Abstract: This disclosure relates to a pumping apparatus that includes a hopper for receiving concrete with a delivery line extending from the hopper and a cylinder cooperating with the hopper to deliver concrete to the delivery line. A valve has an outlet end connected to the delivery line and is pivoted within the hopper between two positions to alternately connect the cylinder to the delivery line and to the hopper for delivering concrete to the delivery line and then withdrawing concrete from the hopper for subsequent delivery. An adjustable wear plate is located adjacent the inlet end of the valve so that continuous contacting engagement can be maintained between adjacent surfaces of the valve and the plate. The valve also has rigidifying means associated therewith and is supported on the hopper in a manner to prevent distortion during movement thereof.

Abstract: A hydraulic pump arrangement and control circuit for supplying fluid at high volume and a high pressure to a work circuit. The system utilizes a fixed displacement pump, a variable displacement pump, a dual pressure compensator, and an unloading valve working together to provide high pressure fluid delivery while reducing the horsepower requirements of the fixed displacement pump and the variable displacement pump. High flow is provided through the utilization of the combined pumps and high pressure is attained through the unloading of the fixed displacement pump through the unloading valve and destroking of the variable displacement pump in response to signals provided by the dual pressure compensator.

Abstract: A controller maintains a constant desired fluid pressure in a fluid load driven by a variable flow fluid pump with a variable speed motor. A set point signal representing desired pressure and a signal from a pressure transducer representing actual pressure are applied to an error amplifier. The resulting error signal is applied through a variable gain stage to the motor control. The variable gain stage includes first and second variable gain amplifiers the first of which has a gain which is controlled inversely to pressure. The second variable gain amplifier has a gain which is controlled in proportion to flow. In this manner, the gain of the controller changes in inverse proportion to the restriction of the fluid load. This makes the performance of the controller independent of changes in the fluid load by keeping the total loop gain constant.

Abstract: A fuel delivery system comprised of a differential having three associated shafts. A first shaft is rotated at a speed responsive to the engine speed and drives the differential. A second shaft is driven by the differential against a variable retarding torque, which torque varies the speed of the second shaft. A third shaft is driven by the differential and drives a variable speed, fixed displacement fuel pump at a speed responsive to the speed of the second shaft combined with the speed of the first shaft.

Abstract: A radial piston pump wherein the drive shaft for the pistons in radially extending cylinders of the housing has an eccentric which moves the pistons outwardly against the opposition of springs. The inlet port of the housing communicates with the cylinders by way of a first passage which contains a reciprocable valve member and can discharge fluid directly into one of the cylinders. The other cylinders receive fluid from the first passage by way of an annular space which surrounds or is adjacent to the inner end of the shaft and bores which are machined in the housing to connect the annular space with the other cylinders. The outlet port of the housing can receive pressurized fluid from the cylinders by way of check valves. The valve member is biased by a spring to normally assume a first position in which it allows fluid to flow from the inlet port to the cylinders as long as the pressure at the outlet port is within a first range of pressures.

Abstract: A swash plate pump of the type wherein a plurality of pistons bear against the swash plate and are given a reciprocating movement when the plate is rotated by a drive shaft. The drive shaft comprises a solid portion and a hollow portion which latter constitutes a central admission conduit for the liquid to be pumped. The swash plate is mounted at the junction between the solid and hollow portions of the shaft, and the plate has an aperture which communicates with the central conduit and a crescent-shaped port for liquid distribution to the pistons. These pistons are arranged in a circle concentric with the solid shaft portion. A taper roller bearing is mounted on the hollow shaft portion and the front face of the swash plate bears against the roller bearing. The discharge flow of liquid can be divided for distribution into several separate flows by a cylindrical sleeve located on the solid shaft portion.

Abstract: An intensifier unit includes a pair of sequentially operated reciprocating ram assemblies, each powered by a cylinder motor. Extension of the cylinder rods is accomplished by application of pressurized hydraulic fluid to the pistons. The pistons are returned quicker than they are extended by means of continuous application of pressurized air to the back side of the pistons. The cylinder motors are precompressed prior to their respective forward strokes by means of an accumulator which continuously bleeds from the main hydraulic fluid supply line. Circuitry is provided to insure that precompression continues even if the ram and its driving piston move from their retracted position. Also disclosed is a safety interlock to shut down the intensifier if both cylinder rods become accidentally simultaneously extended.

Abstract: A swash-plate type compressor for air conditioning of vehicles. A pair of cylinder blocks are rigidly combined in coaxial alignment. The combined cylinder blocks form three bores. A piston is slidably disposed in each bore and the motion of each piston is actuated by a swash-plate mechanism mounted on a drive shaft which is connected to a driving source. A lubrication reservoir is formed in a sector space sandwiched by a pair of said bores and an inside wall of said combined cylinder block. A geometrical longitudinal center line of said combined cylinder block is biased downward from a geometrical center line of said drive shaft.

Abstract: A piston shoe for fluid pressure pump motors of the piston type is substantially disc-shaped and includes a concave portion provided upon one end face thereof for seating the convex portion of a piston rod associated with the piston and cylinder assemblies of the pump motor, while the other end face thereof is substantially flat for contacting the sliding surface of a swash plate. A holder or retainer is also provided in association with the shoe for retaining the piston rod within the concave seat, such retainer being secured to the shoe by biasing means, or alternatively by being pressed or crimped thereon.

Abstract: A pump control system of the liquid level responsive type includes an air pump to pressurize a pressure responsive control unit in accordance with the level of water within a well, the system having an electrical control circuit including a switch which operates to turn off the air motor and turn on the water pump motor when the water level in the well reaches a certain high level and to turn off the pump motor and turn on the air motor when the water level reaches a certain low level in the well.

Abstract: A reciprocating fuel pump for an internal combustion engine comprising a body having an outer wall defining a pumping chamber and a pair of generally cylindrical projections in fluid communication with the pumping chamber, the projections defining an intake cavity with an intake check valve therein and a discharge cavity with a discharge check valve therein. Elastomeric tubular conduits within the projections form the intake and discharge cavities and are of a flexibility sufficient to provide a collapsing and an expansion of the conduit walls upon relatively small pressure variations resulting from the suction and discharge strokes of the diaphragm. The elastomeric conduits thereby provide pulsating chambers to smooth out the flow of fuel and thereby increase the fuel flow through the fuel pump.

Abstract: The improved clearance pocket or chamber for compressors described in this specification includes a hollow housing attached to the cylinder of the compressor. The housing is divided into two clearance chambers and into three power chambers. A valve member located in the housing is movable to provide communication between the compressor cylinder and one or both of the clearance chambers. Movable pistons operably arranged with respect to the valve member are located in the power chambers to position the valve member in the desired position. Suitable fluid power means is connected with the power chambers to cause the desired movement of the pistons.

Abstract: An emergency sump pump is employed in a sump from which the liquid is normally removed by a main pump. The main pump turns on when the liquid rises to an upper level and turns off when the liquid drops to a lower level. The emergency pump has a vertical intake conduit which opens at the bottom below the lower level. This conduit is surrounded by a tube which has openings in areas below the lower level and above the upper level. The tube is solid between those two levels and also is solid above the upper area of openings.

Abstract: Systems for delivering fluid at substantially constant pressure to consuming loads which exhibit widely varying demands. The systems employ parallel connected booster pumps which may be operated in either of two rotational directions to provide two output flow rates for each pump.

Abstract: A pressure regulator for an adjustable pump has an adjustable member for regulating the amount of fluid delivered by the pump. The position of the adjustable member is adjusted by two pistons of different diameters acting from opposite sides of the adjustable member and in which pressure of the fluid delivered by the pump is directed through a passage controlled by a control valve to one of the cylinder bores in which one of the pistons is closely guided. The control valve is movable by the fluid pressure between a neutral position in which fluid from the pump is prevented from flowing into the cylinder bore of the one piston, and two working positions, in one of which fluid from the pump will flow to the cylinder bore of the one piston while part of the fluid will flow over a throttle to a space at atmospheric pressure, and in the other of which fluid will flow unthrottled from the cylinder bore of the one piston to the aforementioned space.

Abstract: A variable displacement axial piston pump has a rocker cam for controlling the output of the pump. The rocker cam is driven by a fluid motor member. A valve with a follow-up device regulates pressure fluid flow to the fluid motor member to move the rocker cam. Both the fluid motor member and a part of the follow-up device are rigidly secured to and movable with the rocker cam to provide precise positioning of the rocker cam.

Abstract: This horticulture system mixes and meters two liquids in precise and determinable quantities and provides for appropriate control of the liquid flow. A water tank and a chemical tank are respectively coupled by constant volume pumping means to a mixing and discharge nozzle means. The pumps are driven by a common motor to obtain a predetermined flow ratio. A pressure responsive bypass valve means is connected between the output side of the pumps and the respective tanks to provide an automatic bypass of the respective liquids to their respective tanks in response to the opening and closing of the discharge nozzle. The bypass function of the bypass valve is controlled by pressure generated in the system. Bell means are provided to respond to the presence of flowing chemicals in the chemical output line to indicate that a metered volume or flow of chemicals is occurring and to provide an indication of the relative flow volume.

Abstract: A hydraulic intensifier for oil well fracturing and/or erosion drilling incorporates a pair of intensifier units mounted on a common bed. The intensifier units are particularly defined for ease of maintenance in the field, and structure is provided by which the ram seals as well as the ram, the ram cylinder, and the hydraulic cylinder can be easily and readily removed in the field without the necessity for releasing the tension on the tie rods. To this end, the apparatus includes a front wall which supports the ram cylinder and an intermediate wall which supports the forward end of the hydraulic cylinder. The space between these walls and the manner in which the components are assembled permits the ram seal assembly, the ram and ram cylinder, and hydraulic piston to be extracted and reinserted. Also, an improved ram return system and a hydraulic cushioning system are disclosed.

Abstract: There is disclosed a pump and adjustable supporting structure arranged to be mounted to a tractor through the conventional three-point tractor hitch arrangement and which is adjustable for vertical positioning upward and downward with respect to the ground level and is also adjustable to render the centrifugal pump housing level (and the discharge pipe vertical) with respect to the pool of water to be pumped in addition to which the direction of discharge from the vertically disposed discharge pipe is fully adjustable through 360.degree.. The support structure is also readily dismantled for replacement of parts, for storage, or for shipping, but is never-the-less quite rigid and rugged.

Abstract: An hydraulic system is disclosed for driving a plurality of hydraulic power units, such as warping and retaining winches on ships, each connected to an hydraulic supply network with a constant network pressure. Each hydraulic power unit is adjustable for torque output and a volume regulating device controls the amount of hydraulic fluid supplied to each unit. The torque adjustment and the volume regulation are interconnected to simultaneously control both operating parameters.