Abstract: A hydrostatic energy generator includes at least a first chamber and a second chamber, wherein the first chamber and the second chamber are at least partially filled with a fluid in order to exploit hydrostatic energy, such as for instance static or hydrostatic pressure or head, to generate and deliver energy, such as hydraulic energy, electrical energy, or mechanical energy. A first piston is movably arranged within the first chamber and a second piston is movably arranged within the second chamber, wherein the first piston is mechanically or hydraulically connected to the second piston. The first chamber includes a first passageway for inlet and/or discharge of the fluid and a second passageway for inlet and/or discharge of the fluid. The second chamber includes a third passageway for inlet and/or discharge of the fluid and a fourth passageway for inlet and/or discharge of the fluid.

Abstract: A hand-operated piston pump includes a drive shaft and a rotor mounted in a housing case, the rotor having axial compression chambers, a piston biased by an elastic member sliding in each compression chamber and having a projecting end that engages a cam track; a fluid reservoir in the housing case; a valve plate downstream of the rotor having conduits for a pressurized fluid that communicate with conduits in walls of the compression chambers, the valve plate being non-rotatably mounted below the housing case and communicating with conduits that carry the pressurized fluid to and from a consuming unit through an interposed check valve inserted in a corresponding valve body, the valve body having an upper flange with fluid supply and return channels communicating with the fluid conduits of the valve plate. The valve plate floats relative to the upper flange and is separated therefrom by a separating member.

Abstract: A hydraulic power module is provided with a plurality of hydraulic actuators. A piston of each of the hydraulic actuators is coupled with a drive plate and a screw is rotatably coupled with the drive plate. Rotation of the screw longitudinally displaces the drive plate to simultaneously actuate each of the hydraulic actuators. A second hydraulic power module may be coupled with the hydraulic power module, such that rotation of the screw also drives the screw of the second hydraulic power module.

Abstract: A wellbore pump includes a pump housing suspendible in a wellbore at ends of at least one of a power fluid line and a fluid discharge line. The pump housing includes a fluid inlet proximate a bottom end thereof and wherein the fluid discharge line is coupled proximate a top end thereof. The pump include valves for directing flow of wellbore fluid out of the housing when power fluid displaces fluid in the housing, the valves for directing flow of wellbore fluid into the housing when power fluid pressure is relieved.

Abstract: A compressor or vacuum pump fluid intake manifold has fluid intake and a pair of ports provided by male and female fittings that are slidably engaged to one another. The male fitting has a portion which forms a hollow plug which fits within a respective fluid intake of the compressor housing. The plug portion, or plug, is integrally molded with a longitudinal section of the male fitting member. In similar fashion, the female fitting includes a plug portion which interfaces with a fluid intake in the compressor housing. The plug portion is integrally molded with a longitudinal portion of the female fitting. In one embodiment, each of the plugs includes three extending flanges forming an integral portion of the plug. Two of the three flanges provide a contact pressure seal with portions of the compressor housing that define the fluid intakes which receive the plugs. The other flange serves to prevent the plugs from slipping out of the fluid intakes during normal use of the fluid intake manifold.

Abstract: This refrigeration compressor includes a plurality of compression units, each compression unit having a cylinder head including a refrigerant suction chamber and a refrigerant discharge chamber, a refrigerant distribution device having a distribution pipe and bypass pipes putting the distribution and the suction chambers of the compression units in communication, and a refrigerant discharge device having a discharge pipe and bypass pipes putting the discharge pipe and the discharge chambers of the compression units in communication. The compressor also includes a pressure equilibration pipe arranged to put the suction chambers of at least two compression units and/or the discharge chambers of at least two compression units in communication.

Abstract: In one embodiment, a volumetric pump in a medical fluid delivery system comprises at least one piston in a hollow cylinder, the pump having at least one inlet port through which a medical fluid can be sucked into a pump chamber during an instroke of said piston, and at least one outlet port through which the medical fluid can be expelled during an outstroke of the piston. The piston or the hollow cylinder can be actuated directly or indirectly by a rotor. This rotor transmits on the one hand a bi-directional linear movement to the piston or to the cylinder and on the other hand, a bi-directional angular movement either to the piston or to another ratable element in order to open and close alternately the inlet and outlet ports.

Abstract: A valveless MEMS micropump capable of improved efficiency and performance is disclosed. The micropump includes two adjoining chambers separated by a piezoelectric actuated pump membrane. The micropump moves fluid through the chambers through diffuser elements characterized by differential directional resistance to fluid flow by piezoelectric actuation of the pump membrane.

Abstract: There are a number of applications today where the pumping of abrasive slurries is necessary. The pumping mechanisms, though, can be complex, employing multiple transfer cylinders and movable pipes. These designs have their problems, specifically wear between poorly sealing surfaces. To reduce this problem, seals are provided that have multiple wear surfaces which include harder tiles secured over a softer core to benefit from the relative hardness or flexibility of each of the respective materials.

Abstract: The apparatus of the present invention includes a hydrostatic retarder pump and motor. The apparatus includes a housing rotatably supporting a shaft. The shaft includes a first eccentric portion and a second eccentric portion. A plurality of pistons are disposed within the housing and are engageable with the first eccentric portion. A plurality of valves are also disposed within the housing and are engageable with the second eccentric portion. The plurality of valves are configured to selectively connect the plurality of pistons with a low pressure accumulator or a high pressure accumulator. The rotation of the shaft may be implemented to drive the plurality of pistons and thereby transfer hydraulic fluid from the low pressure accumulator to the high pressure accumulator such that resistance is applied to the shaft and vehicle output is retarded. Alternatively, hydraulic fluid from the high pressure accumulator may be implemented to drive the plurality of pistons and thereby power the vehicle.

Abstract: There are a number of applications today where the pumping of abrasive slurries is necessary. The pumping mechanisms, though, can be complex, employing multiple transfer cylinders and movable pipes. These designs have their problems, specifically wear between poorly sealing surfaces. To reduce this problem, seals are provided that have multiple wear surfaces which include harder tiles secured over a softer core to benefit from the relative hardness or flexibility of each of the respective materials.

Abstract: A pump has a housing defining a first pumping chamber and a second pumping chamber. The pump also has a first plunger and a second plunger. The pump additionally has at least one driver operatively engaged with at least one of the first and second plungers to move the at least one of the first and second plungers between first and second end positions. The pump further has a common spill passageway fluidly connectable to the first and second pumping chambers and a selector valve disposed between the common spill passageway and the first and second pumping chambers. The selector valve has a body and a ball valve member operably disposed within the body. The ball valve member is movable between a first and a second ball valve member position to selectively fluidly connect the first and second pumping chambers to the common spill passageway.

Abstract: A hydraulic automatically-pressurizing pump comprises an intermediate fastening connector, a reversing valve, a mechanically-controlled automatic direction-reversing device, a power cylinder, a pressurizing cylinder and an ultrahigh-pressure connecting tube which are disposed in series in a case and assembled from the upper end to the lower end along a central axes of the case. The fastening connector is connected with the case and further connected through pressure with the reversing valve. The power cylinder is a multi-stage power cylinder. The pressurizing cylinder communicates with a two-channel drill bit through the ultrahigh-pressure connecting tube, and an ultrahigh-pressure channel is provided on the wall of the pressurizing cylinder. The core of the reversing valve is connected with the mechanically-controlled automatic direction-reversing device.

Abstract: A diaphragm is provided in a pump case so as to define a pump chamber communicated with an external member having an air chamber. A motor actuates the diaphragm to introduce air into the pump chamber and to supply the introduced air to the air chamber. An exhaust valve exhausts air in the pump chamber to lower a pressure in the air chamber. The exhaust valve is provided with a valve body and an actuator which is driven by the motor to actuate the valve body so as to open or close an exhaust port communicated with the pump chamber.

Abstract: A metering pump that is capable of delivering a constant, rate of fluid over a wide range of viscosities at infinitely variable delivery rates. Two identical pumping chambers are provided with one operating in the suction mode, and the other in the discharge mode with each cylinder switching modes at each pumping cycle, thereby providing continuous delivery of fluid in and out of the pump. The displacement of the chamber is large in order to facilitate operation at a very slow cycle speed of only one to four reciprocations per minute. The fluid valves are mechanically operated providing for positive sealing thus enabling the pump to operate at very slow speeds without leakage.

Abstract: A hand-operated inflator with dual cylinder is provided. Once the cylinders are pulled out on two sides of the central block to form a line axially, and a clamp plate at mid point in between the two cylinders is turned to the transversal position to lock the cylinders in place, the inflator is set for refilling operation. The two cylinders can be folded back when the clamp plate is released, making it easy for carrying and storage with the length reduced by half. The inflator is able to inflate an object with faster rate as compared with the conventional inflators with only one air cylinder. Moreover, the central block can be attached with a pressure meter. If the measured air pressure inside the object gets excessively high, air can be safely released through an over pressure valve.

Abstract: A method for controlling a thick matter pump comprising two delivery cylinders (10) emerging, via two openings (12), into a material reservoir (14), associated with two delivery pistons (26), symmetrically synchronized relative to said cylinders, and a branch pipe 18 arranged inside the material reservoir (14), capable of being connected, on the input side, alternatively to one of the openings of the delivery cylinders with exposing of the other opening, the output side connected to a conveyance conduit (20). When the pumping is interrupted, thick matter, liquid concrete for example, is sucked up, via the delivery cylinder temporarily communicating with the reservoir, and is delivered, via the other cylinder (10), connected to the branch pipe (18), so as to form a column of thick matter through the delivery pipe (20), towards its output.

Abstract: A pump which has a diaphragm main body integrally connected at a planar portion to a diaphragm portion forming a pump chamber and performs a pumping action by reciprocating a driving portion disposed integrally with the diaphragm portion; the pump being configured compact by disposing a suction valve at the planar portion of the diaphragm main body and further using a planar discharge valve.

Abstract: A dual-direction pump includes two cylinders arranged on opposite sides of a head portion and an inlet return-flow prevention device and a leakproof device mounted between the cylinder and the head portion for avoiding leakage at the juncture between the cylinder and the head portion or leakage induced by reverse flow in one of the cylinders in the case of a single-sided pumping operation in the other cylinder. The head portion has an outlet port to which an outlet return-flow prevention device is mounted. A knob is rotatably mounted to the outlet pot and a nut is fixed to the knob for selectively engaging an inflation valve to avert detachment. The outlet return-flow prevention device prevents reverse or return flow induced in the outlet port in order to reduce resistance caused thereby and enhances pumping efficiency.

Abstract: A vibratory pump includes an oscillator that is connected to a plunger mounted within a housing submerged beneath the surface of a fluid to be displaced. The oscillations of the plunger selectively communicate an outlet for the pump with inlet openings on the housing. The selective communication creates a slight vacuum in the pump that enables the fluid to be moved by the pump without generating any significant back pressure in the outlet fluid flow from the pump. The pump can also be configured to operate in a dual stroke mode where an outward flow of fluid from the pump is generated during both the downward and return strokes of the pump.

Abstract: A two-cylinder thick-matter pump for continuous delivery of thick matter is characterized in that a reversing valve (5) has a diverter housing (8, 8′) with at least four openings (a-b), the diverter (6, 6′) disposed in the diverter housing (8, 8′) is swiveled with its outlet opening in front of the cylinder openings and has an inlet opening (RE) which is firmly connected with the suction pipe (3), the cavity (H) in the diverter housing (8, 8′) being constantly under delivery pressure, and at least one shut-off element (10) being provided for closing the suction pipe (3) and/or the first and/or second openings (a , b) of the diverter housing (8, 8′).

Abstract: An energy recovery device includes at least one cylinder, a piston slidable in the cylinder, a first valve for selectively connecting one end of the cylinder to waste liquid at a first relatively high pressure and to drain and a second valve for allowing feed liquid to enter the other end of the cylinder at a second lower pressure via a feed liquid entry port and to be discharged via a feed liquid discharge port from the other end of the cylinder in response to movement of the piston caused by waste liquid entering the one end of the cylinder. A rod which extends from the other end of the cylinder and into but not through the piston, ensures that the area of the piston acting on the feed liquid is less than the area of the piston acted upon by the waste liquid so that the piston acts as a pressure intensifier to discharge feed liquid through the feed liquid discharge port at a higher pressure than the pressure of waste liquid entering the one end of the cylinder.

Abstract: The radial piston pump has a number of cylinder bores in a pump housing to accommodate pistons which slide into them; the cylinder bores are plugged by pressed-in stoppers (3) in which pressure channels are incorporated, all stoppers being sealed by a flat spring (6) which serves as return valve. To enlarge the outflow cross section through the pressure channels, each stopper 3 has at least one side discharge channel (8, 9).

Abstract: A positive displacement pump for gases includes a pair of pistons operating out of phase. Each of the pistons is associated with a plurality of rotary inlet valves disposed along the sidewalls of the piston cylinders. A rotary outlet valve is also associated with each piston and includes a rotating valve body disposed transversely across the cylinder head and which rotates in synchronism to open a through, radial port in the member in timed relationship to the piston travel. The positive displacement pump finds particular application heating, cooling and ventilating applications.

Abstract: A pump includes a main body, an inner tube mounted in the main body, and a hollow piston slidably mounted in the main body and partially receiving the inner tube. A piston is mounted in the main body and slidable along the inner tube. Two O-rings are mounted in two annular grooves in an outer periphery of the piston. A plug is secured to a lower end of the inner tube and includes two O-rings in two annular groove in an outer periphery thereof. A handle is attached to the piston rod for manual operation. The annular grooves of the piston and the plug include notches arranged in a manner to allow air to be outputted during each stroke of the piston rod.

Abstract: A pneumatic cylinder for actuating fume extraction valves in fume and heat extraction plants has a piston (2) that may be actuated from both sides with at least one working surface and that can be made to slide by pressurised air in a cylinder (1) with at least one working chamber (4), as well as an energy accumulator with regulating means. The regulating means can be controlled by control means to open or keep open the fume extraction valves. In order to obtain a compact pneumatic cylinder for a fume and heat extraction plant which is easy to install, a storage chamber in which air or pressurised air is stored as compressible pressure medium is provided as energy accumulator. The storage chamber is in communication with a compression surface (7) of the piston (2), at its side opposite to the working surface (7), so that pressure medium may flow between the storage chamber and the compression surface (7).

Abstract: A bicycle tire pump includes a cylinder having two passages defined therethrough which are separated by a board, two openings respectively defined in a top of the cylinder and communicating with the two passages into which two pistons are respectively and movably received. A head is mounted to the top of the cylinder and has two ways defined therein which respectively communicate with the two passages in the cylinder and an outlet of the head. A bolt extends through one of the two passages and is threadedly connected to the head. The bolt has a longitudinal passage defined therethrough which communicates with one of the two ways.

Abstract: The invention relates to a device 1 for creating pressure, especially for use as an air pump or a standing compressor, with a stepped housing which is provided with at least one valve connection and whereby a first 8 and a second pressure chamber 61, 62 form a part of the housing's interior; the volume of the former can be altered by a piston and a seal 60 which is effective in only one direction connects the pressure chambers 8, 61, 62. It is proposed that the disadvantages of the known devices, a considerable expenditure of energy being necessary to obtain the final pressure, can be eliminated in that the second pressure chamber comprises two individual pressure chamber sections 61, 62 which are coaxial to the first pressure chamber 8 and which are in a working connection.

Abstract: A hand pump includes a piston slidably engaged in a housing for separating the housing into two chambers. A tube is secured on top of the housing. The piston includes two annular grooves for receiving two sealing rings. A piston rod has one end secured to the piston and has the other end extended outward of the housing. The piston may pump the air in upper chamber into the tube when the piston moves upward, and the air in the lower chamber may be pumped into the tube when the piston moves downward. The tube includes two mouths for engaging with different tire valves.

Abstract: A variable displacement high pressure pump for pumping fluid at a high pressure to an accumulation chamber is disclosed including a low pressure supply pump for supplying fluid at a low pressure, a first high pressure pumping unit for receiving the low pressure fluid through an inlet and selectively delivering the supply fluid to the accumulation chamber at a high pressure greater than the low pressure, a second high pressure pumping unit for receiving the low pressure fluid through an inlet and selectively delivering the supplied fluid to the accumulation chamber at a pressure greater than the low pressure, a common fluid passage in fluid communication with each of the first and second high pressure pumping units for permitting the flow of fluid from one of the first and second high pressure pumping units to the other of the first and second high pressure pumping units and a pressure balanced valve positioned in the common fluid passage for selectively blocking the flow of fluid between the first and second

Abstract: A radial piston pump has a pump body with two pump chambers lying in a straight line. In the pump chambers pistons reciprocate along this same straight line. The pump pistons are coupled to an actuator which is rotatable about an axis which bisects the straight line, and reciprocates the pistons in opposite directions. Each pump chamber is connected to an intake fluid duct and a discharge fluid duct, and the intake ducts are connected to a common main intake duct and the discharge fluid ducts to a common main discharge duct. An actuator controls operating components which co-operate with valve arrangements for the opening and closing of the fluid ducts.

Abstract: A double acting concrete pump includes a pair of pump cylinders with a piston slidable back and forth in each cylinder, the pistons being driven in opposite directions, a connecting manifold connecting each of the cylinder outlets to a source of cement via separate pumping chambers, and a separate, removable discharge manifold for connecting the pumping chamber outlets to a delivery outlet. The discharge manifold has a discharge chamber with a pair of inlets connected to the respective pumping chamber outlets, and a single discharge outlet, with an outlet control valve in the discharge chamber for alternately isolating the flow from each of the pumping chambers to the discharge outlet in response to the pumping action.

Abstract: A pump for applying pre-mixed cement, and similar mud-like flowable materials, employs power driven oppositely reciprocating pistons sliding in a pair of cylinders for pumping action. A control manifold, having a single cement discharge outlet, interconnects combined suction and discharge outlets of each pump cylinder with a cement supply hopper manifold inlet. Two manifold pump response chambers, and a single discharge chamber in flow communication with one another within the manifold, together with associated valving within each chamber, provides for unidirectional flow of cement under pressure from the manifold discharge outlet solely in response to the movement of the pistons within the pump cylinders. The pump response chamber valves have adjustable valve openings so that the pump may be employed with flowable materials of varying viscosity.

Abstract: A pump (10) is disclosed for use in pumping a fluid (14) from a borehole (12) to the surface. The pump includes a first and second pumping string (20, 22) extending into the borehole and a return string (26) extending from the borehole. First and second pistons (82, 94) are slidably mounted at the ends of the first and second puming strings within the borehole, respectively for reciprocation between extended and retracted positions. First and second pumping cylinders (56, 64) are secured in fixed relation to the first and second pumping strings (20, 22) so that the first and second pistons (82, 94) are slidable therein. The pistons and pumping cylinders define first and second pumping chambers (92, 104). Each of the first and second pistons includes a gear rack (88, 100) having teeth meshing with the teeth on a stroke return gear (106).

Abstract: Automatic terminal machines for banking transactions utilize a document dispenser for delivering bank notes to a customer. The document dispenser moves the bank notes from a storage bin by means of a picker mechanism that moves along a path profile established by the configuration of a pair of cam tracks and associated cam followers. The picker mechanism includes vacuum cups for lifting the first document from a stack in the storage bin for delivery into a document transport. Connected to the vacuum cups is a vacuum/pressure supply that includes a multiple chamber cylinder that provides both vacuum and pressure synchronized with operation of the picker mechanism. The piston is pivotally mounted to enable swivel action when driving the interconnected pistons in respective chambers. When provided, the document dispenser includes a cassette having a loading door and an unloading door, each separately equipped with a locking device.

Abstract: A bicycle tire pump includes a cylinder having two passages defined therethrough which are separated by a board, two openings respectively defined in a top of the cylinder and communicating with the two passages into which two pistons are respectively and movably received. A head is mounted to the top of the cylinder and has two ways defined therein which respectively communicate with the two passages in the cylinder and an outlet of the head. A bolt extends through one of the two passages and is threadedly connected to the head. The bolt has a longitudinal passage defined therethrough which communicates with one of the two ways.