Abstract: An apparatus for conveying thick matter has a drive cylinder for receiving hydraulic fluid, a drive piston, which is arranged in the drive cylinder, a conveying cylinder for receiving thick matter, a conveying piston, which is arranged in the conveying cylinder, and a piston rod, which is fastened to the drive piston for coupling motion together with the conveying piston. The drive cylinder has a rod-side opening for applying pressure to a rod side of the drive piston by way of hydraulic fluid and a crown-side opening for applying pressure to a crown side of the drive piston facing away from the rod side by the hydraulic fluid. A drive pump is designed to generate a drive volume flow having a drive pressure of hydraulic fluid for moving the drive piston. A pump connection is designed for variable connection of the drive pump to the rod-side opening or the crown-side opening for the flow of hydraulic fluid.

Abstract: Methods for operating a decoupled long stroke pump to pump treatment fluid to a wellbore are provided. The decoupled long stroke pump has relatively long stroke plungers that can be powered by hydraulics, linear electric motors, mechanical long stroke mechanisms, linear actuators, or any other device that can provide a linear force to the plungers. Such long stroke pumps have the suction and discharge strokes decoupled such that an absolute linear flow rate without pressure pulses on the suction or discharge can be produced. Any desired flow profile of the treatment fluid can be produced via the decoupled long stroke pump.

Abstract: The present patent of invention relates to a hydraulic unit (U) with a pneumatic cylinder (15) that works jointly with a servomotor (M), together with a ball screw (29) to together move a hydraulic piston pump (8), made up of a hydraulic plunger (7), with related sealing elements to prevent oil leaks, noise, metal-on-metal attrition and loss of efficiency, that is moved upwards and downwards using a ball screw (29) and a pneumatic cylinder (15), jointly with a servomotor (M) which, when moved, pushes the pressurized oil outwards while filling the opposite hydraulic chamber with an oil suction movement, the pumped oil entering a hydraulic pressure accumulator (25), where it remains idle to be used when required and being supplied by the up/down movement of the piston, generating continuous pumping, which is automatically stopped when the hydraulic pressure accumulator (25) is full and has reached the predetermined hydraulic pressure.

Abstract: A hydraulic drive system for a construction material pump has a hydraulic circuit for hydraulic fluid, a feed pump which is designed to feed hydraulic fluid into the hydraulic circuit, at least one controllable pressure-limiting valve unit, which is designed for variable adjustment of a limit pressure of hydraulic fluid of at least one portion of the hydraulic circuit within a pressure range, and a control unit. The control unit is designed to control the pressure-limiting valve unit according to at least one operating parameter of the hydraulic drive system and/or according to the hydraulic fluid in such a way that the pressure-limiting valve unit adjusts the limit pressure of the portion of the hydraulic circuit.

Abstract: A fluid storage and pressurizing assembly includes a storage receptacle and a pump assembly. The storage receptacle includes an inner vessel defining a cryogen space for storing a fluid at a storage pressure and a cryogenic temperature, an outer vessel surrounding the inner vessel, and an insulated space between the inner vessel and the outer vessel, and a pump assembly. The pump assembly includes a pump immersed in the cryogen space having an inlet for receiving a quantity of fluid from the cryogen space, and an outlet for delivering the fluid therefrom. The pump assembly further includes a pump drive unit for driving the immersed pump, the pump drive unit being at least partially disposed within a space defined by the storage receptacle.

Abstract: A fluid storage and pressurizing assembly includes a storage receptacle and a pump assembly. The storage receptacle includes an inner vessel defining a cryogen space for storing a fluid at a storage pressure and a cryogenic temperature, an outer vessel surrounding the inner vessel, and an insulated space between the inner vessel and the outer vessel, and a pump assembly. The pump assembly includes a pump having an inlet disposed within the cryogen space for receiving a quantity of the fluid from the cryogen space, and an outlet for delivering the fluid therefrom, and a pump drive unit for driving the pump, the pump drive unit being at least partially disposed within a space defined by the storage receptacle.

Abstract: Apparatuses, systems, and method for hydraulic pumps are disclosed. Particularly, hydraulic pumps for ophthalmic surgical procedures are disclosed. Hydraulic pumps within the scope of the disclosure may include an aspiration pump. An example aspiration pump may include first and second hydraulic cylinders and a plurality of one-way valves that are operable to permit fluid flow into a first part of a hydraulic cylinder responsive to movement of a piston within the hydraulic cylinder in a first direction and operable to permit fluid to flow out of the hydraulic cylinder responsive to movement of the piston in a second direction opposite the first direction. The aspiration pump may be attached to a housing of a hand piece, or a portion of the aspiration pump may be received into the housing of the hand piece.

Abstract: A bellows pump device includes first and second bellows mounted on a pump head so as to be expandable/contractible independently of each other and configured to suck a fluid from a suction passage thereinto by expansion thereof and discharge the fluid therefrom to a discharge passage by contraction thereof. First and second air cylinder portions are configured to respectively cause the first and second bellows to perform expansion/contraction operation. First and second detection devices are configured to detect expanded/contracted states of the first and second bellows, respectively. A control unit is configured to control drive of the first and second air cylinder portions on the basis of each of detection signals of the first and second detection devices such that, before one bellows comes into a most contracted state, the other bellows is caused to contract from a most expanded state.

Abstract: A hydraulic system, wherein an actuating cylinder and an accelerating cylinder each includes a piston, a rod, and a tube. When the rod of the actuating cylinder extends in an unloaded condition, a circuit is configured such that oil discharged from the bottom-side section of the accelerating cylinder is supplied to the bottom-side section of the actuating cylinder through a bottom line. When the rod of the actuating cylinder extends in a loaded condition, a circuit is configured such that oil supplied to the bottom line without passing through the accelerating cylinder is supplied to the bottom-side section of the actuating cylinder. The circuit for the unloaded condition and the circuit for the loaded condition is switched based on a pressure sensing in the bottom line.

Abstract: A multistage piston compressor for a gaseous or cryogenically liquefied medium with at least two compressor stages, which operatively interact with a shared drive train for purposes of joint powering, wherein each compressor stage exhibits a piston that is mechanically connected with the drive train, and arranged in a compressor cylinder so that it can longitudinally shift.

Abstract: A multi-chambered pumping system is provided comprising an input cylinder configured to pump a source substance into a vessel and an effluent cylinder configured to receive an effluent from the vessel. The cylinders regulate the pressure of the source substance input into the vessel and recover the pressure of an effluent output from the vessel to pump additional quantities of source substance into the vessel. In each cylinder, a piston creates a boundary between two sections: a fluid section configured to receive working fluid and an effluent or input process section to receive the same. The fluid sections of the cylinders are in fluid communication. A guide rod is attached to each piston and may be operably sized to compensate for a pressure difference between a pressure at which the source substance is pumped into a vessel and the pressure at which an effluent is output from the vessel.

Abstract: A device and a method for controlling a two-cylinder thick matter pump to achieve a reliable operation even of single-circuit two-cylinder thick matter pumps. To this end, the pipe switch includes a position transmitter responding to the pivoting position. At least two cylinder switching sensors are arranged on the working cylinders at a distance from each other, responding to the passing pistons of the drive cylinder, and/or a pressure sensor responding to the pressure course at the high-pressure outlet of the reversible pump is provided. A computer-assisted reversing device has a control routine responding to output signals of the position transmitter and to output signals of the cylinder switching sensors and/or the pressure sensors, enabling the programmed control of a control body for adjusting the flow quantity and direction of the reversible pump, and a reversing element arranged in the hydraulic branch of the pipe switch.

Abstract: The invention relates to a device and a method for controlling a two-cylinder thick matter pump comprising delivery pistons that are actuated in a push-pull manner by means of a hydraulic reversible pump (6) and hydraulic drive cylinders controlled by said pump. For each pressure stroke, the delivery cylinders (50, 50?) are connected to a delivery conduit (58) by means of a pipe junction (56). At the end of a pressure stroke, a reversal process of the reversible pump (6) and the pipe junction (56) is triggered. The aim of the invention is to obtain a targeted reversal of the reversal pump and the pipe junction, even when the deliverable quantity is varied, whereby the delivery cylinders are completely emptied, but also without pistons banging the ends of the cylinders.

Abstract: A pump intake apparatus for directing fluid flow to a pump. The pump intake assembly includes a pump intake column having a pump bell and a pump intake pit. The intake pit includes an upper intake pit encircling the pump intake column and has a tapered inner surface providing the upper intake pit with a decreasing cross-sectional area to accelerate the fluid flow toward the pump bell. The upper intake pit may include at least one vane extending inwardly from the inner surface of the upper intake pit to suppress rotation of a fluid flowing through the upper intake pit. The intake pit further includes a lower intake pit floor positioned substantially below the pump bell and including a projection member upwardly extending from a central region of the lower intake pit floor toward the pump bell. The lower intake pit floor has a substantially curvilinear surface interconnecting the upper intake pit to the projection member to redirect and accelerate fluid flow toward the pump bell.

Abstract: Apparatus and methods are provided for pumping concrete using a pumping apparatus including first and second drive cylinders, a valve, and a pump. Fluid is delivered into the cylinders from the pump to reciprocate pistons within the cylinders. Pressure within the cylinders is monitored, and a direction of flow of the fluid is switched based upon the pressure within the cylinders. For example, during rod-side operation, the valve is set to deliver fluid into a head side of the cylinders. When the pressure exceeds a predetermined threshold, the valve switches to head-side operation, and fluid is delivered into a rod side of the cylinders. If the pressure falls below the threshold, the valve switches the cylinders back to rod-side operation.

Abstract: In a thick matter pump, especially for delivering concrete, comprising two delivery cylinders, it is known to provide two position sensors in one of the two cylinders for control of the pistons. However, leakage of hydraulic fluid can lead to an imbalance of the two cylinders. In the invention two position sensors (52?, 52?) are provided, which are arranged at a defined distance from one of the ends of the drive cylinders and which respond to a drive piston (30?, 30?) that is passing by. To prevent the formation of concrete clots inside the delivery cylinders (10) and to prevent the occurrence of a slamming when the drive pistons (30?, 30?) reach their end of travel, the invention provides that both position sensors (52?, 52?) are arranged at a distance from the piston rod-side ends of both drive cylinders (24?, 24?) and, in addition, a correcting sensor (54) is arranged at a defined distance from the piston head-side end of one of the drive cylinders (24?).

Abstract: The invention relates to a thick matter pump, especially for delivering concrete. The thick matter pump comprises two delivery cylinders (10), which open into a material feed basin (14) via openings (12) situated on the face. The thick matter pump also comprises two hydraulic drive cylinders (24′, 24″) whose pistons (26, 30′, 30″) are rigidly interconnected in pairs via a shared piston rod (28). The drive cylinders (24′, 24″) are connected to a hydraulic reversing pump (42) via piston rod-side and piston head-side pump connections (34′, 34″; 36′, 36″). In addition, they communicate with one another on their ends opposite the pump connections via a swing oil line (44). The drive cylinders and, with them, the delivery cylinders are driven in a push-pull manner via the reversing pump (42).

Abstract: A hydraulic system for a reciprocating piston pump that includes an accumulator for producing a steady-pressure supply of compressible material to a distribution nozzle. The hydraulic system includes an adjustable means for constricting the flow of hydraulic fluid from the accumulator to the hydraulic system. The means for constricting the flow of hydraulic fluid allows the operator to compensate for the type of material being pumped, the vertical distance the material is being pumped, as well as the overall distance the material is being pumped in order to reduce or eliminate line surge. The means for restricting the flow from the accumulator preferably includes a needle valve that allows the operator to select the flow characteristic from the accumulator.

Abstract: A mud pump is provided with two cylinders for pumping mud in connection with water well drilling, and two sets of hydraulic oil cylinders with pistons connected to and driving the pistons of the mud pump by piston rod connecting plates. A flow divider located downstream from a hydraulic oil power supply pump applies hydraulic power evenly to two sets of mud pump driving cylinders, but the flow divider accommodates re-routing of hydraulic oil to one driving cylinder during a directional valve shift for the other driving cylinder. Rod position sensing switches coupled to an electro-hydraulic control system coordinates the action of the sets of pump driving cylinders and thereby of the mud pumping cylinders, to control and phase the mud driving pistons produce a steady mud pump output simulating the effect of constant velocity pistons.

Abstract: A bulk material pump device includes first and second hydraulic drive cylinders capable of causing alternate reciprocating movement of the corresponding pumping pistons to pump concrete contained in a hopper through a transportation conduit. The first drive cylinder has a cylinder housing whose bore is divided into a base chamber and a head chamber by a drive piston slidably received in the cylinder housing. The base chamber is in fluid communication with an oil pump while the head chamber is connected to the second drive cylinder. Under a loaded operation condition, a part of the pressurized oil in the base chamber is admitted into the head chamber via a head bypass line at the end of retracting movement of the drive piston and almost the same amount of the oil is returned back from the head chamber to the base chamber via a base bypass line at the end of extending movement thereof.

Abstract: A fluid driven reciprocating apparatus having a double acting power chamber with signal rods serving as high pressure pistons, or to transmit mechanical power. The signal rods are connected to a double acting piston in the power chamber thereby eliminating the need for pilot valves, with the piston being controlled by a pair of intake-exhaust valves. The signal rod includes two spaced seals along its length with a vented space therebetween so that the driving fluid and driven fluid can't mix, and performs a switching function to eliminate separate pilot valves. The intake-exhaust valves can be integrated into a single housing with the power chamber, or these valves can be built into the cylinder head only of the power chamber, or they can be separate from the power chamber.

Abstract: The invention relates to a sequential control system for two-cylinder thick medium pumps whose delivery cylinders (1, 1′) are actuated hydraulically by two drive cylinders (5, 5′) in opposing cycles. A pipe shunt (3) is provided inside a material feed container and is connected at the inlet side alternatively to the apertures (2, 2′) of the delivery cylinders (1, 1′) and at the outlet side to a pump line (4). The drive cylinders (5, 5′) are each connected at one end to a different connection pint of a reversing pump (6) to form a closed hydraulic circuit (11, 11′) and at their outer ends via an oscillating oil line (12) hydraulically to one another. To effect switching of the pipe shunt (3), pressure oil is taken off directly from the hydraulic lines (11, 11′) leading from the reversing pump (6) to the drive cylinders (5, 5′).

Abstract: The invention relates to an apparatus for use in a liquid circulation system of the kind comprising a primary circulatory circuit provided with a circulation pump and having a primary forward flow and a primary return flow, as well as a secondary circulatory circuit with a secondary forward flow and a secondary return flow, said primary and secondary forward and return flow being connected to the apparatus, and the liquid circulating in the primary and secondary circulatory circuits being of substantially the same composition. The apparatus comprises two positively interconnected displacement machines (A, B), of which one (A) receives the primary forward flow (P.F.) and delivers the secondary forward flow (S.F.), whilst the other (B) receives the secondary return flow (S.R.) and delivers the primary return flow (P.R.

Abstract: A multiphase piston-type pumping system including a feed line (13) for the fluid to be pumped and a discharge line (19) for the pumped fluid, with at least one first variable-volume chamber (2) designed for pumping, the fluid, and with chamber being defined by a first cylinder head (3), a first cylinder (4), and a first piston (5), whereby piston (5) moves along the longitudinal axis of cylinder (4) in the cylinder (4). A first drive element (6) moves the piston (5) in the cylinder (4). The system also has a casing (23) surrounding at least the space swept by piston (5), with the space being opposite the first chamber (2) with respect to and with the piston (5), said easing (23) containing a gaseous fluid. The piston (5) has a recess (20) designed to receive a projection (10) integral with cylinder head (3), whereby these two elements produce a jet of fluid directed at a discharge port (15).

Abstract: A hydraulic fluid-driven, multicylinder, modular, reciprocating piston pumping machine of non pulsating flow and independently variable forward and return stroke speeds comprises several pumping modules (A, B . . . E) each having one primary cylinder (A1, B1 . . . E1) and one secondary cylinder (A2, B2 . . . E2) coaxially joined by an angularly and radially oscillating bushing (100) through which slides a piston rod (A3, B3 . . . E3) with an angularly oscillating piston (A4, B4 . . . E4; A5, B5 . . . E5) at each of its ends. Each primary cylinder (A1, B1 . . . E1) has the end opposed to the bushing closed by valve monifolds (A11, B11 . . . E11) interconnected through a pressurized hydraulic fluid distritubor conduit (5) through which pressurized hydraulic fluid is supplied to the primary cylinder of each module by at least one hydraulic pump (1, 2). A hydraulic fluid chamber (A18, B18 . . .

Abstract: 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 divides a chamber therein to define a power section and a pumping section. An intake-exhaust valve is connected to each of the power sections of the pump chambers, and function to direct fluid, such as compressed air, into the power section and exhaust fluid therefrom. At least one of the pistons or diaphragms is connected by a rod assembly which is constructed to define a signal valve, whereby the intake-exhaust valve of one pump assembly is controlled by the position or location of the piston or diaphragm in the other pump assembly through the operation of the rod assembly signal valve. Each of the pumping sections of the pump assemblies are provided with intake and exhaust valves to enable filling of the pumping section with fluid and discharging fluid therefrom when a desired pressure has been reached.

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 adapted 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 transverses with the piston rod to direct the outlet mud flow.

Abstract: A method and device for controlling a thick matter pump having two feed cylinders, each coupled to a material feed tank and including a drive piston for pumping thick matter through the respective feed cylinder. Each drive piston is driven within a respective drive cylinder coupled to a hydraulic reversing pump, which drives each drive piston through a compression stroke by pumping pressurized fluid to the respective drive cylinder. A hydraulically operable tube switch is alternately coupled to the feed cylinders to receive the thick matter being pumped, and is coupled to a delivery pipe to direct the flow of thick matter from each feed cylinder into the delivery pipe. Hydraulic tube-switch cylinders actuate the tube switch and are coupled between the reversing pump and the feed cylinders for receiving pressurized fluid flowing between the reversing pump and the drive cylinders to decouple the tube switch from one feed cylinder and couple the tube switch to the other.

Abstract: A slurry pumping method and an apparatus to deliver slurry waste from factories to a filter press for solid-liquid separation. In this apparatus, a pair of laterally or vertically arranged diaphragm type pumping devices are activated by hydraulic cylinders, each consisting of a main cylinder and a subcylinder directly connected to the main cylinder, to introduce slurry from the slurry tank and deliver it under pressure by a resilient diaphragm of each pumping device to the filter press where it is processed for solid-liquid separation. One of the diaphragm type pumping devices is first started, followed by the other, thus alternately and repetitively activating the two pumping devices to achieve continuous operation of the slurry pumping process. When the processing is completed, the two hydraulic cylinders of both diaphragm type pumping devices are stopped by controlling the sleeve valves. In this way, an effective slurry pumping can be achieved.

Abstract: A two cylinder thick matter pump has two hydraulic drive cylinders, two pistons supported and driven within each respective drive cylinder, and two feed cylinders. Each feed cylinder is adapted to receive a respective piston therein to pump the matter therethrough. A hydro-pump is coupled to the drive cylinders to supply hydraulic fluid thereto. A reversing valve is coupled to the hydro-pump to reverse the direction thereof. Two pressure switching valves are coupled to one of the drive cylinders and to the reversing valve to actuate the reversing valve upon a change in cylinder pressure. Two electronic proximity switches are supported adjacent to the pistons and coupled to the reversing valve. The proximity switches actuate the reversing valve in parallel with the switching valves.

Abstract: Concrete-pumping device comprising a frame, a number of pump cylinders mounted on the frame which comprise a pump opening close to one end, sealed pump pistons which are guided slidably in the pump cylinders toward and away from the pumping device and which are each coupled to reciprocal driving to the plunger of a coaxially arranged hydraulic jack, hydraulic switching means for cyclically feeding to and discharging from the jack hydraulic oil under pressure such that the plunger causes the reciprocating movement of the pump piston and concrete switching means for alternately placing the pump opening in communication with a feed funnel and a pressure conduit for concrete synchronously with the movement of the pump piston in order to pump concrete out of the feed funnel into the pressure conduit.

Abstract: Processes and apparatus for the construction of improved tank structures employing a pump metering and delivery system which accurately meters, mixes and evenly applies composite materials to form the walls of tanks or containment vessels. Such systems have specific application to the construction of walls of prestressed tanks formed by inflating a membrane and applying rigidifying material outwardly of said membrane and then prestressing the walls by circumferentially wrapping prestressing material around the same. Promoters, catalyst, and other chemicals are used to create composite walls, each feeding into individual pump systems comprised of at least two hydraulic cylinders connected to supply cylinders which are coordinated so that their strokes are controlled to arrive at a desired flow. The flow is then channeled through a mixer which mixes the material for spraying through a nozzle. The flow from the nozzle can also be intermixed with chopped glass from a chopper system or with granular materials.

Abstract: In an apparatus for pneumatically discharging concrete fed hydromechanically in a dense stream, using for the hydromechanical feed a concrete pump having a hydraulic drive comprising at least two cylinders with opposed pistons, said pump having synchronization control by a displacer circuit conducting the working medium displaced by a piston, and having a dosing means for an additive serving as an accelerating agent, whose drive is connected to the hydraulic circuit of the concrete pump drive, the inventive proposal is that the drive of the dosing means is connected to the displacer circuit and designed as a reciprocating piston drive whose absorption amount corresponds to the displacement amount of the working pistons and is added in both directions to the displacement amount of each working piston.

Abstract: A pump unit comprising co-operating, push-pull connected reciprocating pumps for the pumping in portions of contents to packing containers on a packing machine. The reciprocating pumps (1) each comprise a control piston (4) connected to the pump piston (6) in control cylinders (18), which are joined together in pairs by means of a connecting pipe (20). The pipe is provided with a flow regulating valve (21) for regulating the flow rate of the hydraulic oil and hence the piston speed. The quantity of hydraulic oil in the connecting pipe can be regulated with the help of a supply tank (23) so that the length of stroke of the pistons can be adjusted.

Abstract: An apparatus for the construction of improved tank structures employing a pump metering and delivery system which accurately meters, mixes and evenly sprays composite materials to form the walls of tanks or containment vessels. Such systems have specific application to the construction of walls of prestressed tanks formed by inflating a membrane and applying rigidifying material outwardly of the membrane and then prestressing the walls by circumferentially wrapping prestressing material around the same. Promoters, catalyst, and other chemicals are used to create composite walls, each feeding into individual pump systems comprised of at least two hydraulic cylinders connected to supply cylinders which are coordinated so that their strokes are controlled to arrive at a desired flow. The flow is then channeled through a mixer which mixes the material for spraying through a nozzle. The flow from the nozzle can also be intermixed with chopped glass from a chopper system or with granular materials.

Abstract: A fluid pump for delivering accurate volumes of high-pressure fluids is obtained using an intensifier to supply the majority of the motive power required to displace the fluids. The intensifier balances the forces between the output pressure of the displaced fluid (above a convention drive piston) with a large diameter booster piston that is driven pneumatically by low-pressure gas. A small horsepower motor provides needed power to overcome the friction of the high pressure gas pump, the differential pressure needed for the use of the pump, and to accurately control or trim the high-pressure output or rate to a precise value. A ball screw and spur gears are used to transmit the power. The pump is uniquely designed to reduce the stress from the motor to the components.

Abstract: A slurry pump has slurry hopper and dual pumping cylinders. The slurry pumping members are driven by opposite-phase actuators. Each actuator has a rigid-hollow-stem partition dividing the space between the actuator plunger and the cylinder into two drive chambers of different areas selectively supplied with pressurized fluid to drive the plunger with a selected force and speed. An associated valve shuts off flow to one of the drive chambers and is controlled at any given time to occupy the same position as a corresponding valve of the other actuator. The valves coordinate supply of fluid to corresponding drive chambers on alternate strokes of two actuators.

Abstract: A rotating drum pump having a plurality of fluid driven pistons includes a pump housing with an enclosed rotating drum, and connection openings for a supplied and discharged driving fluid and for a supplied and discharged pump flow located in end walls of the housing. The drum comprises several cylinder spaces arranged axially in pairs and concentrically arranged inside the envelope surface thereof. In the cylinder spaces, which are arranged axially in pairs and are separated by a partition, there are arranged a drive piston and a pump piston interconnected by a piston rod passing in a sealed manner through the partition.

Abstract: Method and apparatus for transferring and boosting the pressure of gas from a source to a receptacle by sequentially filling and compressing volumes of gas by displacing same with a fluid available at a higher pressure and utilizing pressure differential between the gas and fluid to signal the filling and compressing cycles.

Abstract: Apparatus for providing a variable supply of water under pressure to an hydraulic ring main pressure fluid circuit in, for example, a coal mine, comprises a reciprocating pump in said ring main and an hydraulic reciprocating motor for driving said pump mechanically coupled to said pump, the motor being operated by a variable displacement pump connected in a closed circuit with said motor.

Abstract: The unit comprises three liquid intensifiers, coupled together in juxtaposition, and fixed between a pair of plates. A support plate at the one end of the intensifiers mounts a rotary valve which, sequentially, supplies operative, low-pressure fluid to the intensifiers. A base plate at the other end of the intensifiers admits liquid into each thereof, for pressure intensification of the liquid by the intensifiers, and provides a common outlet aperture for the pressurized liquid.

Abstract: A multicylinder, improved mud pump is disclosed, the preferred embodiment incorporating a hydraulically powered piston in a cylinder which connects with a piston rod which, in turn, drives a second piston in a cylinder adapted to pump mud. The first piston is driven by fluid from a rotary distribution valve, with the distribution valve being driven independently from the movement of the piston; also, the piston can be driven on its return stroke by entrapped fluid routed from a second cylinder, or the piston can be driven on its return stroke by fluid routed from the valve. Additinally novel valving means is disclosed for the rotary distribution valve and novel hydraulic drive circuitry is disclosed, also novel mud pumping valve and piston arrangements are disclosed.

Abstract: The unit comprises three liquid intensifiers, coupled together in juxtaposition, and fixed between a pair of plates. A support plate at the one end of the intensifiers mounts a rotary valve which, sequentially, supplies operative, low-pressure fluid to the intensifiers. A base plate at the other end of the intensifiers admits liquid into each thereof, for pressure intensification of the liquid by the intensifiers, and provides a common outlet port for the pressurized liquid.

Abstract: Improved mud pump comprised of plural cylinder pumping units, each cylinder unit consisting of a pumping compression chamber and two or more hydraulic driven expansion chambers, with one or more expansion chambers being employed to drive a pumping plunger to cause fluid to be pumped through the compression chamber, also one or more of said expansion chambers being employed to return the plunger; the plunger further being employed as the housing for one or more of the said expansion chambers. The invention includes novel hydraulic drive circuitry and novel hydraulic distribution valving means for control of the hydraulic drive fluid that is utilized to drive the expansion chamber of each cylinder pumping unit. The invention also includes novel positioning means for the unidirectional inlet and outlet mud pumping valves.

Abstract: A hydraulic intensifier for oil well fracturing and/or erosion drilling, having a pair of intensifier units including a pair of sequentially operated reciprocating ram assemblies powered by hydraulic cylinder motors which are operated to maintain a substantially uniform output fluid pressure from the intensifier unit. Each cylinder motor is supplied from a main source of hydraulic fluid under high pressure which operates on the working faces of the pistons of the cylinder motors. Hydraulic fluid is also supplied to the return face side of each piston in the hydraulic cylinder motor.

Abstract: A dual-unit pump, e.g., a rolling diaphragm piston pump, suitable for pumping an abrasive high-viscosity slurry, is adapted to operate at a constant flow rate by means for detecting and correcting a pressure differential in the two units before the units switch from the pumping cycle to the filling cycle and vice versa. The flow of liquids is controlled by valves of the type which switch the flow to and from the units with essentially no volume change in the liquid inlet and outlet lines.

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: A pump is provided for circulating drilling fluid and the like into a well during a well drilling process. The pump comprises a pair of double-ended piston assemblies hydraulically reciprocated in opposite directions by a common hydraulic drive arrangement, wherein each piston assembly has a relatively large piston at one end and a relatively small piston at an opposite end. The various pistons reciprocate within appropriately sized cylinders each having a working end with a one-way intake valve through which drilling fluid is drawn from a supply tank and a one-way discharge valve through which drilling fluid is discharged to the well.

Abstract: A multiple-mode, multiplex pumping apparatus includes circuit control elements for initializing the apparatus by placing each of the pistons and plungers in each pumping section of the multiplex pumping apparatus at a respective initial starting point. The pumping apparatus also includes electronic circuit elements for controlling the inlet valves, exhaust valves and precompression valves of the hydraulic circuit of the pumping apparatus. The apparatus includes phase control circuit elements for controlling the separation of the leading edges of the plungers of two of the pumping sections of the apparatus when the apparatus is operating as a quadruplex pump. The pumping apparatus also includes elecrtronic circuit elements for insuring that each plunger of each pumping section stops at a fixed stopping point. The apparatus also includes electronic circuit elements for controlling the volume of fluid in the rod end portions of each of the pumping sections.

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.