Abstract: A dual pump fault tolerant fuel delivery system for providing a metered fuel flow to an aircraft gas turbine engine, combines a fixed displacement pump with a demand control pump operating at a speed commanded by an electronic engine control such that the electronic engine control can provide the metered fuel flow by controlling the speed of the demand control pump and the area of a metering valve to reduce the temperature of the fuel in comparison to fuel systems employing a fixed displacement pump, a pressure regulating valve and a bypass fuel flow system.

Abstract: A reciprocating type fluid delivery pump has a driving motor, plungers for driving two pump heads, respectively, and a converting mechanism for converting the rotational motion of the driving motor into a reciprocating motion of each plunger. The converting mechanism includes a cam having such a configuration that, when the driving motor is rotated at constant velocity, the delivery flow rate during the delivery starting period of each of the plungers is in excess of that during the other periods of the cycle. The speed of rotation of the driving motor is reduced during the excess delivery period according to need. Thus, the load on the driving motor is reduced and it is therefore possible to employ a driving motor having a relatively low output. The delivery pump also includes a rinsing chamber for each plunger for allowing pressurized fluid to pass therethrough. The rinse chamber includes a rinse pump which uses the reciprocal movement of the pump piston for the rinse mechanism.

Abstract: A system for metering the volume of a liquid, e.g. ink, supplied by a positive displacement pump to an installation, such as a printing press, employs a device for generating a first series of signals each indicative of completion of a pumping stroke. The speed of the pump is also sensed to generate a second series of signals each indicative of the positive supply of liquid by the pump. The signals of the first series are counted only in the presence of a corresponding signal of the second series. The result is an accurate numerical indication of the total volume of liquid pumped.

Abstract: An outdoor unit has at least two variable-capability compressors and has an outdoor heat exchanger coupled to the compressors having lubricating oil supplying sections coupled together by an oil-balancing member. A plurality of indoor units are each coupled to the outdoor unit for forming a refrigerating cycle and each have at least an indoor heat exchanger and an output section for outputting demand capability data according to an air conditioning load of the indoor heat exchanger. In accordance with the demand capability data, a controller generates a parallel operation command for parallel operation involving both of the compressors of the outdoor unit with capability according to a sum of the demand capability data from the indoor units.

Abstract: A hydraulic pressure supply system includes a discharge rate variable fluid pump. The discharge rate of the fluid pump is controlled to vary depending upon the vehicle driving condition. In the control of the discharge rate of the fluid pump, greater discharge rate is ordered while the vehicle is running, than that during vehicle stopping condition.

Abstract: A T-fitting for use with pipes of different diameter sizes includes a generally T-shaped hollow body defining a central flow transition passageway, and three spaced-apart pipe-connecting hollow ends formed on the body in flow communication with its central flow transition passageway. A pair of the pipe-connecting ends share a common axis and are disposed in opposing relation on the body. Each of the pair of pipe-connecting ends has a pair of tandemly-arranged outer and inner pipe-receiving sections defining respective outer and inner passageways in flow communication with the central passageway. The outer passageway is larger in diameter than the inner passageway, and the respective outer and inner sections have outer and inner shoulders with respective outwardly-facing internal surfaces adapted to abut with ends of pipes of different size diameters when received in the respective passageways.

Abstract: A pumping system for producing uniform discharge and suction rates includes a pump connected to a supply of hydraulic fluid to deliver hydraulic control fluid at a selectable flow rate to a proportioning valve. The proportioning valve divides the flow of hydraulic fluid into two resulting flows, each of which is utilized via a four-way valve to drive a piston within a hydraulic cylinder. The positions of the pistons within the cylinders are detected and used to control the proportioning valve such that each piston is imparted with a velocity that varies in a sinusoidal manner in response to the hydraulic fluid delivered to it by the porportioning valve. Sensing of the piston positions and control of the proportioning valve may be accomplished mechanically by a system of cams driven by the pistons, or electronically by a microprocessor receiving signals from transducers coupled to the pistons.

Abstract: A sump pump assembly having a primary sump pump and a secondary sump pump and including a T-fitting for connecting together the outlets of the primary sump pump and the secondary sump pump to a common exhaust. The T-fitting contains a one-way valve on the secondary pump outlet connection and a fastening means for a water level sensing device.

Abstract: A water-powered positive displacement auxiliary sump pump has a drive water inlet connected to the municipal water supply via a float actuated pilot valve. The pump is designed to be constructed chiefly of molded plastic supported by an exit manifold connected to the discharge line of an existing electrical sump pump. The presently preferred design is a rotary sliding vane pump having drive water and pump water chambers.

Abstract: A redundant system for use in an aircraft instrument system of the type including a first pump adapted to be driven by an aircraft engine. At least one instrument is operably connected to the first pump. The redundant system includes a second pump selectively operably connected to the electrical power source of the aircraft and to the instrument. A switch is adapted to be connected to an air line connecting the instrument and the first pump, the switch being operable to provide an electrical connection between the second pump and the electrical power source in response to a change in pressure in the air line connecting the instrument and the first pump.

Abstract: An improved load balancing control circuit for at least three electric motor-driven centrifugal refrigerant compressors comprises a current transformer secondary 90', 91', 92' and a respective load resistor 93', 95', 97' in series to form the legs of a circuit in which the legs are connected in a delta, each leg having a shorting switch 110', 111', 112' connected across it, and a balancing resistance network including balancing resistors 94', 96', 98' are connected in a wye circuit with the delta circuit.

Abstract: A centrifugal fan provided with dampers is driven by a motor having a speed control circuit. Air flow from the centrifugal fan is controlled from a point of maximum air flow to a predetermined crossover speed only by changing the velocity of the fan impeller with subsequent air flow control at air flow rates below said crossover speed being attained only by adjustment of the fan dampers.

Abstract: A device is described and shown for supplying tandem line fluid systems, the device comprising pumping means driven by an electric motor and a slide valve for alternately supplying the pressure fluid to either of the two lines, wherein the pump slide valve is controlled by using as the above motor a reversibly rotating type of electric motor, transmitting torque in one direction for controlling through a one-way drive clutch the pump, and in the other direction the slide valve through a second one-way drive clutch transmitting the torque in the opposite direction.

Abstract: Portable air compressor system for a respirator and adapted to be operated from a source of power. A plurality of compressors are provided. Each compressor has a fan for causing air to move over the compressor and has an outlet supplying compressed air. A cooling coil is provided having an inlet and an outlet and is positioned so that the fans of the compressors force air over the cooling coil. Piping connects the outlets of the compressors to the inlet of the cooling coil. A water trap is provided. Piping connects the outlet of the cooling coil to the water trap. An air reservoir is provided which has an inlet that connects it to the water trap and an outlet which is adapted to be connected to the respirator. A pressure regulator is provided which is in communication with the reservoir. A pressure switch is provided which is connected to the regulator and at least one of the compressors for halting operation of said at least one compressor when a predetermined pressure is reached in the reservoir.

Abstract: A blood pumping system has a pair of integral flexible bodies each provided with an inlet and an outlet and disposed in open top cavities in a housing. The cavities have extensions holding inlet valves and outlet valves for opening and closing the inlets and outlets. A flexible diaphragm overlies the cavities and their extensions and is secured by a cover providing separate chambers over the inlet valves, the outlet valves and the bodies. Solenoid air valves are selectively energized to supply and exhaust the chambers to operate the valves and bodies. Switches responsive to the full and empty positions of the bodies govern the energization of the solenoids through control circuitry including a voltage controlled oscillator, a device for changing the frequency of the oscillator in accordance with the time of operation of at least some of the switches, and a device for ensuring at least a minimum rate of operation of the switches.

Abstract: In the recovery of natural gas liquids by partial condensation, flashing, and compression, minimum and maximum temperature control of partially condensed feed stream hydrocarbons to a product separator is imposed by a minimum temperature control system which provides the same set point to the pressure controllers on the compressor suction scrubbers for both the product and the flashed vapor produced from the liquid outlet of the product separator with one of the two output signals responsive to the pressure of the product suction scrubber or the flashed vapor suction scrubber manipulating, by way of a selective relay, the engine speed controller of the dual compressor unit taking suction from the two scrubbers; and a maximum temperature controller which controls the rate of by-pass of natural gas feed around the partial condensation-separation system unless, by means of a selective relay, compressor availability is a more limiting criterion.