Abstract: An actuator for moving a solenoid armature to control fuel in response to a control current is built into a fuel pump, with trapped air in and around the actuator preventing contamination of the actuator by ferromagnetic particles in the liquid fuel from the fuel pump.

Abstract: A chemical injector system for wells includes a solenoid operated valve delivering bursts of supply gas to a piston driven chemical injector pump. The solenoid valve allows very low cycle rates and also avoids plugging up of the gas supply line because the bursts of supply gas create high enough velocities to keep water and debris moving. A stand having a spike and a plate welded thereto supports the injector pump.

Abstract: A piston machine (10) has two pistons (42, 44) which are reciprocatable in two cylinders (20, 22) and which, in the first and second working chambers (50, 52) thereof, can be subjected to a working medium. The pistons are connected to a crankshaft (30) via two connecting rods (38, 40) which are pivotally connected to one and the same crank pin (36). The interior of the crankcase (18) forms a third working chamber (54). The crankshaft (30) is formed as a rotary slide valve which in operation of the piston machine (10) connects the first working chamber (50) to the third working chamber (54) and the second working chamber (52) to a working medium supply or discharge opening (14, 16). The piston machine can be used selectively as an engine (e.g. as an expansion motor operated with compressed gas) or as a working machine (e.g. as a compressor). The opening and closing times can be controlled exactly. For generating the same power, less working medium is required than in the prior art.

Abstract: A centrifugal suction pump includes a vertically disposed support tube having upper and lower ends, a liquid check valve on the lower end of the support tube, and a hollow rotatable hub mounted on the upper end of the support tube. A number of horizontally expeller tubes are connected to the hub and extend radially therefrom. A check valve is associated with the hub for venting the hub to ambient atmosphere and a priming conduit is connected to the support tube for filing the latter and the expeller tubes with liquid. A stopper is associated with each expeller tube and has an operative position that seals the expeller tube. Rotation of the expeller tubes causes radial displacement of liquid therein which effects movement of the stoppers to an inoperative position at which the tubes are unsealed and liquid is pumped up the support tube.

Abstract: An ejector pump having a plurality of longitudinally aligned chambers, each chamber including a pair of opposed end walls, at least two of the end walls having a nozzle and a one-way valve, with a connection to compressed gas to the most upstream of the nozzles, the pump having a single cylindrical pump body defining a cylinder or axially aligned cylinders with multiple end walls inserted therein, each wall having substantially the shape of a cross section through the cylinder or the respective cylinders. The end walls being secured to the cylinder at a point along the length of the cylinder or each end wall attached to the corresponding aligned cylinder.

Abstract: A motor compressor unit comprises a hermetically sealed housing, a vibration motor with a rotationally vibrating drive shaft, and a symmetrical twin free-piston compressor comprising two oppositely disposed identical free pistons which can be reciprocated in respective cylinders by the drive shaft. In order to minimize piston drift from the center position, each cylinder is formed with a duct connecting the respective compression space to the space between the housing and the motor-compressor where the suction pressure prevails, which ducts are situated at equal distances from the respective cylinder end walls and can be closed by the respective pistons. As a result of this, the pressure in both cylinders is built up with the same swept volume and piston drift is minimized.

Abstract: Improvements in motors powered by pressurized hydraulic fluid, or air. The mechanism comprises: two rotors, interconnected by pistons which are bent into identical angles, and are inserted into the corresponding receiving holes of both rotors. The pistons can be pressurized in one, or in both rotors simultaneously, thereby varying the torque output and speed of the motor.

Abstract: The invention relates to an ion sputtering pump having a housing with at least one getter module located in the housing. The getter module has a heating device. In order to reduce the amount of time required for the activation and regeneration of the getter module, the heating device is in direct, intimate thermal contact with the getter module.

Abstract: The micropump comprises a silicon wafer (22), glass wafers (2, 24) and a control element (26). The wafer (22) is machined to define an inlet valve (36), a pump chamber (34) and an outlet valve (48). The inlet valve (36) comprises a membrane (40) defining an upstream compartment (38) and a downstream compartment (62), an orifice (42) and a sealing ring (46) surrounding this orifice. The orifice (42) is pierced at a location in such a way that, during the priming of the micropump, the fluid arriving in the downstream compartment reaches a specific and unique part (60) of the downstream compartment wall before reaching other parts of the wall. The fluid is then propelled along the wall on both sides of the part (60) by pushing the air away ahead of it and thus guaranteeing that no air bubble can be formed in the downstream compartment.

Abstract: A high pressure liquid pump has a drivable swash plate and a plunger which is acted on by the swash plate and guided in a cylinder bore of the pump housing. In the region of the front end of the plunger facing the swash plate a valve arrangement is provided between a low pressure chamber and a pump chamber. A second valve arrangement is arranged between the pump chamber and a high pressure chamber. The plunger has a transverse bore which stands in communication with the low pressure chamber during the pump movement and also has an axial bore extending from the transverse bore to the front end of the plunger, with the axial bore being enlarged towards the front end while forming a ring-like valve seat, with a valve insert being arranged in the broadened section of the axial bore.

Abstract: A system for and a method of establishing and maintaining fluid at desired cleanliness, viscosity and temperature levels in a flow system. The system includes a driven pump that circulates fluid from a fluid source through a hydraulic loading system that includes an unloading valve. As fluid flows through the valve, a pressure drop is created across the valve operator, which restricts flow through the valve. This pressure drop across the valve operator results in the dissipation of heat, increasing the temperature of the fluid flowing through the valve. During operation of the system, if a low temperature condition is sensed in the system, power will be supplied to the pump, which pumps fluid through the valve at a controlled low pressure drop to result in a controlled heating of the fluid. When the fluid is restored to a desired temperature level, power to the pump is discontinued to terminate flow through the valve.

Abstract: A radial piston pump is described with dual pistons which are slidingly accommodated within a bushing coupled end to end to a valve body. Automatically controlled suction and discharge valves for a pressure chamber are arranged one behind the other in the longitudinal axis of the pump. The pistons are sealed by means of elastomeric seals compressed by an end of the valve body and bushing under pressure of a threaded sealing plug installed in the pump housing. The valves, valve body and bushing form a cartridge separately assembled and installed as a unit in the housing. The threaded sealing plug is formed with a damping chamber for damping of pressure pulsations.

Abstract: A peristaltic pump in which a tube is stably supported by a platen so as to be stably collapsed by fingers during normal operation, whereas, when an excessively large collapsing force is exerted by one of the fingers, the excess portion of the force is absorbed without fail so as to realize a stable pumping operation. The level or ability for absorbing the excess collapsing force is easily adjustable in accordance with changes in conditions such as the elasticity of the tube and the size of the tube. The tube can be stably set in a proper position between the platen and a group of the fingers.

Abstract: An axial flow blood pump for intracorporeal or extracorporeal use pumps blood axially through a cylindrical conduit disposed in the bloodstream of a patient. The pump further includes a pump stator mounted in the conduit and a motor stator located either externally or internally of the conduit which applies a magnetic flux in the conduit. A rotor located in the conduit carries permanent magnets which interact with the applied magnetic flux to rotate the rotor. The rotor also carries impeller blades which, during rotation, produces an axial flow of blood through the conduit. During rotor rotation, the rotor is radially suspended solely by one or more hydrodynamic bearings formed by blood flowing through the conduit, with the location of at least one hydrodynamic bearing defined by a radial gap between the inside surface of the conduit and the rotor.

Abstract: A reciprocatory piston type compressor having a cylinder block provided with a plurality of cylinder bores in which a refrigerant gas drawn from a suction chamber is compressed and discharged toward a discharge chamber from which the compressed refrigerant gas is delivered to a refrigeration system. The compressor further having an injection gas passageway for introducing a refrigerant gas at a relatively high pressure therein from a liquid-gas divider of the refrigeration system, and a rotary valve element rotated with a drive shaft of the compressor for equivalently injecting the high pressure refrigerant gas into every cylinder bore at a selected time and the compression of the refrigerant occurs in each cylinder bore.

Abstract: Disclosed is a swash plate type variable displacement pump. The pump comprises a spring which biases a swash plate in a direction of decreasing the tilting angle thereof, a hydraulic cylinder which controls the swash plate at the tilt angle according to a load on the pump by the resisting force against the biasing force of the spring, a valve allows a pressurized fluid to flow into the hydraulic cylinder when opened, and prevents the pressurized fluid from coming out of the hydraulic cylinder when closed, and a fluid discharge passage which gradually releases the resisting force of the hydraulic cylinder against the spring to slowly shift the tilt angle of the swash plate to 0.degree..

Abstract: A swash plate type compressor is provided with a plurality of cylinders and a front and rear cylinder blocks having a crank case connected to a suction port. The cylinder blocks are connected to a front and rear housing sections in order to cover the cylinders. Each housing section contains a discharge chamber. A drive shaft is rotatable supported by the cylinder blocks. One end of the drive shaft is sealed within the front housing. A swash plate is mounted on the drive shaft and is rotatably disposed within the crank case. A plurality of two-head pistons engage the swash plate via a pair of shoes. The pistons move within their respective cylinders in cooperation with the swash plate. The refrigerant is sucked into each cylinder via a suction passage, and is then compressed therein. The refrigerant is discharged into the external refrigerating circuit through the front and rear discharge chambers, .and the front and rear discharge ports.

Abstract: A variable displacement swash plate type compressor comprises a suction chamber, a discharge chamber and a crank chamber. A flow rate control valve mechanism is provided along a refrigerant supply passage, which connects the discharge chamber to the crank chamber. The flow rate control valve mechanism is provided with a discharge pressure chamber and an intermediate chamber. A valve hole is provided between the discharge pressure chamber and the intermediate chamber, to permit both chambers to communicate with each other. A pressure sensitive member is provided in the intermediate chamber to separate the intermediate chamber into a first and a second pressure sensitive chambers. The first pressure sensitive chamber communicates with the discharge pressure chamber via the valve hole. The second pressure sensitive chamber communicates with either the crank chamber or the suction chamber.

Abstract: A valve apparatus has a flow control valve having a supply passage communicating with a hydraulic fluid supply source, a load passage communicating with an actuator, and a first meter-in variable restrictor disposed between the supply passage and the load passage and opened dependent on an operation amount there; a first signal passage located downstream of the first variable restrictor and having a passage section for detecting load pressure of the actuator; a tank passage communicating with a reservoir tank; a discharge passage for communicating the first signal passage with the tank passage; and a second variable restrictor provided in the discharge passage and having its opening variable dependent on the operation amount of the flow control valve to produce in the first signal passage a control pressure different from the load pressure, the control pressure in the first signal passage being led to the hydraulic fluid supply source though a second signal passage.

Abstract: The rotating components of an exhaust gas driven turbocharger are supported by a pair of axially separated ball bearings having an outer race and an inner race. A spacer between the bearings engages the outer race of both bearings and exerts a preload bias on the outer races of the bearings urging the outer races away from one another. Accordingly the bearings are preloaded so that centrifugal forces generated during high speed operation will not force the ball bearing away from the inner races.