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: A hydraulic power transmission and braking system for vehicles in which individual hydraulic wheel motors are connected through suitable control apparatus to a variable displacement hydraulic pump which is driven by an appropriate power source. The displacement of the pump varies automatically in response to hydraulic fluid pressure and flow rate requirements imposed by the vehicle operating conditions. The power transmission control apparatus automatically switches from the 4-wheel drive mode to the 2-wheel drive mode as the vehicle accelerates past a predetermined speed. The braking control system proportions the braking force applied to each of the hydraulic wheel motors in accordance with the load imposed on that wheel by the vehicle operating conditions.

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.

Abstract: A pump assembly is disclosed which includes a pump which is externally controlled to vary with time the volume and/or the pressure of fluid pumped therethrough. A memory unit is programmed to provide a desired volume-time and/or pressure-time characteristic. The output of the memory is utilized to drive the pump to provide the aforementioned pump characteristics. Provision is made for appropriately modifying the stored program in accordance with preselected parameters so that the pump can, for example, operate in conjunction with an artificial heart.

Abstract: A boost pump incorporates a low-flow impeller pump for charging the inlet of a gas producer fuel pump and a high-flow impeller pump for charging the inlet of an augmentor fuel pump. The low-flow pump is connected to a drive shaft so as to be continuously driven thereby. The drive shaft may be placed in driving connection with the high-flow pump through the medium of a friction clutch which is engageable by the application of a fluid pressure. Disengagement of the high-flow impeller, when augmentation is not required, significantly contributes to an increase in pump efficiency and a reduction in heating of the fluid being pumped.

Abstract: A hydraulic system including a variable-delivery pump and a pressure compensator having a spring load applied to one end of the compensator spool. Means are provided for applying a force to the other end of the compensator spool proportional to the pressure obtained from a variable pressure-dividing system connected between the pressure line and tank. This pressure dividing system may consist of a pair of restrictors at least one of which is adjustable. Alternatively, it may consist of a spring-loaded check valve between the pressure line and the compensator chamber and a restrictor from the compensator chamber to tank.

Abstract: A multi-piston swash plate type compressor, in which there is provided an improved internal arrangement for lubricating internal moving elements, especially steel ball bearings and shoes connecting the swash plate and the multi-pistons. The improved internal arrangement for lubricating the steel ball bearings and shoes comprises providing means for directly introducing a part of said oil particles suspended in the refrigerant gas which rushes into the combined block from the exterior of the compressor through one or more inlet ports formed in the combined block, into a swash plate chamber for rotatably mounting the swash plate therein, whereby the oil particles lubricate said ball bearings and shoes during operation of the compressor. The improved internal arrangement further contributes to effective employment of the blow-by refrigerant gas for distribution of oil lubricant to the cylinder bores along with said internal moving elements.

Abstract: A system for the linear control and calibration of the flow of fluid through a pump in which the pump has a linear flow rate-to-fluid propeller speed relationship over a range of flow rates. A DC motor driving the fluid propeller has a linear drive speed-to-armature voltage relationship over a corresponding range of drive speeds. The voltage applied to the armature is regulated DC, the value of which provides an indication of the fluid flow rate. The system has particular utility in portable air pollutant measuring applications where a measured volume of air is pumped through a filter tube filled with a porous solid sorbent which is later subjected to chemical analysis.

Abstract: A pump check valve control apparatus includes a pump for delivering a fluid to a system. A valve between the pump and the system controls the delivery of the fluid to the system. A valve actuator, signalled by an actuator control, begins to open the valve when the pressure on the pump side of the valve substantially equals the system pressure. During the opening cycle of the valve, a substantially constant pressure is maintained in the system. The actuator control closes the valve so that flow through the valve ceases when the pressure differential across the valve is substantially zero.

Abstract: A piston type compressor for use with an automotive air conditioning system with the capabilities of successfully operating over a wide range of ambient temperatures including apparatus to automatically modify the compressor displacement in response to operating conditions. The effective displacement of the compressor is decreased in response to decreasing ambient temperatures to prevent an excess of compressor capacity over the cooling capacity of the evaporator at that temperature. The modulating apparatus includes pressure responsive valving mounted in the piston to monitor inlet pressure which correspond to operation during low ambient temperatures.

Abstract: A radial piston machine has a rotor which turns within the confines of a surrounding annular control face and is provided with substantially radial cylinder bores each accommodating a radially slidable piston having an outer end provided with a piston shoe formed with guide portions projecting circumferentially of the rotor beyond the associated piston and having contact faces which are in sliding engagement with the control face. Each of the contact faces has a hydrostatic bearing constituted by a depression surrounded by a sealing land, and recesses are formed in the respective contact faces outwardly spaced from the sealing lands, so as to separate the latter from outwardly adjacent portions of the contact faces.

Abstract: The rotary piston pump of a hydrostatic transmission for automotive vehicles has a slide block which is shiftable by a plunger in the cylinder of a follow-up control. The plunger is biased against the slide block by pressurized fluid in a chamber of the cylinder and can be shifted under or against the fluid pressure in the chamber by a control valve wherein a reciprocable spool controls the flow of fluid to the chamber from the pressure outlet of the pump. The spool is shifted in response to changes in fluid pressure at the opposite sides of a flow restrictor installed in a conduit which is connected to the outlet of the pump whereby the spool seals the cylinder of the follow-up control from the tank and from the pressure outlet of the pump before the chamber of the cylinder receives pressurized fluid to thereby change the position of the plunger and slide block.

Abstract: The primer valve disclosed herein includes a housing having an inlet communicating with a fuel source, an outlet communicating with an engine intake manifold, and a flow passageway extending therethrough from the inlet to the outlet. A port surrounded by a valve seat separates the flow passageway into upstream and downstream portions. Flow of the fuel through the flow passageway is controlled by a diaphragm which is movable relative to the valve seat between port opening and port closing positions and is urged toward the port closing position by a spring. Fuel pressure in the upstream portion of the flow passageway acts on the port closing side of the diaphragm and forces the diaphragm toward the port opening position to permit the fuel to be admitted into the engine intake manifold. As a vacuum condition develops in the intake manifold after the engine is started, and consequently in the port, the spring urges the diaphragm to the port closing position to thereby shut off the flow of the fuel to the engine.

Abstract: A refrigerant compressor having pistons reciprocated in respective cylinder by a wobble plate driven by an input rotor which is secured on a drive shaft, which compressor has a reduced volume and an improved lubricant system. An end plate of a housing for the compressor supports and bears the drive shaft and is formed with an oil port extending from a shaft seal cavity mounting a shaft seal of the drive shaft to a gap between the end plate and the rotor, with the drive shaft being formed with another oil port extending the shaft seal cavity and a gap between the rotor and the wobble plate whereby the lubricant oil flows through the gap between the rotor and the wobble plate, the oil port in the drive shaft, the shaft seal cavity, the oil port in the end plate, and the gap between the rotor and the end plate in the order. The rotor is formed with an annular recess on a surface thereof facing the end plate and in eccentricity from the rotating axis of the rotor.