Abstract: A method for the start up of a concrete pump using a small amount of an aqueous suspension of polymers, amorphous silicone dioxide and water-reducer rather than a conventional cement slurry.

Abstract: A user-replaceable pumping chamber for a consumer piston pump has a reciprocating piston seal secured to the end of a piston by a threaded fastener. The chamber further has a smooth-bored cylindrical sleeve surrounding the seal to form a cylindrical wall for the chamber. The seal is retained to the piston by a threaded shoulder screw and washer acting against an O-ring in an end face of the seal. The housing has an aperture providing access to the cylindrical sleeve to permit levering a worn sleeve out of the housing.

Abstract: The objects of the invention are to prevent the backflow of slurry by first enclosing it in a closed space and then using air to force it along a discharge channel, and at the same time to ensure the smooth throughput of the slurry by causing any foreign bodies in the slurry to be broken up en route. To this end, the invention is provided with a casing enclosing a circular cross-section rotor chamber and a rotor which fits inside said rotor chamber and which is caused to rotate by a drive means. The rotor is also fitted with blades en bloc which extend radially from the rotating center section and which form moving chambers that rotate along with the rotor inside the rotor chamber. The casing is also provided with an intake port that connects with the moving chambers at the slurry intake point and a discharge port and air supply port, each of which connects, with the moving chambers at the slurry discharge point.

Abstract: A rotary/reciprocating liquid dispensing pump for dispensing liquids in the nanoliter range has a narrow radial slot extending longitudinally from an end of a reciprocating, rotating cylindrical piston sliding in a smooth cylindrical bore of a pump housing at a closed end thereof, which slot extends outwardly to the periphery of the piston. The piston is selectively positioned in alignment with one of a plurality of circumferentially spaced small diameter radial passages within the housing opening directly to the cylindrical bore in the path of rotation of said slot. The ports thereof opening to the cylindrical bore are spaced circumferentially a distance in excess of the width of the slot. A linear liquid dispensing pump apparatus including such pump includes a stepping motor and an electromagnetic clutch/braking mechanism concentrically surrounding a lead screw, and the lead screw is threadably engaged with a stepping motor tubular rotor shaft.

Abstract: A translating apparatus for an optical pickup device comprises an optical pickup device for radiating an optical disc with a light beam, a rack member attached to the optical pickup device, a supporting device having a guide portion for guiding the optical pickup device along a diametrical direction of the optical disc, and a translating device including a gear attached to the supporting device and meshed with the rack member, a drive apparatus for rotating the gear and a releasing mechanism for releasing the gear and the rack from being meshed with each other when the optical pickup device is translated beyond a predetermined translating range.

Abstract: A water powered sump pump has a control housing connected to a source of water under pressure and to a drain pipe located in a sump. An outlet pipe leads from the control housing to a suction generating assembly in communication with the drain pipe for entraining water from the sump for discharge elsewhere. A diaphragm closure normally closes a water passage in the housing and divides the housing into two chambers. A passageway through the diaphragm enables the pressure of water in the two chambers to be equalized. A bleed line communicates between one of the chambers and the sump. A valve responsive to the rise of water in the sump initiates the flow of water through the bleed line, thereby enabling lowering of the pressure in the chamber with which the bleed line communicates and enabling the pressure of water in the other chamber to unseat the diaphragm and open the passage.

Abstract: An improved evacuation pump system with dual inlet check valves uniquely designed to evacuate both lidded rigid containers and sealable flexible containers. A vacuum cup fixed to one end of a reciprocating piston pump attaches to the lid of rigid containers for their evacuation and a flexible probe connects to the pump for flexible container evacuation. To achieve this dual function two check valves mounted in the lower end of the pump are provided for the flexible container evacuation mode. One prevents discharge flow into the flexible probe and the other maintains suction in the cup to keep the pump attached to its supporting surface.

Abstract: The disclosure relates to a collapsible flexible pump which includes an inflatable spring and framework. The inflatable spring framework is formed by attaching a layer of flexible material over selected exterior portions of the flexible material pumping chamber to form a passageway therebetween. Inflation of the inflatable spring framework via an inflation valve, results in the collapsed flexible pump distending into a three dimensional pumping chamber inscribed by the inflated spring framework. The pumping chamber includes appropriate inlet and discharge valves. By applying a compressive force to the pumping chamber, the volume of fluid within the pumping chamber is forced out through the discharge valve. The restoring tendency of the distended inflatable spring framework returns the pump chamber to the extended position on the returning intake stroke. A plurality of exemplary inflatable articles are disclosed.

Abstract: A piston pump for conveying a fluid includes a cylinder which is not flanged to the pump casing, but rather is inserted in the pump casing and is retained in the longitudinal direction by a pretensioned spring. A seal is arranged between the cylinder jacket and the pump casing in order to seal the pressure side with respect to the suction side of the piston pump. An extremely compact piston pump results therefrom, suitable, in particular, for use in the low-temperature range due to very low cold losses.

Abstract: The pump comprises a cylinder delimiting a pumping chamber in which a piston is mounted to slide between an admission orifice and a delivery orifice, the piston including a pumping orifice which is associated with a closure member mounted to pivot about an axis adjacent to the pumping orifice and including a closure face that is substantially plane and that faces the piston.

Abstract: A new integral motor/pump design utilizing a combination centrifugal enclosed impeller, shaft and feeder conduit. Whereby the impeller drive shaft serves a dual purpose of providing applied power from the hollow motor driveshaft directly to the impeller blade or blades and also is a fluid entrance conduit for the impeller media feed. The present invention hollow motor drive shaft, hollow impeller shaft and enclosed impeller also incorporates optional changeable impeller leading edge blades. These blades help facilitate the most efficient flow of various fluids and pumped media. The present invention utilizes simplicity of design whereby inspection and service accessibility is optimized. Design configuration renders radial thrust bearing curves more applicable to a broad range of applications and extended motor/pump service life.

Abstract: A cylinder head of a hermetic reciprocating compressor comprising a main base mounted on a head plate of a cylinder of the compressor, an exhaust cover for exhausting a compressed fluid which was compressed in the cylinder, the exhaust cover being mounted on the main base, and a suction cover, including resonance chamber, for sucking a fluid which is to be compressed in the cylinder, the suction cover mounted on the main base so as to have a horizontal and vertical part, the horizontal and vertical part being spaced from the exhaust cover in a predetermined clearance. The present invention provides a cylinder head for a hermetic reciprocating compressor in which the temperature of the intake refrigerant gas is considerably reduced, thereby providing advantage in that it improves the compression efficiency of the compressor such as about 8% increase in case of 24 cc grade compressor and about 12% increase in case of 75 cc grade compressor.

Abstract: The invention relates to a pump arrangement, especially for the operation of an osmotic water purifier comprising a filter housing (10) having a raw water inlet (11), a filtrate outlet (15), a reject outlet (16), and a flush valve (18) adapted to be opened for flushing raw water through the filter housing. The pump arrangement comprises a high pressure pump (12) for supplying raw water at the required pressure, and a circulation pump (13) for recirculating a relatively large flow through the filter housing. The high pressure pump (12) consists of a sliding vane pump of the type in which the vanes (24) are caused to sealingly engage the surrounding wall of the pump chamber by a hycraulic pressure supplied from the pressure side of the high pressure pump.

Abstract: A pump for dispensing accurately measured amounts of fluid has a one way check valve in the flow path on the upstream side of a pump chamber and a one way check valve in the flow path at the downstream side of the pump chamber which is of variable internal volume. A flow passage provides fluid communication from the upstream check valve to the pump chamber and enters the pump chamber by a centrally located opening that is surrounded by a valve seat. One wall of the pump chamber is a flexible and elastic diaphragm that is attached to the plunger portion of a solenoid actuator. The plunger and diaphragm are biased by a spring acting upon the plunger such that, in the absence of excitation of the solenoid coil, the diaphragm is biased against a valve seat, preventing flow through the pump.

Abstract: A rotary reciprocating engine has a rotating center shaft and a rotating outer rim with a rotational eccentricity in relation to the center shaft. The engine has a synchronization mechanism including a synchronizing hub, a guide rail, one cam member fitted to the center shaft, and another cam member fitted to the outer rim. The synchronization mechanism has the same rotational eccentricity in relation to the center shaft as the outer rim, but the rotational axes of the synchronization mechanism and the outer rim are on opposite sides of the rotational axis of the center shaft. The synchronization mechanism restrictively guides rotation of the center shaft and the outer rim, and transfers and balances the forces and moments generated by the pressure medium in the engine, leading to the pistons and cylinders being subjected to axially directed forces only and not moment transferring cross head forces.

Abstract: The invention relates to a valve-controlled positive displacement pump having valve triggering, which permits the forced opening or keeping open of an inlet valve, operating in the manner of a non-return valve, of a displacer working space, so that the displacer working space remains connected to the inlet side of the unit even during the working stroke of the displacer, and the assigned displacer is not able to work efficiently. The design according to the invention is particularly suitable for radial piston pumps.

Abstract: A diaphragm pump has a first fluid-operated valve which opens when the diaphragm performs a suction stroke and a second fluid-operated valve which opens when the diaphragm performs a compression stroke. The volumetric efficiency of the pump is enhanced by constructing at least one of its valves in such a way that the central portion of a resilient disc-shaped valving element, whose marginal portion bears against a seat when the valve is closed, abuts a supporting surface having a diameter selected in dependency on the diameter of the valving element, the thickness of the valving element and the Shore hardness of the material of the valving element in such a way that the selected frequency of the diaphragm in actual use of the pump induces a resonant frequency of the valving element. This also contributes to a reduction of noise and renders it possible to reduce wear upon the valving element and the adjacent parts of the respective valve.

Abstract: A compressor with no moving parts in the traditional sense having a housing having an inlet end allowing a low pressure fluid to enter and an outlet end allowing a high pressure fluid to exit. Within the compressor housing is at least one compression stage to increase the pressure of the fluid within the housing. The compression stage has a quantity of magnetic powder within the housing, is supported by a screen that allows passage of the fluid, and a coil for selectively providing a magnetic field across the magnetic powder such that when the magnetic field is not present the individual particles of the powder are separated allowing the fluid to flow through the powder and when the magnetic field is present the individual particles of the powder pack together causing the powder mass to expand preventing the fluid from flowing through the powder and causing a pressure pulse to compress the fluid.

Abstract: A cushioning means for an intensifier for delivering ultra high pressure water to the cutting head of a water jet cutting apparatus. The intensifier has a power piston and cylinder assembly connected to secondary fluid pumping piston members which extend into pumping chambers located at opposite ends of the hydraulic piston and cylinder assembly, and in a common housing. Inlet poppet valves located in the pumping chambers control the flow of water from inlet passage into the pumping chambers while outlet poppet valves allow ultra high pressure water to be pumped out of the pumping chamber into an accumulator fluidly connected to the cutting head. Hydraulic fluid under pressure is sequentially directed to opposite ends of the piston and cylinder assembly, with the piston and cylinder assembly being provided with cushioning means to assist in smooth deceleration of the piston during each stroke or cycle.

Abstract: A control system for a variable displacement hydraulic pump with a two-lever type of feedback lever mechanism. The control system comprises a pressure responding ram for causing, upon receiving pump output pressure or outside pilot pressure, a servo spool of a servo valve to be displaced, the servo valve for causing a larger chamber of a servo cylinder to be selectively supplied with the pump output pressure, the servo cylinder for controlling angle of inclination of a swash plate of the pump in order to control the pump output flow rate, a two-lever type of feedback lever mechanism for linking the pressure responding ram, the servo spool of the servo valve and the servo piston of the servo cylinder to each other.