Abstract: An infusion system includes a double action infusion pump. The pump includes a cylinder and a reciprocating piston received within the cylinder, the reciprocating piston separating a first pump chamber from a second pump chamber of the cylinder. A reciprocating motor is coupled with the reciprocating piston, and the first and second pump chambers alternate between filling and evacuating conditions with reciprocation of the reciprocating piston through operation of the reciprocating motor, and the speed of reciprocation is varied to provide a continuous output of fluid between the first and second pump chambers. A fluid source and a catheter are optionally coupled with the double action infusion pump. The catheter includes one or more infusion ports near a catheter distal portion, and the one or more infusion ports receive and expel the continuous output of fluid from the double action infusion pump.

Abstract: This delivery module includes: a pump for making the liquid flow; and an electronic circuit for controlling the pump. The delivery module further includes a channeling block having two channeling elements which define, when they are superimposed, channels for the liquid and which include: an inlet channel and an outlet channel.

Abstract: A volumetric pump comprising a product metering piston 28 mounted inside a metering chamber 22 so as to slide, a sleeve 14 at least partially delimiting an intake chamber 16 and an exhaust chamber 18 for the product, and a product dispensing means 24 is provided. The dispensing means comprises an intake member 34 comprising product passage means 44d that are able to at least partially face an inlet orifice 48 of the metering chamber, and an exhaust member 36 comprising product passage means 50d that are able to at least partially face an outlet orifice 54 of said chamber. The intake and exhaust members are situated axially on either side of an internal partition 42 of the sleeve and are each mounted so as to bear axially against said partition.

Abstract: A borehole pump assembly operable in association with for a borehole with a well casing therein, the borehole pump assembly including an elongate pump rod operably connected to a reciprocating drive and mounting a reciprocating pump at the lower end within the well casing and an air chamber provided immediately above the reciprocating pump and concentrically about the pump rod to provide hydraulic shock absorption between the reciprocating pump and a delivery pipeline.

Abstract: A method for feeding pasty masses using a pump device which has a piston pump with at least two cylinders, each having one piston, is disclosed. Each cylinder of the pump device is connected to a pre-fill container via an inlet opening and to a feed line via an outlet opening. Pasty mass is fed from the pre-fill container into the respective cylinder during a suction stroke of a cylinder with the inlet opening open and the outlet opening closed, and pasty mass is fed into the feed line during a pump stroke of a cylinder with the outlet opening open and the inlet opening closed. The piston velocity is greater during the suction stroke than during the pump stroke. Near or at the end of the suction stroke, the inlet opening is closed, whereafter the pasty mass is compressed in the cylinder before the outlet opening is opened.

Abstract: A fluid end 15 for a multiple reciprocating pump assembly 12 comprises at least three plunger bores 61 or 91 each for receiving a reciprocating plunger 35, each plunger bore having a plunger bore axis 65 or 95. Plunger bores being arranged across the fluid head to define a central plunger bore and lateral plunger bores located on either side of the central plunger bore. Fluid end 15 has suction valve bores 59 or 89, each suction valve bore receiving a suction valve 41 and having a suction valve bore axis 63 or 93. Discharge valve bores 57 or 87, each discharge valve bore receiving a discharge valve 43 and having a discharge valve bore axis 63 or 93. The axes of at least one of suction 10 and discharge valve bores is inwardly offset in the fluid end from its respective plunger bore axis.

Abstract: A modular fluid end for a multiplex plunger pump, each module machined from a single-piece steel forging with a plunger bore intersected by a linear suction/discharge bore and pumped fluid is discharged straight out through a top of the module into a discharge manifold made up using 1502 frac iron components. A compression clamp applies a crush load to opposed sides of the modules to extend service life.

Abstract: A device for metering out a flowable mass, especially a mass containing fat, for producing confectionery products, for example to a nozzle for extruding a mass into a mold. The mass traverses an inlet opening (13) and enters a chamber (8) from where it can be extruded through an outlet opening (14) by a plunger (7). A rotary piston (12) is associated with the plunger (7) and closes the outlet opening (14) in a position of use and the inlet opening (13) in a second position of use. The rotary piston (12) has a recessed portion (16 to 19) which extends from a front edge (15) of the rotary piston (12) towards its peripheral surface (25).

Abstract: The invention relates to a piston pump for thick matter, in particular for high-solids sewage sludge, coal sludge and concrete. The piston pump has at least one delivery cylinder (16) which contains a motor-driven or hydraulically driven delivery piston (20) and which has an orifice (12) which communicates alternately with the interior of a material feed container (10) and with a pressure delivery line (30) in a slide-controlled manner in accordance with the movement of the delivery piston (20). In order to significantly increase the degree of filling of the at least one delivery cylinder (16), an annular nozzle (32) opening into the delivery cylinder (16) in the region of the orifice (12) is provided, and this annular nozzle (32) is connected to an external pressure line (34) to which a lubricant can be admitted.

Abstract: The present invention provides a reciprocating compressor for a refrigerator capable of restraining an increase in temperature of a refrigerant discharged and increasing refrigerant compression efficiency. The compressor according to the present invention includes a housing (16) having cylinder bores (30), pistons (32) fitted in the respective cylinder bores (30) and each capable of reciprocating motion in the bore (30), an intermediate pressure chamber (68) arranged in the housing (16) and supplied with the refrigerant at a low temperature from a gas-liquid separator (10) of the refrigerator, and a rotary valve (78) arranged between the chambers (33, 68). The rotary valve (78) is rotated in association with a main shaft (34) of the compressor and opened to inject the low-temperature refrigerant into each compression chamber (33) from the intermediate pressure chamber (68) while the compression chamber (33) is in a process of compressing the refrigerant.

Abstract: A double disc pump includes a stationary main pump housing block that can remain fixed to its supporting frame while all other parts of the pump are removed for servicing. This permits disassembly of the pump without disconnecting the inlet or outlet plumbing and is provided by a pump housing which is vertically divided along parallel horizontal planes into housing segments. An intermediate housing segment is hingedly mounted to the main block segment. A bottom housing segment is hingedly mounted to the intermediate housing segment. These three segments capture all of the internal parts of the pump including the suction and discharge discs and the trunnion seals. The hinged design of the segments allows them to conveniently swing away from other parts of the housing so that access to the internal structures can be accomplished without completely removing each segment.

Abstract: A suction structure is provided for allowing refrigerant into a suction pressure region in a fixed displacement piston type compressor. The compressor includes a rotary valve. The suction structure includes a shifting device which shifts between a connecting state and a disconnecting state. The shifting device includes a valve body, a return spring, a first and a second displacement chambers, and a throttle passage. The return spring urges the valve body from a connecting position toward a disconnecting position. The volume of the first displacement chamber is displacable in accordance with an amount of a fluid inside therein. The volume of the second displacement is displaced. The fluid is filled in the first and the second displacement chambers. The throttle passage connects the first displacement chamber to the second displacement chamber. The fluid flows through the throttle passage when the volume of the first displacement chamber is displaced.

Abstract: A fluid end for a duplex mud pump. In one implementation, the fluid end includes two liner blocks, each having a central passage. The fluid end further includes two fluid inlets disposed on a side portion and two fluid outlets disposed on a top portion and a suction manifold displaced from the two liner blocks. The suction manifold comprises four flanges. The fluid end further includes four suction valve blocks, each having a bottom portion removably coupled to one of the four flanges and a side portion removably coupled to the side portion of the liner block, and four discharge valve blocks, each having a bottom portion removably coupled to the top portion of the liner block.

Abstract: A mini pump comprises a body includes a head, a handhold portion extending from the head and a groove, a nozzle device having a cover element, a nozzle and an anti-sliding element, with the anti-sliding element disposed on the head and partially received in the groove. The cover element engages the anti-sliding element to cylinder and prevents the nozzle from coming off the body. The handhold portion and the anti-sliding element are respectively made of resin with different hardness. The material of the handhold portion of the body is tougher than that of the anti-sliding element of the nozzle device.

Abstract: A fluid end for a duplex mud pump. In one implementation, the fluid end includes two liner blocks, each having a central passage. The fluid end further includes two fluid inlets disposed on a side portion and two fluid outlets disposed on a top portion and a suction manifold displaced from the two liner blocks. The suction manifold comprises four flanges. The fluid end further includes four suction valve blocks, each having a bottom portion removably coupled to one of the four flanges and a side portion removably coupled to the side portion of the liner block, and four discharge valve blocks, each having a bottom portion removably coupled to the top portion of the liner block.

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 radial, fluid pressure actuated motor having sets of opposed axially aligned cylinders arranged in a spaced relation about a crankshaft, each set of cylinders having a common push rod extending between them. Each push rod has a central Scotch yoke with an elongated slot, the yokes being arranged in overlying spaced relation, the slots being arranged in right angular intersecting relation. A primary or main crankpin extending from the crankshaft extends in journaled but slidable relation through the slots of the Scotch yokes. Fluid pressure is fed into, and exhausted from, each of the cylinders in a predetermined cyclic order, the fluid pressure operating to power, in both directions of travel, axial movement of the push rods thereby imparting continuous rotating motion to the crankshaft via the main crankpin.

Abstract: A motorized pump is disclosed that includes a flexible diaphragm fitting within a rigid member, a motor drive mechanism for drawing a puller member attached to the diaphragm away from the rigid member to create a space between the diaphragm and the rigid member and form a negative pressure region within that space, and an outlet communicating with the negative pressure region. In one embodiment, the pump provides a negative pressure in a single chamber which can be used to operate one or two breast shield assembles. In another embodiment, the pump is particularly adapted for double-pumping and provides two chambers which generate vacuum.

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 controllable positive displacement pump for liquids and gases which may contain dispersed phase particles includes a pair of pistons operating out of phase. Each of the pistons is associated with an inlet valve which includes a fixed grating defining slots which extend parallel to piston travel and a complementarily configured grating which reciprocates transversely in timed relationship with the piston to control the influx of fluid. A rotary outlet valve is also associated with each piston and includes a rotating member 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 to transport powder paint.

Abstract: A piston pump comprising at least one working space, which is surrounded by a cylinder and which is adapted to be varied by a piston arranged in said cylinder, and at least one inlet valve as well as at least one outlet valve, said valves being lifting valves and being adapted to be controlled and driven by a control and drive means. In order to provide a piston pump which can be cleaned more easily and which includes the smallest possible number of dead spots, a first teaching according to the present invention suggests that, when closed, the inlet valve should be located nearer to the working space than when it is open. Alternatively, the underlying technical problem is solved according to a second solution of the present invention by the feature that the valve surface of the inlet and/or outlet valve(s) facing the working space merges without any steps with the inner surface of said working space at the closed position of the valve or of each valve.

Abstract: A cylinder is divided into two chambers by a wall to receive a pair of pistons. This reduces the stroke length and correspondingly reduces the linear speed of the piston. This leads to a reduced PV factor associated with degradation and wear of the piston rings. Moreover, the multi-cylinder arrangement provides the same performance in an oil-free compressor assembly without appreciably expanding dimensional constraints relative to known systems.

Abstract: A high accuracy and high precision pump for fluids, specifically for use in chemical and/or medical analyzers includes a female-thread or nut inside the motor rotor shaft and a male-thread or lead screw mated with the female-thread or nut supported by a bearing that restricts the rotation of the lead screw. The lead screw slides axially, and is connected directly to a plunger or piston which is moved forward or backward by the rotation of the motor rotor. The end of the plunger or piston cylinder chamber includes a common fluid path switch-over valve by which fluid flow may be switched over to a plurality of fluid paths. Movement of pumping components, including pump(s), nozzle(s), valve(s), and tubing, is unified to eliminate volume changes due to changes in fluid tubing flexion.

Abstract: A sewage lifting station having at least two solid waste collection chambers for receiving pumped solid waste-contaminated sewage. The station has a collection tank for receiving pre-treated waste water flowing from the solid waste collection chambers via connection pipes. Each solid waste collection chamber is connected to a pump to empty the collection tank via one of the connection pipes and solid waste collection chambers to pump the current of sewage into a pressure pipeline. There is a closing device connected to each connection pipe to selectively close an exit orifice in the connection pipe and open a connection to an operating pump to drain the collection tank. A control device alternately closes and opens the exit orifices with the closing devices so that an exit orifice allocated to an operating pump is closed and an exit orifice allocated to a non-operating pump is simultaneously and automatically opened.

Abstract: A reciprocating piston type compressor for compressing refrigerant gas includes a cylinder block with a plurality of parallel cylinder bores arranged around the longitudinal axis of the cylinder block, the cylinder bores having bore ends as discharge ports of the same diameter as that of the cylinder bores, a plurality of pistons slidably provided within the cylinder bores for reciprocating between the top and bottom dead centers, the inner surface of the cylinder bores and the end faces of the piston defining compression chambers, housing means sealingly mounted to the either ends of the cylinder block, the housing means including at least a discharge chamber into which the compressed refrigerant gas is discharged from the compression chambers through the bore ends, a drive shaft for driving compressing motion of the reciprocating pistons within the cylinder bores, the drive shaft extending along the longitudinal axis of the compressor, and valve members for closing the bore ends of the cylinder bores, the v

Abstract: A dual-piston pump apparatus includes a pair of reciprocating sleeves within which a pair of reciprocating pistons are disposed. The pistons and sleeves are each supported on a frame for independent reciprocating movement along a line angled relative to horizontal by an angle of less than about 60.degree.. The apparatus also includes a piston construction including a removable face which permits the piston to be broken down for cleaning. Each piston is normally restricted by a stop from extension beyond the end of the corresponding sleeve, but an actuator is provided for freeing the piston relative to the sleeve so that the piston may be extended beyond the sleeve and the sleeve may be withdrawn from a pump chamber of the apparatus.

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: An axial piston pump for pumping a medium such as a viscous liquid in which a wobble element is set into rotating movement via a piston, the wobble element moving at least one feed piston in a piston bore. The piston bore is intended to communicate, via a transverse line and a further piston bore which is occupied by a control piston, with an intake line for the medium to be pumped. By means of this axial piston pump, which is valve-controlled on the compression side and slide-controlled on the intake side, liquid having a high viscosity can be pumped without a loss of efficiency, and any noise produced by the pump can be reduced. These latter advantages are reinforced still further provided the feed system is received in a pump insert that is supported with respect to a pump housing by means of elastic bearing elements.

Abstract: An axial piston device with a plurality of mechanically actuated, rotory valves having their front faces sealing for the control of flows of fluid is suggested for the connection of ports of its housing to ingoing and outgoing passages of a combustion engine or of other pump arrangements, motoring or transmission arrangements. The device includes working chambers which periodically contract and expand their volumes to take in and expel flows of fluid from the working chambers to and through the valves to the ports and for reversed flow direction. The device is thereby specifically suitable for the communication to external combustion chambers which burn coal powder fuel and which are provided with means to remove, in the external combustion chamber or in a passage, unclean particles from the hot gases before they enter into the expander unit of the device.

Abstract: A hydraulic pump comprising at least a reciprocating piston, each piston being associated with one suction valve returned to its closing position by a return spring. The return spring is associated on the one hand with the valve and on the other hand with a push-piece cyclically actuated by a cam driven by the pump driving shaft in such manner that the action of the spring on the suction valve is cancelled during the suction phase and reestablished at the end of the suction phase.

Abstract: A hydraulic pump having spring loaded valves utilizes a spring providing a constant spring force and a spring providing a varying spring force. The varying spring force depending upon the position of the pump piston. The pump suction valve opens after a variable delay relative to the beginning of the piston suction phase when the pressure prevailing in the pump's dead chamber falls below a predetermined value. Abrupt decompression to the dead chamber is therefore avoided resulting in reduced energy consumption and noise level.

Abstract: Concrete is transmitted from a hopper forming a part of a mobile concrete pumping apparatus to the deposit site through a flow line having a Y-pipe inlet. The pumping apparatus includes two piston-cylinder concrete pumps mounted in side-by-side relationship adjacent the hopper, which has an auger to rapidly charge a pump with concrete through one of two discharge pipes. Each pump is pivotally mounted, to locate the cylinder aligned with the discharge pipe or with one inlet of the Y-pipe inlet. Each pump has a valve plate pivoting with the cylinder to alternately close the hopper opening and the inlet line. Hydraulic cylinder units are coupled to the valve plates to pivot the pumps. A floating valve plate has coupling pipes attached to the hopper and a hydraulic cylinder urges the same into sliding sealing engagement with the rotating valve plate.

Abstract: A reciprocating infusion pump is presented having a pair of syringes activated by individual actuating cylinders. The actuating cylinders are interconnected with a hydraulic fluid, and the cylinders and alternately pneumatically actuated whereby the cylinders alternately act as drive and follower cylinders whereby one syringe delivers fluid to a patient while the other is refilled from a reservoir. A directional adapter set is affirmatively actuated in synchronism with the actuating cylinders to control the direction of fluid flow from the reservoir to the syringes and from the syringes to the patient.