Abstract: A pump for conveying a fluid comprises a pump housing (1) with a fluid inlet (26), a pumping chamber (4), which has a flow connection to the fluid inlet (26), and a fluid outlet (25), which has a flow connection to the pumping chamber (4). The pump furthermore has a drivable pump body (2), which at least partially limits the pumping chamber (4), and a pump body drive device. The pump body drive device comprises a pump body drive mechanism (3) which is connected to the pump body (2) and which comprises a first drive magnet (16) and is moveable along a displacement path, and a second drive magnet (11) arranged adjacent to the pump body drive mechanism (3) for moving the pump body drive mechanism (3) along the displacement path. The pump also comprises an actuable fixing device (33) for fixing the pump body drive mechanism (3), which, in a release position, releases the pump body drive mechanism (3) and, in a fixing position, fixes the pump body drive mechanism (3).

Abstract: Embodiments of the present invention relate generally to certain types of reciprocating positive-displacement pumps (which may be referred to hereinafter as “pods,” “pump pods,” or “pod pumps”) used to pump fluids, such as a biological fluid (e.g., blood or peritoneal fluid), a therapeutic fluid (e.g., a medication solution), or a surfactant fluid. The pumps may be configured specifically to impart low shear forces and low turbulence on the fluid as the fluid is pumped from an inlet to an outlet. Such pumps may be particularly useful in pumping fluids that may be damaged by such shear forces (e.g., blood, and particularly heated blood, which is prone to hemolysis) or turbulence (e.g., surfectants or other fluids that may foam or otherwise be damaged or become unstable in the presence of turbulence).

Abstract: The present invention is a central flow double diaphragm pump controlled by an operating fluid distribution module on the topside. A pivoting sealing member with a protruding wing pivots on the low friction seal of the operating fluid distribution module. The pumped fluid chambers' inlet and outlet ports are positioned at different levels within the projected section of each chamber. The four check valves, for example, but not necessarily, ball valves, are arranged in a special configuration. All four check valves, two suction check valves and two discharge check valves, are located in the centre of the pump's wetted body and are accessible from the topside of the wetted body. The two suction check valves are located close to the pump inlet, above the shaft, and the valves' outlets connect immediately into the diaphragm chambers. The two discharge check valves are located close to the pump outlet, below the shaft, and the valves' inlets connect immediately from the diaphragm chambers.

Abstract: A diaphragm pump, in which a fluid moves at least a first piston of a first piston/cylinder system back and forth, the first piston being mechanically connected to at least one other hydraulic piston and the hydraulic piston driving at least one diaphragm by a hydraulic medium.

Abstract: An air operated double diaphragm pump comprises an integrated electric generator and an air efficiency device. The integrated electric generator increases the portability of the air operated double diaphragm pump. The air efficiency device varies the amount of compressed fluid entering the pump between a high volume and a low volume dependent upon the velocity and position of the pump's diaphragm assemblies to optimize the pump's efficient use of the compressed air.

Abstract: A diaphragm circulator for liquid material having an internal circuit provided with at least one material intake orifice for discharging the material. The circulator body defines a propulsion chamber with rigid walls between which a deformable diaphragm is placed in such a way that the edge thereof is adjacent to the intake orifice and the edge is adjacent to the discharge orifice for forming a ripple carrier. A diaphragm-exciting member is arranged on the side of the intake orifice for producing a reciprocating motion on the corresponding diaphragm edge in such a way that the ripple is generated and is provided with the circulator rigid walls which are arranged inside free ripple amplitude envelope surfaces extending along the diaphragm.

Abstract: The present invention relates to a separation type pneumatic dual partition membrane pump, which comprises a pump body and an external pneumatic control valve which is separately installed. Through the operation of the external pneumatic control valve, the main shaft of the pump body and the valve rod of the external pneumatic control valve are reciprocally moved, and the two partition membranes respectively generate stretch and compress motions for changing the volume of each liquid room in the pump body so as to perform the pump stroke and the liquid suction stroke to the liquid.

Abstract: A pneumatic micropump is provided. The pneumatic micropump includes a fluidic channel layer, an upper substrate, a lower substrate, an upper membrane and a lower membrane. The fluidic channel includes a fluid inlet a reservoir, and a fluid outlet, wherein the fluid passes through the fluid inlet, the reservoir and the fluid outlet, successively. The upper substrate includes an upper pneumatic chamber facing the reservoir. The lower substrate includes a lower pneumatic chamber facing the reservoir. The upper membrane is disposed between the upper pneumatic chamber and the reservoir, and the lower membrane is disposed between the lower pneumatic chamber and the reservoir.

Abstract: The present invention relates to a pump device with a first diaphragm pump head having two or an integral multiple of two fluid delivery chambers and diaphragms associated therewith, which are hydraulically coupled to a second diaphragm pump head. The second diaphragm pump head has two additional fluid delivery chambers and additional membranes associated therewith, which are drivable by a double-acting piston via associated diaphragm control chambers, a refilling valve being connected in each case to the diaphragm control chambers and the diaphragm control chambers being temporarily impinged with a diaphragm control pressure, which is greater than atmospheric pressure, using the refilling valve. The piston may thus be activated using a relatively small force to achieve a delivery action.

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: This pump comprises a chamber and an annular pumping diaphragm secured to the said chamber and the inner edge of which is secured to a central drive part. This diaphragm has a convex domed profile so that its expulsion stroke results essentially in the energy-generating flexing of the intake stroke. The rigidity of the diaphragm is chosen so that the absolute pressure of the chamber lies within the following range: Patm?(|?Pvalve—in|+|?P?h—in|+|?Ppd|)?P>Pvap where: Patm=atmospheric pressure, Pvap=vapour pressure of the pumped fluid, ?Pvalve—in=pressure difference between the upstream and downstream side of the inlet valve for opening it, ?P?h—in=pressure difference in the upstream pipe between its distal end and the upstream side of the inlet valve as a result of the weight of the column of fluid, ?Ppd=pressure drop in the upstream pipe for the desired flow rate.

Abstract: A pressure driven pumping system includes a piston disposed within a first bore of a housing to separate a process chamber from a working chamber. A rod member coupled to the separating member extends into a reduced pressure chamber. The piston has a first face exposed to the process chamber and a second face exposed to the working chamber. The second face has an effective area less than an effective area of the first face. The housing may be placed in seawater at a selected depth. The process chamber can be in fluid communication with a well to pass well fluid into the process chamber at well pressure to move the piston, to discharge seawater from the seawater chamber. The working fluid, typically seawater in a subsea application, is pumped into the working chamber to move the piston, which discharges well fluid from the process chamber.

Abstract: A pumping cassette including a housing having at least two inlet fluid lines and at least two outlet fluid lines. At least one balancing pod within the housing and in fluid connection with the fluid paths. The balancing pod balances the flow of a first fluid and the flow of a second fluid such that the volume of the first fluid equals the volume of the second fluid. The balancing pod also includes a membrane that forms two balancing chambers. Also included in the cassette is at least two reciprocating pressure displacement membrane pumps. The pumps are within the housing and they pump the fluid from a fluid inlet to a fluid outlet line and pump the second fluid from a fluid inlet to a fluid outlet.

Abstract: A pump for one or more different process fluids is provided including a pumping chamber having a process fluid inlet and outlet coupled to a process fluid valve on each pumping chamber for selectively preventing and allowing flow of process fluid through the pumping chamber. An actuation mechanism for pumping actuating fluid to actuating fluid chambers is provided that is in communication with the actuating fluid chambers to permit flow into each actuating fluid chamber of incompressible actuating fluid. A diaphragm separates each pumping chamber from an associated actuating fluid chamber for separating process fluid from actuating fluid. The actuation mechanism is removable by a quick disconnect that provides for disconnection of the activation mechanism without affecting process fluid. Operation of the actuation mechanism to displace actuating fluid causes actuating fluid to flow only into each actuating fluid chamber having an opened process fluid valve, resulting in pumping.

Abstract: A pumping device (1) by which fluids held in a reservoir tank (9) can be pumped to a spray gun (11) in a metered manner, with a piston rod (5) mounted in a housing (2) in axially movable fashion, with a reciprocating piston (25) attached thereto, with a piston (7, 8) connected to the piston rod (5) and moved between a first and a second housing sections (3, 4), first and second pressure spaces (21,21?, 22, 22?) enclosed with the two housing sections (3,4), two pressure lines (17, 17?) in each of the housing sections (3, 4) such that emerge into one of the pressure spaces (21, 21? or 22,22?), a working medium (19) pressed through pressure lines (17, 17?) alternately into a pressure space, by means of which the piston (7, 8) is driven, with a diaphragm a central area (14) connected to the piston rod (5), and its outer area (15) connected to the housing (2), and a flexible ring area (16) between the central and outer areas (14, 15), and a pumping space (20) enclosed by the diaphragm (12, 13) and the housing (2),

Abstract: The present invention includes methods and apparatuses for operating and controlling AOD pumps (10, 10?, 10?, 100, 460, 580, 740) and other pumps.

Abstract: Certain types of reciprocating positive-displacement pumps (which may be referred to hereinafter as “pods,” “pump pods,” or “pod pumps”) are used to pump fluids, such as a biological fluid (e.g., blood or peritoneal fluid), a therapeutic fluid (e.g., a medication solution), or a surfactant fluid. The pumps may be configured specifically to impart low shear forces and low turbulence on the fluid as the fluid is pumped from an inlet to an outlet. Such pumps may be particularly useful in pumping fluids that may be damaged by such shear forces (e.g., blood, and particularly heated blood, which is prone to hemolysis) or turbulence (e.g., surfactants or other fluids that may foam or otherwise be damaged or become unstable in the presence of turbulence).

Abstract: A pneumatically operated reciprocating pump comprises two opposed pumping chambers, in each one of which a respective flexible bellow slides under the control of a pneumatically operated shuttle valve capable to alternatively let a gaseous fluid in one of the two chambers for expanding the respective flexible bellow, each one of the two chambers being connected to at least one respective suction valve and to at least one respective delivery valve. Each delivery valve is provided with a compensating elastic means capable to compensate variations of rate of fluid that is pumped by the respective chamber. The pneumatically operated shuttle valve comprises a shaped spool sliding between two limit positions within a perforated cylinder, which shuttle valve is connected, for each chamber, to one or more delivery ducts and to one or more ducts for respectively letting and discharging gaseous fluid in and from the respective chamber.

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: A process fluid pump can include a pump chamber, an inlet valve, and an outlet valve. Diaphragm regions can define at least a portion of each of the pump chamber, the inlet valve, and the outlet valve. The diaphragm regions can each have an actuation region with a surface that is convexly shaped when the formed actuation region is in a natural unstressed first state, and each formed actuation region can be actuated by a motive fluid to transition to a second state in which the surface is non-convexly shaped.

Abstract: A pump cassette is disclosed. The pump cassette includes housing. The housing includes at least one fluid inlet line and at least one fluid outlet line. Also, the cassette includes at least one reciprocating pressure displacement membrane pump within the housing. The pressure pump pumps at least one fluid from the fluid inlet line to at least one of the fluid outlet line. Also, the cassette includes at least one mixing chamber within the housing. The mixing chamber is fluidly connected to the fluid outlet line.

Abstract: A valve assembly includes first and second conduits having respective first and second flanges in abutment with each other, a stopper in the second conduit, and a valve body secured between the first and second flanges. The valve body includes a body bore in communication between the first and second conduits. The body bore defines a circular opening in one end of the valve body. The valve body also includes a circumferential notch that substantially insulates the circular opening from distortion arising from securing the valve body. The stopper snuggly seats against the circular opening to prevent fluid flow from the second conduit to the first conduit, but unseats to permit fluid flow from the first conduit to the second conduit. An o-ring may surround a portion of the valve body and be energized as the valve body is secured. A lip may surround the circular opening to provide a seat for the stopper.

Abstract: A technique is provided for pumping fluids in a subterranean wellbore. A submersible pumping system can be deployed in a wellbore for moving desired fluids within the wellbore. The pumping system energizes the desired fluid movement by reciprocating a working fluid between expandable members.

Abstract: In some arrangements, a pump for moving a fluid has one or more pump chambers and one or more flow control valves with diaphragm actuation regions. Motive fluid can activate the diaphragm actuation regions, and a pattern of fluid flow can be controlled by varying the pressure levels of the motive fluid.

Abstract: The present invention provides apparatus featuring a pump system, including a modular diaphragm pump system, comprising pump modules and couplers, where the pump modules are configured to receive input feeds of fluid being drawn into the pump modules, to provide output feeds of fluid being pumped from the pump modules, and to receive gas feeds to drive the pump modules; where the couplers configured to receive a common input feed and to provide the input feeds of the fluid being drawn into the pump modules, to receive the output feeds and to provide a common output feed of the fluid being pumped from the pump modules; and to receive a common gas feed and to provide the gas feeds to drive the pump modules; and where the common gas feed causes the pump to provide a substantially constant almost pulsation free flow as one pump module becomes a master pump module and the other pump module becomes a slave pump module.

Abstract: A valve arrangement for placing a supply of motive fluid in alternating communication with first and second motive fluid chambers. The valve arrangement includes a power valve including a supply chamber, a pilot chamber, and a shiftable member separating the supply chamber from the pilot chamber. The valve arrangement also includes a pilot valve actuable between an on condition in which the pilot valve generates a pilot signal that shifts the power valve, and an off condition in which the pilot valve does not generate the pilot signal. At least a portion of the pilot valve is exposed to motive fluid, and the portion of the pilot valve exposed to motive fluid includes surface areas giving rise to a net zero actuating force arising from pressure of the motive fluid. Because there is no biasing force on the pilot valve, the pilot valve is shifted between the on and off conditions without significant resistance.

Abstract: A pump includes a housing defining an interior volume, and a diaphragm, where the diaphragm partitions the interior volume into a pumping chamber and an actuating chamber. The diaphragm is formed from a polymeric material, and the pump further includes a diaphragm support configured to limit a stroke of the diaphragm. The diaphragm support includes an array of apertures through which fluid passes to interface with the diaphragm during operation of the pump.

Abstract: A set pressure controller capable of easily controlling the pressure, releasing a load in an environment at a predetermined temperature or higher and allowing for the formation of a compact structure, a valve having the pressure controller, and a fuel cell equipped with the valve having the pressure controller are provided. The pressure controller includes a movable part to be driven by a differential pressure, wherein the pressure controller is attachable to the valve. The pressure controller attached to the valve provides the movable part with a predetermined displacement to control the set pressure.

Abstract: The devices and systems are medical fluid treatment therapies. The device and systems are configured and capable of operating based on small volumes of fluids. The devices and systems include a pump configured for small volume of a fluid. The pump may include a first conduit configured for inflow of the fluid; a second conduit configured for outflow of the fluid; a fluid chamber configured to move the fluid through the pump; a diaphragm configured to force the fluid through the fluid chamber by indirectly exerting force on the fluid chamber; and a connector configured to removably attach the pump to a motor.

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 double-diaphragm pump comprising a pair of axially spaced apart pumping chambers, each chamber having a pumping diaphragm which divides each chamber into an inner and outer compartment, the inner ends of both pumping chambers being closed by a central element, means for supplying fluid to the outer compartments to cause the diaphragms to oscillate and vary the capacities of the inner compartments and each of the inner compartments having an inlet and an outlet port leading to unidirectional valves to allow fluid to be drawn into one of the compartments when the appropriate diaphragm moves outwardly and expelled from that compartment when the diaphragm moves inwardly, and in which the unidirectional valves are located in inlet and outlet manifolds in the central element and are accessed and fitted through the inlet and outlet ports in the inner compartments.

Abstract: A hydraulically driven multicylinder diaphragm pumping machine has pump cylinders, each having at one end an inlet/outlet for fluid material to be pumped, and at the other end an inlet and outlet for hydraulic oil. A separator inside the pump cylinder is connected to the fluid-material end of the cylinder by a flexible diaphragm and to the fluid material end by another diaphragm, leaving an outer annular space that contains hydraulic fluid. The total volume of pumping hydraulic oil in the cylinders is maintained constant and by a device that compensates for thermal expansion and controls the necessary return flow of hydraulic oil for driving the pump. The separators move with an intake stroke at constant speed for all cylinders, and with pumping strokes function of the hydraulic oil delivery, so a lesser number of separators effect an intake stroke while a greater number of separators effect a discharge stroke.

Abstract: A diaphragm assembly designed for employment in a fluid driven diaphragm pump includes a piston having an inflexible core. This core includes a hub with a plate extending radially from about the periphery of the hub and a center attachment concentrically arranged in the hub and accessible from a first end of the hub. The plate defines the inflexibility of the piston. The piston further includes a unitary diaphragm body molded with the inflexible core in situ. A peripheral convolute portion outwardly of the piston is integrally molded with the unitary diaphragm body. The unitary diaphragm body has a plurality of connective tendons extending through the plate. A thermoplastic coating extends about the inflexible core between the core and the molded unitary diaphragm body. The unitary diaphragm body is of thermoplastic elastomer having at least a thermally miscible surface with the thermoplastic coating.

Abstract: A fluid transporting device is provided with a pump chamber that has a pump function for sucking and discharging a fluid, and is filled therein with the fluid, a casing unit which forms one portion of a wall surface of the pump chamber, a diaphragm which is formed by a conductive polymer film that is subjected to electrochemomechanical expansion and contraction, and forms one portion of the wall surface of the pump chamber, an electrolyte chamber that contains an electrolyte therein, with one portion of the electrolyte being made in contact with the diaphragm, a power supply that applies a voltage to the diaphragm, and a pressure maintaining unit that maintains a pressure to be applied to the diaphragm.

Abstract: A diaphragm pump for achieving reduced pressure ripple of an exhausted gas is provided. The diaphragm pump is a pump for transporting a gas in accordance with change in volume of a pump chamber, and the diaphragm pump includes an exhaust valve permitting flow of the gas that flows out of the pump chamber and prohibiting a flow thereof in a reverse direction, an air chamber in which the gas that has flowed out of the pump chamber through the exhaust valve flows, an exhaust port through which the gas is exhausted to the outside of the diaphragm pump, and a through hole portion for restricting a flow rate of the gas that flows from the air chamber to the exhaust port.

Abstract: A hydraulically-controlled diaphragm pump has a pump chamber (3) formed between a pump head and a pump body (9) with a movable wall formed by a diaphragm that is elastically deformable from its rest shape that corresponds to its state at the end of the suction stroke of the pump. A constant volume intermediate hydraulic chamber (8) is formed in the pump body (9) and includes a piston (10) driven with reciprocating motion inside said intermediate chamber (8). A leak compensation volume for compensating leaks from the intermediate chamber (8) is connected thereto by a top-up channel (28, 21, 18) via a free check valve (13) that is not rated and that passes fluid towards the working chamber (8), wherein the check valve (13) and at least a portion (34) of the compensation volume are housed in a body (23, 31) fitted to the pump body (9) at the high point of the intermediate hydraulic chamber (8) in the working position of the pump.

Abstract: A dialysis system includes a dialysis instrument; a disposable cassette, the cassette including a rigid portion defining at least one pumping chamber, a pouch fitted over the rigid portion, the pouch including at least one flexible sheet sealed so as to provide a sealed environment inside the pouch; and wherein the instrument is configured to press the at least one flexible sheet against the pumping chamber to seal the pumping chamber for operation.

Abstract: A pump for use in handling one or more different process fluids includes a plurality of pumping chambers having a process fluid inlet and a process fluid outlet, process fluid outlet coupled to a process fluid valve on each pumping chamber for selectively preventing and allowing the flow of process fluid through the pumping chamber, an actuation mechanism for pumping actuating fluid to a plurality of actuating fluid chambers in fluid communication with the actuating fluid chambers to permit flow into each actuating fluid chamber of actuating fluid, and at least one diaphragm separating each pumping chamber from an associated actuating fluid chamber, for separating process fluid from actuating fluid. Operation of the actuation mechanism displaces actuating fluid and causes actuating fluid to flow only into each of the actuating fluid chambers having an opened process fluid valve, resulting in pumping.

Abstract: A chemical liquid supplying apparatus which can discharge chemical liquid with high accuracy is provided. The apparatus is used to discharge the chemical liquid in a chemical liquid tank from an application nozzle. The apparatus has a combined member formed integrally with a pump case and a cylinder, and a flexible tube serving as a pump member is provided in the pump case, wherein its inside is a pump chamber and its outside is a pump-side driving chamber. A piston is assembled to the cylinder and when the piston is reciprocated by a motor, the pump chamber is expanded and contracted. A gap between the piston and the cylinder is covered with a diaphragm, and an interior of the diaphragm is a seal space. Therefore, an incompressible medium having leaked from the gap between the piston and the cylinder enters into the seal space and does not leak to the outside.

Abstract: A high pressure double membrane pump has a central housing (3), two cylindrical pump chambers (7,8), a coupling rod (4) which moves back and forth when the pump is in operation and which has a pump piston (9), two membranes which divide each of the pump chambers (7,8) into a product chamber (11,12) and a compressed air chamber (1,2) with changing volumes of which the membranes have a peripherally mounted membrane body (15). In the central area of the membrane body (15) a rigid implant body (17) is embedded which is equipped with a dog (18) which is connected to one end of the coupling rod (4), and a pneumatic control unit for the alternating impinging of compressed air upon the compressed air chambers. In the area of the compressed air chambers (1,2) a rigid supporting ring (20) is pushed onto the dog (18) between the end of the coupling rod (4) and the inner side of the membrane (5).

Abstract: A technique is provided for pumping fluids in a subterranean wellbore. A submersible pumping system can be deployed in a wellbore for moving desired fluids within the wellbore. The pumping system energizes the desired fluid movement by reciprocating a working fluid between expandable members.

Abstract: The present invention relates to the oil pump, and can be used with a standard pump jack. The pump can be used to withdraw any type of fluid, including water for example. Certain aspects of the invention relate to a method and apparatus for efficiently converting the up and down motion of the pump jack into a reliable vacuum source which can reliably pull unrefined/crude oil from the first depth to the second depth.

Abstract: A chemical liquid supply system that prevents the generation of heat during operation in a pump and allows downsizing the discharge pump for instilling a chemical liquid from a tip nozzle. Compressed air is supplied to an upper space of a resist bottle and the chemical liquid is conferred positive pressure and sent out to a pump chamber of a discharge pump, thereby the pump chamber is filled with a resist liquid. This eliminates the need of a conventional construction where a spring or others are used to drive a flexible membrane of the discharge pump to the operation chamber side to take in the resist liquid. As a result, no electric motor is used, so there is obviously no risk of heat damage to a semiconductor wafer and the discharge pump itself can be further downsized.

Abstract: An air logic controller for increasing the efficiency of an air operated double diaphragm pump. The air logic controller may increase the efficiency of the pump by controlling the supply of compressed fluid to the pump. In one embodiment, the air logic controller may control the supply of compressed fluid to the pump by replacing the continuous, large volume supply of compressed fluid supplied to conventional air operated pumps during a single pumping stroke with a varied supply of compressed fluid. The varied supply of compressed fluid may comprise a supply of compressed fluid that alternates between a large volume supply and a small volume supply of compressed fluid. The air logic controller may vary the supply of compressed fluid to the pump based at least partially on the position of a main air valve spool and the setting on an adjustable pneumatic time delay relay.

Abstract: A pump device includes a pulsator as a drive element for a main pump head which is situated in a delivery line and the working chamber of which is provided with a suction-side non-return valve and a pressure-side non-return valve. The working chamber of the pulsator is connected via an oscillation line, which is filled with delivery medium, to the working chamber of the main pump head in such a way that the pulsator sucks delivery medium out of the delivery line and into the working chamber of the main pump head, or presses delivery medium out of the working chamber, in an oscillating fashion. A ventilation valve is provided for ventilating the working chamber of the pulsator, and the ventilation line is a time-controlled valve and/or a pressure-controlled double-seat valve. A device may be provided for introducing a liquid into the working chamber of the pulsator and/or the oscillation line.

Abstract: An opening 22d of a supply/withdrawal passage 22b is positioned at the center part of the internal wall surface 22c of the operating chamber 26 (concave area 22a), and a pin 24 that protrudes toward the diaphragm 23 is provided in a position that is offset from the center of the wall surface 22c. When the diaphragm 23 is deformed toward the operating chamber 26 by the suction of an operation air into the operating chamber 26 during drawing in the chemical liquid, a part of the diaphragm 23 opposing to the pin 24 rides on the pin 24 and this part becomes a slightly convex shape toward the pump chamber 25. When the operation air is supplied from the opening 22d into the operating chamber 26 during the discharge of the chemical liquid, the deformation begins first from the part of the diaphragm 23 riding on the pin 24.

Abstract: A laminate membrane having an elastomer body and a contact layer applied to the elastomer body. The contact layer is made of polytetrafluoroethylene (PTFE). A barrier layer configured as a permeation barrier is additionally provided, which is disposed between the contact layer and the elastomer body, or applied to the side of the contact layer that faces away from the elastomer body.

Abstract: A reagent head has a housing, an inlet and an outlet. Check valves and other details are not shown for clarity. The reagent head may have a dish where a diaphragm may seat when in a fully forward position. The reagent head may be constructed primarily from a high-strength material, e.g. ductile iron, in a substrate layer. The reagent head may also comprise a polymer layer. The polymer-metal interface may incorporate key grooves to provide an increased surface area for the polymer-metal bond. The key grooves may be any shape which increases the bonding surface area. Certain key groove cross-sectional shapes, such as dovetails, will create an interlocking interface that may provide increase resistance to separation of the polymer layer from the substrate layer.

Abstract: A check valve structure has a first space and a second space. The check valve structure is configured to allow a flow of a fluid from the first space to the second space and to inhibit flow of the fluid from the second space to the first space. The check valve structure has a partition wall arranged between the first space and the second space and provided with a communication hole providing communication between the first space and the second space, an elastic film body for covering the side of the second space of the communication hole so as to prevent a reverse flow of the fluid, an elastic member having a wall portion surrounding the communication hole for holding the elastic film body, and a nipping member for nipping the elastic member with the partition wall.

Abstract: A fluid pump for moving a fluid from a first fluid source of the fluid in a low pressure state to a second fluid source of the fluid in a high pressure state, includes a chamber; a partitioning member displaceable in the chamber and dividing the chamber into first and second sub-chambers of varying volumes; the first sub-chamber having an opening controllably communicable with either the second fluid source or a third fluid source; the second sub-chamber having inlet and outlet openings controllably communicable with the first and second fluid sources, respectively; and a cooling element for cooling a fluid in the first sub-chamber.