Abstract: In the positive control of piston compressor valves, during the suction stroke the pressure is sensed in the suction/compression space and the suction line and during the compression stroke the pressure is sensed in the suction/compression space and the delivery line with signals generated by the sensors being transmitted to a comparator unit. The comparator unit is connected to a control unit. Based on the signal sent to the comparator unit and the rated value for the operation of the compressor, signals are sent from the comparator unit to the control unit and, in turn, the control unit selectively regulates the suction valve and the delivery valve of the compressor.

Abstract: A fluid pump assembly having a body provided with a fluid chamber and a passage having an orifice, the passage connecting the chamber to a conduit carrying a pressurized flow of fluid. Pump apparatus has an inlet connected to a fluid additive supply, and an outlet which communicates with the conduit for feeding the fluid additive to the conduit. Control apparatus includes a dump passage communicating with the chamber and has a cross section larger than the orifice. A dump valve controls the flow of fluid through the dump passage to regulate the fluid pressure in the fluid chamber, and motor apparatus operatively connects the pump apparatus and the dump valve. The motor apparatus is responsive to the fluid pressure in the fluid chamber for operating the dump valve and actuating the pump apparatus to pump fluid additive through the outlet.

Abstract: An electromagnetic pump characterized in that two independent coils disposed adjacent each other and via a common magnetic path are used for actuating a plunger and a valve, respectively, thereby preventing the generation of noises and abrasion during the operation of the pump. This also attains the quick return of the valve to its home position at the time when the pump stops, thus resulting in the complete stoppage of oil leak.

Abstract: A constant-volume increment pipetting arrangement for use particularly in connection with analysis of minute specimen volumes of biological fluids. The arrangement, which is designed to have a very low inertia factor, comprises a pumping unit having a pair of two-port valves with a duct running between a port from each valve, wherein at least a portion of the duct wall is movable to provide a variable volume pipetting chamber. The second port of one valve serves as the intake port for the fluid to be pipetted and the remaining port of the other valve serves as the delivery port. Three reciprocating drive elements are provided, connected one each to the valves and to the movable portion of the duct wall. Associated with the drive elements is a sequential control means, wherein the control means portion for the drive element connected to the moving portion of the duct wall constitutes an electromagnet arrangement energizable by a periodic supply.

Abstract: A check valve which closes more rapidly to prevent wearing of the valve seat and of the valve member that seals thereagainst, including a solenoid or other actuator that aids the normal spring to quickly close the valve at approximately the time when downpath fluid flow would stop, the actuator then being deenergized. The control circuit that operates the actuator can include a pair of pressure sensors sensing pressure both upstream and downstream from the valve seat. Where the valve is utilized to control flow to or from a piston pump, energization of the actuator can be controlled by sensing when the pump piston reaches its extreme of travel.

Abstract: A solder extractor apparatus is configured as a self-contained bench unit ving a pump motor to provide an instantaneous source of pressure or vacuum available to the operator from a common port on the apparatus, the pump being started by the operator when he lifts the solder extractor iron from its support holder, and thereafter, the use of the pressure or vacuum being controlled by a foot operated switch so as to be available at the appropriate time in the solder extraction process.

Abstract: A magnet is fixed to a rotor shaft and a ferromagnetic cup which is magnetically coupled to the magnet is urged opposite to the direction of rotation of the rotor shaft by a spring. An occluder plate is fixed to the cup and is movable into alignment with a fluid inlet to block the same. As the speed of the automobile and thereby the compressor rotor shaft speed increase the magnetic fields resulting from eddy currents induced by the magnet in the cup increase and the degree of magnetic coupling thereby increases so that the cup is rotated further against the force of the spring causing the occluder plate to block the inlet to a greater extent so that the compressor output and thereby the cooling effect of the air conditioner are maintained at a substantially constant value.

Abstract: A fuel injection valve for an internal combustion engine includes a fuel storage compartment and a pressure chamber from which a reciprocating pump piston delivers fuel to the engine's fuel lines. The fuel conduit between the storage compartment and the pressure chamber can be closed off by an electromagnetic valve. To permit engine operation even when the electrical system is non-functional, the magnetic valve is of the normally open type, held open by a spring. In the energized state, the valve closes off the fuel conduit and its closure is aided by the fuel pressure gradient across the valve.

Abstract: A fuel injection pump for internal combustion engines has a simultaneously reciprocating and rotating pump piston which aspirates fuel from a fuel compartment and then delivers it under pressure to engine fuel lines. An electromagnetic valve can obturate the conduit between the fuel compartment and the pressure chamber of the pump, thereby shutting off fuel delivery. To permit manual override of this shut-off, the electromagnetic valve may be partially unscrewed from the pump housing, thereby lifting the valve closing member from its seat and permitting fuel flow. In another version, an externally accessible central valve bolt partially lifts the valve-closing member from its seat.

Abstract: An electromagnetic pump of the reciprocating type comprising a relief valve mechanism adapted to minimize the magnitude of pulsations of the fluid delivered by the pump and at the same time to act as a pressure accumulator. The relief valve mechanism comprises a pressure adjusting cylinder maintained in communication with the outlet side of the pump, a spring-loaded balancing plunger slidably mounted in the pressure adjusting cylinder, and a pressure adjusting screw adjustably mounted in the mechanism for regulating the biasing force of the spring so as to adjust the pressure applied by the spring to the balancing plunger to any level as desired.

Abstract: A piston compressor, in which an electromagnet coil is mounted on the outer side of the cylinder block cover and is used to actuate the suction valves of the cylinder block. The electromagnet coil is connected to each suction valve of the cylinder block through a magnetic circuit. The magnetic circuit is formed by the cylinder block cover, by the cylinder block body and by the pressure valve of each cylinder. The cylinder block cover and the cylinder block body are interlaid with a gasket made of nonmagnetic material.

Abstract: A hermetically sealed pump for abrasive slurries in which a auxilliary control takes over whenever the pump is unable to complete its stroke and causes rapid jogging reciprocation to dislodge solids which may have settled out and blocked the completion of the stroke.

Abstract: The pump has a piezoelectric variable volume chamber and a solenoid controlled valve operated in sequence to pump small volumes of liquid. The sequence is produced by developing a phase difference between the control of the piezoelectrical chamber and the solenoid valve.

Abstract: An automatic water powered sump drainer comprises valve means, a float assembly, a venturi, means connecting one side of the sump drainer to a water supply, and means connecting the other side of the sump drainer to a drain outlet. The valve means is supported in spaced relation to a sump hole and has operatively connected thereto the float assembly which includes a float ball positioned within a sump hole and connected to the valve means for movement between two extreme positions. Motion of the float ball is transmitted to the valve means and effects movement of a permanent magnet therein which in conjunction with armature means controls a diaphragm which opens or closes a through passage in the valve means. The venturi is formed in this through passage and is operable to cause water located in a sump hole to be withdrawn therefrom.

Abstract: An electromagnetic pump comprising an electromagnetic coil, magnetic paths constituting a yoke arranged in the electromagnetic coil, an electromagnetic plunger reciprocatorily mounted in the electromagnetic coil, and a main body including a suction port, a discharge port and suction and discharge valve means and connected to the electromagnetic coil. At least one of the magnetic paths has a reduced cross-sectional area portion at one end portion thereof disposed on the longitudinal axis of the electromagnetic coil and is formed with a magnetic gap between the reduced cross-sectional area portion and the end portion of the electromagnetic plunger. A movable iron member of the cylindrical shape is arranged in the magnetic gap in which the lines of magnetic force are concentrated in passing through the magnetic path. The movable iron member is moved upwardly by the electromagnetic force to facilitate further concentration of the lines of magnetic force therein.