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Class Information
Number: 417/403
Name: Pumps > Motor driven > Fluid motor > Rectilinearly reciprocating cylinder and piston-type motor > Rectilinearly reciprocating cylinder and piston-type pump > Integral pump and motor pistons > Double acting motor piston
Description: Apparatus in which the motor piston cooperates with a single continuous motor cylinder to divide same into a pair of opposed expansible working chambers, there being means provided for controlling the supply or exhaust of motive fluid to or from each of said opposed working chambers to drive the motor piston in opposite directions.










Sub-classes under this class:

Class Number Class Name Patents
417/404 Double acting pump piston 101


Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8632322 Plunger pump with atmospheric bellows Jan. 21, 2014
8277653 Power recovery chamber Oct. 2, 2012
8231362 Multi-chambered pump Jul. 31, 2012
8161741 System and methods for optimizing efficiency of a hydraulically actuated system Apr. 24, 2012
7740455 Pumping system with hydraulic pump Jun. 22, 2010
7604064 Multi-stage, multi-phase unitized linear liquid entrained-phase transfer apparatus Oct. 20, 2009
7559438 Multiple component metering and dispensing system Jul. 14, 2009
7438537 Liquid additive injection pump with mixing chamber and one way valve Oct. 21, 2008
7431572 Hydraulic oil well pumping installation Oct. 7, 2008
7354252 Pressure intensifier Apr. 8, 2008
7322802 Thick matter pump comprising a conveyance capacity control system Jan. 29, 2008
7284475 Pneumatic reciprocating motor Oct. 23, 2007
7284961 Pumping system, replacement kit including piston and/or cylinder, and method for pumping system maintenance Oct. 23, 2007
7226274 Cement slab leveling apparatus Jun. 5, 2007
7134847 Hermetic electric compressor having a suction muffler Nov. 14, 2006
7071429 Linear adjustment operator for pressure control of paint pumps Jul. 4, 2006
6929454 Thick matter pump Aug. 16, 2005
6821096 Multiple component metering and dispensing system Nov. 23, 2004
6736612 Pump May. 18, 2004
6729860 Pneumatically driven liquified gas booster pump May. 4, 2004
6712587 Hydraulic amplifier pump for use in ultrahigh pressure liquid chromatography Mar. 30, 2004
6676386 Oilless air motor assembly for hydraulic pumps Jan. 13, 2004
6676387 Metering pump with a rotary valve responsive to electrical signals from the contact between a fluid responsive shuttle and dual probes Jan. 13, 2004
6623254 High pressure water pump Sep. 23, 2003
6589027 Double acting reciprocating motor with uni-directional fluid flow Jul. 8, 2003
6582205 Fluid motivated grease/water pumping and separating system Jun. 24, 2003
6511302 Slurry piston pump with cylinder cleaning apparatus Jan. 28, 2003
6503066 Hydrostatic pressure test pump Jan. 7, 2003
6499968 Integral pump and control valve Dec. 31, 2002
6491882 High-pressure device Dec. 10, 2002
6485272 Fluid proportioner Nov. 26, 2002
6478552 Fluid motivated pump Nov. 12, 2002
6435843 Reciprocating pump for feeding viscous liquid Aug. 20, 2002
6422840 Hydraulic displacement pump having two stroke length Jul. 23, 2002
6409482 Double-force type pressure cylinder structure Jun. 25, 2002
6398527 Reciprocating motor with uni-directional fluid flow Jun. 4, 2002
6375432 Pipeline air pocket detection system Apr. 23, 2002
6299416 Bulk material pump device Oct. 9, 2001
6295914 Pressure intensifier for fluids, particularly for hydraulic liquids Oct. 2, 2001
6267568 Diaphragm pump Jul. 31, 2001
6267571 Hydraulic displacement pump having two stroke length Jul. 31, 2001
6183217 Pilot control valve for controlling a reciprocating pump Feb. 6, 2001
6155806 Dual acting piston pump having reduced back flow between strokes Dec. 5, 2000
6152706 Pneumatic pump and control means therefor Nov. 28, 2000
6129525 Speed control for fluid powered diaphragm pumps Oct. 10, 2000
6129526 Metering pump having a tubular seal for sealing a main liquid from an auxiliary liquid Oct. 10, 2000
6116865 Water box for a thick matter piston pump having two sides of access Sep. 12, 2000
6086338 Water jet intensifier pump having a piston arrangement with a ceramic liner Jul. 11, 2000
6077053 Piston type gas compressor Jun. 20, 2000
5951265 Fluid driven reciprocating engine or pump having overcenter, snap-action mechanical valve control Sep. 14, 1999

1 2 3 4










 
 
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