Abstract: An injection assembly, for pressure die casting systems, has an injection cylinder adapted to inject liquid metal into a casting cavity; the injection cylinder is actuated by a hydraulic flow of an oil-pressure controlled circuit; the oil-pressure controlled circuit includes a hydraulic cushion which blocks and releases the flow of the hydraulic fluid in the injection cylinder and provides a counter-pressure of preset value to control the injection speeds and to prevent cavitation in the injection cylinder.

Abstract: A system for operating and/or lubricating a plurality of valves mounted on a number of christmas trees, each valve including a hydraulic actuator operated by hydraulic pressure from a hydraulic pressure source and a lubricant inlet connected to an interior portion of the valve. The system includes a plurality of control units, each of which is associated with a respective valve and each of which has at least one of a hydraulic pressure line which is connectable to the hydraulic pressure source and a lubricant line which is connectable to the lubricant source. Each control unit is operable to selectively connect the hydraulic pressure source to the hydraulic actuator to thereby operate the valve and/or to selectively connect the lubricant source to the lubricant inlet to thereby communicate lubricant into the interior portion of the valve.

Abstract: A valve actuator for a valve is disclosed, including an actuator housing with a reciprocation axis and a piston configured to reciprocate within the actuator housing along the reciprocation axis. The actuator housing has a port and a chamber disposed between the piston and a portion of the actuator housing with the port for fluid communication with the port of a working fluid. A piston projection or piston recess in the chamber is moveable with the piston to reduce a flow area in the chamber that causes a reduction in speed of the piston prior to reaching a stop position.

Abstract: The disclosed apparatus may include a fluidic channel connecting an inlet port and an outlet port. The apparatus may further include a gate transmission element configured to limit fluid flow between the inlet port and the outlet port. Still further, the apparatus may include a primary gate terminal connected to a second fluidic inlet port, where pressure or force at the primary gate may at least partially control movement of the gate transmission element. The apparatus may also include a secondary gate terminal connected to the second fluidic inlet port. Pressure or force at the secondary gate may at least partially control movement of the gate transmission element. Various other associated methods, systems, and computer-readable media are also disclosed.

Abstract: A method and system having a water-flush toilet having a toilet bowl that is in fluid communication with a water source and is mounted with a sensor. The sensor includes a transmitter to transmit an ultrasonic signal and a receiver to receive an ultrasonic signal. The sensor may measure a Time of Flight (ToF) of the signal to obtain a ToF measurement. A microcontroller is electrically connected to the sensor and may receive and process the ToF measurement using an algorithm to determine a bowl status. The toilet also includes at least one water valve that is disposed between the bowl and the water source, and that is electrically connected to the microcontroller for instructing the at least one water valve to move from a first position to a second position for a duration of time, wherein the duration of time corresponds to the bowl status.

Abstract: A filling system includes a filling valve including an outlet opening and a sealing member movable relative between an outlet closing position, an outlet fully open position and at least one outlet partially open position. A linear actuator operatively connected to move the sealing member, the linear actuator including a first member movable between an extend position and a retract position, and a second member movable between an extend position, a first retract position and a second retract position. The first retract position of the second member is defined by contact with a distal portion of the first movable member when the first movable member is in its extend position and the second retract position of the second member is defined by contact with the distal portion of the first member when the first member is in its retract position.

Abstract: A system for operating and/or lubricating a plurality of valves which are mounted on a number of christmas trees and which each include a hydraulic actuator which is operated by hydraulic pressure from a hydraulic pressure source and a lubricant inlet which is connected to an interior portion of the valve that is configured to receive a lubricant from a lubricant source. The system includes a plurality of control units, each of which is associated with a respective valve and each of which has at least one of a hydraulic pressure line which is connectable to the hydraulic pressure source and a lubricant line which is connectable to the lubricant source. Each control unit is operable to selectively connect the hydraulic pressure source to the hydraulic actuator to thereby operate the valve and/or to selectively connect the lubricant source to the lubricant inlet to thereby communicate lubricant into the interior portion of the valve.

Abstract: A solenoid operated unit (100) for detecting and removing an undesired fluid (6) from a desired fluid (5) with diagnostic metering, comprises a unified solenoid operated pump and valve unit (70), a drainage path (40), an electrical detection system (60), a mecha-electro-magnetic detection system (80) and a junction box (190) interacting with an electronic control unit (90) comprising a PWM generator. A plunger (50) moves from up to down, a sweeping volume (28) with a cycle of a PWM electricity wave, while moving down the plunger (50) creates a negative pressure in a sweeping volume (28) and while moving up a positive pressure gets created in the sweeping volume (28) and a negative pressure gets created at a rear end (30) of a unified chamber (26), an air reliever (180) is provided for breathing.

Abstract: Disclosed is a water stop valve. A water inlet channel, a water outlet channel, and a water sealing surface are formed in a valve body. A valve stem has a middle portion movably disposed in the valve body and a lower portion mounted in a back-pressure hole of a water-plugging stopper. A back-pressure cavity is formed above the water-plugging stopper. A sealing end surface matching the back-pressure hole is formed on the valve stem. When in use, the valve stem drives the water plugging stopper to move downwards, the sealing end surface blocks the back-pressure hole, and the water plugging stopper blocks the water sealing surface, such that the water enters the back-pressure cavity, and the water pressure enables the water-plugging stopper to block the water sealing surface to stop the water. The water stop valve stops a water inlet valve from feeding in water in a timely manner.

Abstract: A pilot valve assembly (10) includes a cylindrical connector (12) having a first end portion (16) with external threading (18) for engaging a threaded control socket (106) of a hydraulic valve (100), and a second end (20) with an array of teeth (22) arrayed around its edge. A circumferential slot (24) around connector (12) is spaced from second end (20). The assembly also includes a pilot valve (26) with a mechanism for controlling a pressure within the hydraulic control valve actuator chamber. Pilot valve (26) is formed with a recess (28) having a complementary teeth (30) for engaging teeth (22) of connector (12) in a range of angular orientations. A clamping arrangement engages slot (24) and clamps pilot valve (26) to second end (20) of connector (12), thereby fixing an angular orientation of the pilot valve.

Abstract: A valve device for liquids, especially for liquid plastic constituents of single- or multiple-constituent plastic mixtures, includes a valve housing with a liquid inlet and a metering valve, which has a discharge opening that can be closed by a closure element, a pressure control device acting on the liquid in the liquid inlet and comprising a control membrane which acts on the closure element. A shut-off diaphragm separates the pressure control device from the liquid inlet, and the pressure control device comprises a fluid-tight control chamber which is at least partially arranged in the valve housing, for storing a substantially incompressible fluid. A pressure generating device allows the control membrane to be subjected to pressure by the incompressible fluid arranged in the control chamber.

Abstract: An assembly installable in an air conditioning and/or heating system of a room including a body (7) having an inlet opening (7a), an outlet opening (7z) and a channel (70) providing fluid communication between the inlet and outlet openings (7a, 7z). An orifice in the body (7) and shaped such that when a flow runs through the channel (70) between the inlet opening (7a) and the outlet opening (7z), a pressure difference is generated between the first region (7p) and the second region (7s) within the body (7), the first region (7p) being located upstream of the orifice, the second region (7s) downstream of the orifice. The assembly includes a meter (1) for detecting the pressure difference and a variator of at least one geometric feature of the orifice, the variator being able to arrange the orifice in different configurations, each corresponding to a respective geometric feature of the orifice.

Abstract: System and method for a lock valve for a hydraulic actuator. The lock valve includes a valve housing coupled to the hydraulic actuator. The valve housing defines a chamber in selective fluid communication with a hydraulic circuit. The lock valve includes a valve body received within the chamber and responsive to the hydraulic circuit to move to an unlock position in which the lock valve is unlocked. The valve body includes a rod having a first end and an opposite second end. The valve body includes a head coupled to the rod between the first end and the second end. The head is responsive to the hydraulic circuit to move the valve body to the unlock position, and in the unlock position, the first end of the rod extends outwardly from the valve housing to visually indicate the lock valve is unlocked.

Abstract: A pressure regulator has a pressure chamber connected to an inlet flow area which receives liquid flow. As liquid flows into a forward chamber of the pressure chamber, pressure is exerted on the forward face of the piston, which in turn causes the piston to slide longitudinally through the pressure chamber. A bypass fluidically connects the forward pressure chamber and rear pressure chamber such that as the piston slides into the rear pressure chamber pressure increases at the rear pressure chamber, which in turn forces the piston to move forwardly, thus regulating flow out of the pressure chamber. A hand wheel is configured to turn a movable plate located inside the pressure chamber, with the movable plate configured to impede the piston from moving rearwardly. Pressure sensors and vents with a pressurized air source may be used to keep the pressure within a desired range.

Abstract: A system includes a flow control assembly having a first portion configured to be positioned within and coupled to a first passageway formed in a wellhead component and a second portion configured to be coupled to a second passageway formed in a body that is configured to be coupled to the wellhead component. An actuator of the second portion is configured to drive a valve member of the first portion into an open position to enable fluid flow across the flow control assembly.

Abstract: A valve includes a basic body, control spool, sealing ring, and control cover. The control spool is received in the basic body to be movable along a longitudinal axis. The basic body includes a counter-sealing surface, connecting channel, and tank channel having at least one first annular groove surrounding the control spool. The control cover and at least one end face of the control spool facing toward the longitudinal axis delimits, at least in part, a control space. The control cover includes a sealing surface that abuts the counter-sealing surface of the basic body. At least one of the sealing surface and the counter-sealing surface includes a sealing groove that surrounds the control space in ring-like fashion. The sealing ring is received in the sealing groove. The connecting channel opens out into the tank channel and into the sealing groove.

Abstract: A balancing valve spool and a pressure regulating valve including the balancing valve spool. The balancing valve spool includes a valve rod having a first end and a second end. The valve rod defines a longitudinal axis that extends between the first end and the second end. The balancing valve spool also includes a piston sleeve fixed to the valve rod between the first end and the second end. The balancing spool valve further includes a fixing member arranged between the valve rod and the piston sleeve. The fixing member extends in a direction parallel to the longitudinal axis of the valve rod. Connecting the fixing piece to an actuator of the valve and arranging the fixing piece between the valve rod and the piston sleeve along the axial direction of the valve rod, guides the valve rod and simultaneously isolates inlet pressure and outlet pressure.

Abstract: A flush toilet apparatus for discharging waste by a jet pump action is disclosed. The flush toilet apparatus has an overflow portion configured to overflow a portion of flush water flowing from a throat pipe into a water conduit into a reservoir tank so that when the flow rate of water flowing inside the throat pipe exceeds a predetermined specified flow rate, the flow rate of water supplied from the water conduit to a bowl portion is reduced to less than a predetermined specified flow rate.

Abstract: A valve for a fuel cell serves to discharge a fluid in a fuel cell system to the outside or other locations of the fuel cell system. The valve is mounted with a pressure transmission unit which is connected between a valve flow path unit having an inner flow path for moving a fluid and a solenoid unit for generating power for opening and closing the inner flow path of the valve flow path unit, and transmits pressure between the valve flow path unit and the solenoid unit, so as to minimize an operating load of the solenoid unit by minimizing a pressure difference between the valve flow path unit and the solenoid unit, regardless of factors such as working pressure and a temperature in the fuel cell system.

Abstract: A valve assembly includes a valve body having a valve body central axis. A valve actuator is operably connected to the valve body and is located such that a central axis of the valve actuator is nonparallel to the valve body central axis. A strut extends from the valve body to the valve actuator to support the valve actuator in a fixed relationship to the valve body. A pneumatically-actuated butterfly valve includes a valve body having a valve body central axis and a valve disc. A pneumatic actuator is located such that its central axis is nonparallel to the valve body central axis. The actuator includes a piston disposed in a cylinder, the piston operably connected to the valve disc. A strut extends from the valve body to support the actuator in a fixed relationship to the valve body.

Abstract: A system, including a flow control system, including a valve, a first cylinder including a piston coupled to the valve, wherein the piston moves axially within the first cylinder to transition the valve between open and closed positions, a magnetorheological (MR) fluid within the first cylinder configured to axially move the piston, and an MR fluid device configured to magnetize the MR fluid to control axial movement of the piston.

Abstract: A diaphragm valve for a vehicle includes: a diaphragm chamber having an upper chamber and a lower chamber divided by a diaphragm and communicating with a valve inlet and a valve outlet. The upper chamber has a nipple in which a fluid flows or from which a fluid is discharged, and the lower chamber has a chamber opening port at a lower end thereof. A valve rod is coupled to the diaphragm and extends toward the valve outlet. A valve head is provided at a position corresponding to an end of the valve rod and has a wider cross sectional area than the valve rod. The valve head closes the valve outlet when the valve is closed, and closes the chamber opening port when the valve is open.

Abstract: A pressure isolation device for a pipeline system is described. The pressure isolation device changes from an open position to a closed position when the pressure of a fluid flowing through the device exceeds a predetermined threshold pressure. In some embodiments, the predetermined threshold pressure is defined, in part, by a spring. The pressure isolation device provides a simple mechanical solution to protecting pipeline components from over-pressurization.

Abstract: A flow meter, and related system and method are provided. The flow meter includes a coupler, a support member, an image sensor, a valve, and one or more processors. The coupler is adapted to couple to a drip chamber. The support member is operatively coupled to the coupler. The image sensor has a field of view and is operatively coupled to the support member. The image sensor is positioned to view the drip chamber within the field of view. The one or more processors are operatively coupled to the image sensor to receive image data therefrom and to the actuator to actuate the valve. The one or more processors are configured to estimate a flow of fluid through the drip chamber and to actuate the valve to control the flow of fluid through the drip chamber to achieve a target flow rate.

Abstract: An activation device for a protection device includes: a body with a chamber that has, respectively at first and second ends, a medium inlet opening to a medium storage and a valve opening, and an outlet opening for discharging the medium into the protection device between the first and second ends; a valve for opening and closing the valve opening for passage of the medium; and a piston that (a) includes a passage along a main extension axis, from a first surface thereof adjacent to the medium inlet opening, to a second surface thereof, larger than the first surface and adjacent to the valve opening, and (b) is movable in the chamber by the medium and as a function of the control valve position between a position in which the at least one outlet opening is closed and a position in which the at least one outlet opening is opened.

Abstract: A poppet element of a valve is provided. The poppet element is movable relative to a valve seat of the valve and includes a balance chamber wall defining a balance chamber with a center body partially fixed relative to the valve seat, an upper head, a balance chamber holder having a coefficient of thermal expansion (CTE) that is matched with that of the upper head and a fastening element disposed to fasten the balance chamber holder to the upper head. The balance chamber holder is disposed between the center body and the balance chamber wall and configured to prevent thermal loading transfer from the balance chamber wall to the fastening element.

Abstract: A self-regulated valve assembly contains a valve body which, in the lower part, has an input section for a connection to a tank intended to contain a fluid under pressure and, in the upper part, an output for connection to a pipe system. A piston is movable in the valve body along a first axis between an open position, enabling the fluid to communicate between the input section and the output, and a closed position. A spring type module is coupled to the piston and to the valve body and interacts dynamically with the piston at least after an actuation of the valve and during the entire cycle of self-regulation of the valve, imposing a positioning of the piston between its open and closed position. The spring type module is positioned beneath the lower sealing section of the piston and the dimensions of the valve assembly can be considerably reduced.

Abstract: Methods and apparatus to assemble actuators are described. An example method includes positioning a biasing element in a cavity defined by a housing of an actuator such that the biasing element is in an uncompressed state and at least a portion of the biasing element is to extend outside of the cavity beyond an end defined by the housing; compressing the biasing element to a compressed state until the portion of the biasing element extending outside of the cavity is positioned inside the cavity; coupling a cover to the end of the housing to capture the biasing element in the cavity; and maintaining the biasing element in the compressed state during the coupling such that the biasing element does not engage the cover.

Abstract: A fluid control valve includes: a valve main body including an inlet port and an outlet port, each being formed on opposite side surfaces; and a mounting plate attached to a lower end of the valve main body; wherein the valve main body has side surfaces located perpendicular to the opposite side surfaces and formed with locking protrusions, the mounting plate is formed with locking arms each extending from an upper end of the mounting plate, the locking arms each having a locking pawl facing and engaging with the protrusion, the valve main body is formed with an annular rib about an central axis on the lower end of the valve main body, and the upper end of the mounting plate is formed with a press-fit rib including a press-fit portion press-fitted in a wall surface of the annular rib.

Abstract: This invention relates to a shut-off valve, and primarily to a valve for shutting-off the flow of a fluid such as a mains water supply to commercial premises or a domestic dwelling. The shut-off valve (10) comprises a diaphragm valve and a pilot valve (30). The diaphragm valve has an inlet (14) and an outlet (16), a valve member (26) and a valve seat (22), the valve member having a closed position in which it engages the seat and prevents the flow of fluid from the inlet to the outlet, and an open position in which the valve member does not engage the seat and fluid can flow from the inlet to the outlet. A first fluid conduit (36) connects the inlet of the diaphragm valve to the inlet of the pilot valve, and a second fluid conduit (40) connects the outlet of the pilot valve to the outlet of the diaphragm valve.

Abstract: An irrigation valve has a valve body with an inlet passage, an outlet passage, a valve seat intermediate the inlet passage and the outlet passage and a control chamber exit or bypass passage terminating in a surface that defines a portion of the outlet passage, the valve body including at least one of a recess and a rib for hindering clogging of the bypass passage. Related methods for hindering clogging of the control chamber or exit bypass passage are also disclosed.

Abstract: A pneumatic valve assembly with a trigger for switching the pneumatic valve assembly between two or more valve operation modes is disclosed herein. The valve operational modes are determined by selection of fluid conduits by a trigger valve assembly of the pneumatic valve assembly which interconnects fluid conduits to a main valve, pilot valves and a pneumatic cylinder of a fluid powered pole saw and wherein a piston located in the pneumatic cylinder is mechanically coupled to a cutting blade of the pole saw and the trigger is operatively coupled to the trigger valve assembly.

Abstract: The invention relates to a compressed-air device for controlling valves comprising, in a longitudinal direction, a first vane-type rotary cylinder (1) having a front face (2) as well as a back face (4), said front face (2) being provided with a rotatable head (3), and a second vane-type rotary cylinder (10) having a front face (11) and a back face, said first (1) and second (10) cylinders each being supplied with compressed air by means of a compressed air valve connected to two ports (7, 8; 14, 15) on each of said first and second cylinders.

Abstract: A composite valve has a communication path communicating a first valve chamber with a second valve chamber, a second valve port communicating the second valve chamber with an outflow port, and a pilot passage communicating a back pressure chamber with the outflow port. In the case that a lift amount of a second valve body for a small flow rate control is equal to or less than a predetermined amount, the pilot passage is closed by a pilot valve body, and a first valve port is closed by a first valve body, thereby taking a small flow rate control state. In the case that the lift amount of the second valve body goes beyond the predetermined amount, the pilot valve body is moved up in conjunction with the upward movement of a valve shaft so as to open the pilot passage, thereby taking a large flow rate control state.

Abstract: An actuator for actuating a plunger of a valve is provided. The actuator has an inlet and includes first and second hollow caps. A main actuation assembly is provided between the caps. The main actuation assembly includes a deformable diaphragm; first and second chambers, static sealing elements and a main piston movable between actuated and unactuated positions. A biasing mechanism biases the piston in the unactuated position. When pressurized gas is flown through the inlet and/or drawn from the outlet of the actuator, the first chamber expands, moving the main piston from the unactuated position to the actuated position, an actuating stem connected to the main piston thereby sliding within a channel provided in the bottom cap. Stackable actuating assemblies can also be used between the caps. Using static sealing elements advantageously avoids friction between moving parts.

Abstract: A pneumatic control valve includes a first valve body, a pushing block, a rotating block, a second valve body, an end cover, and a piston. The first valve body defines a first gas inlet and a receiving hole. The first valve body forms a plurality of guiding ribs evenly positioned on the inner surface of the receiving hole away from the first gas inlet, and each of the guiding ribs forms an inclined surface at a distal end thereof. The pushing block and the rotating block are slidably received in the receiving hole. The second valve body is connected to an end of the first valve body adjacent to the receiving hole of the first valve body. The end cover is fastened on an end of the second valve body away from the first valve body. A pneumatic control system using the pneumatic control valve is also provided.

Abstract: An electro-hydraulic system for driving a large-scale rotary motion valve supplied by a solar low-capacity power. A step motor (2) and an oil pump (3) are in turn driven by a low-capacity solar power supply (1). An oil tank (5), the oil pump, a check valve (6), a T-connector (7) and a liquid accumulator (10) are in turn arranged on an oil storage pipeline (4). An oil inlet pipeline (16) is connected to the rest of the ports of the T-connector. An oil inlet of a three-position four-way reversing solenoid valve (12) is connected to the oil inlet pipeline. Two ends of an oil return pipeline are connected to an oil return port of the reversing valve and an oil return port of the oil tank, respectively. Each of two oil outlets of the reversing valve is respectively connected to an oil port of a single-chamber cylinder via a pipeline. The outer ends of the piston rods of cylinders A and B are rigidly connected together to form one piston rod (134).

Abstract: Auxiliary valve controlled self-cleaning main valve with mechanical operating means. The valve body (1) of the main valve has an inlet (2) and an outlet (3) interconnected through a flow-through opening, and a movable piston (6) having a main closing element (8) at one of its sides and a brake O-ring (9) at its other side. In the control chamber (5) an auxiliary valve (4) with a control valve stem (7) is provided. Between the piston (6) and the auxiliary valve (4) a compressible spring (12) is positioned. The mechanical operating means is provided with a wedge travel path and adapted to press the control valve stem (7) when force is applied externally and to keep it pressed in without applying external force, further it is adapted to release it when force is applied externally and to keep it released without applying external force.

Abstract: A double action directional fluid flow valve includes a stepped piston connected with a poppet valve and moveable by a controller between open and closed positions by applying a continuous pressure to a small diameter piston face and selectively applying and removing pressure from a large diameter piston face to move the poppet valve between an open position and a closed position.

Abstract: A self-regulating valve controls the flow of high pressure gas discharging from a gas cylinder in a fire suppression system in response to a detection of a fire within a protected space by a two-step process which reduces the pressure rise within the protected space upon release of the fire suppression gas into the protected space.

Abstract: A valve assembly for sealing a port of a housing includes a primary sealing member and a secondary sealing member mounted to a valve body. Valve body includes a lower body with an upper portion depending from the body having a cross sectional diameter less than the upper body, and a lower portion depending from the upper portion having a cross sectional diameter less than the upper portion. The primary member includes apertures and is slidably mounted to the upper portion, and the secondary member is mounted to the lower portion. In a closed position the secondary member seals against the primary member, and the primary member seals against the port. Downward movement of the valve body unseals the secondary member from the primary member allowing venting through the apertures, and then unseals the primary sealing member from the port allowing full venting through the housing.

Abstract: A portable remote controlled fire-fighting valve has a central chamber in a main valve body, an inlet that connects to a hydrant, an outlet that connects to a fire hose, a valve mechanism that has a seating surface that seats against part of the device to open and close a flow channel through the central chamber, and a remote controller that enables an operator to selectively open and close the flow channel. The valve mechanism uses a piston that is mounted for axial movement within the central chamber. The piston has an annular wall that slides against an outer edge of a lateral chamber surface that is fixed in position within the main valve body. A spring biases the piston to the closed position. In the open position, water from the inlet flows around the piston, over its peripheral surface, to the outlet. A pressure chamber is formed between a lateral surface that is fixed in position within the valve body and a movable interior surface on the piston.

Abstract: In a method or device for operating a pneumatic drive system for actuating a control valve, a pneumatic working chamber is loaded with pneumatic pressure in order to move the control valve into a desired position.

Abstract: A hydraulic valve arrangement includes a manifold and a poppet. The manifold defines a bleed ring that surrounds a bore and has an angled surface. The manifold also defines an annular recess around the bleed ring that provides a relief region. The poppet is slidably disposed within the bore and is structured to close a main flow path between the first and second ports when the poppet is in a first position and the poppet being structured to at least partially open the main flow path when the poppet slides away from the first position. The poppet defines an angled contact surface that is configured to engage the angled contact surface of the bleed ring when the poppet is in the first position.

Abstract: According to one embodiment, a system and process for the equalization of pressures of a flow stream across one or more valves is provided. A process circuit having clean non-abrasive fluid and at least one slave cylinder for transmitting pressure to a process flow stream is employed.

Abstract: The microvalve device includes a pilot microvalve and a pilot operated spool valve. The pilot microvalve includes a pilot input orifice; a pilot output orifice, at least one of the pilot input orifice and the pilot output orifice having a cross-section flow area that changes as the pilot microvalve is actuated; and a passageway providing fluid communication between the pilot input orifice and the pilot output orifice. The pilot operated spool valve includes a spool having a surface in fluid communication with the passageway; a spool input port; and a spool output port, at least one of the spool input port and the spool output port having a cross-section flow area that changes as the spool is actuated. The spool valve is operable by the pilot microvalve such that a ratio of the cross-sectional flow area of the spool input port to the spool output port will substantially equal to a ratio of the cross-sectional flow area of the pilot input orifice to the pilot output orifice.

Abstract: A latch valve includes a first port containing line pressure, a second port containing control pressure, a third port located between the first and second ports, alternately connecting the first and second ports to a transmission control element, and a fourth port containing control pressure that tends to close the second port and open the first port in opposition to a spring force.

Abstract: A spool valve assembly includes a spool that is moveable by differential pressure across the spool.

Abstract: Exemplary embodiments are direct to a valve system for actuating the piston of a piston cylinder arrangement for a hydraulic or fluid device, and for actuating the piston cylinder arrangement for actuating the movable contact piece of a high-voltage circuit breaker. The system including a main control valve arrangement, having two 2/2-way valves used as main valves and which can be controlled by a pilot control valve arrangement. The main control valve arrangement directs a path for the high pressure fluid to the chamber above the piston and connects the chamber to a low-pressure tank for discharging the chamber above the piston. Two 2/2-way valves which form the pilot control valve arrangement are associated with the main control valve arrangement such that the 2/2-way valves direct or supply either a high-pressure control pressure or a low-pressure control pressure to the main control valve arrangement.

Abstract: Exemplary embodiments relate to a valve arrangement for actuating a piston cylinder arrangement, that includes a pilot control valve arrangement and a main control valve arrangement, wherein both the pilot control and main control valve arrangement include a 3/2-way valve as a pilot control valve and as a main control valve. Each valve has a control-pressure, high-pressure, and low-pressure connection. Said connections are connected to each other such that the main control valve is controlled via the control-pressure connection of the pilot control valve and the pressures on the control-pressure connection of the pilot control valve and the pressures on the control-pressure connection and on the high-pressure connection of both valves, are statically inverted relative to each other. The 3/2-way valves are designed as seat valves and are only hydraulically connected to each other.