | High pressure diaphragm pump A diaphragm pump especially suited for use in a high pressure application. The pump is devised to replenish any hydraulic fluid lost from a motor chamber, especially that fluid forced past the seals circumscribing a reciprocating plunger that is partially... | 06/19/1990 |
| 4865528 | Method and arrangement for starting an hydraulic diaphragm pump against load In a diaphragm pump, which is provided with at least one diaphragm (1), which separates a delivery chamber (4) from a pressure chamber (5) filled with an hydraulic fluid and is clmaped at its edge between the pump body (2) and a pump cover (3), and with a... | 09/12/1989 |
| 4828464 | Diaphragm pump device In a diaphragm pump including a first chamber for liquid to be pumped separated from a second chamber for drive fluid by a diaphragm which is driven by a piston alternatively placing the drive fluid under pressure and releasing the pressure from the drive... | 05/09/1989 |
| 4806082 | Fluid actuated pump with improved flow-limiting fluid refill valve An improved flow-limiting fluid refill valve for use with a fluid-actuated pump having a fluid chamber comprises a valve housing, fluid inlet means in communication with a source of hydraulic fluid and fluid outlet means in fluid communication with the fl... | 02/21/1989 |
| 4789313 | Apparatus for and method of pumping output fluids such as abrasive liquids A technique for pumping an output fluid, especially a particle-laden abrasive liquid. This technique utilizes an output pump and a drive pump which are interconnected through a common chamber containing a drive fluid, specifically water. The output pump i... | 12/06/1988 |
