Abstract: A hydraulic pump includes a casing, and an impeller pump having a rotor that is rotationally mobile with respect to the casing about a first axis. The rotor includes several blades in helix form, a transition zone belonging to the casing and having, on the side of the impeller pump, a ramp in helix form developing in the same direction as the helix form of the blades. A trochoid pump includes a rotor with outer toothing secured to the rotor of the impeller pump. A rotor with internal toothing is rotationally mobile with respect to the casing about a second axis parallel to and offset from the first axis. The trochoid pump is fed by the impeller pump through the transition zone running along the ramp.

Abstract: A submersible well fluid system for operating submerged in a body of water may include an electric machine and a fluid end. The electric machine includes a rotor and a stator residing in a first housing at specified conditions. The fluid end may include an impeller and be coupled to the electric machine. The submersible well fluid system may also include an adjustable speed drive for the electric machine in the housing. The submersible well fluid system may also include a chemical distribution system for supplying treatment chemicals to the submersible well fluid system, a barrier fluid supply system for supplying a barrier fluid to the submersible well fluid system, and a pressure management system.

Abstract: A motor-driven compressor includes an electric motor, a compression mechanism driven by the electric motor so as to compress refrigerant gas, a metal housing accommodating the electric motor and the compression mechanism, a suction passage communicable with interior of the housing wherein refrigerant gas flows through the suction passage, a discharge passage communicable with the interior of the housing wherein refrigerant gas discharged from the compression mechanism flows through the discharge passage and a check valve that is provided in at least one of the suction passage and the discharge passage, opened while the compressor is in operation and closed while the compressor is at a stop.

Abstract: A three-way solenoid valve includes a valve box in which a first valve seat and an outflow port are provided at one end and a second valve seat is provided at an apart position. A solenoid unit, provided with the valve body, is located at the other end of the valve box. A circular sealing projection divides the internal space of the valve box into a first chamber and a second chamber. A first inflow port is open in the first chamber, and a second inflow port is open in the second chamber. The first inflow port communicates with the outflow port when the valve body is in contact with the second valve seat. The second inflow port communicates with the outflow port through an internal flow path when the valve body is in contact with the first valve seat.

Abstract: A discharge valve system of a scroll compressor comprises: a fixed scroll having a discharge hole and discharge bypass holes; a discharge valve assembly mounted at the fixed scroll, for opening and closing the discharge hole by a pressure difference; and an integral bypass valve assembly mounted at the fixed scroll, for opening and closing the bypass holes and interworking the discharge valve assembly. According to this, a discharge amount of gas is maximized in a low pressure ration driving of the scroll compressor thereby to enhance a discharge efficiency. Also, the number of components is greatly reduced thus to reduce a fabrication cost. Also, the number of assembly processes is greatly reduced thereby to enhance an assembly productivity.

Abstract: A pump head for a fluid pump driven by a motor includes an inlet for receiving fluid at a first pressure and an outlet for outputting fluid at a second pressure greater than the first pressure. A relief valve cavity formed in the pump head housing includes a first portion in fluid communication with the inlet and a second portion in fluid communication with the outlet. A relief valve is disposed in the relief valve cavity with no portion of the relief positioned to block or otherwise impede the normal flow of fluid through the inlet or outlet.

Abstract: A drink dispensing system having sets of faucet dispensers, ice storage bins adjacent to the sets of faucet dispensers, respectively, a common carbonator and circulation pumps associated with fluid circuits provide circulating flow through cold plates defining bottoms to the ice storage bins. Flow may be in parallel or in series to each of the separate stations. The circulating system is illustrated to be for the carbonated water supply while noncirculating supply systems provide noncarbonated water and syrup to the dispensing stations. Circulating systems for bar guns using a cold plate is also disclosed.

Abstract: A first bypass valve (27) that sets discharge capacity to 60% is provided in a first scroll 21 of an asymmetrical spiral-type scroll compressor. Also, a second bypass valve (40) that makes suction side and discharge side communicated with each other so that set load of the compressor becomes 50% is provided outside a scroll of the first scroll (21). In this way, by closing the first and second bypass valves (27, 40), effective load of the compressor is set to 100%. Also, by opening the first bypass valve (27) and concurrently closing the second bypass valve (40), the effective load of the compressor is set to 60%. Further, by opening both the first and second bypass valves (27, 40), the effective load of the compressor is set to 30%.

Abstract: Normally closed valve structure is located in a fluid path between the suction and discharge sides of a compressor. The valve structure opens upon a small pressure differential when the higher pressure is in the normal suction side which is indicative of reverse operation. Additionally, relief valve structure opens when the discharge pressure becomes excessive.

Abstract: A surge prevention control system for use with a dynamic compressor provides a multiple module controller for operating an anti-surge valve to bypass flow around the dynamic compressor. The multiple module controller includes a PID control module and a rate control module. The PID control module controls the anti-surge valve to control the operating point of the dynamic compressor about the surge control line. The rate control module uses the rate of approach of the operating point to the surge control line as its process variable. In the event of high rate of approach, the rate control module takes control of the anti-surge valve. The setpoint of the rate control module is adjusted to open the anti-surge valve to control the rate of approach to the surge control line to minimize the overshoot of the PID control.

Abstract: A booster compressor system modulates discharge pressure with a proportional regulator in fluid communication between the compressor discharge and a servo control for a valve to the compressor inlet. The servo control comprises a double acting piston connected to a valve control rod. In one embodiment, the proportional regulator is of a negative signal type and communicates to a side of the piston for urging the piston to a valve opening position. A valve closing pressure is applied by a non-relieving regulator in fluid communication between the compressor discharge and the other side of the servo control piston. As the discharge pressure increases, the proportional regulator out let pressure decreases thereby resulting in the servo control allowing the intake valve to the compressor inlet to close. This, in turn, reduces the compressor discharge pressure thereby resulting in the proportional regulator controlling the valve to partially open once more.

Abstract: An electric motor driven radial piston pump for a motor vehicle brake system with slip control is disclosed wherein the radial piston pump includes two parallel working circuits drivable by the drive motor. The working pressure of the first working circuit is limited to a preset value. Above the preset value only the second working circuit is effective.

Abstract: In a rotary compressor, a relief valve for providing refrigerant at suction gas pressure to the discharg port when the rotary compressor is operated in the reverse rotation direction. The relief valve includes in the preferred embodiment a passage for providing a source of refrigerant at suction pressure, a pressure responsive relief valve, and a passage for providing refrigerant at suction pressure from the relief valve to the discharge port. When the compressor system is operated in the correct rotation, refrigerant at discharge pressure maintains the relief valve in the closed position, preventing flow from the discharge port to the suction pressure source. When the compressor system is operated in the reverse rotation however, the pressure in the discharge port is reduced to below that of the refrigerant in the suction pressure source, whereupon the releif valve opens permitting flow from the suction pressure source to the discharge port.

Abstract: A drain fitting has a vessel formed with a laterally open housing outlet, at least one inlet, and an internal seat at the outlet. A pump is provided in the vessel and has a pump housing secured to the seat and having a pump output extending into the outlet and a pump intake, an impeller displaceable to move liquid through the housing from the intake to the output, and a motor in the housing driving the impeller. A check valve is provided in the pump output for preventing liquid flow back into the pump housing as well as means releasably securing the pump on the seat in the vessel. The pump housing is substantially closed and has its intake substantially lower than its output so that it acts as a gas trap.

Abstract: A multi-compressor system comprising first and second stage motor-compressor units, a low pressure line for transmitting vapor from a source thereof to the first stage unit, an intermediate pressure line for transmitting vapor between the first and second stage units, a high pressure line for transmitting vapor from the second stage unit, and a bypass line for transmitting vapor from the low pressure line to the intermediate pressure line to selectively bypass the first stage unit. The first stage unit includes a first supply of lubricant, a first compressor, and a first lubricant overflow passage for passing overflow lubricant from the first supply thereof into the first compressor. The second stage unit includes a second supply of lubricant, a second compressor, and a second lubricant overflow passage for passing overflow lubricant from the second supply thereof into the second compressor.

Abstract: The control system is utilized in a high pressure liquid spraying system including an internal combustion engine, a pump driven by the engine, a source of liquid connected to the pump and a spray nozzle assembly connected by a high pressure conduit to the output of the pump. The control system includes an enclosure and a valve assembly mounted near the pump. The valve assembly is operated by an electric switch mounted on the nozzle assembly and connected to a first solenoid valve in a hydraulic system for operating the valve assembly. The valve assembly includes a hydraulic cylinder which is mounted on the enclosure and which has a plunger positioned to open a ball valve of the valve assembly which is mounted within the enclosure and which is connected to the output of the pump.