Abstract: A pneumatic fan containing a revolving wheel, which has a circumference, first and second stepped fillets at both axial ends thereof, and a rotary main shaft extending from the stepped fillets. The circumference is provided with a plurality of axially extending slots. The pneumatic fan further contains a plurality of impellers which are slidably received by the axially extending slots, each of the axially extending slots having a depth greater than the height of the impellers. Two shaft bearing seats are provided to receive the rotary main shaft at two axial ends thereof. The revolving wheel including the impellers are enclosed in a cylindrical motor seat having an entrance port for receiving air and an exit port for exiting air. The revolving wheel is disposed eccentrically relative to the motor seat, and the motor seat and the rotary main shaft have a point of contact, such that the entrance port and the exit port are disposed equidistantly from, and at opposite sides of, the point of contact.

Abstract: A pumping apparatus has a linear electric motor (10; 40) reciprocally driving motor pistons (16; 45) hydraulically coupled with pump pistons (25) or with coupling pistons (51) mechanically connected with pump pistons (61) which move the fluid to be pumped. For undersea use, the coupling arrangements allow convenient separation and retrieval of subassemblies requiring relatively frequent servicing.

Abstract: A pressure testing apparatus including a twin cylinder accumulator assembly having a first cylinder and a first piston dividing the first cylinder into first and second chambers. The first chamber communicates with a test specimen and contains a first fluid. The twin cylinder accumulator assembly also includes a second cylinder coaxial with the first cylinder and a second piston which divides the second cylinder into third and fourth chambers and which is connected to the first piston by a common piston rod. The fourth chamber communicates with a hydraulic pressure unit and is supplied with alternating high and low pressures to cyclically pressurize the first fluid in the fourth chamber and the test specimen communicating therewith. A switch actuator is mounted on the piston rod for actuating first and second proximity sensors to monitor piston rod movement.

Abstract: A car air conditioner having an air-conditioning circuit for cooling an atmospheric air in a car compartment by a refrigerant gas compressed by a refrigerant compressor driven by an oil hydraulic motor. An axial shaft is extended commonly through both the compressor and oil hydraulic motor to connect the refrigerant compressor in tandem to the oil hydraulic motor, to thereby transmit a drive force of the oil hydraulic motor to the refrigerant compressor. The oil hydraulic motor is operated by an oil under pressure delivered through a flexible oil hose from an oil hydraulic pump driven by a car engine.

Abstract: A control system for a pump for thick materials in which the pump has a hydropump with a delivery-volume regulator for adjusting the delivery volume of the hydropump in response to a setpoint signal. A baffle member is coupled between the delivery cylinders of the pump and a delivery line, and a reversing member is coupled to the baffle member for reversing the baffle member to alternately couple the delivery cylinders to the delivery line and to a material dispenser container. A sampling device responsive to the end of the pressure stroke of the delivery cylinders transmits an end-position signal for initiating the reversal of the baffle member by the reversing member. A switching member is coupled by an output to the delivery-volume regulator of the hydropump and coupled by an input to the sampling device for receiving the end-position signals and for transmitting setpoint signals to the delivery-volume regulator.

Abstract: The present invention relates to a hydraulic pump system comprising:(a) a variable displacement pump;(b) an engine used to drive the variable displacement pump;(c) a power takeoff unit for engaging or disengaging the engine from the variable displacement pump;(d) a hydraulic motor driven by the variable displacement pump via hydraulic fluid pressure;(e) a liquid pump driven by the hydraulic motor;(f) a hydraulic fluid cooler in communication with the hydraulic motor;(g) a hydraulic fluid reservoir in communication with the cooling means and the inlet the variable displacement pump;(h) hydraulic piping and/or hose for connecting the hydraulic motor, cooler, reservoir and variable displacement pump; and(i) filters located within the hydraulic piping and/or hose.

Abstract: Apparatus for periodically drawing accumulated sludge (12) from a settlement tank (10) includes a hydraulically powered ram type positive displacement pump (14), operation thereof being controlled automatically in a timed or other sequence in response to signals derived from a pressure transducer (34), conveniently in the hydraulic supply line (24), said signals being a function of the pressure exerted by the pump ram (22) in operation and hence the density or other properties of the material being handled by the pump, a higher pressure showing the presence of sludge and a lower pressure its absence.

Abstract: Apparatus and method for pumping fluid from a wellbore using a reciprocating downhole pump, the downhole pump being reciprocated by a pumping unit which employs a hydraulic power cylinder means, the power cylinder being actuated with a variable displacement hydraulic pump.

Abstract: An improved method and apparatus wherein hydraulic fluid movement is initiated by an electrical linear motor.

Abstract: An electro-hydraulic position-servo device to quickly and accurately position a stop element is provided for use with a positive displacement fuel injection system, wherein a shuttle is used to positively displace pre-metered slugs of fuel to unit injectors. The stop device is operatively associated with a control shaft having at least one helical surface thereon; the stop element and control shaft slidably located within a housing. The housing permits communication between at least one pressurized fluid source and a drain line by way of a chamber within which the control shaft is located. Thus, by simply rotating the control shaft from rotational drive means, the control shaft will assume an axial position determined by the orientation of the helical surface with respect to the supply and drain lines. The device is adjustable by rotation of the shaft to a new position with the re-orientation of the helical surface.

Abstract: A device for controlling the flow of foam which uses a piston-cylinder arrangement to receive foam at the rapid flow rate of a foam generator until the cylinder is substantially full of foam and then to dispense the foam at a lower flow rate by using the piston to gradually push the foam out of the cylinder.

Abstract: A low volume, hydraulic powered pump for attachment to small diameter, coiled tubing for pumping subsurface liquids from hydrocarbon formations. The pump is easily run into existing production well tubing by use of a coiled tubing unit and then connected to a power fluid pressuring apparatus. Power fluid actuates an actuator in the pump to pump liquids in the formation to the surface. The actuator has two piston heads connected by a connector rod which reciprocate in two separate chambers in the pump which are divided by a cross head seal member. A conduit in the actuator allows power fluid to be forced into the lower chamber to drive the actuator downward pumping subsurface liquids to the surface. Once the actuator completes its down stroke, pressure on the power fluid is released and the actuator is driven to its retract position by the hydrostatic pressure of the subsurface liquids pressing against the bottom surface of the upper piston head.

Abstract: An injection molding apparatus where the position of the auger can be accurately determined from the position of the electric linear motor. The electric linear motor is in direct communication with a first hydraulic piston and cylinder. The first hydraulic piston and cylinder is in hydraulic communication with a second hydraulic piston and cylinder. The second hydraulic piston and cylinder is in direct communication with the auger. Thereby, the position of the auger can be accurately controlled by controlling the position of the electric linear motor.

Abstract: Vertical reciprocation of the piston in a downhole well pump is hydraulically effected by surface-disposed power transfer apparatus comprising a driving fluid housing divided into first and second chambers by a drive piston reciprocably disposed therein, the first chamber being connected to the driving fluid chamber of the well pump by a driving fluid pipe. The pipe and the first housing chamber are filled with a first driving fluid. A driving fluid pump has an outlet connected to the second housing chamber, and an inlet connected to a source of a second driving fluid.

Abstract: A double-acting diaphragm pump system for pumping and spraying materials, particularly corrosive liquids and abrasive fluids. The system includes a hydraulically driven double-acting diaphragm pmup which is electrically controlled for alternately pumping material through the dual pump chambers to an outlet pipe. The diaphragms of the double-acting pump are moved back and forth by a dual-acting hydraulic cylinder powered by a hydrostatic transmission for providing automatic response to pumped fluid needs, coupled with overpressure protection. An expansion tank maintains a constant pressure on the fluid as it is discharged from the pump. The system is capable of spraying abrasive slurries of a wide variety, at an even spray pattern, as the system wears, and hardened wear rings around the inlet and outlet valves permit the pump to be inexpensively rebuilt after extended use pumping abrasive slurries.

Abstract: A pumping system for shipboard use is comprised of a submersible centrifugal dewatering pump driven by a high pressure hydraulic motor mounted directly on the submersible pump, a hose means being connected from the hydraulic motor to a hydraulic pump located up on deck and arranged to be driven by an engine-driven standby fire pump. Quick couple-disconnect couplings are provided so that the pumping system can be operated in a dewatering mode, a fire fighting mode or a mode in which the pumping system supplies a source of power for operating various emergency power tools in holds or under water. Another pumping system has a discharge line from a fire pump arranged to drive a water motor mounted on a submersible pump for driving the same.

Abstract: A downhole well pump system comprises a reciprocating piston pump disposed in a fluid conduit in a wellbore which is filled with a driving fluid having a density preferably greater than the production fluid being pumped. The pump cylinder has a transverse partition and a piston assembly including an elongated piston rod extending through the partition and connected at its opposite ends to spaced apart pistons. The pump pistons and the cylinder partition divide the cylinder into a production fluid intake chamber, a production fluid transfer and delivery chamber, a driving fluid chamber and a second production fluid delivery chamber. Production fluid is conducted to the surface through a production fluid conduit disposed coaxial within the driving fluid conduit.

Abstract: A pilot control valve comprising an elongated valve member shiftable within a valve body between a first and a second position. The first position allows communication of control fluid to a first pressure receiving surface to initiate movement of the valve member from its first position to a position equalizing the pressure acting on a second pressure receiving surface with the pressure of the control fluid, thereby causing the valve member to move to its second position. The valve member when in its second position allows communication with a third pressure receiving surface for initially moving the valve member from its second position while equalizing the pressure acting on the second pressure receiving surface to move the valve member to a position equalizing the pressure acting on the second pressure receiving surface with a pressure lower than the pressure of the control fluid for moving the valve member to its first position whereby the operation is repeated at infinitum.

Abstract: A control arrangement for hydraulic drives for driving piston pumps includes a control piston which is switchable between its end positions. The control piston has reciprocably effective longitudinally-extending flow restrictors connected into the power lines of the hydraulic drive and the control valves corresponding to each flow restrictor are provided with a pressure balancer. The direction of flow of the hydraulic fluid is the same through all flow restrictors in all switching positions of the control piston. The pressure balancer is controlled by the drop in pressure across the flow restrictor corresponding thereto. The outlet of the control valve for the hydraulic fluid flowing to the hydraulic drive and the inlet for the hydraulic fluid flowing away from the hydraulic drive are connected together at a common connecting terminal of the hydraulic drive.

Abstract: An electropneumatic converter is provided comprising a gear pump. The two othed wheels are driven by two electric motors rotating at high speed in opposite directions. The control circuits for each of the motors are independent and a single motor may drive the pump permanently.The converter is used, for example in an activator for a cardiac module or artificial heart.

Abstract: A redundant, pneumatic driver for a blood pump in which a pair of pistons are contained in a common cylinder and their stroke rates and lengths are selectively controlled by a controller which non-invasively senses the circulatory system requirements of the patient in which the blood pump is implanted. The controller varies the stroke rates and lengths to meet such requirements and further is able to selectively switch driving functions from one piston to the other to provide a redundant driving capability.

Abstract: A hydraulically powered compressor has infinitely variable capacity control through use of a variable displacement hydraulic pump, and a hydraulic control and power system provides the infinitely variable capacity control with a proportionate change in required power. Components may be mounted in an air duct.

Abstract: A pumping apparatus (10) is disclosed which includes a downhole reservoir unit (20), a pumping unit (18) and a power unit (102). The reservoir unit (20) has a piston assembly (70) with a top piston (72) and a bottom piston (74). A storage chamber (82) is defined between the two pistons (72, 74) which is variable in volume as the piston assembly moves from the rest position to a pumping position where a helical spring (98) is compressed. The piston assembly (70) is moved by fluid in a tubing string (22) through reciprocal motion of a pulser piston (48). As the piston assembly (70) is moved downwardly, fluid from the reservoir passes through a check valve into the storage chamber (82). When the piston assembly (70) is in the pumping position, the pulser piston (48) is retracted and the helical spring (98) drives the piston assembly (70) upward. The volume of the storage chamber (82) decreases and fluid is pumped from the storage chamber through the tubing string to the surface.

Abstract: The present invention relates to a slurry pumping apparatus for solid-liquid separation. More specifically, the invention provides, in a slurry pumping apparatus arranged such that a diaphragm pump connected to an oil tank is actuated to deliver a hydraulic oil when a predetermined amount of slurry is supplied from a slurry tank to a solid-fluid separator, such as a filter press, which obtains cake from slurry, a slurry pumping apparatus for solid-liquid separation in which the diaphragm pump has its hydraulic pressure chamber connected to a supply/discharge pump through a changeover operation of a change-over valve such that the slurry is pumped to the solid-liquid separator by the operation of the diaphragm pump.

Abstract: The downhole pumping member is reciprocated upwardly by pressurizing the column of oil using an above ground pressure actuator. When this occurs, the pumping member draws a charge of oil from the well. Next the column of oil is depressurized, allowing the pumping member to fall under gravity, which in turn forces the charge of oil upwardly toward the surface. The above ground actuator is hydraulically operated using a hydraulic fluid which is maintained separated from the production oil being pumped.

Abstract: A rodless submersible down hole pumping unit for a producing oil and/or gas well and including in combination a submersible prime mover operably connected with a source of electrical power from the surface of the ground through a suitable electrical cable. A pressure fluid source, a fluid moving pump operably connected with the motor for actuation thereby, a shifting valve assembly operable between the fluid moving pump and a shift rod assembly for transmitting reciprocation to a piston rod, the piston rod cooperating with a product valve unit for drawing well fluid from the fluid reservoir of the oil and/or gas well into the interior of the apparatus and discharging the well from the interior of the apparatus into the well tubing during continued reciprocation of the piston rod whereby the well fluid may be delivered to the surface of the ground for recovery thereof.

Abstract: A spray gun includes a material inlet and an air inlet. A reciprocating hydraulic motor is connected to and drives a reciprocating hydraulic pump which pumps material from a material reservoir to the pump outlet. A first air piloted hydraulic valve is connected to the pump outlet and the first valve is connected to and is operable to transmit pumped material to either the material inlet of the gun or to the material reservoir. A second motor is connected to and drives a second hydraulic pump which is connected to and supplies hydraulic fluid from a hydraulic reservoir to the reciprocating hydraulic motor. A second air-piloted hydraulic valve is connected between the second hydraulic pump and reciprocating hydraulic motor and is operable to transmit pumped hydraulic fluid to either the reciprocating hydraulic motor or to the hydraulic fluid reservoir. An air control valve is connected to an air supply and is connected to the first and second valves.

Abstract: A method and system for pneumatically driving a pump for an artificial heart is disclosed which can pump blood as approximate as possible to the natural heart without increasing the capacity of any pressure tank. A compensation drive pressure which compensates for the drop of the drive pressure is additionally applied to the pump whenever the drive pressure is applied to the pump.

Abstract: A multicylinder, hydraulic driven, dual arranged mud pump is disclosed. The preferred embodiment consist of dual mud pumping units arranged to be selectively operated as individual pumps, as two pumps whose output flow is in parallel, or as two pumps whose output flow is in series. Each mud pumping unit is comprised of plural pumping assemblies with each assembly consisting of a pair of separate end to end cylinders, one cylinder being arranged to be driven by a second cylinder with the one cylinder further being arranged to pump mud and the second cylinder being arranged to be reciprocally driven in a sequential manner by pressurized hydraulic fluid.

Abstract: Submergible pumping apparatus for use in an oil or other well comprises, in a self-contained downhole unit, a double-acting reciprocating positive displacement pump for pumping well fluid, a reservoir containing power fluid for operating the double-acting pump, a rotary motor-driven positive displacement pump for supplying power fluid under pressure from the reservoir to operate the reciprocating pump, and a control valve for properly directing high pressure power fluid from the rotary pump to the reciprocating pump and from the reciprocating pump back to the reservoir so as to provide stroke reversal of the reciprocating pump.

Abstract: Sewerage pumping apparatus is provided for delivering sewerage collected by gravity in a wet well to a force main which supplies sewerage by force to a remotely located sewerage treatment plant. The sewerage pumping apparatus comprises a hydraulically driven submersible pump located in the wet well for supplying sewerage to the force main. Two trailer-mounted hydraulic pump units (main and standby) adjacent the wet well are alternatively operable to supply pressurized hydraulic fluid to drive the submersible pump. Check valves prevent the operative pump unit from supplying hydraulic fluid to the inoperative pump unit. The main pump unit is driven by an electric motor energized from a nearby electric utility power line. The standby pump unit is driven by an internal combustion engine. Float switches sense the sewerage level in the wet well and regulate operation of the in-service pump unit (and submersible pump) accordingly.

Abstract: A continuous and unidirectional rotation reversible pitch axial thrust heart pump having a blood handling housing with first inlet and outlet check valves connected to the housing and second inlet and outlet check valves connected to the housing. A first diaphragm is movable in the housing for alternately pumping blood into the first inlet and out of the first outlet valve. A second diaphragm is movable in the housing for alternately pumping fluid into second inlet and out of the second outlet valve. A continuous and unidirectional rotating axial thrust pump is positioned in a hydraulic fluid chamber between the diaphragms. The impeller includes a plurality of blades rotatably mounted on a circular bearing which is rotatably mounted in the housing. The pitch angle of the blades is alternately rotated and reversed which alternately directs the hydraulic fluid to each of the diaphragms that alternately pumps fluid into and out of the housing.

Abstract: A positive displacement reciprocating pump for conveying a liquid or gaseous fluid is disclosed and which comprises a fluid enclosure having a movable piston means mounted therein which sealably divides the enclosure into a pumping chamber on one side and an actuating chamber on the other side. The piston means may comprise either a slideable piston or a flexible diaphragm. An inlet valve and a separate outlet valve are each connected to the pumping chamber, and a control system is provided for intermittently supplying a pressurized working fluid to the actuating chamber so as to intermittently move the piston means in the discharge direction, with the piston means being moved in the opposite or suction direction by either the pressure of the fluid being conveyed, or a suitable spring.

Abstract: A downhole well pump powered by pressurized fluid conducted to it through a power fluid conduit connected to its upper end by a remotely releasable connector which makes it possible to run and retrieve the pump either at the time the power fluid conduit is run or retrieved, or separately, and when run or pulled separately either through use of the conduit or other means such as wireline, rods, pipe, or the like, the connector being releasable simply by dropping a ball into the conduit and then building fluid pressure against the ball. Actuation of the connector to disconnect also opens a drain or equalizing passage in the pump automatically. The power fluid conduit being inside the well tubing makes it practical to install this pump in wells having casing of sizes insufficient to accommodate power fluid conduits exterior of the tubing. Installations and methods for their preparation are also disclosed. Gas lift valves may be used in the power fluid conduit, where the power fluid is gas.

Abstract: A gas compressor has at least one closed container with gas inlet means for filling the container with a gas to be compressed and gas outlet means through which compressed gas can leave the container. When the container has been filled with gas to be compressed, a fluid is forced into the container to compress the gas therein and force it out of the container. After the container has been filled with fluid and the gas forced therefrom, the fluid is drained while gas again enters and fills the container. The output of the container is generally connected to a gas storage tank and the cycle of filling the container with gas and then expelling it is repeated until a desired pressure of gas is obtained in the storage tank.The compressor is particularly suited to filling a storage tank, such as a natural gas storage tank in a vehicle, over an extended period of time of several hours.

Abstract: A well point pumping system including a series of well points installed in an area of the ground which is to be dewatered or dried out. This system and its apparatus include an enclosed tank which can be located closely adjacent the well points which are often in a dirty, wet and/or remote area which often has difficult access. Also, the dewatering areas may be located at different levels below the ground surface. Usually the apparatus is subjected to severe abuse from handling, being moved about or from other machinery in the area. Furthermore, it may be difficult to install or remove the apparatus. The present system and apparatus include an enclosed tank which is capable of withstanding abuse and which can be located in the dirty working area and remotely from its power source. The tank encloses an impeller type water pump assembly, and also encloses a vacuum pump and its drive motor which create the required vacuum in the tank to cause water to be inducted into the tank from the well points.

Abstract: A system for pumping liquid materials with reciprocating pumps driven by hydraulically operated motors, wherein the pressurized hydraulic oil which is used to drive the hydraulic motors is supplied via reciprocating proportioners. The reciprocating proportioners are driven by a reciprocating air motor operated under predetermined air pressure. The system operation is characterized in that, under blocked output pressure conditions, the air motor will inherently stall and thereby limit the pressure of the hydraulic oil acting to drive the hydraulic motors, which therefore limits the pumping pressure applied to the reciprocating pumps, and limits the output pressure of the pumped liquid materials.

Abstract: A multicylinder, double acting improved mud pump is disclosed, the preferred embodiment incorporates a hydraulic powered piston in a cylinder which connects with a piston rod which, in turn, drives a second piston in a cylinder adopted to pump fluid mud. The first piston is driven by hydraulic oil delivered under pressure to intake manifolds through an independently driven valving apparatus which times the delivery of the hydraulic fluid for the main power stroke and further times the discharge of the hydraulic fluid for the return secondary power stroke, the system being controlled independently of piston action in timing of multiple pistons in multiple cylinders by the valve system. Additionally an intake valve delivers fluid mud at lower pressure on the intake side of the mud compression piston, and an outlet valve traverses with the piston rod to direct the outlet mud flow.

Abstract: My invention relates to pumping apparatus, particularly to a hydraulically-operated pump jack for oil, brine water and the like. The apparatus is fabricated from steel plate to make a strong, but light-weight tower which may be easily transported from one site to another by a small boom truck or gin pole truck. In contrast to pump jacks of the walking beam type which are massive in size, my improved pump jack is compact and is seated on and secured directly to the head of an oil well casing. A vertically-arranged hydraulic cylinder has its piston rod connected to a cross head on which a pair of sprockets are journalled. Chains pass around respective sprockets, one reach of each chain extending upwardly and is anchored to a stationary part of the tower. The other reach of each chain extends upwardly and over and around an upper sprocket journalled on a shaft carried by the upper end of the tower, each chain then extending downwardly to a yoke to which the polish rod is connected.

Abstract: A method, system and apparatus is disclosed for pumping liquid from a well such that vapor lock of the pump cannot occur due to gas or steam and such that the pump strokes only in response to the production rate of well liquid. The pump can be used for lifting heavy oils heated by steam floods or the like as well as for pumping liquids from conventional wells. Reduced pump wear, reduced energy requirements, reduced maintenance and the automatic adaption to changing well production rates are among the objects of this invention.

Abstract: A pumping method, principally for oil, allows the sucker rod to fall under gravity for the first part of the downward stroke, then decelerates the sucker rod to a slow rate of descent, so creating a pause in the sucker rod's motion. Shock-absorbing means are provided to eliminate the impulsive loadings imposed upon the sucker rod at either extremity of its motion in conventional pumping methods. Hydraulically and mechanically-driven apparatus is disclosed for carrying out the method.

Abstract: A hydraulic pump jack for hydraulically actuated well pumps of the general type having pistons driven in one direction to lift liquid up a delivery pipe and having the pistons returned to recharge the said pump, comprising a double-acting surface pump with one pump section arranged to communicate with a liquid delivery pipe extending up the well and the other section arranged to communicate with a pump control pipe which also extends up the well, and valve means connected to the said control pipe to open the delivery pipe to allow an outflow of liquid from the delivery pipe during the pressure stroke of the pump section connected to the said control pipe.

Abstract: A system for supplying foam liquid concentrate via a concentrate pump to one or more water pump discharge outlets. The concentrate pump is powered by a variable output hydraulic drive which in turn is automatically modulated independently of the level of operation of the water pump by a control system which is responsive both to the water pressure developed by the water pump and to the foam liquid concentrate pressure developed by the concentrate pump.

Abstract: A downhole, electro-hydraulic pump assembly, having a hydraulic power piston connected to a double-acting production piston is disclosed. Hydraulic power for operating the power piston is developed downhole by a mechanical pump which is driven by an electrical motor carried within the pump housing. The electrical motor is energized by high-cycle electrical power conducted from a surface facility for increased pumping capability in very deep wells. Long stroke capability is provided by an annular piston and a tubular connecting ram which ride on a tensioned guide tube. The effective production piston area is maximized for efficient production in both up-stroke and down-stroke by conducting the flow of formation fluid produced in the down-stroke through the bore of the tensioned guide tube.

Abstract: The preferred embodiment is directed to an oil well pumping apparatus incorporating a walking beam having a horsehead at one end which connects to the sucker rods in the oil well. The opposite end of the walking beam is supported on a fixed pivot. A hydraulic and pneumatic combination unit connects from a supporting platform to a central point on the beam to raise and lower the beam. The improved apparatus utilizes air pressure to balance the static load on the apparatus and dynamically strokes the sucker rod string by imparting a reciprocating motion through hydraulic power applied at a specified rate to raise and lower the walking beam. A pump and motor system for a closed hydraulic loop is included. Alternate preferred embodiments are disclosed. In one form, a lubricating system is incorporated. First and second alternate forms of pickoff apparatus which powers the pneumatically balanced pumping apparatus is also included.

Abstract: Apparatus for pumping a liquid from a well comprises a drive unit on the surface, a well-bottom pump unit, two supply lines interconnecting the drive unit and the pump unit and a liquid discharge line extending from the pump unit to the surface for discharge of liquid. The pump unit has a drive piston which is reciprocated within a drive cylinder by applying pressure alternately by means of a changeover valve to the two supply lines. The drive piston drives a double acting driven piston which pumps oil from a well. The changeover valve is controlled by a logic unit which receives signals from sensors measuring the pressure and/or flow rate in a return line.

Abstract: A fluid actuated pumping system for producing fluid from a subsurface reservoir through a wellbore communicating therewith. A conduit extends from the surface, downhole to the pump. The pump includes an inner piston reciprocatingly received within an inner barrel, an annular piston reciprocatingly received within an outer barrel, and energy storage means connected to the pistons by which energy is stored when one of the pistons is forced to move downhole. The inner piston divides the inner barrel into an upper and lower chamber, and check valve means associated therewith enables reciprocation of the piston to cause one way flow to occur into the lower chamber, and from the lower chamber into the upper chamber, where the liquid is lifted through the conduit and to the surface of the ground. The conduit is also flow connected to the annular piston so that when fluid pressure is applied thereto, both pistons are forced in a downhole direction to store energy.

Abstract: In a power braking system for a vehicle a supply of fluid from a power source is utilized to augment the output pressure to be supplied to a brake from a pedal-operated brake control valve assembly. The power source comprises a source of hydraulic fluid of a type different from that which is supplied to the brake from the control valve assembly, and the fluid under pressure from the pressure source is supplied to at least one pressure converter which is adapted to pressurize hydraulic fluid in a sub-system to augment the output pressure from the control valve assembly. The sub-system is provided with hydraulic fluid of a type different from that of the power source, and an hydraulic accumulator is incorporated in a line between the pressure converter and the control valve assembly.

Abstract: An automatic pump for deep wells comprises a long stroke reciprocating pump having its piston normally in its bottom position and an automatic control dependent upon the collection of a predetermined amount of liquid in the pump cylinder above the piston for actuating the piston to pump the liquid into a production line. The automatic control includes an electric motor driven hydraulic pump and a reservoir of hydraulic fluid which is actuated upon filling of the reciprocating pump chamber to supply hydraulic fluid to a closed chamber below the piston and force the piston upwardly to discharge liquid from the pump cylinder. Gas collected in the top of the pump cylinder results in low starting current and a saving of energy. The hydraulic pump is reversed automatically upon completion of the pumping stroke of the piston. The assembly may be inserted in a well casing on a wire line and positioned in the casing, a packer being provided between the assembly and the casing.

Abstract: The present hydraulic system for driving a submersible pumping unit has an above-ground pump for pumping oil through a hydraulic motor in the submersible pumping unit which has a gate valve to prevent the reverse flow of water after the submersible pumping unit is turned off. A pressure regulating valve limits the oil pressure to the hydraulic motor. The inlet flow to the above-ground pump is filtered. In the present improvement, the hydraulic surge at start-up and shut-down is cushioned by bypassing hydraulic fluid through an accumulator which causes pressure at the motor in the submersible pumping unit to build-up relatively gradually at start-up and decrease relatively gradually at shut-down.