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8123495 |
Reciprocating positive-displacement compressors
A positive-displacement reciprocating compressor comprising a “non-conventional” crank mechanism which eliminates the amount of frictional force between the wall of the piston and the wall of the...
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8083504 |
Quintuplex mud pump
A quintuplex mud pump has a crankshaft supported in the pump by external main bearings. The crankshaft has five eccentric sheaves, two internal main bearing sheaves, and two bull gears. Each of the...
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7819636 |
Air pump with improved air intake control structure
An air pump operably by a motor to pump air is disclosed to include a body, an airbag unit, which is mounted in the body has multiple airbags each having an air chamber and an air inlet, a lifting...
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7614251 |
Reciprocating compressor and refrigerator having the same
Disclosed are a reciprocating compressor and a refrigerator having the same. The reciprocating compressor comprises a casing, one reciprocating motor mounted at a frame unit provided in the casing...
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7604064 |
Multi-stage, multi-phase unitized linear liquid entrained-phase transfer apparatus
An apparatus capable of receiving oil and gas from a recovery or other input source, compressing and/or pumping said oil and gas using multi-phase compressors with heat exchange means, and...
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7566206 |
Linear compressor for multi-stage compression
A linear compressor for multi-compression includes a stationary cylinder, a moving piston, and a stationary piston. The stationary cylinder has a first compression chamber formed therein. The...
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7390173 |
Well fluid pumping arrangement
A liquid well pumping arrangement, especially for oil wells, comprising a pair of adjacent downhole reciprocating pumps each having a barrel, a piston rod connected to a piston slidable within the...
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7029241 |
Circumferential piston compressor/pump/engine (CPC/CPP/CPE); circumferential piston machines
A rotary piston machine includes a first spheroidal element including pistons and/or cylinders and a second spheroidal element including pistons and/or cylinders, wherein the first element can move...
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6832900 |
Piston mounting and balancing system
A compact 180° opposed piston pump/compressor minimizes axial spacing between its pistons on the drive shaft and thereby reduces the shaking couple and noise from reciprocation. Each piston has ...
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6817846 |
Gas compressor and method with improved valve assemblies
A gas compressor and method according to which a piston assembly reciprocates in a bore to draw the fluid to be compressed into the bore during movement of the piston unit in one direction and to...
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6814548 |
Multiple piston engine with vibration reducing properties
The invention relates to a piston engine which is essentially comprised of an engine shaft and a set of modules, each of which comprises a cylinder and a piston powered by the engine shaft in the...
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6764287 |
Pump provided with diaphragms
A casing body is formed with a vent hole. The casing body has an inner face formed with a plurality of grooves respectively communicated with the vent hole. A plurality of diaphragms are...
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6702556 |
Multi-cylinder compression pump
The invention concerns a pump for compression of gases, such as air, of the type comprising a first cylinder and a second cylinder, a piston dividing said first cylinder into a first chamber...
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6655935 |
Gas compressor comprising a double acting piston, an elongate chamber, multiple inlets mounted within heads on both sides of the chamber, and one central outlet
A gas compressor and method according to which a plurality of inlet valve assemblies are angularly spaced around a bore. A piston reciprocates in the bore to draw the fluid from the valve...
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6634867 |
Shuttle piston assembly with dynamic valve
A portable, high capacity air compressor system for charging air tanks over wide pressure ranges with maximum volumetric efficiency is characterized by employing a shuttle piston assembly in which...
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6190142 |
Manual air pumps having selectable high pressure and high pressure modes
A manual air pump includes an outer tube and an inner tube coaxially mounted in the outer tube. An inner chamber is defined in the inner tube. An outer chamber is defined between the outer tube and...
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6155806 |
Dual acting piston pump having reduced back flow between strokes
A dual acting pump for dispensing pressurized liquids including a pump housing, a reciprocating pump shaft contained in a pumping chamber and at least one spring-biased check valve member. In the...
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6071096 |
Pneumatic cylinder, in particular for actuating fume extraction valves in fume and heat extraction plants
A pneumatic cylinder for actuating fume extraction valves in fume and heat extraction plants has a piston (2) that may be actuated from both sides with at least one working surface and that can be...
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6030185 |
Radial piston pump
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5980222 |
Hermetic reciprocating compressor having a housing divided into a low pressure portion and a high pressure portion
A compressor assembly includes a compressor mechanism mounted within a hermetically sealed housing. The housing is effectively divided into a low pressure area at a relatively low temperature and a...
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5975864 |
Pump with self-reciprocating pistons
A pump for providing a pressurized fluid flow. The pump includes a pump casing that defines a pump chamber. A pump shaft is has a head end in the pump chamber; the head end has a circumferential...
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5816787 |
Motion conversion rotator apparatus and method
A method and apparatus to convert the torque of a drive shaft into reciprocating energy to drive and pull a piston utilizing a nodal rotator attached to the drive shaft, or alternatively to convert...
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5727930 |
Valves and rod assembly
A hollow through-bolt is threaded internally and externally, at one end, to receive therein a reciprocable, end-threaded rod. A pair of fluid-control valves, centrally bored, are mounted on the...
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5651302 |
Actuator pump
An actuator pump has one or more colinear piston cylinders (2, 3, 25) in a cylinder housing (1) in which change of volume is provided by reciprocative relationship of colinear pistons (4, 5, 23,...
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5628625 |
High pressure fluid pump for use in vehicular braking system having anti-lock and traction assist feature
A pump for a vehicle braking or traction control system integrated into a hydraulic control unit. The housing for the hydraulic control unit has at least one counterbore in which a cylindrical...
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5494410 |
Manually operable vacuum pump
A manually operable vacuum pump having a housing including first and second pump chambers whose volume is altered by movement of a displaceable piston which is moved by means of a piston rod...
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5370504 |
Ambulant reciprocating compressor having plural pressure collection chambers
A pair of oppositely directed pistons are reciprocatingly mounted in a cylinder. The cylinder is formed unilaterally with and encapsulated within a tank for receiving compressed air and has an...
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5213482 |
Hydraulic radial-type piston pump
A radial piston pump is described with dual pistons which are slidingly accommodated within a bushing coupled end to end to a valve body. Automatically controlled suction and discharge valves for a...
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5141413 |
Gas compressor having a variable-volume clearance pocket, and means for varying a clearance pocket in a gas compressor
The compressor has a straight cylinder wholly confined within which are inlet valves, and reciprocatable discharge valves. One inlet valve is set in place by a centerbolt which can be turned by a...
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5100305 |
Reciprocating piston pump
The invention is directed to improving the performance of a reciprocating piston pump in terms of noise. The reciprocating piston pump has a drive shaft, which has a circular cylindrical swash...
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4842492 |
Compressor discharge muffler having cover plate
A hermetically sealed scotch yoke compressor assembly is disclosed wherein a crankcase includes annular channels formed on the top and bottom surfaces thereof defining muffling chambers. Gas...
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4755112 |
Water/air pumping system
The present disclosure is directed to a water/air pumping system comprising essentially a substantially flat primary reservoir, a header tank and a pump. At least one reciprocating piston is...
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4443162 |
Fluid pump
A fluid pump having manually operable and power operable sections 10a, 10b mounted within a unitary pump body 12 that defines at least one suction and one discharge port 14, 16. The manually...
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4115041 |
Pumps
A pump comprising a body having at least one chamber and preferably two axially spaced and aligned pumping chambers, each such pumping chamber communicating at opposite ends respectively with a...
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4084923 |
Double-acting, downhole pump assembly
A downhole, hydraulically actuated pump assembly of the free or fixed type which includes a control valve positioned above the engine, and a plurality of pistons connected together by a hollow...
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3768927 |
FLUID PUMPING APPARATUS
In one aspect a hydraulic pump unit comprises fluid pumping apparatus having a pair of axially aligned cylinder and piston units, wherein the cylinder body is movable independently of the piston,...
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3685923 |
AUTOMOTIVE AIR CONDITIONING COMPRESSOR
In preferred form, a four cylinder radial compressor which is operated by an eccentric slider drive mechanism. Two pairs of cylinder bores are radially spaced 90° apart with the center lines of ...
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3461866 |
MANUALLY OPERATED ARTIFICIAL RESPIRATOR
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3407746 |
High pressure piston pump
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3384029 |
Hydraulic pumping apparatus
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3167019 |
Dual zone pumping apparatus
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3084630 |
Apparatus for use in pumping wells
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2921531 |
Pressure fluid-operated pump structure
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2910002 |
Two zone pumping
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2804018 |
High and low pressure fuel system
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