Abstract: A feed pump for a hydraulic system that is equipped with at least one outlet valve whose valve-closing body is loaded by a valve spring. The valve-closing body is held at a distance form its valve seat by means of a gas-filled hollow-body ring so that the feed pump can be evacuated through its outlet valve for subsequent filling with a hydraulic pressure medium. With a first increase in pressure in the system, the hollow-body ring is pressed together, so that the valve-closing body slips through the hollow-body ring and reaches its valve seat, thus making the outlet valve operational. The feed pump is suitable for use as a return pump for anti-skid systems of hydraulic brake systems.

Abstract: A lightbox for display purposes, such as advertising, comprises a rigid back plate adapted to be secured to a support surface, a light source carried by the back plate, and a front fascia of clear plastics material which can be flexed and which is held in place in a curved attitude on the back plate by the engagement of fastening means between the fascia and back plate. The fascia comprises outer and inner panels which sandwich a photographic transparency therebetween. Flexing of the fascia for mounting on the back plate causes the two panels to come into area contact with the transparency. Release of the fascia from the back plate causes the panels to be loosened and enables the transparency to be removed.

Abstract: In a peristaltic pump having a pump tube with an elastically deformable wall, which tube is arranged in a pump housing and has externally accessible connection ends and is fitted into the pump housing with a region which is curved in part-circular configuration around a shaft of a rotor of the peristaltic pump and at a radial spacing from the shaft, the cross-section of which tube is variable by pressure rollers which project radially from the rotor and which press the pump tube at least in its curved region against a correspondingly curved fixed support, producing a reduction in the internal volume of the tube, the rotor (20) itself has mounting eyes or bores (52) for the roller spindle (54) of the pressure roller (58), which is mounted in the rotor interchangeably in an aligned pair of bores parallel to the shaft (18) of the rotor.

Abstract: A gas and steam turbine plant includes a coal gasification plant, a gas turbine connected downstream of the coal gasification plant, a steam turbine having a water-steam loop and a steam generator connected downstream of the gas turbine. The steam generator includes a preheater connected to the water-steam loop, a heater of a high-pressure stage connected downstream of the preheater, and a heater of a low-pressure stage connected upstream of the preheater. An outflow line leads into the coal gasification plant and is connected to the water-steam loop downstream of the preheater, as seen in water flow direction. A heat exchanger has a primary side integrated with the water-steam loop between the low-pressure stage and the high-pressure stage and a secondary side connected parallel to the outflow line.

Abstract: The machine includes a piston which is cylindrical in the mathematical sense, which has an axis .DELTA..sub.p, which is rotary, and which is situated in a cylindrical casing that has an axis .DELTA..sub.c, the piston having an outline that has .DELTA..sub.p axes of symmetry, the casing delimiting a hollow volume whose cross-section in a plane perpendicular to its axis .DELTA..sub.c has S.sub.c axes of symmetry, S.sub.p and S.sub.c differing from each other by unity. The axes .DELTA..sub.p and .DELTA..sub.c are parallel and are separated by a distance E, the piston and the casing delimiting at least three chambers between them, and the casing including at least one suction inlet and one delivery outlet. The positive-displacement machine further includes a ferromagnetic sprocket which has an axis .DELTA..sub.p, which is secured to the piston, which has N.sub.p teeth, and which is disposed inside a ferromagnetic toothed ring which has an axis .DELTA..sub.

Abstract: An axial multi-piston compressor having a drive shaft which rotates and a cylinder block having a multiplicity of cylinder bores and pistons within the cylinder bores. The cylinder block is associated with a crank chamber containing the fluid to be compressed and a lubricating oil mist. The peripheral wall of the crank chamber having a groove on the peripheral surface which groove collects oil and directs the oil to the shaft seal. The groove is partially curved in a direction counter to the direction of rotation of the shaft.

Abstract: A piston type compressor has a plurality of cylinder bores in which a plurality of pistons reciprocate to effect suction, compression and discharge of refrigerant gas in response to rotation of a drive shaft. The compressor has a gas receiving chamber for receiving the refrigerant gas before compression, a discharge chamber for receiving the compressed gas, and at least one rotary valve mounted on the drive shaft to be rotatable with the drive shaft. The rotary valve has a suction passageway for providing fluid communication between the gas receiving chamber and each of the compression chambers formed in the cylinder bores. A groove is provided on the outer circumferential wall of the rotary valve. The groove is connected with the outlet of the suction passageway and extends to a vicinity of the opposing end portions along the outer circumferential wall.

Abstract: A swash plate type compressor comprises a cylinder block having formed therein a compartment accommodating therein a swash plate and a plurality of axial cylinder bores each receiving therein a reciprocally movable double-headed piston. The compressor further comprises a drive shaft having formed therein a discharge passage in communication with front and rear discharge chambers in front and rear housings, respectively, which are fastened to the axial ends of the cylinder block. The drive shaft is supported by a pair of front and rear tapered roller bearings and these two bearings are arranged in such a way that at least part of refrigerant gas discharged into either one of the discharge chambers flows through both of the front and rear bearings so that the bearings are lubricated by oil contained in and entrained by the refrigerant gas.

Abstract: A double diaphragm pump operated by selectively switching pressurized air into either of two diaphragm chambers; the air actuator valve is a cup valve which is slidable over orifices in a valve plate, and actuable by air pistons; the air pistons are coupled via passageways to a pilot valve which is a second cup valve slidable over orifices in a valve plate, the cup valve being actuable by pins extending into the diaphragm chambers and into contact with diaphragm members at predetermined positions.

Abstract: The air valve on a reciprocating pneumatic pump bleeds air from the pressurized air chamber into the exhaust port through a hole in the valve cup in order to warm the exhaust port area and prevent ice build up in the area. Such construction is also suited for use in spool valves.

Abstract: A cross-fire tube for use in connecting adjacent combustors in industrial gas turbines includes a relatively flexible main spring body portion (12,50, 68, 76) extending between two end portions, each end portion including a connector (22, 26, 54, 72, 90) adapted to engage a collar portion of one of the respective combustors. Each of the connectors includes a plurality of spring loaded fingers adapted to engage at least an inside surface of a respective collar portion. When secured in place between adjacent combustor liner covers, the cross-fire tube is in axial compression. The main spring body may comprise a saw cut spring tube (12), a coil spring (52) covered by a wire reinforced ceramic fabric (66), a corrugated wire mesh fabric (70) heat treated to impart spring characteristics thereto; or a bellows type tube (76).

Abstract: A portable compressed air system includes a housing, and a diesel engine having a predetermined torsional inertia, a predetermined cranking speed, and a predetermined idle speed. A centrifugal compressor is flexibly coupled in motive force receiving relation to the diesel engine. The flexible coupling has a predetermined spring rate which places the torsional interia of the compressor above a highest predetermined cranking speed and below the predetermined idle speed of the diesel engine. A microprocessor-based electronic controller controls compressor operation. A receiver stores compressed air. A cooling means cools the portable compressed air system. The cooling means has a fan, an intercooler, an oil cooler, an engine radiator, and an aftercooler. The intercooler, the oil cooler, the radiator, and the aftercooler are arranged in two banks, and each bank is defined by two cooling cores juxtaposed one to each other.

Abstract: A modular fluid end assembly, and associated method of providing same, for a reciprocating pump having a cylinder housing secured to a crankcase by tie bolts. The fluid end is tolerant to having cylinder-head bolts improperly torqued while also providing an over pressure relief feature. The modular fluid end includes a cylinder-head having two seal landings, one common to a cylinder base joint surface and one common to an end joint surface. The base joint seal landing is smaller than the end joint seal landing. An end plate and a co-acting valve cover is provided. The valve cover includes a seal extending thereabout and is accommodated by the seal landing of the end joint. A second seal is accommodated by the base joint seal landing. A plurality of cylinder-head bolts having predetermined yield strengths, are located in proximity to the periphery of the end plate to force the end plate and the valve cover against the cylinder-head.

Abstract: An envelope follower is provided which reduces defect propagation when reading analog information signals from a read head of, for example, an optical drive or a magneto-resistive tape drive. In a preferred embodiment, the envelope follower includes a differential amplifier, to sense the difference between the amplitude of the information signal and an envelope voltage across a capacitor, and a current mirror, responsive to the differential amplifier, to charge the capacitor at a predetermined rate when the amplitude of the information signal exceeds the envelope voltage. When the amplitude of the information signal is below the envelope voltage, the current mirror is deactivated by the differential amplifier and the capacitor is allowed to discharge through a voltage divider.

Abstract: The centrifugal pump unit has a split tube motor in the form of a single phase induction motor with at least one power winding and a starting winding accommodated in a split tube casing. For the purpose of unblocking the rotor, a rectifier element is provided, which is able to be connected in parallel or in series with at least a part of a starter or power winding. The average torque produced by the motor when in its unjamming phase is always in the same direction, so that the pump will commence rotating in the correct direction when unjammed. The rectifier element may be connected in every time the pump unit is started, possibly for a predetermined time, or may alternatively be connected in only when jamming occurs.

Abstract: An improved technique is disclosed for a combustion-based power generation system that includes a combustion chamber having an exhaust, a source of input air for the combustion chamber, a source of fuel for the combustion chamber, and a turbine and generator communicating with the combustion chamber for obtaining power from the combustion. The method includes the steps of: heating and humidifying the input air; sensing a condition of the heated and humidified input air, and generating a control signal in response to the sensed condition; and cooling the heated and humidified input air before it is input to the combustion chamber. Humidified input air that is at too high a temperature, or which is not saturated, is sensed, and appropriate trim cooling is provided to obtain the desired condition for the humidified input air. In this manner, maximum humidification is achieved while avoiding overheating and maintaining operating temperature in a desired range.

Abstract: A method for controlling a hydraulic pump driven by an engine, including measuring a temperature of at least one of the engine and a hydraulic fluid, comparing the measured temperature with a first predetermined temperature to judge as to whether the measured temperature is higher than the first predetermined temperature or not, comparing the measured temperature with a second predetermined temperature to calculate a difference between the measured temperature and the second predetermined temperature, and decreasing an output flow rate of the hydraulic pump by a degree according to the difference between the measured temperature and the second predetermined temperature, when the measured temperature is judged to be higher than the first predetermined temperature.

Abstract: A fluid compressor comprises a rotary member, a cylinder, and a closed casing for receiving the rotary member and cylinder. The rotary member and cylinder are relatively turned so that a fluid is drawn into work chambers through a suction port, successively compressed and conveyed toward a discharge port through the work chambers, and discharged outside. The fluid compressor is provided with a control valve means. When pressure in the work chambers exceeds a predetermined value during the compressing process, the control valve releases the pressure through a discharge or suction end of the cylinder, or to the inside of the casing.

Abstract: A wet niche light having a nonconductive forming shell 14 with a nonconductive housing 16 mounted therein. A double ended lamp is fixed within the housing in sockets which do not retain the lamp in friction engagement but rather hold the lamp by axial compression. A conductive reflector extends over the sockets and is grounded externally. A planar lens having vertical ribs is positioned within a bezel that attaches to the forward side of the housing by means of resilient clips. The nonconductive forming shell includes a conductive ring about the front opening of the shell with a conductor extending rearwardly for coupling with a pool grounding net. The lamp is positioned far enough within the housing such that no direct light from the lamp will strike the surface of the water in the pool at less than the critical angle of total reflection.

Abstract: A sense amplifier circuit having a pair of complementary inputs and a pair of complementary outputs with voltage swing limiter and cross-coupled feedback to tail devices. The sense amplifier circuit comprises first differential amplifier for receiving the pair of complementary inputs to generate first output of the pair of complementary outputs. The first differential amplifier is coupled to a first current source device for biasing. The circuit also comprises second differential amplifier for receiving the pair of complementary inputs to generate second output of the pair of complementary outputs. The second differential amplifier is coupled to a second current source device for biasing. A voltage swing limiter is coupled to the pair of complementary outputs of the first and second differential amplifiers for limiting the voltage swing of the pair of complementary outputs. A feedback circuit is coupled to feed the outputs back to drive the other tail device.