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Document |
Document Title |
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7367785 |
Reduced icing valves and gas-driven motor and reciprocating pump incorporating same
A valve for a gas-driven motor and a valve assembly and reciprocating pump incorporating the valve are provided. The valve includes a shiftable valve for alternatively supplying a motive gas...
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7025578 |
Pump having air valve with integral pilot
A pump comprising a valve housing and a spool slidably positioned within the valve housing. The spool has a supply face, a first end face, and a second end face, and is slidable between a first...
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6962487 |
Fluid driven pump with improved exhaust port arrangement
A fluid driven pump. One embodiment of the fluid driven pump may include first and second diaphragms supported within a housing assembly such that first and second fluidtight expansion chambers are...
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6962175 |
Pilot valve operated reciprocating fluid exchange device and method of use
This invention provides a fluid system for exchanging used hydraulic fluid with fresh hydraulic fluid in an accessed hydraulic circuit. One particular application provides an exchange apparatus for...
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6685443 |
Pneumatic reciprocating pump
A pneumatically-actuated reciprocating fluid pump and shuttle valve combination operates in an “air-assist” mode and a “non-air-assist” mode. In the non-air-assist mode, the shuttle valve...
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6561774 |
Dual diaphragm pump
A dual diaphragm pump comprises a first chamber, a second chamber, a mechanical link, and a drive mechanism. The first chamber comprises a first cavity and a first diaphragm. The first chamber...
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6474961 |
Compact dual diaphragm pump
A dual diaphragm pump includes a central housing having a pair of opposed housing surfaces, each surface having a housing diaphragm recess and a pair of housing valve recesses, and a pair of...
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6280149 |
Active feedback apparatus and air driven diaphragm pumps incorporating same
A diaphragm pump having an active feedback system is provided. The diaphragm pump includes a diaphragm pump having a housing including a pumping cavity. The pump cavity having at least one...
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6241487 |
Fluid powered diaphragm pump
A fluid powered diaphragm pump is provided which includes three means for supplementing the pilot valve signal to the main fluid valve spool. The means include a cross porting of the main fluid...
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6223790 |
Auto-Loading fluid exchanger and method of use
This invention provides a fluid system for exchanging used hydraulic fluid with fresh hydraulic fluid in an accessed hydraulic circuit. One particular application provides an exchange apparatus for...
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6168387 |
Reciprocating pump with linear displacement sensor
A reciprocating pump having an active feedback system is provided. The reciprocating pump includes a reciprocating pump having a pump chamber with a rod reciprocally movable along a longitudinal...
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5616005 |
Fluid driven recipricating apparatus
An apparatus comprising a pair of fluid driven pump assemblies in a back-to-back configuration to yield a bi-directional pump. Each of the pump assemblies includes a piston or diaphragm which...
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5584666 |
Reduced icing air valve
Provision is made for an air control valve to bypass the ice forming exhaust of a reciprocating pressure activation chamber in a reciprocating double diaphragm pump utilizing the supply pressure to...
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5567118 |
Non-lubricated, air-actuated, pump-operating, shuttle valve arrangement, in a reciprocating pump
A pilot spool is interposed between the compressed air supply and the diaphragm pump-operating main spool, to insure that, at any one time, only one end of the bore in which the main spool...
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5551847 |
Lost motion pilot valve for diaphragm pump
A mechanical shift pilot valve is provided with lost motion response to accommodate slight piston reversals at travel limits to prevent a false shift signal related thereto.
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5527160 |
Mechanical shift, pneumatic assist pilot valve
A pneumatic assist valve receives constant air pressure from supply air to provide the pneumatic assist to shift the pilot, eliminating false signals acting on the trip rod and the design also...
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