Abstract: A hydraulic system includes a first hydraulic device to be operated by an operation fluid, a second hydraulic device, the second hydraulic device being configured to be operated by the operation fluid, a first control valve to control the first hydraulic device, a second control valve disposed on a downstream side of the first control valve and configured to control the second hydraulic device, a communication tube connecting the first hydraulic device to the first control valve, the communication tube being configured to supply a return fluid that returns from the first hydraulic device to the first control valve, a supply fluid tube connecting the first control valve to the second control valve and being configured to supply the return fluid to the second control valve, and a connection fluid tube disposed on the first control valve, the connection fluid tube connecting the communication tube to the supply fluid tube.

Abstract: A heat pump system for a vehicle includes an integrated control valve, an external condenser connected to the integrated control valve through first and second connection lines, an expansion valve connected to the integrated control valve through a third connection line, an evaporator connected to the expansion valve, an accumulator connected to the evaporator, a compressor connected to the accumulator, an internal condenser connected to the compressor and connected to the integrated control valve through a fourth connection line, a first chiller disposed on a fifth connection line connecting the integrated control valve and the accumulator, a sixth connection line connecting the fifth connection line and the integrated control valve between the first chiller and the accumulator, and a second chiller provided on a seventh connection line connecting a refrigerant line and the integrated control valve between the evaporator and the accumulator.

Abstract: Working system for an application of force onto a workpiece, with a pneumatic actuator having an actuator housing designed to be fixed to a manipulator and a moveable element designed to couple an end effector and movably received on the actuator housing, and with a controller having a valve arrangement for a compressed air supply to the pneumatic actuator, has a position sensor system for determining a spatial position of the pneumatic actuator and for providing position-dependent electrical position sensor signals, and a processing system for processing the position sensor signals and for providing control signals to the valve arrangement, the processing system being designed for controlling a pneumatic supply to the pneumatic actuator as a function of the position sensor signals.

Abstract: A control valve includes a housing formed with first and second supply ports, first and second actuator ports, and a pilot port, and a spool accommodated slidably in the housing, and the spool is configured to allow the first supply port and the pilot port to communicate with each other both at the first communication position and the second communication position.

Abstract: Controller for controlling a bleed valve including a first body with an internal cavity connected to an air inlet port and an air outlet port, a second body including a chamber, a mobile member in the cavity and in the chamber, connecting the two bodies. The member is mobile between a position whereby the ports fluidly communicate and a position whereby the ports are isolated, the member further including two pistons housed in the chamber and defining in this chamber at least two spaces. The controller also includes a fluid supply for at least one of the spaces for the purpose of moving the pistons in the chamber.

Abstract: A hydraulic drive unit includes: a pump; a pair of supply-discharge lines; a valve block; a sealed tank; a suction line that leads hydraulic oil in the sealed tank to the pump; a connecting line that connects an air vent port of the pump to the suction line; and a gas-liquid separator that separates air and the hydraulic oil flowing through the connecting line from each other. The pump is disposed upward of the valve block and the sealed tank in a vertical direction.

Abstract: An electromagnetic valve device having a fluid inlet port (1), which is formed in a valve casing (10), for a fluid to be switched, in particular pneumatic fluid, a working port (2), which is realized in the valve casing, for the fluid and locking component(s) (14), which are moveably guided in the valve casing along an axial direction and which are realized for interacting with a valve seat (26) formed in the valve casing and opening a fluid flow path between the fluid inlet port and the working port and which are moveably realized via fluid switched by means of electromagnetic positioning means (32).

Abstract: A single piece expansion plug and method of using the same in connection with a tool is provided. The plug has an inner recess extending partially into a top of the plug, the inner recess defining a tapered inner wall. The plug is installed with a tool having a tapered end at a greater angle with respect to the taper inner wall. The tool presses against the tapered inner wall to expand the plug against a hole. The tool includes a pin that retracts against a spring to seat the plug in the hole to be sealed such that the pin contacts the plug prior to the tapered inner wall and tapered end coming into contact.

Abstract: A hydraulic actuator comprises a chamber, a first line, a second line, and an auxiliary line. The chamber allows fluid to move therethrough and comprises a movable element therein. The first line is in fluid communication with the chamber. The second line is in fluid communication with the chamber. The auxiliary line connects the first line and the second line and comprises a valve to selectively allow fluid communication between the first line and the second line as the movable element is moved in the chamber.

Abstract: A poppet valve includes an inlet port, a first outlet port, a second outlet port, a first exhaust port, a second exhaust port, and a spindle. A first poppet element and a second poppet element each float relative to the spindle. A first piston and a second piston are fixed relative to the spindle. The spindle moves from an initial centered closed position to a first actuated position or a second actuated position to direct air flowing from the inlet port to the first outlet port or the second outlet port, respectively. The initial centered closed position is located between the first actuated position and the second actuated position. A housing contains the spindle, the first poppet element, the second poppet element, the first piston and the second piston.

Abstract: A motion conversion device including a body, a first double-acting cylinder movable along a first axis and a second double-acting cylinder movable along a second axis angled relative to the first axis. The body includes several bores which form a closed circuit and house the first and second double-acting cylinders. Movement of the first double-acting cylinder along the first axis hydraulically or pneumatically pushes the second double-acting cylinder along the second axis. Also disclosed is a valve incorporating a motion conversion device with angled double-acting cylinders for moving a closure member between an open position and a closed position, and a method for opening and closing a valve by way of angled double-acting cylinders.

Abstract: A hydraulic valve assembly includes an inlet; an outlet; a pressure compensator upstream of the inlet; and a pressure limited flow priority boost valve spool movable between a first position and a second position and comprising an outer spool body and an inner spool body. The outer spool body includes deadhead meter notches disposed such that, in the first position, the spool closes fluid communication between the inlet and the pressure compensator, and such that, in the second position, the spool opens fluid communication between the inlet and the pressure compensator. The inner spool body is movable relative to the outer spool body and is configured to open fluid communication between the inlet and the outlet so as to bypass the compensator. The flow between the inlet and the compensator is a reduced pilot flow.

Abstract: A hydraulic control device includes: a recovery oil passage; a regenerative motor that rotates an output shaft of an engine in response to a supply of the hydraulic fluid and is driven to rotate by rotation of the output shaft of the engine; a regenerative oil passage for guiding return oil from a boom cylinder to the regenerative motor without passing the return oil through the recovery oil passage; a coupling oil passage that couples the recovery oil passage and the regenerative oil passage to each other; and a regeneration-side check valve that is provided on the coupling oil passage, and allows the hydraulic fluid to flow from the recovery oil passage toward the regenerative motor, and moreover restricts the hydraulic fluid from flowing from the regenerative motor toward the recovery oil passage.

Abstract: A change-over valve comprises a spool housed in a spool housing, and a pilot chamber facing at least an end of the spool. An axial passage is formed in the spool along the axial direction. While being connected to a pilot chamber, the axial passage communicates with a tank passage via a small hole having an opening on an outer periphery of the spool in accordance with displacement of the spool, to discharge the air in the pilot chamber to the tank passage. Since the axial passage is formed at a location offset from a center axis of the spool, a length of the small hole is shortened and the small hole is easily processed.

Abstract: A system has an actuator having a rotor or a linear piston, and ports for hydraulic fluid, an electro-mechanical sensor sensing position of the rotor or linear piston, a valve having a 1 plug in a bore of a valve body, the plug having cross bores aligning with passages within the valve body communicating inlet and outlet ports depending on relative position of the plug in the bore of the valve body, a servo motor to move the plug around or along the axis to different positions to align individual ones of the cross bores with individual ones of the passages communicating with individual ones of the ports, and a programmable controller coupled to the electro-mechanical sensor and to the servo motor, the controller enabled to control the servo motor to accomplish programmed movement and position of the rotor or linear piston of the hydraulically-driven actuator.

Abstract: Disclosed is a battery relay for a vehicle. The battery relay has a strengthened operation structure, which includes divided upper plunger and lower plunger by dualizing an internal plunger and induces shocks of the upper plunger and the lower plunger upon initial movement of the lower plunger thereby minimizing the amount of arc generated upon contact and improving durability by shortening a switching time between a movable contact and a fixed contact.

Abstract: A multi-port servo valve includes a valve plug within a valve body bore, where the plug has multiple holes radially positioned at different axial positions, and the bore has multiple ports, where the valve plug may be controlled to (i) align a first set of plug holes with a first set of bore ports to a first open position, (ii) align a second set of plug holes with a second set of bore ports to a second open position, and (iii) preclude alignment of the plug holes with the bore ports to a valve closed position. The system also includes a servo motor configured to control the position of the valve plug within the bore, and a programmable controller in electrical communication with the servo motor and a sensor associated with the hydraulic cylinder for automated operation.

Abstract: A valve manifold includes a valve body carrying pairs of laterally spaced piston actuated valves controlled by control modules operative to selectively pressurize and exhaust an outlet port connected to a fluid device and configured in groupings permitting varying valve functionalities.

Abstract: A hydraulic trip unit for a valve unit in a prime mover plant is described, with monitoring passages which are grouped together in a hydraulic block and interconnected forming a 2 out of 3 circuit, of which each monitoring passage is provided with a solenoid valve unit, with a power oil line connection which is provided on the hydraulic block and from which an emergency oil passage and an auxiliary emergency oil passage extend inside the hydraulic block, of which the emergency oil passage can be connected to the valve unit and the auxiliary emergency oil passage is connected via connecting lines to a solenoid valve unit in each case, wherein a first connecting line feeds a first and third solenoid valve unit, a second connecting line feeds the second and a first solenoid valve unit, and a third connecting line feeds the third and second solenoid valve unit.

Abstract: A pilot valve configured to provide a control pressure within a dynamic fluid system, the pilot valve comprising: (a) a valve body having a supply port, a return port, and a control pressure port, the pressure control port in fluid communication with a subsequent valving component; (b) an axial bore formed in the valve body and in fluid communication with each of the supply, return, and control pressure ports; (c) a valve spool slidably supported within the axial bore of the valve body, the valve spool configured to control fluid flow through the supply, return, and control pressure ports, and to vary the rate of change of area of at least one of the supply and return pressure ports upon being displaced, thereby providing a variable resistance to fluid flowing therethrough and reducing the quiescent power of the pilot valve; and (d) means for displacing, in a selective manner, the valve spool within the axial bore about the supply, return, and control pressure ports to apportion fluid therethrough to provide

Abstract: A valve system for activating a piston of a piston-cylinder arrangement for a hydraulic or fluid device includes a pilot control valve including 3/2-way valve and a main valve arrangement having a first and a second main valve. The first and second main valves include 2/2-way valves, wherein in a first position the pilot-control valve is configured to move the first main valve into an open position so as to direct a path for a high pressure fluid to a space above the piston, and wherein in a second position the pilot-control valve is configured to connect the space to a low-pressure tank so as to relieve a pressure in the space above the piston via the second main valve, and wherein the pilot-control valve is configured to open the second main valve and configured to close the first main valve.

Abstract: A valve assembly includes a valve housing defining a service passage, a first bore in fluid communication with the service passage, a first passage, a second bore in communication with the service passage and a second passage. The first bore has an inlet portion, a first service portion in communication with the service passage, and a first load holding portion. The first passage is in communication with the first load holding portion and the service passage. The second bore has a return portion, a second service portion in fluid communication with the first service passage, and a second load holding portion. The second passage is in selective communication with the second load holding portion of the second bore and the return passage. A valve is disposed in the second passage. The valve allows fluid to flow only in a direction from the second load holding portion to the return passage.

Abstract: A softstart valve means comprises a main valve member which is only switched over after a certain time from a closed position into an open position. The opening force required for switch over of the main valve member can be produced selectively in a manner dependent from pressure obtaining in a secondary duct or in a time dependent fashion. The respective operational mode can be selected by actuation of switch over means.

Abstract: The present invention describes, generally, a method and system for controlling the dynamics of an actuatable load functioning or operable within a servo or servo-type system, wherein the dynamics of the load are controlled by way of a unique asymmetric pressure control valve configured to provide intrinsic pressure regulation. The asymmetric pressure control valve, which may be referred to as a dynamic pressure regulator because of its capabilities, utilizes different sized free floating spools that are physically independent of one another and freely supported in interior cavities of respective corresponding different sized valving components that make up the valve body to regulate the pressures acting within the overall system between the control or pilot pressure and the load or load pressure.

Abstract: A lift axle control module is disclosed that is simpler than prior art lift axle control systems, and does not require cycling the input pressure to the regulator. The module includes a housing fluidly connected to a first pressurized air supply and having one chamber with a load bladder port, a second chamber with a lift bladder port, and a common vent port. A pilot pressure is selectively provided for switching the module between the retracted and deployed modes. When the control module is set to the retracted mode, the lift bladders are pressurized to the system pressure, and the load bladders are vented. When the control module is set to the deployed mode, the lift bladders are vented and the load bladders are inflated and maintained at the regulated pressure.

Abstract: A solenoid actuated valve assembly includes a valve body having a slidable main valve member and a pilot valve body mechanically connected to the valve body including a slidable pilot valve member. A first solenoid operated valve connected to the pilot valve body when energized directs pressurized fluid to move the pilot valve member between pilot valve open and closed positions. A second solenoid operated valve connected to the valve body when simultaneously energized with the first valve directs the fluid to move the main valve member between valve closed and open positions. A third solenoid operated valve connected to the pilot valve body when energized and when both the first and second solenoid operated valves are de-energized directs the fluid to move the pilot valve to the pilot valve open position and the main valve member to the valve closed position.

Abstract: A hydraulic trip unit for a valve unit in a prime mover plant is described, with monitoring passages which are grouped together in a hydraulic block and interconnected forming a 2 out of 3 circuit, of which each monitoring passage is provided with a solenoid valve unit, with a power oil line connection which is provided on the hydraulic block and from which an emergency oil passage and an auxiliary emergency oil passage extend inside the hydraulic block, of which the emergency oil passage can be connected to the valve unit and the auxiliary emergency oil passage is connected via connecting lines to a solenoid valve unit in each case, wherein a first connecting line feeds a first and third solenoid valve unit, a second connecting line feeds the second and a first solenoid valve unit, and a third connecting line feeds the third and second solenoid valve unit.

Abstract: The present invention relates to a switching valve device used for vacuum suction of a member such as a semiconductor chip, and the object thereof is to break a vacuum rapidly and smoothly. The switching valve device includes a vacuum suction switching valve function for vacuum suction, a vacuum break switching valve function for vacuum break, and an open-to-atmosphere switching valve function which in conjunction with an operation of the vacuum suction switching valve function, opens a passage to the atmosphere side when the vacuum suction switching valve function is off and closes the passage to the atmosphere side when the vacuum suction switching valve function is on. The vacuum suction switching valve function, the vacuum break switching valve function, and the open-to-atmosphere switching valve function are integrally incorporated into a body portion.

Abstract: A lift axle control module is disclosed that is simpler than prior art lift axle control systems, and does not require cycling the input pressure to the regulator. The module includes a housing fluidly connected to a first pressurized air supply and having one chamber with a load bladder port, a second chamber with a lift bladder port, and a common vent port. A pilot pressure is selectively provided for switching the module between the retracted and deployed modes. When the control module is set to the retracted mode, the lift bladders are pressurized to the system pressure, and the load bladders are vented. When the control module is set to the deployed mode, the lift bladders are vented and the load bladders are inflated and maintained at the regulated pressure.

Abstract: The valve includes a body having five surfaces and a plurality of blind holes, grooves and channels interconnected with the blind holes to form communication net. Two rectangular diaphragms are embedded separately into the grooves so as to selectively open and close the blind holes. An internal sliding base with an external sliding base coupled to the external periphery thereof and comprises a sliding section and an internal press pillar disposed separately on two corresponding ends of the bottom of the sliding section. The two internal press pillars are capable of selectively opening and closing the two diaphragms. The external sliding base includes an external press pillar disposed separately on both corresponding ends of the concave groove. A casing for covering the external periphery of the external sliding base is secured with the body. At least one elastic member is installed between the top surface of the casing and the external sliding base.

Abstract: The object of the present invention is to provide a three-way valve reduced in the number of component parts and man-hours for assembling the component parts. A pressure chamber of a piston for urging a first main valve in a valve-closing direction by a spring, and a pressure chamber of a piston for urging a second main valve in a valve-opening direction against the urging force of a spring are connected to a medium-pressure port B via a pilot valve and a pressure passage. When the pilot valve is open, the pressure in the pressure chambers into which high-pressure fluid is introduced from a high-pressure port A via an orifice is permitted to escape to the medium-pressure port B, whereby the piston is pushed upward by the high pressure to open the first main valve, and a plug is urged by the spring to close the second main valve.

Abstract: An integrated three function valve (ITFV) that combines the functions of a bypass valve (e.g. 183a, 185a, 161a) into a single assembly is disclosed. The ITFV allows continued operation after any two failures.

Abstract: The object of the present invention is to provide a three-way valve reduced in the number of component parts and man-hours for assembling the component parts. A pressure chamber of a piston for urging a first main valve in a valve-closing direction by a spring, and a pressure chamber of a piston for urging a second main valve in a valve-opening direction against the urging force of a spring are connected to a medium-pressure port B via a pilot valve and a pressure passage. When the pilot valve is open, the pressure in the pressure chambers into which high-pressure fluid is introduced from a high-pressure port A via an orifice is permitted to escape to the medium-pressure port B, whereby the piston is pushed upward by the high pressure to open the first main valve, and a plug is urged by the spring to close the second main valve.

Abstract: A control device for a hydraulic control motor includes at least one valve controlled actively by an actuating force and at least one passive valve which is operatively connected to the actively controlled valve and which is co-controlled via a line.

Abstract: The present invention provides a construction machine with a structure of pilot pipe comprising detection ports for detecting pilot pressure in a body of a switching valve, so that the number of pipe connecting positions and pipe assembly parts such as joints and the like can be decreased and arrangement of the pipe can be simplified.

Abstract: A working cylinder (A) having at least one working chamber (6, 7) defined by the cylinder barrel (1), at least one of the end sections (2, 3) and a piston (4), at least one supply port (9a, 9b) and a exhaust port (12a, 12b) for the working medium. The exhaust port (12a, 12b) has a valve (13a, 13b) that may be regulated by the pressure of the working medium, which is applied at the supply port (9a, 9b) in order to obtain a smaller dimension of at least the valve and to better utilize the already existing space, specifically within the cylinder, and to better and more efficiently adjust the output capacity of the individual elements. A valve (V), particularly a switch valve (W) of a rocker valve design has therefore at least one inlet (16) and at least one outlet (17a, 17b) for the working medium, as wells as at least one control port (18).

Abstract: A valve for controlling flowing media, in particular suction air used in connection with suction heads or the like, in which closing diaphragms (17, 18) made from elastically deformable material are disposed within a valve housing (10) and are subjected to the action of compressed air via actuating lines (14, 15) in the closing or blocking direction, such that when each diaphragm (17, 18) moves into an open position, a subatmospheric pressure is generated on the side ling opposite the closing side.

Abstract: An electrohydraulic valve pilot stage for controlling differential pressure is disclosed. The electrohydraulic valve pilot stage has a housing for protecting the valve; a first and second inlet capable of connection to fluid supplies; a first nozzle and a second nozzle fluidly connected to the inlets; a baseplate attached to the housing and the nozzles; a restraining member attached to the baseplate at a position between the first nozzle and the second nozzle; a pivot pin; a flapper restrained by the restraining member and having a first end and a second end, the flapper pivotably mounted on the pivot pin; and a null adjust pin mounted in a pivot pin contact capable position for adjusting the position of the ends of the flapper relative to the nozzles.

Abstract: The present invention provides a construction machine with a structure of pilot pipe comprising detection ports for detecting pilot pressure in a body of a switching valve, so that the number of pipe connecting positions and pipe assembly parts such as joints and the like can be decreased and arrangement of the pipe can be simplified.

Abstract: The present invention is a pressure feedback circuit for use with a vacuum pressure control circuit. The pressure feedback circuit detects the occurrence of, and controls the generation of vacuum pressure under, External Override Conditions (“EOCs”). During EOCs, which typically include emergency stop conditions or loss of electrical power to the vacuum pressure circuit, the pressure feedback circuit senses the condition of the output vacuum pressure port and supplies feedback to the vacuum pressure control circuit thereby maintaining the last output state of the vacuum pressure control circuit.

Abstract: It is an object of the present invention to provide a control valve which can reduce the number of external lines connected to a hydraulic remote control valve. A control valve 1 for controlling hydraulic cylinders 2,2′ is provided, in one 26 of spool covers, with fluid passages 27,27′, a shuttle valve 28 for selecting higher one of pilot pressures to be transmitted to these fluid passages 27,27′, and a fluid passage 29 for transmitting the pressure selected by the shuttle valve 28. The fluid passages 27,27′ are in communication with pressure fluid ports 25,25′ as connection ports for pilot lines 24a,24c. The control valve 1 is also provided, in the other spool cover 32, with fluid passages 33,33′, a shuttle valve 34 for selecting higher one of pilot pressures to be transmitted to these fluid passages 33,33′, and a fluid passage 35 for transmitting the pressure selected by the shuttle valve 34.

Abstract: A module comprises a pilot valve and four switching valves, in particular for driving actuators, the pilot valve being a 4/3-way valve.

Abstract: In a check valve assembly and a valve assembly employing such a check valve assembly, a topping piston may be taken into contact with a main poppet to raise the main poppet from its seat. The main poppet is designed without significant area difference from the valve seat and the topping piston is actuated through a pilot valve, so that the process of raising the main poppet from the valve seat is controllable.

Abstract: An on/off valve (O/OV) and directional valves (DV1, DV2) are packaged with a switching valve system (10) in a housing assembly (156, 157, 158, 160). The on/off valve (O/OV) is operated by a control handle (154) that is located at one end of the housing assembly (156, 157, 158, 160). The direction control valves (DV1, DV2) are operated by a handle (141) located at the opposite end of the housing assembly (156, 157, 158, 160). The control handles (154, 141) operate to position cams (152, 136, 138) which function to help position valve plugs. In a second embodiment, the handle (141) and cams (136, 138) for controlling the directional valves (DV1, DV2) are replaced by a solenoid valve system (SV2). A second solenoid valve (SV1) is added to the control system for the off/on valve (O/OV). The solenoid valve (SV1, SV2) allow for a remote positioning of the controls for the off/on and directional valves (O/OV, DV1, DV2).

Abstract: A valve assembly for actuation of a user and a method for actuation of the valve assembly, wherein a supply throttle device and a drain throttle device may be actuated independent of each other, is disclosed. In the case of single-action users, the drain throttle device is actuated such that the open cross-section of the drain throttle is maximum upon attaining the desired volumetric flow of hydraulic oil, so that the energy losses in the drain conduit are reduced to minimum.

Abstract: A directional control valve system is provided in conjunction with a hydraulic actuator, using a meter-in flow control valve that is simple in structure to permit pressure fluid to be fed into a first and a second chamber of the hydraulic actuator. The directional control valve system includes a meter-in flow control valve 1 for establishing and blocking fluid communication of a pump port with an outlet port 12, a first and a second load checking valve 2 and 3 that is in fluid communication with the outlet port 12, and a meter-out flow control valve 4 for establishing fluid communication of one of a first and a second actuator port 72 and 74 at an output side of the first and second load checking valves 2 and 3 with a tank port 71, and has an arrangement that permits the first and second load checking valves 2 and 3 to be held in a closed state with pressure fluid.

Abstract: A three-way valve for controlling the application of air to a pneumatically controllable device has a pressure chamber for pressurizing a work chamber to which the device is connectable and an exhaust chamber for expelling air from the work chamber. Unidirectional flow means prevents air in the work chamber from entering the space behind a valve member controlling the flow of air from the pressure chamber to the work chamber for avoiding valve lockup.