Abstract: A refrigerant transfer system is provided embodying a pump for controlling the level of liquid refrigerant within a suction header of an evaporator unit. The pump includes a pair of elongated chambers in endwise relation. One chamber has a substantially greater cross-sectional area than the second chamber. Opposite ends of each chamber have port means. A first set of inlet and outlet valve means is connected to the port means at each end of said one chamber. Each inlet valve means is alternately connected to a source of pressurized fluid. A second set of inlet and outlet valve means is connected to the port means at each end of the second chamber. Each inlet valve means of the second set communicates with a lower portion of the evaporator suction header. The heads of a double-headed piston are disposed within the chambers. Control means are operatively connected to the first set of inlet valve means for controlling the direction of movement of the piston heads within the chambers.

Abstract: A four-stage gas compressor including: a double-acting piston operable by pressurized oil and provided with first and second hollow opposed piston rods the first of which is connected to a first-stage piston and the second of which is connected to a second-stage piston; said first and second-stage pistons being arranged to slide in first and second jackets respectively and being a sliding fit upon first and second cylindrical bodies respectively; said first and second cylindrical bodies respectively being fixed to first and second opposed heads; a first axial suction and delivery duct leading to an end face of said first cylindrical body, a third stage chamber being defined between said end face and one face of the double-acting piston; and a second axial suction and delivery duct leading to an end face of said second cylindrical body, a fourth stage chamber being defined between said end face of said second cylindrical body and the other face of the double-acting piston.

Abstract: A metering system for delivering and metering two combinable and cooperatable liquids, in predetermined ratios in order to enable ultimate combining of such liquids or the fluids. The apparatus comprises a first discrete valve mechanism which is capable of receiving a first fluid from a source and a cooperating first discrete metering mechanism; a pumping mechanism for receiving the fluid from and directing fluid to this first valve mechanism. The apparatus also comprises a second discrete valve mechanism capable of receiving a second fluid from a source and an associated second discrete metering mechanism; a pumping mechanism for receiving fluid from and directing fluid to this valve mechanism. An actuating device operatively connects the first and second valve mechanisms and the first and second metering mechanisms in order to enable the first metering mechanism to pump the first fluid to and from the first valve mechanism and the second fluid to and from the second valve mechanism.

Abstract: A cylindrical shell with a double acting piston, having a high pressure area and a low pressure area on each side thereof, is provided with a valve for alternately injecting high pressure gas to each small area to provide an initial piston drive, and valving for injecting gas under the pressure, opposite from the first high pressure end to the opposite larger area providing a secondary piston drive using expansion of the high pressure expanded gas from the opposite end of the piston. In reversing the piston, the opposite end becomes the drive end in the same manner. In one form, a two position slide valve, initially actuated by piston movement and completed by gas pressure movement, provides a transfer means for gas streams internally of the motor and for exhaust of the secondary expanded gas. The valve is arranged for an initial mechanical movement from one position toward the other position by contact with the end wall of the low pressure cylinder and then completely moved to other position by gas pressure.

Abstract: A downhole, hydraulically-actuated pump of the free type which is sealingly received within a cavity in such a manner that a plurality of spaced-apart annular chambers are formed. The chambers are used in conjunction with other passageways to control flow of fluid to and from the pump and the surface of the ground. This flow system provides a closed circuit for the power fluid going to and from the engine. The power fluid to the engine end flows down the tubing string within which the pump assembly is located and to which the cavity is connected. A second conduit conducts spent power fluid from the pump assembly back uphole to the surface of the ground, thereby providing a closed circuit for the flow of power fluid to and from the pump assembly. A third conduit extends from the cavity, back up to the surface of the ground, so that produced fluid from the pump end is forced to the surface of the ground.

Abstract: A diverse fluid pump assembly including a pair of parallel, reciprocating piston-cylinder, motor-pump combinations. The motor-pump combinations are oppositely arranged so that one is pumping while the other is charging. Motor reversal is accomplished through a unique, hydraulically actuated spool valve which is slaved to the common piston rods of the respective, tandem motor-pump combinations. The invention is intended for use primarily as a mud pump for oil well servicing or drilling rigs. Principal components are easily broken down for replacement because of wear and/or size considerations. In a preferred embodiment, the hydraulically actuated spool valve is hydraulically slaved to the motors to effect motor reversal. A unique floating stuffing box is provided on the motor side of each combination which accomodates lateral rod shifting while maintaining a fluid tight seal. The spool valve operates smoothly through five distinct stages during motor reversal thus eliminating any need for a pulsation dampener.

Abstract: The present invention relates to a method and an apparatus for transporting in alternating suction and displacement strokes of fluid substances, e.g., water, slurry, etc., by quanta by means of the potential energy of a primary liquid column by interposing a system of vessels sealed off from the atmosphere between the primary liquid column and the secondary fluid substance basis.

Abstract: A hydraulically-operated machine adapted to receive water at an upper level from a relatively large reservoir and to discharge the water to a lower level, which includes a piston head carried upon a piston rod mounted for vertical movement in guide bushes located above and below the piston head, inlet control valves for allowing water to flow from the upper level alternately to the upper and lower surfaces of the piston head, and outlet control valves for allowing water on the respective other side of the piston head to flow to the lower level.

Abstract: An air compressor for inflating pneumatic tires of a motor vehicle is particularly adapted to be powered by the negative pressure created at the intake manifold of the vehicle engine. The piston of a reciprocating air pump has a direct mechanical coupling with the plunger of a pneumatic cylinder assembly for driving the air pump. The cylinder assembly in turn is operated by the negative pressure of the intake manifold through a unique valve control system which automatically directs the negative pressure flow in a manner to reciprocate the plunger and hence, drive the air pump piston. In preferred forms, the plunger presents a greater operating area than the air pump piston whereby a pressure multiplying effect is provided to obtain the relatively high inflation pressures required for many pneumatic tires.

Abstract: A system for transferring a volatile liquid fuel into a tank therefor, while avoiding passage of fuel vapors into the atmosphere. Vacuum assist means is provided including a reciprocatory, fuel actuated tandem motor and pump combination, to assure maintenance of a condition in the system which will prompt removal of fuel vapors from the tank being filled.

Abstract: A self-reversing hydraulic control system for use with a device to be driven in opposite directional modes, especially a self-reversing pump driven by such a device. The system depends upon a flow sensing element disposed to sense flow associated with movement of the driven device and adapted to generate a stop signal responsive to the termination of such flow. A means responsive to the stop signal is then effective to shift the system from one directional mode to the other. Also featured is a sensor disposed to receive and transmit hydraulic fluid under pressure to drive the device, stoppage of the flow adapted to cause the sensor to shift position and to transmit pressurized hydraulic fluid pressure, as the stop signal via a hydraulic line. In preferred embodiments the self-reversing hydraulic control system has a two-position 4-way valve which is shifted in position by the hydraulic stop signal.

Abstract: A subsurface hydraulically powered pump assembly having a reciprocating pump end, a reciprocating engine end, a valve assembly for controlling the flow of power fluid to and from the engine, and a jet-type pump incorporated therewith which utilizes either the spent power fluid, or alternatively, utilizes fresh power fluid in boosting the action of the reciprocating pump. The invention comprehends utilizing the jet action to supplement the engine action at either the pump suction or the pump exhaust, thereby enabling a considerable variation in the size of the pump and engine piston, and furthermore enabling a conventional downhole reciprocating pump to move an increased volume of fluid to a greater height.

Abstract: A system for handling two liquid streams comprises an hydraulic circuit including a pair of receptacles each provided with movable partition means dividing it into first and second chambers. Rod means extending through a first chamber of each receptacle connects the partition means and is effective to cause reciprocation of one partition means to be repeated by the other so that as the first chamber of one receptacle is expanded, the first chamber of the other receptacle is contracted. A quantity of the first liquid is delivered alternately to the first and second chambers of one receptacle as those chambers expand. As those chambers contract first liquid is passed through conduit means from the first and second chambers of said one receptacle to the first and second chambers, respectively, of said other receptacle.

Abstract: A hydraulic pump assembly having a motor actuated by a source of fluid under pressure and in turn actuating a fluid pump under the control of a valve responsive to operation of the motor. The diameter of a piston of the pump is smaller than the corresponding diameter of a piston of the motor in order to permit the pump to obtain higher output pressures than are required to actuate the motor. The valve includes a valve element connected directly to the piston of the motor and slidably disposed in a pair of axially spaced, cylindrical housing parts so as to sequentially place ports provided in spaced ends of the valve element in communication with passages provided in the cylindrical housing parts.

Abstract: There is disclosed in the present application a double acting diaphragm pump including a two part hollow housing which defines two pumping chambers, one on each side of the diaphragm. A pumping stroke is imparted to the diaphragm by means of a hydraulic actuator contained within the housing and including a cylinder connected to the diaphragm and supplied with hydraulic fluid through a hollow connector which also clamps the two parts of the housing together on the margin of the diaphragm.

Abstract: In a blood dialysis system a proportioning pump accurately mixes precise quantities of water and concentrate. A double-acting piston assembly is disposed in a stepped cylinder which has proximity sensing switches at both ends thereof. These are operated as the piston assembly reaches the end of its stroke in each direction. The switches alternate a bistable solenoid valve system which directs pressurized water to opposite sides of a large central piston, thus causing the piston assembly to reciprocate. Small pistons, attached on opposite sides of the large piston, move in small pump chambers, with check valves. The small pistons pump concentrate in a precise ratio to the volume of water driving the large piston.

Abstract: A downhole, hydraulically actuated pump assembly, having an engine reciprocatingly connected to a production pump. Power fluid is conducted downhole to the engine of the pump assembly, while production fluid and spent power fluid is conducted uphole to the surface of the ground.The pump assembly includes a housing within which spaced, axially aligned, cylindrical chambers reciprocatingly receive spaced engine and pump pistons which are connected together in a manner to enable the engine to reciprocate the production pump.A mechanically actuated valve assembly is contained within the engine piston and is arranged respective to various different flow passageways so that flow of power fluid through the engine forces the engine piston to reciprocate.The valve assembly includes a control rod and a valve element concentrically arranged respective to one another and to the engine piston. The valve element is reciprocated respective to the engine piston in response to the reciprocation of the control rod.

Abstract: Agitation of the surface of a body of water by a falling stream of water results in the entrainment of air bubbles which are carried underneath the surface. These air bubbles are collected in a tank having a submerged open bottom. Air pressure is produced within the tank and utilized to perform useful work by operating a pneumatic pressure transformer which in turn produces high pressure air for operating a series of air-lift pumps. In an alternative embodiment a reciprocating piston motor or turbine is positioned in a path of flow between a portion of the body of water containing relatively few air bubbles and another portion containing a relatively large quantity of bubbles. Flow through this path takes place by reason of a difference in densities and is available to do useful work.

Abstract: A fluid-actuated, such as a pneumatically actuated, hydraulic pump of either the single acting or the double acting type is controlled in its operation by a main valve member which has two connecting compartments the fluid in one of which is always at the atmospheric, and in the other always at a superatmospheric, pressure. The main valve member has two end faces, one larger than the other, the smaller being always acted upon by the superatmospheric pressure of the fluid and the larger one intermittently. An auxiliary valve member controls the admission of the pressurized fluid to the larger end face and is open only during the reversal of the hydraulic pump from suction to pumping stroke, while the pressure acting on the larger end face is relieved during reversal from the pumping to the suction stroke. A duct communicates one or the other of the connecting compartments of the main valve member which an actuating compartment of an actuating unit, depending on the position of the main valve member.

Abstract: The invention relates to apparatus for and the method of reversing the operation of a power piston in a power cylinder automatically to pump oil, corrosive or wax bearing fluids. The flow of high pressure fluid driving the piston in one direction may be reversed to drive the piston in the opposite direction at the end of the respective strokes by establishing a collapsible chamber for the high pressure fluid within the piston. This chamber is at least partially collapsed toward the end of each stroke by the stem of an auxiliary reversing piston striking a stop slightly before the end of the stroke to partially collapse said chamber and establish a further chamber on the opposite side of the reversing piston.

Abstract: 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 connecting rod. The pistons are arranged to divide a production cylinder from an engine cylinder, so that the connecting rod is always placed in compression, thereby avoiding rod breakage. The hollow connecting rod is employed to supply power fluid to the lower engine, and the rod ends are arranged to have fluid pressure exerted thereagainst to improve the operation of the pump assembly.The production pump divides the engine into an upper and lower engine assembly so that the upper engine strokes the pump in a downward direction, while the lower engine strokes the pump in an upward direction.

Abstract: A power unit, energizable by solar heat, having a thermodynamic system including an evaporator, vapor pressure actuated motor, pump and condenser, the motor being arranged to operate upon evaporation of fluid in the evaporator, which is subsequently condensed and pumped back into the evaporator. The vapor pressure actuated motor is coupled to a hydraulic pump which in turn drives a hydraulic motor. The fluid in the thermodynamic circuit is a low temperature boiling fluid, preferably a fluoro carbon refrigerant, so that use can be made of "low grade" heat.

Abstract: A high pressure pump comprising a valve body having a first housing secured at one of its ends to one end of the valve body and having a body member secured to the other end thereof. A second housing is secured to the body member with a piston rod movably extending through the body member and the first and second housings. A first piston secured to the piston rod and movably positioned in the first housing defines first and second chambers. A second piston secured to the piston rod and movably positioned in the second housing defines third and fourth chambers. Check valve means are in communication with the third and fourth chambers and sources of fluid to be pumped. The valve body has a pilot valve therein. The pilot valve means is connected to the piston rod so that the pilot valve means will be moved from a first position to a second position when the piston rod moves from a first position to a second position and vice versa. The valve body also has a main valve therein.

Abstract: In a liquid product measuring pump driven by an air motor having air valve controls for reversing the reciprocating motion of the air motor at the end of the stroke for controlling the liquid product measuring, an adjustable stop assembly including a quickly replaceable stop bar with an extendible threaded rod therein, the rod being minutely adjustable by an insert fitting on the mounting for the stop bar.

Abstract: A two-stage pump which includes a pair of reciprocating pump members operating in opposed pump chambers and a connecting rod connecting the pump members to cause the pump members to operate in unison. Air under pressure is supplied to the chambers by a spool valve member which operates in a guide sleeve. The spool valve includes four outwardly extending portions defining a central pressure slot and a pair of exhaust slots. Ports in the sleeve communicate with the pump chambers. The spool valve is moved by pressure in pressure chambers at opposite ends of the sleeve member. The sleeve is mounted in a bore, and metering air passageways are formed between the valve sleeve and the bore and connecting the pressure chambers with the exhaust slots.

Abstract: A continuously operable piston pump for conveying of viscous materials, such as mortar mixes or the like comprises first and second chambers separated from a pressure source, such as a piston cylinder arrangement, by respective flexible wall means. The chambers are connected in series with each other. The pressure source is controlled by a further piston cylinder arrangement including a control valve at each end of the control cylinder. The control valves are operated by a flip-flop means which in turn is actuated by means directly coupling the flip-flop means to the piston rod of the control piston cylinder arrangement. The pressure piston cylinder arrangement and the control piston cylinder arrangement are constructed to have a common axis, and thus also a common piston rod located in said axis. The control valves are connected to said common piston rod.

Abstract: A fluid pressure power plant which converts heat energy, externally generated, to high hydraulic pressure. The system generates heat energy in the form of steam or hot gas, supplies the heat energy to a double-acting intensifier piston which converts the heat energy to high hydraulic pressure which is stored in an accumulator. The high pressure hydraulic energy stored in the accumulator is used to drive hydraulic motors or turbines through hydraulic output control valves. The system operates on a demand cycle in that no energy input from the heat generator and power conversion piston is necessary until there is some demand for power output from the hydraulic accumulator, once said accumulator is fully charged.