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| Number | Title | Issue Date |
| 8079831 | Submersible pump having a two-step control hydraulic valve A submersible pump includes a pump valve configured to switch the pump between first and second states in which a piston is respectively extended and retracted. The pump valve includes first and second components that reciprocate between corresponding first and seco... | 12/20/2011 |
| 8021128 | Fluid pump and motor unit A pump powered partly by a mechanical drive and partly by a pressurized fluid flow and comprised of one or more piston-in-cylinder assemblies in which one face of each piston provides a pumping action while a pressurized driving fluid flow is applied to the opposite... | 09/20/2011 |
| 7600984 | Hydraulic metering device The metering device for a liquid medium comprises a cylinder and a piston operatively disposed therein to define a metering chamber ahead of the piston. The outlet end of the cylinder is open and closed by an evacuation valve. The piston is driven forwardly through ... | 10/13/2009 |
| 7527482 | Method and apparatus for compressing a gas to a high pressure A method is provided for compressing a gas in a single cycle and in a single cylinder to a pressure of at least 17.2 Mpa with a compression ratio of at least about five to one. The method further comprises dissipating heat from the cylinder during the compression st... | 05/05/2009 |
| 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 |
| 7354190 | Two-stage mixing system, apparatus, and method A two-stage mixing system, apparatus, and method produces a solution including a first substance and a second substance in a predetermined ratio by first mixing the first substance with a first liquid to produce a first solution and then mixing the first solution wi... | 04/08/2008 |
| 7201557 | Rotary pressure exchanger A pressure exchanger for the transfer of pressure energy from a high pressure fluid stream to a lower pressure fluid stream wherein a generally cylindrical housing contains a rotor having a plurality of channels extending axially therethrough and a pair of end cover... | 04/10/2007 |
| 7153480 | Apparatus for and method of producing aromatic carboxylic acids A reactor for the oxidation of a precursor to an aromatic carboxylic acid or ester thereof in a liquid phase reaction mixture is disclosed. The reactor comprises an elongate vessel, substantially vertical in use, having an upper mixing element and a lower mixing ele... | 12/26/2006 |
| 7134849 | Molded disposable pneumatic pump A mechanical pump having a unitary construction such that the fluid being pumped is prevented from leaking without requiring the use of discrete seal elements. The absence of discrete seal elements and integral coupling of various components of the pump substantiall... | 11/14/2006 |
| 6910405 | On/off switch for liquid additive injection pump Operation of a system for injecting a predetermined amount of a secondary fluid into a primary fluid stream. The system uses a liquid additive injection pump driven by a fluid powered motor that is driven by the primary fluid stream and can be selectively suspended ... | 06/28/2005 |
| 6904973 | Downhole pump A downhole pump includes a pump barrel defining a pumping chamber having a first end and a second end, a first one-way valve positioned at the first end of the pumping chamber, a second one-way valve positioned at the second end of the pumping chamber and a plunger ... | 06/14/2005 |
| 6732646 | Pump inking unit An ink pump for a punp inking unit of a rotary printing press utilizes a two piece coupling between the ink pump and an ink pump drive unit. The ink pump is part of a replaceable inking unit while the ink pump drive unit is supported in the frame of the press. The t... | 05/11/2004 |
| 6655931 | Peristaltic compressors suitable for relaxation-free compression of polarized gas A peristaltic compressor suitable for relaxation-free compression of polarized gas including a pumping rotor driven by a motor provided with a plurality of rollers, and at least a tube, wherein the rotor and the tube(s) is(are) placed in a depressurized c... | 12/02/2003 |
| 6540487 | Pressure exchanger with an anti-cavitation pressure relief system in the end covers A pressure exchanger for simultaneously reducing the pressure of a high pressure liquid and pressurizing a low pressure liquid. The pressure exchanger has a housing having a body portion; with end elements at opposite ends of the body portion. A rotor is ... | 04/01/2003 |
| 6537039 | Hydraulic drive portable air compressor system A portable high capacity air compressor system comprises an air compressor with a hydraulic motor coupled thereto to form a compact compressor unit, and a removable air reservoir which is releasably attached to the compressor unit.... | 03/25/2003 |
| 6364633 | Internally ported hydraulically actuated down-hole pump A hydraulically actuated down-hole pump formed as a vertically elongated tubular structure having an engine outer tube that receives a reduced external diameter engine cylinder providing an annular power fluid passageway there between with an engine pisto... | 04/02/2002 |
| 6129525 | Speed control for fluid powered diaphragm pumps A governor for fluid powered diaphragm pumps is shown and described. At least one pump member or oscillatory member moves in response to the varying pressures in the inner chambers of the diaphragm pump. Thus, each pump member or oscillatory member moves ... | 10/10/2000 |
| 6099274 | Pump to surface pump A reciprocating pump is provided for pumping subterranean fluids containing fine solids to surface. The pump comprises a pump barrel, piston and piston rod. The piston rod is suspended form reciprocating production tubing. The barrel is anchored in the ca... | 08/08/2000 |
| 6059546 | Contractile actuated bellows pump A pump for impelling a fluid includes a first variable volume, the first variable volume having a first inlet for allowing the influx of the fluid into the first variable volume and a first outlet for allowing the efflux of the fluid out of the first vari... | 05/09/2000 |
| 6029688 | Water wheel for pumping chemical treatment into water stream The invention is a water wheel supplying energy to a pump. The pump will typically be used to apply chemical treatments to the water stream. Some examples of chemicals to be added are acids or bases to bring the pH to an acceptable level, precipitation ai... | 02/29/2000 |
| 6004114 | Hydraulic submersible pump for oil well production A flow control assembly is provided for a submersible pump drive which has a hydraulic drive motor and a bearing pack for sealing a drive shaft which transfers drive from the drive motor to an oil well pump. The flow control assembly incorporates a produc... | 12/21/1999 |
| 5984646 | Hydraulic motor for use with airless paint sprayer system A reciprocating hydraulic motor and pump assembly includes a cylinder and a piston disposed for reciprocation in the cylinder. The piston includes a stem having a bore extending longitudinally in the stem and a piston head connected to one end of the stem... | 11/16/1999 |
| 5827051 | Regenerative hydraulic power transmission for down-hole pump Regenerative hydraulic power transmission for subsurface pumps, including a power source, a variable flow rate hydraulic pump, means to reverse flow through the hydraulic pump responsive to change in direction of the subsurface pump stroke, and an inertia... | 10/27/1998 |
| 5807082 | Automatic downhole pump assembly and method for operating the same An automatic downhole pump assembly comprising a housing, a sleeve slidably disposed within the housing, a piston defining an interior volume, the piston slidably disposed within the sleeve and within the housing such that a fluid pressure within the inte... | 09/15/1998 |
| 5651666 | Deep-well fluid-extraction pump This invention features a small-enveloped (with an outside diameter of at least approximately 38 mm), single-acting, hydraulically-operated, reciprocating, deep-well, fluid-extraction pump, operable in non-straight and angular wells, and its mode of opera... | 07/29/1997 |
| 5607289 | Underwater excavation apparatus This disclosure relates to an underwater excavation apparatus comprising a tube in which a propeller is mounted for rotation. The tips of the propeller blades are formed with jets supplied from a high-pressure water supply through passages in the propelle... | 03/04/1997 |
| 5498141 | Hygienic tank lorry pump and tank truck A hygienic tank truck pump for pumping liquid articles of food, such as milk, from either a stationary tank to the tank of a tank truck or between the tank truck and a tailer trunk coupled to the tank truck. The hygienic pump includes a side channel pump,... | 03/12/1996 |
| 5480291 | Underwater excavation apparatus The disclosure relates to an underwater excavation apparatus comprising a tube (10) in which a propeller (18) is mounted for rotation. The tips of the propeller blades are formed with jets (30) supplied from a high pressure water supply through passages i... | 01/02/1996 |
| 5366353 | Air valve with bleed feature to inhibit icing The air valve on a reciprocating pneumatic pump bleeds air from the pressurized air chamber into the exhaust port through a hole in the valve cup in order to warm the exhaust port area and prevent ice build up in the area. Such construction is also suited... | 11/22/1994 |
| 5320500 | Continuous mixing device, method and use in an installation for pumping a high viscosity fluid The invention concerns a continuous mixing device (1) having a rotating shaft (4) fitted with blades (7, 7a). The mixture obtained at the outlet from the mixer results from admitting to the mixer a high-viscosity fluid (22) and at least one fluid of a low... | 06/14/1994 |
| 5286175 | Dye injection apparatus for a fuel terminal Apparatus for injecting dye in a fuel flow line is disclosed. The apparatus includes a fluid powered motor adapted for placement in a fuel flow line, a dye reservoir and a fluid injector connected between the reservoir and the flow line and driven by the ... | 02/15/1994 |
| 5249645 | Pressure fluid actuated lubricator A pressure fluid actuated lubricator having a housing (46), a pressure fluid channel (43, 42, 21) leading from an inlet opening (2) to an outlet opening (7), a reservoir (44) for a lubricant and a discharge device (19) for the lubricant. The reservoir (44... | 10/05/1993 |
| 5220943 | Internal pump assembly An internal pump assembly including a fluid tank defining a fluid compartment, and first and second vessels positioned in the tank. The second vessel has a second vessel port through which fluid can flow relative to the fluid compartment. A bellows pump a... | 06/22/1993 |
| 5062770 | Fluid pumping apparatus and system with leak detection and containment A fluid pumping apparatus and system including a double acting diaphragm pumping device in which each pumping component has a pair of spaced apart diaphragms defining a containment chamber and all exposed surfaces in the pumping chamber and the containmen... | 11/05/1991 |
| 4995304 | Extendable cylinders of elastically variable length for use in a pump An extendable cylinder of elastically variable length and substantially invariable circular cross section is combined with another such extendable cylinder or a movable separating organ to form an operating unit. One of the extendable cylinders of the ope... | 02/26/1991 |
| 4955585 | Hydraulically driven fan system for water cooling tower An energy conserving highly efficient hydraulically energized cooling tower fan system is provided having a rotary fan and hydraulic motor for operation thereof located at elevation within the upper portion of a cooling tower. An axial piston, variable di... | 09/11/1990 |
| 4921408 | Non-icing quiet air-operated pump A silencing system is provided for an air-operated pump which also eliminates icing of the pump at higher cycle rates and humidities. The exhaust from the air motor powers an air flow inducer to induce a flow of relatively warm ambient air. The induced fl... | 05/01/1990 |
| 4783961 | Natural gas pressure differential energy recovery system An energy recovery system is disclosed for recovering energy of highly pressurized natural gas when it is depressurized prior to distribution. The system includes a processing vessel which defines a bounded volume. The vessel is partially filled with wate... | 11/15/1988 |
| 4784582 | Fluid dispensing pump A pneumatically operated pump for dispensing controlled shots of paste material includes a disposal paste syringe tube having a ferrule with an axial dispensing hole centered in the bottom. An axial movable plunger extending through the length of the syri... | 11/15/1988 |
| 4743175 | Reel assembly for dewatering apparatus A dewatering pump assembly including a rotatably supported reel about which a flexible conduit is wound and which passes from the reel through a driven roller assembly to be attached at one end to a hydraulically driven pump assembly which is lowered into... | 05/10/1988 |
