Abstract: An electric pump device includes a single motor, a pump that discharges fluid from a discharge port with driving force of the motor, and a flow passage switch that includes outlets configured to be in communication with the discharge port and switches an outlet of the outlets that is in communication with the discharge port with driving force of the motor.

Abstract: A pneumatic installation, especially an air suspension installation for a vehicle, operates in conjunction with a compressed air supply installation and comprises: a gallery line, at least one air spring having a pressure chamber, which can be pneumatically connected to the gallery line, an accumulator for compressed air, which is pneumatically connectable to the gallery line, and a compressed air port for pneumatic connection of the pneumatic installation and the compressed air supply installation. The pneumatic connection comprises a controllable shut-off valve system, which is formed by at least one directional valve and has first, second and third ports, the accumulator being pneumatically connected to the first port, the compressed air port being pneumatically connected to the second port, and the gallery line being pneumatically connected to the third port, the second port being switchable to a closed state in which the pneumatic connection is completely closed in both directions.

Abstract: A fluid working machine comprising a controller and a working chamber, an electronically controllable low pressure valve associated therewith and a fast high pressure valve associated therewith, characterized in that the working chamber has associated therewith a slow high pressure valve for controlling the connection of the working chamber to a secondary high pressure manifold. A fluid working machine according to the invention may be operated to rotate its shaft to a certain position, for example to allow easy maintenance of a wind turbine generator.

Abstract: In a reciprocating piston pump, piston 34 has first or upper end 48 and second or bottom end 50 having inlet 52 and outlet 54 bores respectively located therein. Inlet check 32 is located in bore 52 while outlet check 42 is located in bore 54. As can be seen in FIG. 3, each of bores 52 and 54 branches into three (in the preferred embodiment) flow paths which alternate and are intertwined. It is the unique flow paths incorporating both the inlet and outlet check valves in the piston that are the key features of the invention.

Abstract: In a pump apparatus of the present invention, a portion of fluid sent to a fluid-sending destination is circulated to a pumping driving chamber on one side of a cylinder through a circulation passage. The pump apparatus includes a switching valve which switches inflow and outflow of the circulated fluid with respect to the pumping driving chamber. The switching valve is connected to a piston rod through a link mechanism, and mechanically carries out the switching operation using a pumping driving force.

Abstract: A compressor includes a working chamber in which a piston for compressing a gas can be displaced, a piston disposed in the working chamber, an inlet connection communicated with the working chamber, the inlet connection guiding a gas to the working chamber; an outlet connection communicated with the working chamber, the piston being displaceable within the working chamber to displace gas from working chamber via the outlet connection; a plurality of openings in a wall of the working chamber, the openings being communicated with the outlet connection for permitting gas flow from the outlet connection back to the working chamber, the openings being respectively covered and uncovered by the piston as the piston moves within the working chamber; and a particle filter arranged in a flow path of the gas between the inlet connection and the outlet connection.

Abstract: A pump device may include a main body which may have an inflow passage in communication with an inflow port, an inflow side active valve disposed in the inflow passage, a pump chamber connected to the inflow passage, a pump mechanism disposed in the pump chamber, a plurality of outflow passages extended from the pump chamber and respectively in communication with a plurality of outflow ports, and outflow side active valves respectively disposed in a plurality of the outflow passages, wherein the outflow side active valves are disposed in a plane manner around the pump chamber. The pump may be capable of accurately discharging an appropriate amount of fluid.

Abstract: A multi-channel pump includes a pump chamber, an inflow passage connected to the pump chamber, two or more outflow passages connected to the pump chamber, outflow side active valves provided so as to correspond to the outflow passages, and a movable body reciprocated to change a volumetric capacity of the pump chamber. The movable body may be a piston reciprocated within a cylinder that is connected to the pump chamber. A control method for a multi-channel pump includes an initial discharge step between a suction step and a discharge step. The multi-channel pump may be preferably utilized in a fuel cell.

Abstract: A device for releasing gas into molten metal includes a base having a discharge. The discharge has a first section including a first cross-sectional area and a second section including a second cross-sectional area, wherein the first section is upstream of the second section and the first cross-sectional area is smaller than the second cross-sectional area. A gas-release opening is positioned so that it can release gas into one or more of the first section or the second section. As the molten metal moves from the first cross-sectional area to the second cross-sectional area gas is released into the molten metal and the molten metal flow helps to draw the gas into the flow, thereby lowering the pressure required to release gas into the molten metal. Metal-transfer conduits other than a discharge incorporated in a pump base are also disclosed, as are pumps including either a discharge or other metal-transfer conduit according to the invention.

Abstract: A metering device contains a rotor which defines elongate chamber, there being a shuttle contained within the chamber movable between two terminal end positions. Frusto-conical surfaces defined on the rotor cooperate with annular members defining corresponding seats. One passage extends from one end of the chamber to one frusto-conical surface, and another passage extends from the other end of the chamber to the other frusto-conical surface. Each annual element defines a respective inlet and outlet for fluid and a shuttle is present within the chamber. As the rotor rotates, the shuttle effects a shuttling movement thus measuring dispensed volumes of fluid. A sensor is provided to detect physical contact of the shuttle with the end of the chamber to cause the rotor to advance.

Abstract: A fluid motor includes a plurality of fluid actuated pistons 13 extending radially outwards from a stator and each having a cam follower bearing 14 at its outer end. A rotor surrounds the stator and includes an inwardly facing drive cam profile engaged by the cam follower bearings 14 to advance the rotor relative to the stator. The drive cam profile 8 is substantially sinusoidal as a result of which substantially constant torque is achieved.

Abstract: A portable air compressor includes a frame, a motor mounted to the frame, a storage tank coupled to the frame and a compression mechanism in communication with the storage tank. The motor drivingly engages the compression mechanism. The compressor includes a first regulator coupled to the storage tank for defining a first pressure at a first outlet port. A second regulator is coupled to the storage tank for defining a second pressure output at a second outlet port.

Abstract: To eliminate influence of discharge amounts depending on changes in liquid level of a liquid storage tank and to improve discharge accuracy of a liquid discharging apparatus. By a pressure regulating opening portion for forming a reference liquid surface maintaining a given pressure, pressure inside a pump chamber before a discharging operation is kept constant without affecting liquid level existing in the liquid storage tank. Therefore, volume of the inside of the pump chamber is kept constant and liquid can be discharged with higher precision.

Abstract: A piston pump comprised of a cylinder (2), an automatically closing intake valve (3) to a pump chamber (4), a sealing reciprocating piston (5) and a sealing upstream filter piston (7), wherein the piston (5) together with the filter piston (7) are elastically spring-biased and axially limitedly moveable and form together with the filter piston (7) an automatically closing discharge valve (8).

Abstract: In a lubricating device for a plurality of lubricating stations, in particular for supplying lubricant to knitting machines, a pump device is provided that serves at the same time as a distributor device. To that end, the pump device has a piston which is provided with a control groove. The corresponding pump cylinder has an inlet and a plurality of outlets distributed over the cylinder wall. Depending on which of the outlets the control groove of the piston is made to coincide with, a corresponding lubricating station is selected. The pump device is thus a distributor device as well.

Abstract: The invention relates to a closed level control system for a vehicle. The closed level control system includes a pump which transfers a pressurized medium between a pressurized medium supply vessel (4) and pressurized medium chambers (2a to 2d). The input (8) of the pump (6) is connected to the supply vessel (4) and the output (10) of the pump (6) is connected to the pressurized medium chambers (2a to 2d) when the pressurized medium is to be pumped from the supply vessel (4) into the pressurized medium chambers (2a to 2d). If, in contrast, pressurized air is to be pumped from a pressurized medium chamber (2a to 2d) into the supply vessel (4), then the input (8) of the pump (6) is connected to the pressurized medium chamber and the output (10) of the pump (6) is connected to the supply vessel (4). The above-mentioned connections preferably take place via controllable directional valves (14, 18). The level control system makes it possible that the pump (6) has to always run only in one direction.

Abstract: This invention pertains to an air compressor having a cylinder head with an air supply passage communicating with a discharge hole. First and second exhaust passages are arranged in parallel between the air supply passage and an exhaust port. A pilot-operated switching valve is located at an intermediate position in the first exhaust passage. A solenoid-operated exhaust valve is located at an intermediate position in the second exhaust passage. The solenoid-operated exhaust valve is selectively opened or closed by an externally supplied electric current, thereby controlling a pilot pressure applied to a valving element of the pilot-operated switching valve. The valving element is rested on or separated from a valve seat by the pilot pressure. The compressed air discharge speed can be increased without increasing the size of the cylinder head, and vehicle height adjustment, for example, can be made in a reduced period of time.

Abstract: The present invention provides an air compressor which includes an air drier filled with a drying agent and having a first passage for supplying compressed air to one air supplied part while absorbing moisture from the compressed air by passing the compressed air through the drying agent (27) and a second passage (28a) for supplying the compressed air to another air supplied part without passing the compressed air through the drying agent. The air supplied through the first passage returns through the same passage to dry the drying agent.

Abstract: A pulsating vibration air generator in which wave height, frequency and wave shape of the pulsating vibration air can be optionally modified and such pulsating vibration air can be periodically and continuously emitted. The pulsating vibration air generator has a valve chamber with an inlet port and an outlet port where a valve plug and a valve seat with a control opening are provided and a cam mechanism which moves the valve plug to open or close the opening of the valve seat, whereby positive or negative pulsating vibration air is emitted from the outlet port while pressurized air is supplied into the inlet port or air is sucked from the inlet port.

Abstract: The pump has a sleeve-like bearer. This contains a bush in which a piston is displaceable along an axis. The bearer inner surface and the bush outer surface are adjacent to one another in parts and are separated from one another in parts by an intermediate space. The inlet of the pump is connected through an intake chamber located at least partly inside the bush and through the piston, via a non-return valve, to a pump chamber, which is connected via another non-return valve to a primary outlet of the pump. The intermediate space connects the inlet and the intake chamber to a secondary outlet which is a distance away, along the axis, from the inlet and the intake chamber. During the operation of the pump, fluid flows from the inlet through the intermediate space to the secondary outlet and cools the bush.

Abstract: A liquefied gas pump includes a piston and a cylinder which form a pump chamber into which a liquefied gas entrance path and a liquefied gas discharge path open. Relative upward and downward motion between the piston and cylinder provides a repetition of alternating suction and discharge stroke. Liquefied gas is sucked into the pump chamber through the entrance path during the suction strokes, and is discharged out of the pump chamber through the discharge path during the discharge strokes. A separate bubble discharge path opens into said pump chamber at a location in the bottom of an upward recess formed in the top portion of the pump chamber. The bottom of the recess is located above the location where the opening of the liquefied gas discharge path is formed.

Abstract: In a method of injection fuel for Diesel engine comprising a high pressure injection pump with a fuel supply line for supplying high pressure fuel to fuel injection nozzles wherein a fuel control line extends between the pump and a low pressure fuel supply line for discharge in excess fuel thereto under the control of a magnetic valve which is closed to end the discharge of excess fuel and initiate pumping of fuel, the magnetic valve is opened at the end of fuel pumping at a point corresponding to a piston stroke length h after the upper dead center of the piston such that, when communication between the pump and the low pressure fuel line is established, pressure pulses in the low pressure fuel line are avoided.

Abstract: A reciprocating piston fluid pump according to the present invention comprising: a pump driving section including a cam operated by an engine and a roller driven by the cam, the roller being provided at a lower end of a piston rod; a piston provided at an upper portion of the piston rod; a pump chamber housing the piston and divided into a piston upper chamber and a piston lower chamber by the piston, the pump chamber including a bearing opening at a central portion of the piston lower chamber, through which the piston rod extends; a rod seal retainer portion provided between the piston rod and the bearing opening of the pump chamber; a spring for urging the piston rod downwardly; oil passage means for communicating the pump upper chamber or the pump lower chamber with the bearing opening, the oil passage means being provided on an oil seal member or the piston rod; oil supply means for supplying lubricating oil to the pump driving section or the bearing opening; and at least one communication hole provided b

Abstract: A metering pump comprises a pump chamber with a diaphragm for delivering a metering agent to a metering point. The pump chamber is adapted to be connected with the metering agent tank through a suction conduit comprising a suction valve. Moreover, a return conduit comprising a head valve is provided.For providing an automatic bleeding or ventilation of the metering pump and the possibility of using the pump also for metering aggressive media, the outlet of the pump chamber is adapted to be connected with the metering point through a second head valve. The outlet is connected with the return conduit and a bleed valve is provided in the return conduit.

Abstract: A plunger of a plunger pump is formed with an air vent passageway having its one end open to a compression chamber and the other end adapted to communicate with a reservoir space open to the atmosphere when the plunger comes near its top dead point. Air or gas trapped in the liquid sucked into the compression chamber will flow into the air vent passageway so as to be discharged into the reservoir space when the passageway gets into communication with it. Since air or gas is removed from the compression chamber, the pumping efficiency is prevented from decreasing.

Abstract: A liquid additive injection pump has a hydraulic motor comprising a differential piston assembly reciprocable in a housing under the urging of a primary liquid into which an additive is to be injected. The piston assembly includes valves to effect the transfer of a primary fluid charge from the pump motor to a discharge passage and to effect reciprocation of the piston assembly. The motor piston is connected to a central axially disposed piston rod which extends into an additive injection pump cylinder. In one embodiment a floating additive injection pump piston has a stack of displacement control washers engaged therewith and disposed on the piston rod. In another embodiment the pump piston passes through a seal member between a pump chamber and a bypass chamber and an elongated spiral groove formed on the periphery of the pump piston determines the effective displacement of the pump.

Abstract: Several embodiments of venting arrangements for the lubricant pump of a two-cycle, crankcase compression internal combustion engine for an outboard motor and having a positive lubricating system. In each embodiment, the lubricant pump is provided with a vent passage that extends from an upper portion of a chamber of the pump for venting air from it. In each embodiment, an arrangement is provided for permitting air flow from the fluid pump without returning to the fluid pump. In some embodiments, this means comprises a check valve and in another embodiment, it comprises a restricted orifice.

Abstract: A high pressure low volume grease pump is provided having a pump and a surrounding distributor adapted for sequentially distributing grease to a plurality of outlets and a reservoir delivering grease to the pump and receiving grease from any outlet not connected to a gland.

Abstract: An automatic vent valve having a stoppage member within a flow chamber located between an inlet chamber and vent chamber with said stoppage member being biased against a lower seat. The stoppage member moves between said lower seat and an upper seat in response to pressure changes associated with the operation of a positive displacement pump which either overcomes said biasing means or allows said biasing means to function. During the movement of the stoppage member between the upper and lower seats a flow path exists between the inlet chamber and vent chamber such that gases and/or fluid are vented on each stroke of the pump.

Abstract: The progressive distributor contains a control piston which is slidable in a cylinder. The piston contains a main channel and a plurality of radially disposed distribution channels for distributing lubricant. The cylinder has feed channels which are aligned with feed channels in a housing of a machine part to be lubricated and are arranged in offset relation to the distribution channels of the piston. The respective distribution channels and feed channels are arranged so that during movement of the piston in the cylinder, the various feed channels are progressively supplied with lubricant.

Abstract: A dosing pump (1) is created allowing to accurately dose a medium to be dosed as a function of time or of a flow rate. The dosing pump (1) utilizes a predelivery obtained by a diaphragm (11) as well as a piston-cylinder-pump for dosing. The pump cylinder is connected with the suction conduit so as to prevent any pressure drop when the piston emerges from the cylinder. A crystallization or polymerization of the dosing agent in the piston-cylinder-means is thereby prevented.

Abstract: A fluid-transfer system has two pistons movable within a barrel so that the ends of the piston faces can move together or apart, the barrel having at least two openings therein for transfer of fluid into and out of said barrel. The pistons can be controlled manually, mechanically or by computer to draw fluid from one or more reservoirs into the barrel and transfer the selected fluid in selected quantity into a chamber for storage or for reaction or analysis. The system is particularly useful for transfer of fluid from a selected chamber to another selected chamber, for mixing fluids, and for carrying out multiple tests on blood taken from a patient or from a plurality of patients under the control of a computer, which can accept programs for carrying out specific procedures.

Abstract: A fuel injection system includes a pumping plunger which is actuated by an actuating means to displace fuel through a valve controlled outlet. In order to reduce the fuel pressure quickly at the end of the stroke of the plunger valve means is provided which opens due to continued movement of the pumping plunger after the stroke of the actuating means has been halted by a stop.

Abstract: A liquid metering pump has power-operated poppet valves in its intake and return conduits. The quantity of liquid discharged is controlled by a movable cam which determines how long the liquid return conduit is open. A switch operated by a portion of a pumping diaphragm prevents excess pressure from damaging the pump.

Abstract: The specification describes a distributor apparatus provided with a plurality of distributor valve arrangement in a circular pattern and including valve plungers. The distributor apparatus includes a rotary distributor cam provided with a single distributor lobe for orbiting in the circular pattern and for moving the valve plungers in succession from a non-distributing to a stationary distributing position. The cam lobe has a planar face for holding the valve plungers in the distributing position throughout the entire delivery stroke of a pump unit plunger metering and pumping fuel to the distributor apparatus.

Abstract: A method and apparatus for pumping combustible gases at high pressure without raising the gas to its combustion temperature, the apparatus including a piston-type pump having an intake chamber communicating with a cylinder through intake valves, a discharge chamber communicating with the cylinder through discharge valves, the intake chamber and the discharge chamber having cooling means therearound for cooling gas in the chambers, the valving being such that gas must pass entirely through the intake chamber for maximum cooling on intake, and gas must pass entirely through the discharge chamber on discharge for maximum cooling on discharge, some gas being held in the discharge chamber during compression of the gas for maximum cooling.

Abstract: A water-sealed type vacuum pump characterized in that a suction pipe connected to a chamber to be vacuumized above liquid containing cylinders, which are provided at the lower portion thereof with a mechanism for alternatively increasing and decreasing a pressure of liquid, is open to a lower portion of a suction chamber through an intake valve, the liquid containing cylinders each being interiorly provided with a valve means so as to discharge the liquid through the valve means when the liquid pressure is high while to suck air from the suction pipe when the liquid pressure is low, and a liquid circulating device is provided to return the liquid to be discharged thereby effecting stabilized suction and discharge, the liquid containing cylinders being further interiorly provided with a fluid cooling device to cool and liquidize the sucked air.

Abstract: A fuel burner pumping system includes a pump having an inlet communicating with a fuel source and an outlet which communicates with a control valve assembly for regulating the pressure of the fuel supplied to the fuel burner nozzle or nozzles through a nozzle passage leading from an outlet port of a main chamber in the control valve assembly. High pressure fuel is pumped into the main chamber through a first outlet passage leading from the pump. A second outlet passage leading from the pump to the nozzle passage by-passes the control valve assembly so that air may be purged from the system when the pump initially is started. An air purging valve within the second outlet passage is movable between closed and open positions for blocking fuel flow through such passage during normal operation of the pump and for opening the second passage when the pump initially is started.

Abstract: In a lubricating device for a plurality of lubricating stations, in particular for supplying lubricant to knitting machines, a pump device is provided that serves at the same time as a distributor device. To that end, the pump device has a piston which is provided with a control groove. The corresponding pump cylinder has an inlet and a plurality of outlets distributed over the cylinder wall. Depending on which of the outlets the control groove of the piston is made to coincide with, a corresponding lubricating station is selected. The pump device is thus a distributor device as well.