Abstract: A device for processing of a liquid that includes a device-input for receiving the liquid to be processed at an input-pressure, a device-output for returning the processed liquid at an output-pressure, a process chamber having a chamber-inlet and a chamber-outlet with the chamber-inlet being connected to the device-input via a feed-line, and the chamber-outlet being connected to the device-output via a discharge-line. The feed-line includes a pump for increasing the pressure of the liquid from the input-pressure to a feed-pressure at the chamber-inlet, and the discharge-line includes a back-pressure mechanism adapted to maintain a discharge-pressure at the chamber-outlet upstream of the back-pressure mechanism at an excess-pressure above the output-pressure, and to reduce the pressure of the liquid from the discharge-pressure to the output-pressure downstream of the back-pressure mechanism. The pump in the feed-line is a first stage of a multiple-stage gear pump.

Abstract: A valve arrangement is configured to rectify a volumetric flow supplied by a hydraulic pump to a first pump connection or second pump connection. The valve arrangement includes a first suction valve arranged between a suction-side connection of the valve arrangement and the first pump connection. The valve arrangement also includes a second suction valve arranged between the suction-side connection and the second pump connection. The valve arrangement also includes a first pressure valve arranged between a pumping-side connection of the valve arrangement and the second pump connection. The valve arrangement also includes a second pressure valve arranged between the pump-side connection and the first pump connection. The first suction valve is acted on by the pressure of the second pump connection in the opening direction. The second suction valve is acted on by the pressure of the first pump connection in the opening direction.

Abstract: Pump, in particular a servo steering pump for motor vehicles, having a flow control valve and a valve sleeve which has inflow openings to the flow control valve and a pressure connection to a hydraulic load.

Abstract: When a pressure of fuel supplied to an engine is higher than a target, the fuel is carried in a reverse direction by rotating a fuel pump in reverse, and in accordance therewith, the fuel pressure is made to fall with good responsiveness.

Abstract: For a purpose of realizing a refrigerant cycle apparatus capable of exactly detecting a pressure reverse phenomenon caused in a compression element of a compressor of a multistage compression type, in the refrigerant cycle apparatus in which the multistage compression type compressor constitutes a refrigerant circuit, including an electromotive element, and first and second compression elements driven by the electromotive element in an airtight container to suck an intermediate-pressure refrigerant gas compressed by the first compression element into the second compression element and to compress and discharge the refrigerant gas, the apparatus comprising: a sensor for detecting a discharge refrigerant pressure of the first compression element; and a control device into which an output of the sensor is input, the control device detects reverse of the discharge refrigerant pressures of the first and second compression elements based on the discharge refrigerant pressure of the first compression element.

Abstract: Devices and methods for liquid fuel reverse purge on shutdown of turbines are provided. The device and method may utilize a liquid fuel reverse purge control system that includes an induction motor associated with a pump, together with fuel system solenoid valves, an electronic control unit and associated software logic. The device and method may alternative utilize a liquid fuel valve manifold including an assembly for mechanical reverse purging of liquid fuel from the atomizer fuel manifold and supply lines thereto, optionally together with an assembly for controlling the flow of the reverse-purged fuel through a re-circulation circuit used to preheat fuel prior to system start-up under cold conditions.

Abstract: A three-way-valve is actuated by fluid which moves membranes.

Abstract: Protective apparatus in a scroll compressor, in the form of a valve assembly, is operative to prevent compressor damage from reverse direction rotation of the scroll compression mechanism or the development of abnormally high discharge gas temperatures. The valve assembly is disposed in a passage communicating between the suction and discharge pressure portions of the compressor shell and houses a discharge temperature sensor immediately adjacent the location from which discharge gas issues from the compression mechanism. The location of the sensor and its exposure to discharge gas permits the timely sensing of abnormally high discharge temperatures and the shutdown of the compressor upon their occurrence.

Abstract: The continuous removal of solid products from a high-pressure system is achieved by operating a high-pressure pump in reverse to gradually reduce pressure at the exit line to atmospheric pressure. This process allows solid products to exit the system while at the same time maintaining high pressure in the reactor.

Abstract: An automotive control system for hydrostatic pumps includes a hydraulic circuit with an automotive orifice located upstream of the main hydrostatic loop with replenishing check valves and downstream of the fill pump. The location of the automotive orifice upstream of the check valves isolates system leakage from affecting flow to the automotive orifice. A hydrostatic unit displacement control valve has a drain side connected to the hydraulic circuit downstream of the fill pump and in parallel with the automotive orifice, and has a supply side connected downstream of the automotive control orifice. The input logic of the control valve is reversed to compensate for the greater pressure available to the drain side of the control valve as compared to the supply side. Reversing the input logic of the control valve provides servo control pressures without the need to isolate the control supply from the hydrostatic loop supply.

Abstract: An improved pump for providing pressurized fluid to a pressurized fluid operating device for opening and closing a door comprising having a pump housing with a pump chamber therein; a rotatable pumping element within the pump chamber; a pair of passages adapted for connection to a pressurized fluid operating device extending from the pump chamber to the exterior of the pump housing; means for driving the pump element in rotation; and a pair of pressure responsive bypass valves. The pump element is adapted to deliver pressurized fluid to either one of the pair of passages as determined by the sense of rotation of the pump element, with the other passage receiving the exhaust flow of pressurized fluid. Each of the pressure responsive bypass valves is connected to a different one of the pair of passages in the pump housing and is adapted to bypass pressurized fluid at a predetermined pressure setting.

Abstract: A low side scroll compressor is protected from both the potentially damaging effects of improper electrical hookup and the development of high discharge temperatures by the disposition of a valve member in a passage which communicates between the suction pressure portion and a discharge pressure portion of the compressor. The valve operates to permit the flow of gas from the suction to the discharge pressure portion of the compressor through a protective passage when the compressor is caused to run backwards due to miswiring so as to avert damage to the scroll members. The valve permits the flow of gas from the discharge to the suction pressure portion of the compressor through the protective passage when the temperature of the discharge gas produced by the compressor is caused to exceed a predetermined temperature. The resulting flow causes the compressor motor to de-energize.

Abstract: An improved pump for providing pressurized fluid to a pressurized fluid operating device for opening and closing a door comprising having a pump housing with a pump chamber therein; a rotatable pumping element within the pump chamber; a pair of passages adapted for connection to a pressurized fluid operating device extending from the pump chamber to the exterior of the pump housing; means for driving the pump element in rotation; and a pair of pressure responsive bypass valves. The pump element is adapted to deliver pressurized fluid to either one of the pair of passages as determined by the sense of rotation of the pump element, with the other passage receiving the exhaust flow of pressurized fluid. Each of the pressure responsive bypass valves is connected to a different one of the pair of passages in the pump housing and is adapted to bypass pressurized fluid at a predetermined pressure setting.

Abstract: A system for detecting when the pressure on a bi-directional hydraulic device, such as a motor or a pump, exceeds a predetermined pressure. The device is of the type having two meshing gears mounted to rotate in a housing. Fluid inlet and outlet ports are located in the housing on opposite sides of the meshing gear teeth. A pilot port is located in the housing to detect the fluid pressure between one gear and the housing at a location isolated from the inlet and outlet ports. The sensed pressure is a function of the maximum pressure at the inlet and outlet ports.

Abstract: A rotary pump for pumping liquids is provided. The pump is compact with a bypass system built into the pump housing. The pump is symmetrical about a center line so it can pump liquids in opposite directions simply by reversing the rotation of the drive shaft and without making any changes in the pump itself. The bypass also is designed to open equally with liquids flowing in either direction. The pump has self-lubricating vanes or blades which are designed so that the liquid being pumped can move behind the blades and urge them outwardly against the pump chamber wall, with the liquid also helping to lubricate the blades. The pump also has improved mechanical seals and bearings for the drive shaft.

Abstract: An axially shiftable slide valve member in a rotary, helical screw compressor carries a port which senses the pressure of the working fluid in the trapped volume just before uncovering of the closed thread to the discharge port and compares that pressure with the line pressure at the discharge port and shifts the slide valve member to balance the pressures and prevent overcompression or undercompression of the compressor. The screw compressor may be provided with two identical but oppositely oriented slide valve members on opposite sides of the intermeshed helical screws with one slide valve member controlling the capacity of the compressor and the other balancing the closed thread pressure at discharge with discharge line pressure. Compressor rotation may be reversed to eliminate the need for a reversing valve where the compressor operates in heat pump or reverse flow defrost refrigeration applications, with the two slide valves trading functions.