Abstract: A control system for a vehicle having a dry dual clutch transmission (DCT) includes a launch condition detection module, a vehicle stop module, and a vehicle launch module. The launch condition detection module detects a launch condition based on whether (i) the vehicle is on an uphill grade and (ii) a driver of the vehicle has requested power via an accelerator. The vehicle stop module stops the vehicle when the launch condition is detected by (i) commanding an on-coming clutch of the dry DCT to a predetermined position and (ii) applying brakes of the vehicle. The vehicle launch module launches the vehicle after the vehicle is stopped by (i) fully engaging the on-coming clutch of the dry DCT and (ii) opening a throttle to a desired position corresponding to the power request.

Abstract: A spool type control valve, comprising: a valve block having a cylinder bore with drilled holes on the cylinder bore internal wall; a valve spool inserted in the cylinder bore; wherein the valve spool having separation sleeves each being spaced apart on the valve spool; wherein an all-metal-seal ring is assembled and fitted on each of the separation sleeves; and wherein each of the all-metal-seal rings is constructed with three different functioning ring layers: a cylinder seal layer, an absorption layer, and a shaft seal layer; wherein the cylinder seal layer seals the cylinder bore internal wall and does come into contact with the valve spool surface; wherein the absorption layer absorbs any dimensional variations during dynamic movement of the valve spool; and shaft seal layer seals the valve spool and does not come into contact with the cylinder bore internal wall.

Abstract: A regulator valve is structured such that hydraulic pressure to be output from a regulated pressure output port is regulated according to urging forces, i.e., line pressure to be regulated, throttle pressure, spring force from a compression coil spring, and operating force from a plunger, which are applied to a valve spool. The plunger has a small diameter portion and a large diameter portion having a diameter larger than the diameter of the small diameter portion, both of which are axially displaceably retained in a spring receiving sleeve. The small diameter portion is urged in one axial direction at one end of the plunger that protrudes into a spring chamber and faces the valve spool, while the large diameter portion is urged in the other axial direction by range pressure at the other end of the plunger which is isolated from the small diameter portion located in the spring chamber.

Abstract: A control valve (14) for a device (1) for modifying the control times of gas exchange valves (110, 111) of an internal combustion engine (100) is provided. A check valve is arranged inside an annular groove (44) which is formed on one of the components of the control valve (14) and through which a pressurized medium flows. This reduces the assembly costs.

Abstract: A hydraulic control valve with a main stage, having spool valves movable in a valve housing having at least four ports and provided with control edges formed on piston collars. A hydraulic pilot stage is provided to control the spool valve of the main stage, and is characterized by the fact that the spool valve of the main stage is designed hollow to form the hydraulic pilot stage. The wall of the hollow spool valve has at least one opening, to which a piston collar formed on the pilot valve is assigned with two control edges arranged on the outside, and in which the pilot valve penetrates a thrust plate inserted into the valve housing, enclosing the spool valve and creating a front pressure chamber for the spool valve to form a defined constant outflow path for the hydraulic fluid introduced into the annular space between spool and pilot valves.

Abstract: A spool is provided with a first discharge air duct connecting the first opening to the first discharge air chamber, and a second discharge air duct connecting the second opening to the second discharge air chamber, where the first discharge air duct and the second discharge air duct are divided by a non-duct part. A first output air pressure chamber is adjacent to a first discharge air chamber with a first diaphragm interposed therebetween, the first discharge air chamber is adjacent to a bias chamber with a second diaphragm interposed therebetween, the bias chamber is adjacent to an input air pressure chamber with a third diaphragm interposed therebetween, the input air pressure chamber is adjacent to a second discharge air chamber with a fourth diaphragm interposed therebetween, and the second discharge air chamber is adjacent to a second output air pressure chamber with a fifth diaphragm interposed therebetween.

Abstract: A valve part of a hydraulic control valve for controlling flows of pressurized medium is provided. The valve part includes: a cylindrical valve housing with a valve housing hollow space that is open on one side in the axial direction, wherein the valve housing is provided with a radial first work connection (A), a radial second work connection (B), and a radial pressure connection (P), each of which opens into the valve housing hollow space, and a cylindrical control piston is held in the valve housing hollow space so that it can move in the axial direction with a control piston hollow space that is open on one side at an axial control piston hollow space opening.

Abstract: A liquid flow rate control valve is provided in which since a total area of overlapping sections of a communication hole group (38c, 38d) of a distributor (38) and an outlet opening (37a, 37b) of a sleeve (37) changes when the distributor (38) is rotated by a first electric motor (46), if a rotor (42) is rotated by means of a second electric motor (47), an input port (31e) communicates with an output port (31f) through an inlet opening (42c, 42d) of the rotor (42), the communication hole group (38c, 38d) of the distributor (38), and the outlet opening (37a, 37b) of the sleeve (37) when the inlet opening (42c, 42d) of the rotor (42) passes through the overlapping sections, thereby making it possible to carry out PWM control of a flow rate of liquid. Since a thrust load in an axis (L) direction does not act on the distributor (38) and the rotor (42), supporting the distributor (38) and the rotor (42) becomes easy, thereby enabling the cost and weight to be cut.

Abstract: A control valve assembly is provided for a load carrying vehicle that includes a storage space and a dumping mechanism. The control valve assembly includes a housing and a sliding valve positioned within the housing and movable between a first position, and a second position. The sliding valve includes a first piston that defines a first piston first surface and a first piston second surface, and a second piston that defines a second piston first surface and a second piston second surface. The first piston second surface faces the second piston first surface. A pilot system includes a first pilot passage in fluid communication with the first piston second surface to selectively actuate the sliding valve toward the first position, and a second pilot passage in fluid communication with the second piston first surface to selectively actuate the sliding valve toward the second position.

Abstract: It is an object to provide a servo valve that can be manufactured at low cost by simplifying adjustment of the relative position between a nozzle and a flapper and simplifying the configuration of a valve-element driving circuit. Provided is a servo valve (1) including a spool (5) mounted so as to be movable back and forth; a first chamber (7) and a second chamber (9) that mutually push the spool (5) in opposite directions by means of fluid pressure; and a spool driving circuit (3) that supplies oil to the first chamber (7) and the second chamber (9) and that adjusts the pressure of supplied oil to move the spool (5) back and forth, wherein the spool driving circuit (3) maintains the fluid pressure of the first chamber (7) at a substantially constant level and includes, at an oil outlet of the second chamber (9), a nozzle flapper mechanism (27) that adjusts the fluid pressure of the second chamber (9).

Abstract: A railway brake cylinder includes a body (11?); a piston (13?) mobile relative to the body (11?) to act on a brake linkage and delimiting with the body (11?) a pressure chamber (10?) adapted to be supplied by a pneumatic pressure agent source; an auxiliary actuating member (26?) mobile relative to the body (11?) and the piston (13?), mechanically connected to manual operating elements to cause it to occupy either a rest position in which it is away from the piston (13?) or a pushing position in which it is in contact with the piston (13?); two orifices (73?, 51?) in fluid communication with the chamber (10?) and the atmosphere, respectively; and selective connecting elements (28?) between the two orifices (73?, 51?), the elements (28?) being mechanically connected to the auxiliary actuating member.

Abstract: A sliding valve having a valve slider that can be axially displaced relative to the valve sleeve in order to determine the size of variable passage cross-sections and for establishing a pressurization connection between a high-pressure connection and a working connection and a pressure-reducing connection between the working connection and a low-pressure connection, in that control edges running in the circumferential direction are configured on the outer circumference of the valve slider, which interact with the control edges of the valve sleeve. The control edges of the valve sleeve are configured as edges extending in the circumferential direction relative to the symmetry axis, which are a component of a lateral face of the valve sleeve.

Abstract: The invention relates to a slide vane (20) for a hydraulic power steering of automotive vehicles with a tubular control sleeve (24). Said control sleeve is connected to an output shaft (28) and comprises first control grooves (32) in its inner surface (34). Further, there is provided a tubular sliding sleeve (26) that is disposed at least in portions within said control sleeve (24). On its outer surface (38), the sliding sleeve (26) comprises second control grooves (36) that may be brought to coincide with the first control grooves (32) of the control sleeve (24), said first control grooves (32) being disposed substantially in the circumferential direction of the tubular control sleeve (24) and said second control grooves (36) substantially in the circumferential direction of said tubular sliding sleeve (26). The relative position of said control sleeve (24) and of said sliding sleeve (26) being relatively variable in the axial direction.

Abstract: The present invention provides a solenoid valve able to control flow amount as desired without receiving influence of change in fluid pressure. In the present invention, in a control valve for opening and closing a first poppet valve 103 and a second poppet valve 104 by a solenoid portion, a first pressure receiving area S1 which is a seating area of the first poppet valve 103, a second pressure receiving area S2 which is a seating area of the second poppet valve 104, a third pressure receiving area S3 which is a pressure receiving area of a first pressure sensing portion 145 and a fourth pressure receiving area S4 which is a pressure receiving area of a second pressure sensing portion 155 are made approximately equal to each other. Thereby unbalanced forces received from fluid flowing in and out when each poppet valve is actuated are all canceled.

Abstract: A fluid control device is disclosed that is configured to vent pilot volume through an exhaust port or exhaust passageway (140) integrated into the fluid control device. The fluid control device has a fluidic switch (112) configured to switch a pilot volume into the exhaust port or exhaust passageway (140) when a signal port or signal passageway (114) is de-pressurized. The fluidic switch (112) couples the signal port or signal passageway (114) to the pilot volume when the signal port or signal passageway (114) is pressurized.

Abstract: A hydraulic control apparatus of a continuously variable transmission of a hybrid vehicle may include a D-N control valve that converts a state, in which a hydraulic pressure is supplied from a line regulator valve to a solenoid feed valve through a second regulator valve according to changes of a driving pulley control pressure and a clutch lubrication control pressure with respect to driven pulley control pressure, and a state, in which the hydraulic pressure from the line regulator valve is directly supplied to the solenoid feed valve, into each other.

Abstract: A fueling valve for fueling a remote or radio-controlled vehicle or removing fuel therefrom has a sliding member in a cylinder to permit fuel to placed or removed from a vehicle as desired. Such a fueling valve greatly simplifies the transportation of the vehicle.

Abstract: A pump control system and a torque control valve are disclosed. In one embodiment, the torque control valve includes a sleeve, a spool disposed in the sleeve, and a piston rod disposed through the spool. The spool has a first recess area, a second recess area, and a third recess area. The first and third recess areas each have a port extending into a central bore of the spool. The piston rod includes a groove orifice feature having a spiral groove and is configured such that a fluid flowing from the port in the first recess area to the port in the third recess area must flow through at least a portion of the spiral groove. The fluid flowing through the spiral groove operates to bias the spool in a direction towards the second axial end of the spool.

Abstract: A pressure control valve includes a housing, a valve slide guided in the housing, on which at least one inflow control edge is configured, which cooperates with an inflow opening in the housing, a constriction in piston being present adjacent to inflow control edge, which lies at least approximately opposite to a control opening. It is provided that the valve slide have a circumferential annular groove, which lies on the side of the inflow control edge facing away from the constriction and approximately opposite the inflow opening.

Abstract: A valve for dispensing water and air in installations for spraying water under pressure, includes: firstly, a body (2) equipped with two independent circuits (C1, C2), each for circulating a fluid, one air, the other water, each of the circuits including (i) a chamber (5, 15) accommodating a shutter member (6, 16) in the form of a spool, (ii) a duct (7, 17) for admitting the fluid, (iii) a discharge duct (8, 18) for discharging the fluid, and (iv) a drain duct (9, 19) for draining the fluid contained in the discharge duct; and, secondly, control elements for controlling the shutter members so as to make each one move between an open position which allows the fluid to pass and in which the drain duct is shut off, and a closed position in which the fluid is prevented from passing and the drain duct is open.

Abstract: The present invention relates generally to flow regulation in aircraft systems. More particularly, the present invention relates to a flow regulator 100 and a high-lift system 200 for an aircraft incorporating such a flow regulator 100. The flow regulator 100 comprises a fluid input port 102 for receiving a pressurised fluid, a fluid output port 104 for providing fluid having a regulated flow rate, and a regulator valve 106 connected in fluid communication between the fluid input port 102 and the fluid output port 104. The regulator valve 106 is operable to provide regulated fluid at a substantially constant output flow rate to the fluid output port 104. The flow regulator 100 also includes a flow switching mechanism 108 for switching the substantially constant output flow of the flow regulated fluid provided by the regulator valve 106 between a first flow rate and a second flow rate, the first flow rate being less than the second flow rate.

Abstract: A servovalve includes a single motor which actuates separate valve members of separate servovalve assemblies. Each of the valve members controls the flow of hydraulic fluid from separate hydraulic fluid sources. In order to provide each valve member with the ability to operate in the event that the other valve member becomes inoperable, such as caused by jamming of the valve member, each servovalve assembly includes a compression assembly that provides each servovalve assembly with a jam-override capability.

Abstract: An electrically operated hydraulic valve comprises a valve assembly that provides a common valve passageway, an inlet port, an outlet port and a return port connected to the passageway and an axially movable valve device which allows in a first position fluid flow between the outlet port and the return port while closing the inlet and in a second position, axially displaced from the first position, fluid flow between the inlet port and the outlet port while closing the return port. A spring provides a restoring force urging the valve device to its first position. An electrically operated actuator coupled to the valve device comprises a permanent magnet and a cooperating electrical coil having an associated magnetic core, one or other of the magnet and the coil constituting a stator and the other constituting an armature which is coupled to the valve device to move it from the first position to the second position.

Abstract: A directly piloted valve assembly has a valve body including a bore, at least one inlet port, at least one outlet port and at least one exhaust port or second outlet port wherein the ports are all in fluid communication with the bore. A spool is received in the bore. The spool includes a wall defining a lumen. An actuator is received in the lumen. The actuator includes a shuttle seal channel. A shuttle seal is received in the shuttle seal channel. A solenoid is connected to the valve body. The wall of the spool includes at least one pilot hole in fluid communication with the lumen defined by the spool and the bore of the valve body.

Abstract: The invention relates to a hydraulic valve for an oscillating motor adjuster that utilizes camshaft alternating torques by means of non-return valves for more rapid adjustment. The non-return valve that is not used for the respective rotation is additionally closed by means of the piston of the hydraulic valve.

Abstract: A valve positioner for controlling a valve closure element is provided. The positioner includes a positioner housing with a plurality of fluid flow passageways in fluid communication with a fluid supply source and the valve closure element. The positioner housing is configured to receive a detachable spool manifold assembly. The spool manifold assembly is positioned adjacent the plurality of fluid flow passageways. The spool manifold assembly includes a reciprocally moveable spool configured to selectively port fluid flow from the plurality of fluid flow passageways. The spool manifold assembly includes a diaphragm connected to the spool via a flexible shaft. The diaphragm is in fluid communication with a transducer for receiving a fluid causing the diaphragm to expand or contract and thereby displacing the spool. The flexible shaft is radially elastic in order to minimize axial backlash between the diaphragm and the spool. The flexible shaft configuration minimizes the spool stroke.

Abstract: A control valve which has a substantially cylindrical valve box and a substantially cylindrical control piston. The control valve can be arranged in a cylindrical receptacle and the control piston is arranged so as to be axially displaceable inside the valve box.

Abstract: A microvalve device is disclosed for controlling fluid flow in a fluid circuit. The microvalve device comprises a body having a bore formed therein. A pilot-operated main valve spool supported by the body is movably disposed in the bore for opening and closing ports formed in the body. A pilot microvalve is operable for controlling movement of the pilot-operated main valve. The pilot microvalve may include a movable valve element that controls the cross-sectional area of two variable orifices in series. When the pilot microvalve is at rest, one orifice is closed and the other is open. Upon actuating the pilot microvalve, the closed orifice may begin to open and the open orifice may begin to close. Pressure between the orifices is used as a command pressure, which is utilized to position the pressure control valve to control load pressure. A method of operating a microvalve device is also disclosed.

Abstract: A packing attached to a spool of a spool valve has a ring-shaped inner-peripheral seal portion provided with an inner-peripheral seal face, a ring-shaped outer-peripheral seal portion provided with an outer-peripheral seal face, and an intermediate flexible portion interposed between the both portions and curved by an action of a fluid pressure, the intermediate flexible portion has both right and left flat side faces parallel with each other, a thickness of the intermediate flexible portion is formed smaller than the inner-peripheral seal portion and the outer-peripheral seal portion, and a ring width of the intermediate flexible portion in a packing radial direction is formed equal to or larger than the thickness.

Abstract: A valve assembly includes a solenoid can having an internal coil. A valve body connected to the solenoid can includes an inlet port and a first valve seat. An axially adjustable retainer threadably connected to the valve body includes an end portion defining a second valve seat. A homogenous valve member/armature slidably disposed in the valve body moves in the presence of a coil generated magnetic flux between valve closed and valve open positions. A valve member/armature first surface area is in fluid communication with a pressurized fluid through the inlet port. A valve member/armature second surface area is in fluid communication with the pressurized fluid in the valve closed position. The first surface area is equal to the second surface area and the pressurized fluid acts equally on the first and second surface areas defining a pressure balanced condition in the valve closed position.

Abstract: A valve assembly includes a solenoid can having an internal coil. A valve body connected to the solenoid can includes an inlet port and a first valve seat. An axially adjustable retainer threadably connected to the valve body includes an end portion defining a second valve seat. A homogenous valve member/armature slidably disposed in the valve body moves in the presence of a coil generated magnetic flux between valve closed and valve open positions. A valve member/armature first surface area is in fluid communication with a pressurized fluid through the inlet port. A valve member/armature second surface area is in fluid communication with the pressurized fluid in the valve closed position. The first surface area is equal to the second surface area and the pressurized fluid acts equally on the first and second surface areas defining a pressure balanced condition in the valve closed position.

Abstract: A solenoid valve includes a valve housing in which a spool valve element is fitted to be reciprocably slidable along an axis; a magnet coil that moves the spool valve element in a first direction along the axis by an action of an electromagnetic force; a return spring that biases the spool valve element in a second direction, opposite to the first direction, and moves the spool valve element in the second direction when the magnet coil is not excited; and first and second attraction members that are respectively fixed to the spool valve element and the valve housing such that they are spaced from each other along the axis by a distance no less than a maximum moving amount of the spool valve element and attract each other by an attraction force smaller than a bias force of the return spring when the magnet coil is not excited.

Abstract: A control valve for a hydraulic adjuster for the camshaft of an internal combustion engine is provided, wherein an actuator acts on a pressure part (12) embedded in a control piston (5). In order to prevent the piston (5) from being blocked in the valve housing by the expansion thereof caused by the pressure part embedment, the pressure part (12) and/or the control piston (5) is/are provided with radial recesses (34) in the embedment area (13) which make it possible to limit joining forces and the resulting radial expansion of the piston (5). Alternatively or in addition, the external surface of the control valve (5) has a reduced cross-section in the embedment area (13).

Abstract: A valve includes a valve body including a main passage defining a first volume and a second volume. The valve also includes a valve spool moveable relative to the valve body. The valve spool includes a central vent passage capable of fluid communication with each of the first volume and the second volume. Air flows between the first volume and the second volume through the central vent passage as the valve spool moves relative to the valve body and as the valve changes between an actuated position and a non-actuated position.

Abstract: An LIFD valve assembly has a pressure balance device a pressure balance slide of which is urged in the opening direction by a pressure downstream of a metering aperture and in the closing direction by a control pressure preferably corresponding to the highest load pressure of a plurality of consumers, and a load pressure downstream of the metering aperture is reportable to a line via the pressure balance device, and a load-maintaining device that can be put in a closing position, in which position a pressure medium flow path from a consumer to the metering aperture is blocked. The pressure balance slide is embodied in divided fashion, with an upper part and a lower part, wherein the latter is guided on the upper part, and determines the pressure balance device throttle cross section with a pressure balance control edge and embodies a closing body of the load-maintaining device.

Abstract: A valve system for pressure exchanger tubes of an energy recovery system is provided. The valve system includes a valve housing, a flow distributor, a hollow spool and a sealing system. The valve housing may comprise a set of high-pressure ports and a set of low-pressure ports. The flow distributor allows the flow to and from the set of high-pressure ports and the set of low-pressure ports within the valve housing. The hollow spool may be configured to reciprocate axially in a radial clearance between the valve housing and the flow distributor. The hollow spool may connect the pressure exchanger tube in fluid communication with the high-pressure ports or the low-pressure ports. The sealing system may be provided within the valve housing for imparting substantial hydraulic balance to the hollow spool.

Abstract: A valve assembly includes a valve housing. A valve body is movable within the housing. The valve body has a land to selectively block or communicate a supply port to an outlet. A piezoelectric bending element actuator moves the valve body to selectively communicate the supply port to the outlet port.

Abstract: A control spool for spool valves includes a tube having an outer circumference, and one or more rings and/or sleeves positioned on the outer circumference of the tube. The one or more rings and/or sleeves each defines at least one circumferential edge that forms at least one control edge.

Abstract: A control valve assembly for a load carrying vehicle that includes a storage space and a dumping mechanism that is movable between an open position that allows access to the storage space and a closed position that inhibits access to the storage space. The control valve assembly includes a housing and a valve that is positioned within the housing and is movable between a first position, wherein the dumping mechanism is moved toward the open position, and a second position, wherein the dumping mechanism is moved toward the closed position. First, second, and third actuation systems are in communication with the valve and are operable to actuate the valve between the first position and the second position.

Abstract: Some embodiments of the present invention provide a spool valve having a spool axially movable within a sleeve of two or more stacked rings having projections extending therebetween. One or more seals on the spool can slide across surfaces of the stacked rings in movement of the spool to different positions corresponding to different states of the valve. In some embodiments, one or more of the stacked rings can have projections extending toward and contacting an adjacent ring of the sleeve, thereby maintaining desired axial positions of the rings relative to one another while providing apertures through which fluid can flow and supporting surfaces for each seal as it slides from one ring to another.

Abstract: In a solenoid valve including a cylindrical sleeve which is formed with an input port, an output port, a drain port and a feedback port, and a spool which is inserted into the sleeve and which is formed with a plurality of lands for closing the individual ports, and a communication portion for communicating the individual ports; an input notch is formed in an end edge of the land located near the input port, while a drain notch is formed in an end edge of the land located near the drain port, and an axial height Hin of the input notch and an axial height Hdr of the drain notch are set so that the proportion ? (=Hin/(Hin+Hdr)) of the height Hin to the sum of the heights Hin and Hdr may fall within a range of at least 0.72 (preferably, 0.85) and less than 1.0.

Abstract: The invention relates to a seat cleaning-capable double-seat valve (1) with two serially arranged closing elements (3, 4), moveable relative to each other and designed as slide pistons, which prevent in the closed position of the double-seat valve (1) the overflow of fluids from one valve housing part (1a; 1b) into another (1b; 1a) through a connecting opening (2c) connecting the valve housing parts (1a, 1b) with each other and which border both in the closed and open position of the double seat valve (1) a leakage cavity (9), which is connected with the surroundings of the double-seat valve (1) via a tubular shaft (4b/4c) arranged on a low-lying (with respect to a vertical normal position of the double-seat valve (1)), second closing element (4), in which a drainage hole (4d) is arranged. An axially relocatable, cylindrical annular slide part (5) is provided.

Abstract: A pilot valve (3) is designed as a directional control valve in which a control slide (20) is movably disposed in a longitudinal bore (22) of the valve body (21) so as to control the flow of hydraulic oil between two working connecting bores (A, B), a pump connecting bore (P), and a reservoir connecting bore (T). A check valve (32) which is biased with the aid of a bias spring (33) is disposed within the control slide (20). The check valve (32) is connected to an auxiliary control groove (28) via a first transversal bore (29) while being connected to the B-reservoir groove (23) via a second transversal bore (31). The check valve (32) is to be opened from working connecting bore B while the auxiliary control groove (28) is arranged between the B control groove (24) and the B reservoir groove (23) and is delimited on both sides by means of sealing cylindrical areas (35, 36).

Abstract: A control valve comprises a valve body having a fluid inlet and at least one work fluid outlet for supplying pressurized fluid to the fluid operated device. A valve member is movable in the valve body in a first direction from a null position to a full flow or open position for supplying flow of pressurized fluid from a feed passage to a work fluid outlet. The valve member has a load sense signal shaping device that provides for initial flow from the feed passage to the work fluid outlet through a metering orifice during movement of the valve member from the null position to the full flow open position so as to shape an initial boost pressure signal.

Abstract: A pressure control valve includes a sleeve on which an input port, an output port, and drain ports are formed; and a linear solenoid portion for generating thrust. The pressure control valve further includes a first spool, which advances and retreats within the sleeve, for receiving the thrust, regulating input pressure input to the input port, and outputting the regulated output pressure from the output port; and a second spool, which advances and retreats within the sleeve, for receiving the thrust, and selectively applying output pressure to the first spool. The output pressure is selectively applied to the first spool, thereby doing away with the need for a control valve or the like. This simplifies the oil pressure circuit for generating control pressure, and allows control pressure to be generated in a stable manner, and the size of the pressure control valve to be reduced.

Abstract: A proportional solenoid 5 comprising: an electromagnetic coil 9; a fixed yoke 10 provided immovably inside the electromagnetic coil 9 and having a convex portion 13 formed at an edge portion of an end surface of the fixed yoke; and a movable yoke 20 that is disposed inside the electromagnetic coil 9, has a tip portion thereof inserted into the convex portion 13 of the fixed yoke 10, and is provided movably relative to the fixed yoke 10, the proportional solenoid 5 enabling the position adjustment of the movable yoke 20 by controlling an electric current applied to the electromagnetic coil 9, wherein a protruding portion 21 that protrudes at the side of the fixed yoke 10 is formed at an edge portion of the surface of the movable yoke 20 on the side of the fixed yoke 10, and an inner surface 21b of this protruding portion 21 is tapered such that the inner surface is located further outside as the inner surface approaches the fixed yoke 10.

Abstract: In a solenoid valve, multiple flow-blocking portions are formed in a passage between a supply port (23) and an output port (24) and a passage between the output port (24) and a drain port (25). The flow-blocking portions, having an overlap length that corresponds to the movement amount of a spool (30), are formed by the outer peripheral faces of lands (32, 33) and the inner peripheral face of a spool case (10).

Abstract: An automatic transmission having at least one hydraulic valve with flow force compensation. The hydraulic valve includes a valve body having a valve bore and at least one inlet and at least one outlet adapted to provide fluid communication with a source of pressurized hydraulic fluid and a return to the source of pressure. A valve member is slidingly disposed within the valve body that includes at least one valve element having an outer diameter and a metering face. The metering face is adapted to control the flow of pressurized hydraulic fluid between the inlet and the outlet of the valve body. The metering face includes a flow force compensating annular void disposed adjacent to the outer diameter that is defined by a lead angle ? measured between the outer surface and a line intersecting the outer surface and tangential to the annular void.

Abstract: A solenoid valve apparatus includes a solenoid valve and a switching device that switches between a first state in which the working fluid in the pump chamber is discharged when the solenoid valve functions as a regulator valve and a second state in which discharge of the working fluid from the pump chamber is prohibited when the solenoid valve functions as the electromagnetic pump.

Abstract: An electromagnetic hydraulic valve (1), in particular proportional valve, for controlling a device for the rotational angle adjustment of a camshaft relative to a crankshaft of an internal combustion engine, composed of an electromagnet (2) with a hollow-cylindrical magnet housing (4), at least one coil winding (5), an axially moveable magnet armature (6), a first and a second pole shoe (7, 8), a valve part (3) with a hollow-cylindrical valve housing (9) having a control piston (12) which can be moved axially by the magnet armature (6) of the electromagnet (2) via a plunger rod (11). The invention consists of a sleeve (17), composed of a base (18) and a hollow-cylindrical side wall (19), which is arranged on that end of the control piston (12) and situated in the direction of the plunger rod (11), where the sleeve (17) has a greater hardness than the control piston (12).