Abstract: Disclosed are an isentropic booster and a method thereof. The booster comprises a main body pump having a chamber provided with a fixed division plate, a left piston, a right piston and a connecting rod separating the chamber into a plurality of independent booster chambers. The connecting rod passes through the division plate and connects at its two opposite ends with the left piston and the right piston. The volume of the booster chambers is changed with the movement of the left piston and the right piston. A part of the plurality of the booster chambers connect between high-pressure gas source and a medium-pressure gas pipeline network, and the rest of the plurality of the booster chambers connect between low-pressure gas source and the medium-pressure gas pipeline network. The isentropic booster of present invention improves efficiency of using high-pressure gas.

Abstract: A hydraulic pump having a plurality of pistons sliding in bores formed in a barrel mounted in rotation in a casing of the pump, the barrel bearing against a distribution port plate borne by a cylinder head. Two drainage channels place an inner space of the casing in respective communication with two suction/delivery orifices of the cylinder head. Each drainage channel is provided with a valve able to close the drainage channel in response to an overpressure in the suction/delivery orifice such that, according to the direction of rotation of the pump, the inner space of the casing is in communication through one of the drainage channels with the suction line; whereas the communication through the other drainage channel between the delivery side and the inner space of the casing is closed.

Abstract: Disclosed are systems and methods utilizing multiple parallel pumps to deliver a mixture of the proppant and clean fluid via a manifold trailer. One method of providing a step-change in proppant concentration includes selecting a first flow rate for a first pump connected between a first input node and first output node, calculating a first transit time for a flow of a fluid at the first flow rate through a first flow path extending from the first inlet node, through the first pump, and to the first outlet node, and calculating a second flow rate for a second pump connected between the first input node and the first output node such that a second transit time for a flow of the fluid through a second flow path extending from the first inlet node, through the second pump, and to the first outlet node is equal to the first transit time.

Abstract: Disclosed are apparatus adapted to dispense and/or aspirate liquids, such as in a clinical analyzer. In one aspect, a multi-chamber pump apparatus is disclosed that has a pump body containing first and second chambers, a piston having a first piston portion of a first pump area A1 received in the first chamber, and a second piston portion of a second pumping area A2 received in the second chamber, and an actuator coupled to the piston. The first and second chambers can be selectively accessed to improve metering accuracy at dissimilar flow volumes from the chambers. Methods and systems including the multi-chamber pump apparatus are provided, as are other aspects.

Abstract: A heat pump system including a heat engine having a valve assembly positioned to divide the heat engine chamber into a first chamber and a second chamber. A piston is positioned within the heat engine and includes a first piston head in the first chamber, a second piston head in the second chamber, and a connecting rod connecting the first and second piston heads and extending through a bore in the valve assembly. The valve assembly includes a one-way inlet valve and a one-way outlet valve in fluid communication with each of the first and second heat engine chambers. The valve assembly is also in fluid communication with a condenser and evaporator of the heat pump system. The system may also include improved one-way valves, a condensate pump, and a novel shifting valve.

Abstract: A double-diaphragm pump includes a pair of axially spaced apart pumping chambers, each chamber having a pumping diaphragm which divides each chamber into an inner and outer compartment. Inner ends of both pumping chambers are closed by a central element, and fluid is supplied to the outer compartments to cause the diaphragms to oscillate and vary the capacities of the inner compartments. I 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. 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: 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 volumetric pump (1) comprising a piston (2) and a cylindrical chamber (3), contains an inlet port (10) and an outlet port (11). The piston (2) is actuated by a rotor (5) bearing an eccentric shaft (6). The shaft (6), being connected to the piston (2), causes the piston to slide back and forth inside the cylinder chamber (3) while having a bidirectional angular movement. The instroke of the piston (2) sucks a fluid (15) from the inlet port (10) through a first channel (12) into the pump chamber (3), the fluid being propelled through a second channel (13) to the outlet port (11) during the outstroke of the piston (2). The inlet (10) and outlet port (11) are opened and closed alternatively by the bidirectional angular movement of the piston (2) which acts as a valve for the inlet and outlet ports (10, 11).

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: The present invention is to provide a dual reciprocating bellows pump which can facilitate size reduction design of the whole pump, permit pump manufacture at low cost, and permit reducing the dead spaces in pumping chambers to provide improved self-suction performance. Valve cases of suction side and discharge side valve units are disposed one below the other along a longitudinal axis passing through the center of the cross-section of the bellows such that they project into the associated pumping chambers, and a pair of interlock shafts are disposed at positions spaced apart to the left and right from the center in the transversal direction. With this construction, it is possible to reduce the dead spaces in the pumping chambers, reduce the longitudinal and transversal dimensions of the pump and facilitate size reduction design of the pump.

Abstract: A double-acting pump having two cavities, each of which is divided into an operating chamber and a working chamber by means of a respective movable partition wall. Each of the operating and working chambers is provided with a valve-controlled inlet and outlet for a gaseous driving medium and a pump-transported liquid working medium. A movement transmission device extends between the movable partition walls and transmits movement of one partition wall to the other and vice versa. This movement transmission device includes a spring element for compression and expansion in the movement transmission direction such that a distance between the partition walls is variable as one partition wall can move independently of the other wall responsive to relative gas pressure in the operating chambers.

Abstract: A dual inline double acting plunger arrangement is particularly adapted for pumping thick slurries and includes a hollow cylinder divided into two closed chambers by a partition. A first plunger is disposed in a first chamber and a second plunger is disposed in a second chamber with the two plungers coupled together by appropriate linkage outside of the cylinder. A drive mechanism connected to the coupling linkage simultaneously displaces the two plungers in a reciprocating manner within the two chambers. Inlet and outlet ports in each of the chambers coupled to inlet and outlet valve assemblies allow for the pumping of a slurry from the chambers by the two plungers in an alternating manner. Each valve assembly includes a housing having a pair of ball valves which are both employed either as inlet valves or outlet valves, as the valve assembly may be configured to perform both functions.

Abstract: A metering apparatus, which may be single or double acting, includes a valve device including a closure member, an inlet port, an outlet port and one or two other ports communicating with a metering chamber of the single-acting apparatus or respective metering chambers of the double-acting apparatus. The closure member prevents communication between the inlet port and the outlet port during normal working, but, to allow flushing of the apparatus by cleaning fluid, the closure member can be displaced to an abnormal position in which the inlet port communicates with the outlet port by way of the other port(s).

Abstract: A radial piston pump has diametrically opposed pistons coupled to each other by a coupling ring mounted in circumferential grooves located adjacent the facing ends of the piston. The coupling ring is formed with axially projecting bifurcated arms received in the piston grooves. The arms are of a reversely bent undulating shape which is compressed between opposed walls of the groove to firmly couple the ring to each piston. The ring is thus supported entirely by the pistons. A central opening through the ring is expanded in the direction normal to the piston axis to provide clearance for side to side motion of an eccentric which drives the pistons in reciprocation.

Abstract: A radial piston pump with at least one pair of pistons which alternately perform working strokes and are arranged in a stationary cylinder block with working chambers comprising inlet valves and outlet valves. An eccentric shaft controls the radial movement of the pistons and an annular device connects the radially outward end portions of the pistons. To avoid friction between eccentric and pistons, provisions are made that the eccentric shaft is supported outside of the cylinder block. The radially outward end portions of the pistons project radially outwardly from the cylinders and, by way of the annular device, take support on the eccentric of the eccendtric shaft. The eccentric is rotatably supported in the annular device.

Abstract: A positive displacement pump useful under zero-gravity conditions is primed by the capillary wicking action of a fluid accumulator and a set of capillary plates located in a pair of pumping chambers. The fluid accumulator and capillary plates are closely spaced plates designed to draw water into the pumping chamber.

Abstract: A concentrate supply assembly for a post-mix beverage dispenser includes a plurality of containers for concentrate with discharge openings through which concentrate may flow. A plurality of conduits are coupled to the discharge openings and are in fluid communication with concentrate disposed within the containers. A multi-channel linear pump is provided with a pump body or bodies, including bores disposed within the pump bodies, pistons operatively mounted within the bores for reciprocation and piston shafts connected to the pistons. An A.C. synchronous motor is connected to the piston shafts for imparting constant-speed reciprocal motion to the piston shafts and to the pistons disposed within the bores. Inlet ports are in fluid communication with the conduits and bores for supplying concentrate thereto during a reciprocal motion of the pistons in a first direction.

Abstract: A method and apparatus for dosing viscous, aerated material like ice-cream and ice mixes. The method comprises filling a volumetric dosing chamber from a supply, dispensing said amount through a dispensing conduit and returning at least part of the material remaining in said conduit to the supply. The apparatus comprises two preferably coupled three-way valves, the one connecting a dosing chamber with either a supply or a dosing conduit, the other connecting a suction device with either the dosing conduit or the supply.

Abstract: Disclosed is an exchange transfusion device with two coupled, automatically driven syringes, one in a blood withdrawal system and one in a fresh blood injection system; the coupling insuring that the volume of blood removed from a baby in the withdrawal system will be simultaneously replaced by an equal volume of fresh blood from the injection system. This simultaneous equivolumetric withdrawal and injection overcomes the physiological problems arising from the non-simultaneity of equal volumes of withdrawal and injection. The syringes in the withdrawal and injection phase of an exchange transfusion are driven at a slow steady rate, but on the refill and discard phase are driven at a high rate to avoid clotting of standing blood in the withdrawal and injection systems.

Abstract: A compact electromagnetically driven air pump comprising a valve body provided with two air inlets and two outlet pipes and a pump chamber provided on each side of the valve body, whereby two separate air passages are provided therein and said pump can supply air to two aquarium gadgets with equal pressure, is disclosed. This pump is more compact and less noisy than the prior art air pumps with two pump bodies.

Abstract: A dispensing device for discharging material under pressure, includes at least one accumulating chamber for receiving and accumulating material to be dispensed and operable to discharge the material under pressure over a sustained period of time for use as desired, and at least one expansible chamber operable to incrementally move material from a container into the accumulating chamber for storage of the material under pressure, whereby a prolonged, pressurized discharge of the material can be obtained.