Abstract: In a control system for operating a pump, the pump is pneumatically driven to pump hydraulic fluid to pressurize a closed vessel. The control system includes inlet and outlet ports, a pneumatic regulator, a pressure transducer, and control circuitry. The inlet and outlet ports are configured to receive inlet and output outlet pressurized air, respectively. The outlet pressurized air powers the pump. The pneumatic regulator is disposed between the ports, and configured to receive the inlet air and output the outlet air. The pneumatic regulator includes a valve that modulates pneumatic pressure based on a control signal. The pressure transducer provides a hydraulic pressure signal indicative of pressure at the output of the pump. The control circuitry is configured to adjust a parameter of the control signal based on this hydraulic pressure signal, and output the control signal to the pneumatic regulator to indirectly control operation of the pump.

Abstract: A gas booster for increasing a pressure of a gas includes a gas cylinder and a drive. The gas cylinder defines a chamber having an inlet and an outlet. A piston is actuatable within the gas cylinder to draw gas into the chamber through the inlet at a first pressure and to push the gas out of the chamber through the outlet at a second pressure that is higher than the first pressure. The drive includes an electric motor coupled to the piston of the gas cylinder by a mechanical connection to actuate the piston.

Abstract: A compressor and a method for conveying and compressing a fluid into a target system. The compressor has a first drive part having a first drive piston, a second drive part having a second drive piston and at least a first high-pressure part having a high-pressure piston. The first drive piston and the second drive piston are each able to be subjected to a drive fluid piston on alternate sides controlled via a first control unit. The first drive, the second drive piston and the high-pressure piston are jointly movable axially coupled via a piston rod arrangement. The second drive part is assigned a second control unit, which is arranged after the first control unit and via which the subjecting of the second drive piston to drive fluid is able to be activated.

Abstract: The oscillation cylinder arrangement (100) comprises a working cylinder (10A) and a piston with a rod (27A), arranged to move therein, and a control valve structure (20) for the working cylinder (10A). The control valve structure (20) incorporates a main valve (24) for transmitting a pressure medium to a first sub-chamber or a second sub-chamber of the working cylinder (10A) for a linear movement (A, B) of the piston, as well as impulse valves (22, 23), and lever arms (25, 26) for controlling them, in order to set the operational state of the main valve (24). Control members (27B) fixed to the piston rod (27A) moving in the working cylinder (10A), the control members (27B) being arranged to contact the lever arms (25, 26) of the impulse valves in order to define the extreme positions of the movement of the piston rod (27A).

Abstract: A gas transfer and depressurization system that is configured to transfer gas from a first location to a second location wherein during the transfer of gas the pressure of the first location is reduced. The gas transfer and depressurization system includes a drive chamber having an interior volume with a drive assembly movably disposed therein. A first cylinder and a second cylinder are operably coupled to the drive chamber on opposing sides thereof. The drive assembly includes a drive rod having portions extending into the first cylinder and second cylinder wherein the drive rod has pistons formed on opposing ends thereof. A controller is operably coupled to a compressed air source and is configured to provide compressed air into said drive chamber so as to reciprocally move the drive assembly. Gas blocks and coupling block are additionally present and facilitate flow of gas intermediate the first and second cylinders.

Abstract: An exhaust air conduit for a pneumatically powered pump, in particular, from a coating agent pump in a painting plant, is provided. The conduit includes an inlet for receiving the exhaust air from the pump, an outlet for discharging the exhaust air, and an exhaust air channel in which the exhaust air flows from the inlet to the outlet of the exhaust air conduit, and a housing member in which the exhaust air channel extends. A first thermal insulation element is provided in the region of a direction change of the exhaust air channel, in order to prevent an accumulation of the exhaust air directly at the inner wall of the exhaust air channel and thereby to lessen the cooling of the housing member.

Abstract: The invention relates to a metering pump having a hydraulic drive (12) for supplying a hydraulic fluid under pressure.

Abstract: The invention relates to a metering pump having a hydraulic drive (12) for supplying a hydraulic fluid under pressure.

Abstract: An air-to-hydraulic fluid pressure amplifier comprising an air cylinder having an internal reciprocating air piston; a first hydraulic cylinder having a first valve fitting and a first internal hydraulic ram that is slidably positioned within the first hydraulic cylinder; a second hydraulic cylinder having a second valve fitting and a second internal hydraulic ram that is slidably positioned within the second hydraulic cylinder; a first flow control valve and a second flow control valve; a first plunger-operated pilot valve and a second plunger-operated pilot valve. Each of the first and second plunger-operated pilot valves comprises an inlet port, an outlet port, a plunger, a barrel, and a compression spring.

Abstract: Thermal energy recovery systems include a piston assembly including a primary cylinder adapted to receive vapor; first and second secondary cylinders extending from opposite ends of the primary cylinder; a primary piston disposed for displacement in the primary cylinder; first and second secondary pistons disposed for displacement in the first and second secondary cylinders, respectively; and a piston connecting member connecting the first and second secondary pistons to the primary piston.

Abstract: An end cap assembly for a reciprocating air motor comprises a pilot valve and an end cap body. The pilot has a valve stem. The end cap body comprises a central bore for receiving an air motor rod, a valve bore in which the pilot valve is disposed such that the valve stem extends through the end cap body, and an air port extending through the end cap body. The air port has a contour to direct air toward the valve stem.

Abstract: A power machine and a power conversion system for a power machine are disclosed. In an exemplary embodiment, the power conversion system includes a pump configured to provide a source of pressurized hydraulic fluid and a control valve assembly to receive the hydraulic fluid. The control valve assembly includes a first valve element configured to direct hydraulic fluid to an actuator when the first valve element is in first and second actuated positions. The control valve assembly also includes a second valve element downstream of the first spool. The first valve element is moveable between an unactuated position and the first and second actuated positions and is configured to direct hydraulic fluid received from the actuator through the second actuated position to the second valve element and to direct hydraulic fluid received from the actuator through the first actuated position to bypass the second valve element.

Abstract: A power machine and a power conversion system for a power machine are disclosed. In an exemplary embodiment, the power conversion system includes a pump configured to provide a source of pressurized hydraulic fluid and a control valve assembly to receive the hydraulic fluid. The control valve assembly includes a first valve element configured to direct hydraulic fluid to an actuator when the first valve element is in first and second actuated positions. The control valve assembly also includes a second valve element downstream of the first spool. The first valve element is moveable between an unactuated position and the first and second actuated positions and is configured to direct hydraulic fluid received from the actuator through the second actuated position to the second valve element and to direct hydraulic fluid received from the actuator through the first actuated position to bypass the second valve element.

Abstract: A high-durability cam wheel assembly mounted in a shell of a refrigerant recovery machine is disclosed to include an open frame member, rigid wear strips mounted in the open frame member at two sides, a sliding block having friction cylinders arranged in parallel at two opposite sides and respectively disposed in contact with the rigid wear strips and a cam wheel set formed of a first cam wheel and a second cam wheel and inserted through an axle bearing in sliding block for causing the sliding block to move back and forth in the open frame member.

Abstract: A novel changeover mechanism for a compressed air driven double diaphragm pump comprises a shaft slidably mounted through aligned apertures in opposing surfaces of the twin diaphragm chambers. At the centre of the shaft between the two diaphragm chambers is provided an annular notch in to which is located an arm extending from a U shaped frame. The U shaped frame is pivotally mounted atop a valve plate which includes multiple ports. Positioned against a surface of the valve plate is a valve closure component which is configured to slide across the surface selectively obstructing the multiple ports. The valve closure component is held in place by a metal peg hingedly mounted in slots provided in parallel extension of the U shaped frame. Linear tension springs connect the hinged wire pusher with U shaped frame adjacent the pivot point. The springs bias the position of the valve closure component against the valve plate in an off centre position.

Abstract: Piston systems comprise a housing including a first piston chamber and a second piston chamber therein. A first piston is movably disposed within the first piston chamber and a second piston is movably disposed within the second piston chamber. A flow path extends between and couples the first piston chamber and the second piston chamber. Reciprocating pumps comprising a flow path between a plurality of piston chambers and methods of driving reciprocating pumps are also disclosed.

Abstract: Motorized single-machine multi-pump apparatus and closed-loop methodology interconnected with a gas pipeline at a natural gas production well, using pressurized gas flow and differential pressure to drive a pumping system regulated by pneumatic controls using self-generated clean, low-pressure instrument air. The apparatus is connected to the gas flow line and the outlet is connected back into the gas flow line at lower pressure, creating a differential pressure corresponding to the source of motive power for actuating a piston which is directly connected to a plurality of plungers. This plurality of plungers is alternately pushed into and pulled out of corresponding plunger-cylinders for creating an integral drive and pump system prerequisite for gas well site pumping operations. Instead of venting to the atmosphere, well gas is returned to the flow line whereupon only clean air from the self-generated instrument air circuit is vented into the atmosphere.

Abstract: In a diaphragm pump with two diaphragms disposed in a pump housing and actuated by an adjusting piston which can be acted on alternately and which is arranged in between the diaphragms, the diaphragms are fixed with curvatures facing one another, or a curvature facing away from one another, and two reaction spaces are formed between the diaphragms and a cylinder, the reaction spaces accommodating the adjusting piston and being filled with a hydraulic medium and connected together in a constrained arrangement by means of hydraulic linkage lines. Both diaphragms remain in position and do not fold over during a transition from a suction stroke to a pressure stroke, because the diaphragms are continuously in contact with the hydraulic lines and are thereby fixed in place, so that the diaphragms are not subjected to alternating loadings.

Abstract: A reciprocating device which may be operated either as a compressor or an engine. Each cylinder has a reciprocating piston connected to a piston rod. Dual cylinder chambers are located in each cylinder on opposite sides of the piston. The pistons are connected to a scotch yoke which translates the reciprocating motion of the pistons to rotary motion at a shaft in the engine mode. In the compressor mode, the shaft is connected to a power source. The engine components such as the pistons, rods, bushings and cylinder lines may be high quality steel or a ceramic.

Abstract: This invention is a reciprocating piston to piston device that can function 1) to increase or decrease pressure in a hydraulic or pneumatic system with minimal energy loss or 2) as a hydraulic or pneumatic pump or motor. The input and output fluids may be the same or different. The energy transferred or pumped depends on the size of the input piston, the pressure of the input fluid, and rate of reciprocation.

Abstract: A pump assembly (10) including two diesel engines (11) that are intended to operate at a relatively constant speed. The engines (11) each drive a variable displacement pump (12) that is preferably a swashplate pump. Fluid under pressure from each pump (12) drives an assembly (13) to pump a fluid such as a 95/5 emulsion, water and/or mud.

Abstract: A portable, refrigerant recovery unit for transferring refrigerant from a refrigeration system to a storage tank. The recovery unit includes two, opposed piston heads rigidly attached to respective piston rods that extend along a common fixed axis. The piston rods are rigidly attached to the yoke member of a scotch yoke arrangement. In operation, incoming refrigerant from the system is simultaneously and continuously directed to the opposing piston heads wherein the forces of the pressurized refrigerant on them counterbalance or neutralize one another. The scotch yoke arrangement includes a two-piece slide mechanism mounted about a cylindrical crank pin and a single piston embodiment is additionally disclosed.

Abstract: A system for pumping liquid having a first reservoir at a first elevation, which stores a first liquid, a second reservoir at a second elevation, where the second elevation is substantially lower than the first elevation, the second reservoir stores a second liquid, a third reservoir at a third elevation, where the third elevation is substantially lower than the first elevation, the second elevation is higher than the third elevation, the third reservoir arranged to store the second liquid, and, at least one hydraulic pump connected to the first reservoir via a first conduit, connected to the second reservoir via a second conduit, connected to the third reservoir via a third conduit, the pump arranged to be powered by the first liquid when the first liquid is permitted to fall due to gravity, the pump arranged to pump the second liquid from the third reservoir to the second reservoir.

Abstract: A system for generating electricity includes a buoyancy pump operable to convert wave motion from a body of water into mechanical energy. The buoyancy pump includes a buoyancy block that reciprocally moves in response to wave motion to pump an operating fluid that is delivered to a turbine to produce electricity. The buoyancy block is preferably sized such that a diameter of the buoyancy block is no less than about one-sixth a wavelength and no greater than about one wavelength of an average wave for a region in which the buoyancy pump is operated.

Abstract: The present invention provides a fluid control system and associated methods. The fluid control system includes a source of a pressurized fluid and a first spool valve having at least two positions, wherein the first spool valve is connected in fluid communication with the source of the pressurized fluid. The fluid control system further includes a second spool valve having at least two positions, wherein the second spool valve is connected in fluid communication with the first spool valve and the source of the pressurized fluid. When the first spool valve is in a first position and the second spool valve is in a second position, a first portion of the pressurized fluid is directed from the source of the pressurized fluid to the second spool valve via the first spool valve.

Abstract: A reciprocating fluid transfer pump in which a pilot valve assembly block can be mounted to a main body block in a simple, easy and reliable manner. In the reciprocating fluid transfer pump, a fluid, which has been suctioned into a fluid delivering chamber (19), is discharged therefrom by causing an expanding and contracting action of a barrier membrane (6) which is attached to either end of a center rod (5). The center rod is capable of reciprocating with respect to the main body block (2). A peripheral portion of the barrier membrane (6) is clamped fixedly to the main body block (2) via a main ring (30), and a pilot valve assembly block (17) having an integrated pilot valve (16) for detecting the reciprocating motion of the center rod (5) is pressed against and thus fixedly secured to the main ring (30) via a sub ring (34).

Abstract: A pump for pressurizing a fluid includes an engine portion including a first pressure vessel, a first piston movable inside the first pressure vessel, at least two pressurant entrance valves connected to the first pressure vessel, and at least two pressurant exit valves connected to the first pressure vessel. The valves are configured to be opened and closed automatically and directly as a function of a position of the first piston inside the first pressure vessel. The valves are also configured to be automatically opened and closed out of phase with each other. The pump also includes a pump portion including a second pressure vessel, a second piston connected to the first piston and movable inside the second pressure vessel, at least two fluid entrance valves connected to the second pressure vessel, and at least two fluid exit valves connected to the second pressure vessel.

Abstract: A compressor system that is configured to compress the fluid from low pressure source to a higher pressure magnitude is powered from the same low pressure fluid source. The compressor system includes two piston assemblies that are coaxially coupled to one another, and that are of differing cross sectional areas. The low pressure fluid is used to move the larger piston assembly, which is in turn used to move the smaller piston assembly. Low pressure fluid is selectively admitted to the smaller piston assembly, and movement thereof is used to compress the low pressure fluid to a higher pressure magnitude. The compressor system uses a fluidic bistable amplifier, which also coupled to the low pressure fluid source, to control low pressure fluid flow to the larger piston assembly, to thereby control its movement.

Abstract: This invention relates generally to a pneumatic and hydraulic rotating, reciprocating cylinder apparatus to be mounted on the proximal end of CNC lathe spindles, vertical or inverted machining centers, hydraulic machining work cells or rotary transfer machines to actuate work holding chucks, work holding fixtures, clamping apparatus or work supports on the distal end of said spindles. More specifically, this invention relates to an actuating system with the capability of boosting the input hydraulic pressure to the holding device by a pre-set multiple up to 5000 psi.

Abstract: A mixing pump includes a power cylinder and a second cylinder wherein one of the power cylinder and the second cylinder is interchangeable between single and double acting and wherein a working fluid is supplied to the power cylinder under pressure.

Abstract: In a pump system for supplying powder, in particular coating powder, to a powder coating apparatus, time controller is used to introduce compressed gas into a metering chamber as a function of the predetermined delay time elapsed since a predetermined operational point for the purpose of expelling a quantity of powder that was introduced into the metering chamber until the end of the time delay.

Abstract: A fuel injection system includes (i) an injector for injecting gaseous fuel and liquid fuel into a cylinder of an internal combustion engine, (ii) a gaseous fuel supplying unit having a gaseous feel tank as a first high-pressure accumulating source for pressurizing gaseous fuel, (iii) a liquid fuel supplying unit having a common rail as a second high-pressure accumulating source for pressurizing liquid fuel; (iv) a fuel pump as a pressure feeding unit that pressure feeds liquid fuel to the common rail; and (v) a compressor as a pressure increasing unit, which is operated under pressure of the pressurized gaseous fuel to increase pressure of liquid fuel pressure fed from the fuel pump.

Abstract: A fluid power unit has a cylinder in a housing, a piston slidable in the cylinder and dividing the cylinder into a retract side and an extend side, and a two-position control valve. The control valve has a spool and first and second pilots. The position of the spool is responsive to the first and second pilots. There is a retract poppet valve in the retract side of the cylinder, and an extend poppet valve in the extend side. The retract and extend poppet valves are biased to a closed position. The retract poppet valve is in a fluid path between the retract side and the control valve; the extend poppet valve is in a fluid path between the extend side and the control valve. The alternate movement of the piston in the cylinder alternately opens and closes the poppet valves, The circuit connects the poppet valves to the pilots and alternately applies and releases pressure to the pilots, causing the spool of the control valve to shift and apply inlet pressure to the piston on alternate sides.

Abstract: A mechanical pump having a unitary construction such that the fluid being pumped is prevented from leaking without requiring the use of discrete seal elements. The absence of discrete seal elements and integral coupling of various components of the pump substantially reduces the likelihood of failure of potential leak points. This allows the pump to operate continuously for a longer period and with greater reliability than previously utilized pumps. The pump can be utilized in a greater number of applications without requiring special design consideration for the fluid being pumped. The absence of discrete seal elements also reduces the cost and complexity of manufacturing the pump.

Abstract: A pumping system. The pumping system has a cylinder pump, a first group of switching devices, and a second group of switching devices. The first group of switching devices enable the cylinder pump to pump the liquid by feeding the gas provided by the gas source into the cylinder pump through a first ventilator according to a first enabling signal, and the second group of switching devices enable the cylinder to output the liquid by feeding the gas provided by the gas source into the cylinder pump through a second ventilator according to a second enable signal.

Abstract: A natural power water pumping system capable of conveying a water flow to any height includes a leverage capable of supporting a water source and moving upward and downward by using a water weight to produce a lever movement, a hydraulic pump pushed by the leverage to move reciprocally, and a water pump pushed by the hydraulic pump to perform a water drawing movement for drawing the water contained in a water source and conveying the water into a water storage tower located at any height.

Abstract: The invention relates to a process for continuously conveying shear-sensitive fluids, in particular polymer latices or plastics dispersions, which is accompanied by the taking of samples and the processing and analysis thereof, to a device for implementing the process and to a new double-long-stroke reciprocating pump.

Abstract: A double-acting hydraulic pressure intensifier includes a supply connection, a return connection, a high-pressure connection. An intensifier piston assembly includes a low-pressure piston arranged in a low-pressure cylinder and two high-pressure pistons connected to the low-pressure piston each arranged in a high-pressure cylinder. A switching valve assembly includes a displace able, hydraulically controlled valve element which on its two opposite sides in the direction of displacement has control pressure chambers with pressure application areas of different sizes, namely, a first control pressure chamber with a smaller pressure application area and a second control pressure chamber with a larger pressure application area. A stop plug is arranged between the second control pressure chamber and the supply connection.

Abstract: The linear pump (10,110) includes a housing (12, 112) and either two (20,22) or one (120) flexible bladders each within a pump housing and interconnected to respective end caps (30, 32, 130, 132, 134, 136). Upon movement of a movable end cap relative to a stationary end cap, the volume in each bladder may be variably controlled to pump blood or another selected fluid. Linear movement of the end caps may be controlled by an attractive or repulsive force between end caps. The pump (110) with a permeable bladder (120) may be used to pump wastewater.

Abstract: A piston pump with a piston in a pump chamber has, for controlling an inlet and an outlet of the pump chamber, in a partial region of its peripheral surface, a recess that can be aligned, by a rotational movement about its longitudinal axis, with the inlet or the outlet. By means of a stroke cam gear, the piston can be caused to carry out a lifting motion within the pump chamber. The stroke cam gear is formed by a peripheral guiding path of an adjusting element, which can be swiveled about a stationary axis of rotation, and a radial projection at the piston, which engages this guiding path.

Abstract: A pneumatically operated hydraulic pump includes a cylinder housing accommodating a main piston to subdivide the housing interior in two working chambers. The main piston is connected to a hydraulic piston for joint reciprocation so that the hydraulic piston can carry out a suction stroke when the main piston moves to one end position and a pressure stroke when the main piston moves to the other end position. Arranged laterally to the cylinder housing is a control mechanism for regulating a flow of working fluid alternately to the working chambers. The control mechanism includes a plastic valve casing for accommodating a control piston having opposite end faces of different size to define different effective areas and thereby realize reciprocation of the control piston by the working fluid. A slide shoe is guided in the valve casing for conjoint movement with the control piston.

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: An air driven diaphragm pump having two, opposed pumping cavities. A center section assembly between the pumping cavities includes a cylinder and a power amplifier piston. The power amplifier piston as well as the diaphragms are coupled with a common control shaft. A valve assembly is arranged with a manifold to receive pressurized air and distribute that air in alternating fashion to the sides of the power amplifier piston as well as to each of the diaphragms. By directing pressure to a side of the power amplifier piston facing the same direction as the diaphragm receiving pressure, an amplified pressure on a pump chamber is experienced. With the power amplifier piston being approximately twice as large as the diaphragm assembly, an amplification of three times the pressure on the pump chamber is experienced. Both pump chambers are able to operate to pump material.

Abstract: Pumps of this invention comprise a pump housing having at least one pressurizing chamber disposed therein, and a pressurizing member is disposed within the pressurizing chamber. The pressurizing member has a body with a solid imperforate head at one end, a thin-walled skirt extending away from the body head, and a flange extends circumferentially around a terminal edge of the skirt. A piston is disposed within the pump housing and is connected at one end to the pressurizing member. A piston gland is attached to the chamber and includes a diametrically positioned piston guide through which the piston is disposed. The flange is interposed between the chamber and the piston gland and includes sealing means to provide a fluid-tight seal therebetween. A pressurizing member plug is attached to the pressurizing member and has an outside wall surface that contacts and carries a variable portion of the skirt inside surface during reciprocating pressurizing member axial displacement.

Abstract: A compressor that uses liquefied gas at high pressure as a hydraulic medium for compressing gas from low pressure to high pressure. The compressor comprises a central liquid cylinder and two gas cylinders disposed adjacent opposite ends of the liquid cylinder that are axially aligned therewith. A piston assembly is disposed within the cylinders that comprises a central liquid drive piston and two compression pistons that are free to slide within the respective liquid and gas cylinders. A low pressure gas manifold coupled to the piston assembly, and a liquid-gas manifold coupled to opposite ends of the piston assembly. A liquid switching valve having a first port comprising a high pressure liquid inlet, a second port coupled to an inlet of the central liquid cylinder, a third port coupled to an outlet of the central liquid cylinder, and a fourth port coupled to the liquid-gas manifold.

Abstract: A pressure intensifier for pressurization of a medium is provided, comprising a low-pressure cylinder (1), in which a low-pressure piston (2) is axially displaceable, and two high-pressure chambers (3, 4) which are each arranged coaxially with and on separate sides of the low-pressure cylinder (1) and which each exhibit an axially displaceable high-pressure piston (9, 10) which are secured to the low-pressure piston (2). A channel (16), provided with a nonreturn valve (17), connects the two high-pressure chambers. The area of one high-pressure piston (9) may be larger than the area of the other high-pressure piston (10).

Abstract: An air driven diaphragm pump having two, opposed pumping cavities. A center section assembly between the pumping cavities includes a cylinder and a power amplifier piston. The power amplifier piston as well as the diaphragms are coupled with a common control shaft. A valve assembly is arranged with a manifold to receive pressurized air and distribute that air in alternating fashion to the sides of the power amplifier piston as well as to each of the diaphragms. By directing pressure to a side of the power amplifier piston facing the same direction as the diaphragm receiving pressure, an amplified pressure on a pump chamber is experienced. With the power amplifier piston being approximately twice as large as the diaphragm assembly, an amplification of three times the is pressure on the pump chamber is experienced. Both pump chambers are able to operate to pump material.

Abstract: A pressure medium operated device generating to-and-fro motion to one or several pistons or a similar motion transmitting arm. The device includes a primary piston to which motion is brought in transmitting pressure medium alternately to both sides of the piston and control valves located inside the primary piston for controlling the pressure medium which moves the primary piston.

Abstract: A modular air-driven pump includes an air motor and various sized fluid pumps which are interchangeably mountable to the air motor. The air motor includes first and second bulkheads, a motor cylinder held between the first and second bulkheads, and a motor piston within the motor cylinder. An air control system supplies air from an air inlet to the motor cylinder alternately on each side of the motor piston while venting the motor cylinder on an opposite side of the motor piston to an air outlet to reciprocate the motor piston. The first bulkhead has an opening substantially coaxial with the motor cylinder and first and second cylindrically-shaped and coaxial recesses at an outward side of the first bulkhead which surround the opening The second recess has larger diameter and a smaller depth than the first recess so that they are stair stepped.

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.