Abstract: An air driven double diaphragm pump has two opposed pumping cavities with diaphragms extending thereacross. A shaft extends between the diaphragms and through an actuator housing. The housing includes a control valve assembly having a control valve to direct pressurized air to one or the other of the dual pumping cavities and two relief valves which cooperate with the pump shaft position to release air from one end or the other of the control valve for the shifting thereof. Shuttle valve elements are positioned between the control valve and the pumping chambers. The shuttle valve elements are slidably positioned within the valve cavities to move between extreme positions under the pressures within the input and the pumping cavity. In one extreme position, the pumping cavity is in communication with an exhaust having a tapered passage. In the other, the exhaust is cut off and pressurized air is able to pass through a one-way valve in a passageway through the shuttle valve element to charge the pumping chamber.

Abstract: A positive displacement liquid-delivery apparatus includes a positive displacement pump 110 and a differential pressure control unit 142. The positive displacement pump 110 includes a liquid-delivery chamber 128 having a watertight housing 122 with one part formed of a flexible diaphragm 124, and a diaphragm driver 136 linked to the diaphragm 124 for deforming the same to discharge fluid from the liquid-delivery chamber 128. The differential pressure control unit 142 uniformly controls the differential pressure inside and outside the diaphragm 124 during the pumping process.

Abstract: A liquid pump for pumping groundwater samples from small diameter sub-terrain wells. The pump comprises a tubular casing having swaged ends and provided with inlet apertures on its side wall, a top cap and a bottom cap each provided with a bladder mandrel, a coil spring biasing the caps, a flexible bladder separating the interior of the pump into a liquid chamber and a gas chamber, and a pair of poppet valves preventing backflow of the pumped liquid. The pump is actuated by alternately pressurizing and de-pressurizing the actuating gas, preferably air, in the gas chamber causing the bladder to alternately contract and relax. The bladder is formed with reduced diameter ends that allows for an increased stroke volume of the pump. The pump is operated by a precision dual range controller, specifically adapted for “low flow” sampling.

Abstract: A pump, for moving a pumped fluid using a pumping fluid, comprising an outer housing defining an interior volume. A compressible main tube, having an interior space, is located within the outer housing. Inlet and exit valves, both having internal check valves, are in communication with the interior space of the compressible main tube. The outer housing is selectively filled with pressurized pumping fluid through a drive intake to compress the main tube and force pumped fluid contained therein out through the exit valve. The pressurized pumping fluid is then released through a bleeder valve to relieve pressure upon the main tube, allowing it to expand, and causing it to draw pumped fluid into its interior space through the inlet valve. Reiteration of these steps is controlled by a solenoid valve which selectively allows or prevents flow of the pumping fluid through the drive intake into the internal volume of the outer housing.

Abstract: An apparatus and method for pressure processing a pumpable substance, such as a pumpable food product or slurry. In one embodiment, the apparatus includes a pressure vessel having an inlet valve toward one end and outlet valve toward the other end. A flexible bladder is coupled between the inlet and outlet valves for receiving the pumpable substance. The pressure vessel can further include a high-pressure inlet port for receiving high-pressure fluid that biases the membrane inwardly to pressure process the pumpable substance. The pumpable substance is then removed from the vessel through the outlet valve.

Abstract: A water system uses a pressure tank of an extremely small size. Said pressure tank is of extremely small diameter and can be a variety of lengths. This pressure tank has an opening at one end for fluid inlet and an opening on the opposite end for fluid outlet. This pressure tank is placed inside the well casing or inside the fluid reservoir to protect it from freezing and vandals as well as hidden from landscaping efforts. The pressure tank utilizes a flexible diaphragm to separate the air chamber from the fluid chamber. Said diaphragm to be open at both ends and tube shaped to allow installation in a small diameter housing to be used inside small diameter well casing.

Abstract: According to the present invention, a device body casing 17 has a liquid chamber 20a for temporarily storing a liquid to be transported by a pump, a gas chamber 20b, and an extendably and contractibly deformable pulsation suppression diaphragm 18, which separate them. The device body casing 17 having an aperture 27 so as to communicate with gas chamber 20b, is detachably engaged with a valve case 23. The valve case 23 is provided with an automatic gas supply valve mechanism 33 and an automatic gas exhaust valve mechanism 34, which restrict the amount of the extendable and contractible deformation of the pulsation suppression diaphragm 18 within the predetermined range, so that a liquid pressure inside the liquid chamber 20a and an atmospheric pressure inside the gas chamber 20b may balance each other when the discharge pressure of the pump is fluctuated. The automatic gas exhaust valve mechanism 34 is provided with a gas exhaust port 32, a gas exhaust valve element 43, and a slider 48.

Abstract: An apparatus and method for pressure processing a pumpable substance, such as a pumpable food product or slurry. In one embodiment, the apparatus includes a pressure vessel having an inlet valve toward one end and outlet valve toward the other end. A flexible bladder is coupled between the inlet and outlet valves for receiving the pumpable substance. The pressure vessel can further include a high-pressure inlet port for receiving high-pressure fluid that biases the membrane inwardly to pressure process the pumpable substance. The pumpable substance is then removed from the vessel through the outlet valve.

Abstract: As tube-phragm pump includes a pump head (1) and an electromagnetic driver (2). The pump head (1) includes a cylinder (21) having a cylindrical space formed therein, and a cylindrical flexible tube (22) arranged coaxially within the cylindrical space of the cylinder (21). The outer space between the tube and the cylinder defines an actuator fluid space to be filled with an actuator fluid, and the inner space within the tube defines a pump chamber for conveying an object fluid. The pump head also includes an intake valve (31) attached to one end portion of the flexible tube (22) and a discharge valve (42) arranged at the other end portion of the flexible tube (22). The electromagnetic driver (2) includes a plunger (71) arranged reciprocally movable in the axial direction, an electromagnet for periodically attracting the plunger (71) to drive it in the axial direction reciprocally, and diaphragm (52).

Abstract: An air-operated pump for groundwater sampling and other applications includes a removable cartridge coupled to a manifold configured to receive air-inlet and fluid-discharge tubes from an above-ground location. The removable cartridge may be in the form of a bellows or bladder, and may be removably attachable to the pump body through a press fitting. In contrast to prior implementations, the pump body features a manifold with fittings enabling the air-inlet and fluid-discharge tubes to be respectively inserted and sealed into the air-inlet and fluid-discharge ports. In the preferred embodiment, the fittings are such that the associated tubes cannot be removed without modification. For example, the fittings may include a grab plate associated with one or both of the air-inlet and fluid-discharge ports. Each grab plate includes an aperture with finned serrations such that through proper sizing of the plate features and associated tubing, the tube(s) may be inserted and sealed through appropriate compression.

Abstract: A pump device for pumping liquid foodstuff includes a pump housing having an inlet and an outlet for pumping the foodstuff therethrough. A pump body is disposed within the pump housing having an elastic member which contains a predetermined volume of pressurized liquid. The pressurized liquid expands the elastic member from an unpressurized normal shape to a prestressed shape. The volume of liquid contained within the elastic member remains substantially fixed while the elastic member expands from its prestressed shape to a stretched shape to pump a predetermined amount of foodstuff out of the outlet.

Abstract: A pump of the type used for groundwater sampling, including the removal of gasoline or other hazardous materials, utilizes a cartridge which, in the preferred embodiment, is easily removable for bailing and other operations. The cartridge may be in the form of a flexible-walled bottle or other device, including a corrugated bellows, thereby providing a number of advantages over conventional designs, including the potential for truly automatic operation and higher throughput. The open end of the bellows or other collection device according to the invention is also preferably positioned with the open end oriented upwardly during normal operation, thereby allowing trapped gas to escape. Air-supply and fluid-discharge lines are coupled to the pump body through a pump head from an above-ground location. If removable, the bellows or other fluid collection device is fastened to the pump head within a shell which is removably attached to the pump head.

Abstract: A pump includes a housing, an enlarged block, an inlet fluid conduit, an outlet fluid conduit and a flexible diaphragm. The housing defines a chamber having an inlet and a spaced apart outlet. The enlarged block is located in the chamber and has a first region and a spaced apart second region. The inlet fluid conduit extends into the chamber, terminates at or near the first region of the enlarged block and has at least one fluid inlet aperture in the chamber. The outlet fluid conduit extends into the chamber, terminates at or near the second region of the enlarged block and has at least one fluid outlet aperture in the chamber. The flexible diaphragm is located in the chamber and is moveable between a first position in which a working fluid from the inlet fluid conduit is prevented from passing toward the outlet fluid conduit and a second position in which the working fluid from the inlet fluid conduit is allowed to pass toward the outlet fluid conduit.

Abstract: To sample liquids containing volatile materials, the liquid is pumped through a syringe needle into a container until the container overflows. The needle is removed slowly and the container is automatically closed as the needle is withdrawn, wherein liquid flows upwardly continuously as the needle is withdrawn through an opening. The cap for the container includes a closure having a valve opening extending upwardly and sized to narrowly receive a syringe in a perpendicular valve member opening. The valve member includes a flat member on one end adapted to be gripped by a cam follower for opening and closing of the valve opening in coordination with the movement of the syringe.

Abstract: An air driven double diaphragm pump has two opposed pumping cavities with diaphragms extending thereacross. A shaft extends between the diaphragms and through an actuator housing. The housing includes a control valve assembly having a control valve to direct pressurized air to one or the other of the dual pumping cavities and two relief valves which cooperate with the pump shaft position to release air from one end or the other of the control valve for the shifting thereof. Shuttle valve elements are positioned between the control valve and the pumping chambers. The shuttle valve elements are slidably positioned within the valve cavities to move between extreme positions under the pressures within the input and the pumping cavity. In one extreme position, the pumping cavity is in communication with an exhaust having a tapered passage. In the other, the exhaust is cut off and pressurized air is able to pass through a one-way valve in a passageway through the shuttle valve element to charge the pumping chamber.

Abstract: A pump having a semi-rigid flexible outer tube with a sealed top and a sealed bottom, check valves at the top and bottom such that the outer tube is in fluid communication with the working fluid, an inner tube concentrically disposed within the outer tube, and a controlled source that applies pressure to expand the inner tube to apply a force to the working fluid in the annulus defined by the inner and outer tubes is used to pump viscous materials and/or slurries from the bottom of small diameter wells. The tubes are made from nonmetallic, elastic materials and can be inexpensively manufactured.

Abstract: The invention generally concerns a submersible well pumping system comprising an axially elongated housing having a diameter less than the bore hole of the well, a multi-chamber hydraulically driven diaphragm pump, suspended in the well using coiled tubing, in which the coiled tubing contains one or more electrical cables to provide power to the pump from the surface. The pump is driven by a self-contained, closed loop hydraulic system, activated by an electric or hydraulic motor. The flow of working fluid into and out of the pumping chambers is controlled by a two state snap-acting valve, in turn controlled by a sensor which senses the proximity of the working diaphragm and generates an electrical signal to change the state of the valve, typically when either diaphragm reaches the bottom of the pumping stroke.

Abstract: An improved method and apparatus for pressure processing a pumpable substance are shown and described. In a preferred embodiment, a valve is coupled to a source of a pumpable substance and a pressure vessel, the valve being movable to a first, second and third position. When the valve is in a first position, an inlet port in the valve is aligned with a passageway that is open to the pressure vessel. When the valve is in the second position, the valve body seals the passageway, and when the valve is in the third position, an outlet port provided in the valve is aligned with the passageway.

Abstract: A positive displacement pump includes a deformable hollow member for delivering a subject liquid by a cycle of contraction and restoration of its volume, a casing which contains the hollow member, and a pressurizing device for supplying and evacuating a hydraulic liquid in an annular space between the casing and the hollow member. The supplying of hydraulic fluid causes the contraction of the hollow member, and the evacuating of the hydraulic fluid causes the restoration (expansion) of the hollow member. A guide structure contacts and deforms the outer circumferential portions of the hollow member as the hollow member continues to expand to determine an initial contraction position of the hollow member. That is, a particular direction of contraction of the hollow member is set by the guide structure. Drive means periodically vary the circumferential position of the guide means relative to the hollow member to vary the initial contraction position of the hollow member.

Abstract: A pneumatically actuated reciprocating fluid pump and spool valve combination is pneumatically shifted by pressurized air that exhausts from a respective pressurized bellows, diaphragm, or piston chamber, as the bellows, etc. nears the end of its pressure stroke (the exhaust stroke of the pumped fluid). This pressurized air exhausts from the bellows chamber via a shift piston and canister mechanism that seals on the face of the shift canister, rather than on its periphery. The pressurized air exhaust from the bellows chamber acts on the end of the valve spool element to shift the spool element to its opposite position, which reverses the application of pneumatic pressure and atmospheric exhaust between the two bellows chambers to actuate the reciprocating pump.

Abstract: A pneumatically actuated reciprocating fluid pump and shuttle valve combination is pneumatically shifted by pressurized air that exhausts from a respective pressurized bellows, diaphragm, or piston chamber, as the bellows, etc. nears the end of its pressure stroke (the exhaust stroke of the pumped fluid). This pressurized air exhausts from the bellows chamber via a shifting piston and cylinder mechanism within the bellows chamber that opens the bellows chamber at a specified location or point in the pump pumping cycle. The pressurized air exhaust from the bellows chamber acts on the end of the shuttle valve spool element to shift the spool element to its opposite position, which reverses the application of pneumatic pressure and atmospheric exhaust between the two bellows chambers to actuate the reciprocating pump.

Abstract: A downhole oil well pump apparatus is useful for lifting oil from the lower end of production tubing adjacent the formation to the earth's surface. The apparatus includes a tool body that can be lowered into the oil well to a level that contains oil that is to be pumped. Packers are used to close off the tubing below the tool body. The tool body includes a bladder that flexes between expanded and contracted positions. The tool body includes a production channel for transmitting oil from the bladder to the earth's surface. Valves above and below the bladder control fluid flow from the bladder to the production channel. The bladder is driven with pressurized gas such as butane.

Abstract: A system for utilizing the expansion of water as the water is transformed from a liquid state to a solid state includes a rigid outer container and a flexible inner bladder received centrally within the outer container. Hydraulic fluid is received within bladder, and water is disposed between the bladder and outer container. The hydraulic fluid is pressurized as the water is lowered in temperature to a freezing temperature. The pressurized fluid may be stored for selective release from the bladder to produce work utilizing the energy of the pressure within the hydraulic fluid.

Abstract: A metallic bellows pumps for pumping corrosive, caustic, acidic or toxic fluids which includes a casing with an annular bellows portion within said casing with one end affixed to the casing and the other secured to a piston closure plate with the plate and bellows being moveable toward and away from the fixed end to receive and discharge a fluid with reciprocating movement of the bellows within the casing, and power means to activate and control the movement of the bellows within the bellows pump.

Abstract: An apparatus for transporting fluids from a reservoir or source to a remote point of use wherein a multiple-chambered slave unit, when hydraulically actuated through a single conduit communicating with a distant master pressure-generating unit, will upon relief of the actuating pressure, contribute to the conduit, fluid aspirated from the source in addition to the original volume of actuating fluid.

Abstract: A temporary patient ventilator is a modified version of the widely used air-mask-bag-unit (AMBU). The modified AMBU has guy wires attached to the inside resilient walls of the airbag which are pulled to collapse the airbag. A drive is used to alternately pull on the guy wires and then release them automatically. This new automated airbag unit system allows hands free operation of the ventilation device for short periods of time. The drive has rechargeable batteries so that the temporary ventilator is completely mobile.

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 fluid pump, particularly an extracorporeal blood pump, comprises a pump chamber (1) having an inlet opening (2) and an outlet opening (3), each connected to a respective non-return valve (4,5). The inlet (1) and the outlet (2) are movable in relation to each other and connected to a drive means (6) for periodic displacement of the inlet and the outlet alternately towards and away from each other, the interior volume of the pump chamber (1) being variable in correspondence with the relative distance between the inlet and the outlet. The pump chamber (1) is on its outside influenced by the surrounding pressure and has a wall of a flexible material constructed in such a manner that the pump chamber will collapse and reduce its volume, if the interior pressure in the pump falls below the surrounding pressure by an amount greater than the required opening pressure difference for the nomn-return valve connected to the inlet.

Abstract: A viscous fluid pressure-feed apparatus which feeds and drains a slurry of a highly viscous fluid in a casing to a filter press, or the like inside, or outside, an elastic film by pressurizing the elastic film through the feed/drain operation by an oil pressure generation apparatus outside, or inside, the elastic film which is supported by the casing. Particularly, a mechanical press-in apparatus such as a screw feeder is disposed at a suction port of the viscous fluid into the elastic film disposed in the casing so as to operate in synchronism with expansion and contraction of the flexible film and to compulsorily supply the slurry having a high viscosity from a slurry tank. Furthermore, a gas reservoir chamber is added to the casing and a gas exhaust valve is disposed in the gas reservoir chamber.

Abstract: An apparatus and a method of use are disclosed which assist in pulsating blood to a patient during cardiopulmonary bypass surgery and assists in weaning a patient after cardiopulmonary bypass surgery by counterpulsating. The apparatus includes a blood pump with a collapsible bladder and a bladder support ring with a plurality of openings to permit the entering of continuous flowing blood, the exiting of a pulsatile blood flow and the release of any air bubbles trapped within the blood supply. The pulsating blood flow is created by the compression of the collapsible bladder when filled with blood. The method consist of connecting the apparatus to the aortic return line of a cardiopulmonary bypass circuitry and to the aortic cannula of the patient. The apparatus is positioned near to the patient to maximize pulsatile output. Compression of the bladder can be synchronized to create the physiologic blood pressure of the patient or to counterpulsate with the patient's heart.

Abstract: A pneumatic pumping device incorporating a movable valve such as a bellows, or a diaphragm, driven by air back pressure in a cylinder so that a liquid is drawn in and discharged by reciprocating movement of the movable valve, and in which surfaces contacting the liquid on the initial and external parts of the pumping device are formed of either a single substance or a compound of a fluororesin such as PTFE, PFA, CTFE in order to feed strong acid liquid or strong alkaline liquid without corrosion on components of the pumping device.

Abstract: A floating layer recovery apparatus is disclosed for selectively pumping a liquid floating on groundwater. The apparatus preferably includes a first float which is buoyant in the floating layer attached by a guide to a bottom float which has neutral buoyancy in the groundwater. A middle float is slidably attached to the guide for upward and downward movement between the first and bottom floats. The middle float being an inlet is constructed to have an effective density in the assembly such that it rests at a point where its inlet is near the bottom of the floating layer. Coiled conduits disposed above and below the bottom float carry the floating layer liquid received by the inlet to a pump disposed below. The pump then pumps the floating layer liquid from the conduit to the ground surface. In a preferred embodiment, more precise control over the level of the inlet port is achieved by means of an adjustable inlet port means.

Abstract: A liquid pump apparatus is disclosed for pumping groundwater samples, contaminants or other fluids from a well, monitoring site, tank, vessel, or the like. The pump apparatus is applicable in systems including dedicated wellhead assemblies permanently installed at such wells or monitoring sites in order to minimize cross-contamination from site to site. Another application of the pump apparatus for recovery, collection and control system for cleanup of leachate or other liquid material or contaminated groundwater from a landsite is also disclosed. The pump apparatus according to the invention includes check valve means adapted to accommodate vertical, horizontal, non-vertical, or even inverted pump orientations, without requiring a high level of static head in order to function properly.

Abstract: An apparatus for driving a sampling pump disposed in a monitoring well comprises a structural support member including a container for pressurized gas; a platform having a top surface and supported by the structural member; an air compressor secured on the top surface and operably connected to the container; a venturi for generating a vacuum from the pressurized gas in the container; an engine for driving the air compressor; and a controller operably connected to the container, the generating means and the sampling pump for alternately directing compressed air and vacuum to the pump to thereby operate the pump.

Abstract: An apparatus for managing liquid under pressure having a first volume containing a liquid at a first pressure and a second volume containing liquid at a second, lower, pressure and energy storage means to receive and store energy derived from said first volume as a result of said first volume containing liquid under said first pressure and using said stored energy to increase the pressure in the second volume.

Abstract: A method of producing a polyurethane foam comprising the steps of dissolving rapidly and substantially completely a non-condensible non-reactive gas in a liquid isocyanate component or a liquid polyol component or both while the isocyanate and polyol components are maintained separate from one another, while controlling the flow of the non-reactive gas to maintain a predetermined dissolved gas to liquid ratio, and while maintaining the component in which the nucleating agent is being dissolved under pressure sufficient to maintain the gas in solution and to hold substantially constant the dissolved gas to liquid ratio and mixing the previously separated isocyanate and polyol components together while reducing the pressure to nucleate the dissolved gas in the isocyanate and polyol components and while impinging liquid streams of the composition together thereby enhancing mixing and permitting the mixture to foam so as to form a fine celled polyurethane foam.

Abstract: A self-cycling pump apparatus wherein a valve functioning as a pump cycling device is connected to the pump so that it may be lowered together with the pump to a submerged position in a sub-surface fluid for lifing the sub-surface fluid to ground level. Separate drive air supply and exhaust tubes are connected to the cycling valve, the valve permitting the drive air supply line to communicate with a gas chamber of the pump during a pressurizing phase of the pump cycle, and alternately permitting the exhaust tube to communicate with the gas chamber of the pump during a venting phase of the pump cycle. A timing device for timing the sequence of the cycle phases is connected with the cycling valve. The timing device may be mounted adjacent the cycling valve, so that the pump, the cycling valve and the timing device may be lowered to the submerged operating position as a single unit.

Abstract: A self enclosed filter pump system (10) is provided to deliver precise quantities of selected fluids. The system (10) includes a pump assembly (12) of a pneumatically controlled type and a modular filter and fluid bag assembly (14) adapted to mate with the pump assembly (12) during use. The filter and fluid bag assembly (14) is a flexible component which includes a container portion (20) for storing enclosed fluid (16) and an extension portion (22) for mating with the pump assembly (12). A series of fluid flow passages (35) create a fluid flow path from the storage chamber (34) to a first value bubble (36), a pump/filter bubble (46), a second valve bubble (52) and an outlet port (56). A filter membrane (48) may be secured within the pump/filter bubble (46) to filter the fluid (16) to remove particulate matter. The various bubbles (36, 46 and 52) are occluded and opened by pneumatic pressure applied to matching chambers (78, 88 and 94) in the pump housing (62).

Abstract: An elastic rebound pump comprises a flexible inner tube having a substantial elastic rebound surrounded by a pump housing. The inner tube defines an inner chamber and the pump housing forms an outer chamber for confining a pump fluid. The pump allows pressurized gas or hydraulic fluid into the outer chamber to collapse the inner tube thereby discharging liquid from the inner chamber through an outlet opening. The pump alternately releases the pressurized fluid from the outer chamber thereby allowing the inner tube to rebound to a full configuration and draw liquid into the inner chamber through the inlet opening. By repeatedly allowing pump fluid into the outer chamber and sequentially releasing the pump fluid from the outer chamber, the pump produces a substantially steady flow of liquid. An extraction pump system includes the elastic rebound pump for removing liquid hydrocarbons from ground water collected in a well.

Abstract: A bellows pump which is disclosed herein has two bellows made of a plastic material and provided with liquid inlet and outlet ports for transferring a liquid by expanding and contracting the bellows. The bellows pump comprises cylinder cases in each of which the bellows is vertically expandably and contractably contained and mounted at its access port side to a ceiling of said cylinder cases, gas pumping means for alternately feeding a compressed gas from a lower end thereof into the cylinder cases, a pair of rods passed through bottoms of the cylinder cases and fixed to the lower ends of the bellows, and adapted to be moved in response to the expansion and contraction of the bellows, and actuating means adapted to be operated in response to the up and down movement of the rods.

Abstract: A pump comprising a casing (1) having interior space in which there is provided a flexible hose (2) mounted for reciprocations having one end (5) thereof which is turned inside out and secured along the perimeter to the inner wall of the casing (1), and the other end thereof which is closed so as to sealingly divide the interior space of the casing (1) into two chambers (6,7) of which one chamber (7) communicates with a source (12) of fluid being pumped and with a delivery line. In order to move the flexible hose (2) in one direction, its closed end is secured to a drum (3) operatively connected to a motor and installed in one of the chambers (6,7), and movement in the opposite direction is effected under the action of working fluid pressure built-up in one of the chambers (6,7).

Abstract: A trapped air displacement device includes a flexible gas fillable bladder 30 and a device 34 for inserting the bladder 30 into a bottle bore 8 of a turbine or generator shaft 14. The flexible bladder 30 displaces the air trapped in the bottle bore region 8, so that it will escape along the slightly tilted surface of the shaft 14. A protective tube 34 is provided for the fragile bladder 30 during positioning. The bladder 30 can be inflated through an inner tube 32. The bladder 30 can also be inflated by sealing a small amount of gas in the bladder 30 and tube 30 and applying a vacuum to the shaft 14.

Abstract: The device for injecting a fluid into a network comprises storage and supply means (1, 2) for the fluid to be injected, an injector (11) and a proportioning unit (7) to obtain a constant injection ratio. The injector (11) comprises two housings (12) each provided with a fluid-tight pocket (15) of variable volume. Said injector further comprises two distributors (16,17): a first distributor (16) providing for the filling of a pocket (15a) with the fluid to be injected and simultaneously for the emptying of the other pocket (15b): a second distributor (17) providing in parallel for the filling with an auxiliary fluid of the housing (12b) containing the pocket (15b) being emptied and simultaneously for the emptying of the other housing (12a). The injector (11) finally comprises actuation means adapted to generate in synchronism a switching of the distributors (16, 17) so as to invert the function of the housings (12) and of the pockets (15).

Abstract: A pneumatic pumping device incorporating a movable valve such as a bellows, are diaphragm, driven by air back pressure in a cylinder so that a liquid is drawn in and discharged by reciprocating movement of the movable valve, and in which surfaces contacting the liquid on the internal and external parts of the pumping device are formed of either a single substance or a compound of a fluororesin such as PTFE, PFA, CTFE in order to feed strong acid liquid or strong alkaline liquid without corrosion on components of the pumping device.

Abstract: To pump liquid using a source of gas pressure, a gas-operated positive displacement pump includes an outer tubular rigid wall and an inner movable wall forming a cylindrical liquid chamber which communicates with a liquid inlet and a liquid outlet, both including check valves to permit liquid to flow into the liquid chamber through the liquid inlet and out of the liquid chamber through the liquid outlet only. Within the cylindrical liquid chamber, is a tubular gas chamber formed of an elastomeric wall capable of contacting the movable wall of the liquid chamber to compress it to cause liquid to leave and pull it back to draw liquid into the chamber, the inner air chamber being adapted to receive gas under pressure and then vented to the atmosphere alternatively. Gas between the movable wall and elastomeric wall may be squeezed into the gas chamber and held there to form a vacuum connection between the movable wall and elastomeric wall.

Abstract: An internal combustion engine is connected to a supercharger which is powered by exhaust energy for compressing and feeding of the air charge. The supercharger has at least one exhaust chamber and one air compression chamber both having an intake and an output. A membrane is sandwiched between the two chambers for changing the volume in the charger. The membrane is comprised of tightly fitted single elements which are movable relative to each other and are made from a heat resistant material. The membrane is driven by exhaust gases entering into the exhaust chamber from the internal combustion engine such that the movement of the membrane is synchronized with piston movement of the internal combustion engine to move charged air from the air charge chamber to a piston cylinder.

Abstract: An apparatus including dispensers connected to a hopper enable discrete portions of filler material to be introduced into individual containers as they pass through a food canning operation. The dispensers are connected to a hopper and are operable to dispense discrete amounts of filler material that are stored in the hopper. The amount of filler material to be introduced into the containers brings a container weight to within desired tolerances of a selected target weight. The containers are provided to the dispensers by a timing screw that extends adjacent to a conveyor that conveys the containers. The timing screw is synchronized with a transfer gear that directs each container onto a platform below the dispensers.

Abstract: An extracorporate ventricular support system includes a two bladder pump employing continuous gravity fill to the first bladder, while the second bladder is pneumatically driven to produce a pulsatile blood flow. A processor responds to air flow in the pneumatic drive line to control the pump through an electromagnetic valve supplying pressurized air. The program controls the output of blood volume per stroke to meet a target value.

Abstract: A fluid transfer module is provided with multiple flow paths for transferring multiple fluids. The module is particularly useful in downhole pumps for passing oil upwardly through a central passage and for passing gas up or down through concentric passages around the central passage. The module also can be used for water or fuel, particularly for downhole steam generation. The module includes an elongate housing or production tubing with an inner coupling having an attached, elongate inner tube which together form a central passage extending substantially the length of the housing. An outer coupling with an attached, elongate outer tube form an inner concentric passage with the inner coupling and tube and an outer concentric passage with the housing. The concentric flow paths are less restrictive to the flow of fluids therethrough.

Abstract: A fluid sampling apparatus is disclosed for withdrawing samples of groundwater or other fluids from a well or other monitoring site. The apparatus preferably includes pump means, conduit means and a wellhead assembly that are substantially permanently installed at such well or monitoring site and are thereby dedicated thereto in order to avoid or minimize cross-contamination of samples from site to site. The apparatus preferably also includes a removable and portable controller means adapted for easy and convenient transportation and connection to such dedicated fluid sampling components at various wells or monitoring sites.The questions raised in reexamination request No. 90/001,494, filed Apr. 18, 1988, have been considered and the results thereof are reflected in this reissue patent which constitutes the reexamination certificate required by 35 U.S.C. 307 as provided in 37 CRF 1.570(e).