Abstract: A spool-sleeve assembly includes a sleeve having a first inner radius. Flanges are integrally formed with the sleeve. The flanges extend outwardly. The flanges have flange segments via slits, disposed in the flanges. Press fittings extend inwardly from an inner wall of the sleeve proximate the ends and the slits. The sleeve has a second inner radius, smaller than the first inner radius, at the press fittings. A hole is provided through the sleeve between the flanges. The spool-sleeve assembly also includes a spool, slidably disposed inside the sleeve. Ridges outwardly extend from the spool at the ends of the spool. The ridges have outer diameters that are greater than the second inner radius. Grooves are provided in the ridges. The press fittings fit in the grooves.

Abstract: A spool for a spool valve assembly defines a spool longitudinal axis and includes a first land module defining a first land module circumferential surface, a second land module defining a second land module circumferential surface, and a first metering module. The first metering module has a first end cap and a second end cap. The first end cap is coupled to the first land module, and the second end cap is coupled to the second land module, to form the spool. The first metering module may further include at least two pillars extending from the first end cap to the second end cap, wherein the at least two pillars are entirely disposed within a virtual first metering module hollow cylinder area that surrounds a virtual first metering module central core area concentric with the spool longitudinal axis.

Abstract: A hydraulic fluid control valve (HFCV) configured to recirculate an exiting hydraulic fluid from a first hydraulic actuation chamber to a second hydraulic actuation chamber is provided. The HFCV includes a selectively movable spool having an inner fluid chamber configured to receive and deliver the exiting hydraulic fluid to one or both of either a sump or one of the first or second hydraulic actuation chambers.

Abstract: A valve assembly includes a valve body defining a cylindrical passage therein about an axis. An inlet port is defined in or near a first end of the valve body. First and second outlet ports are defined in the valve body extending radially outward from the cylindrical passage. A cylindrical valve spool having a central passage is positioned within, and sealingly engaged with, the cylindrical passage. The valve spool is moveable along the axis among: a first position wherein the inlet port is in fluid communication with the first outlet port but not the second outlet port, a second position wherein the inlet port is in fluid communication with the second outlet port but not the first outlet port, and an intermediate position between the first and second positions wherein the inlet port is in fluid communication with both of the first and second outlet ports.

Abstract: Disclosed herein are devices and methods for collecting samples of bodily fluid that may be substantially free of contamination, even where an initial amount of contamination may be present in a collection device, such as a urethral catheter. In the disclosed device and methods, the sample may be collected mid-stream, after an initial amount of fluid has flushed away the initial contamination. The disclosed devices may include a diverter device comprising a fluid control valve that may manually be moved between a first position and a second position that, respectively, direct fluid to two different channels and/or receptacles.

Abstract: A valve may have a fluid inlet and a fluid outlet. The valve may include a valve stem having a lumen extending from a first opening at a proximal portion of the valve stem to a second opening at a distal end of the valve stem. A plurality of seals may be positioned relative to the valve stem. The valve stem and seals may be configured so that a fluid entering the inlet is prevented from flowing to the outlet in a first position of the valve stem and relative to the inlet and the outlet. The valve stem and the seals may be configured so that a fluid entering the inlet flows to the outlet in a second position of the valve stem relative to the inlet and the outlet, the second position being more distal than the first position relative to the inlet and the outlet.

Abstract: A valve body defines a work passage, a high-pressure channel fluidly connected to the work passage, a tank passage, and a cavity disposed between the high-pressure channel and the tank passage. The cavity fluidly connects the high-pressure channel and the tank passage. The cavity is defined at least in part by a first portion within which a relief valve threadedly engages, a second portion disposed adjacent to the high-pressure channel, and an annulus interposed between the first portion and the second portion. The annulus fluidly connects to the tank passage. A surface area of the relief valve exposed to the annulus is greater than a cross-sectional area of the high-pressure channel.

Abstract: An electro-hydraulic proportional valve includes: a valve core; a valve sleeve, sleeving an outside of the valve core; a valve body, sleeving an outside of the valve sleeve and fixedly connected to the valve sleeve; a left end cap, covering an end of the valve body, a left sensitive cavity being defined by the left end cap, the valve body, and the valve sleeve; a right end cap, covering the other end of the valve body, a right sensitive cavity being defined by the right end cap, the valve body, and the valve sleeve; a driving mechanism disposed out of the valve body; and a transmission mechanism connected to the driving mechanism and the valve core.

Abstract: A valve, includes a valve body comprising a bore having a first seal plate and a second, opposed seal plate, therein, the first seal plate including a first seal plate opening therethrough, a first port in fluid communication with the bore through the first seal plate opening, a second port in fluid communication with the bore, a third port in fluid communication with the bore, the second port disposed intermediate of the first and third ports, a bilateral sealing assembly comprising a tubular body having a first outer surface adjacent a first end face thereof, and a second outer surface adjacent a second end thereof opposite of the first end face.

Abstract: A balancing valve includes four ports. While the pressures at a pair of balancing ports of a hydraulic balancing valve are equal, the valve maintains two other ports in a closed position. Upon a pressure differential between the balancing ports, fluid communication can occur between one of the balancing ports and either of the other ports based upon the direction of the pressure differential. A hydraulic ride control system utilizes the balancing valve together with other control valves to provide ride control functionality.

Abstract: In a fast-switching 2/2-way cartridge valve, which can serve as a check valve, a closing movement of the closing body thereof is damped by contact portions which lie on one another and are movable in relation to one another during the closing movement. The contact portions are formed on the closing body and on the valve bore in which the closing body is guided.

Abstract: A spool valve assembly, configured to control the flow of fluid, includes a spool valve, configured to move axially along an axis to control fluid flow, having a spool cavity and a plurality of spool apertures that communicate fluid between the spool cavity and an outside surface of the spool valve; a valve sleeve, in which the spool valve is concentrically positioned, that slidably receives the spool valve; and a valve plug, received within the spool cavity, having at least one plug aperture and a plug cavity, wherein the spool apertures at least partially overlap the plug aperture(s) in a radial direction to permit the flow of fluid between the plug cavity and the outside surface within a defined flow rate variance regardless of the angular position of the valve plug relative to the angular position of the spool valve.

Abstract: An inflation system includes a base, an adjuster and a first sealing device. The base is provided with a receiving cavity, an air inlet and an inflation inlet, the adjuster is rotatably configured in the receiving cavity, and the first sealing device is adapted for sealing the inflation inlet. The adjuster is turnable between a communication position and a separation position to open or close the inflation inlet, at the communication position, the first sealing device is openable under an action of high pressure air to communicate the inflation inlet with the air inlet; at the separation position, the adjuster stops high pressure air from opening the first sealing device thereby separating the inflation inlet from the air inlet. Different air passages can be selected in the invention, and the usage is convenient and safe.

Abstract: A servovalve comprising: a fluid transfer valve assembly comprising a supply port and a control port; a moveable valve spool arranged to regulate flow of fluid from the supply port to the control port in response to a control signal; and a drive member configured to axially move the valve spool relative to the fluid transfer assembly in response to the control signal to regulate the fluid flow.

Abstract: A control valve includes a metal insert extending along an axis and presenting an interior insert surface defining a fluid passage. The control valve also includes a valve member slidably disposed in the fluid passage, and a composite valve body. The composite valve body has a first and second protrusion disposed about the axis. The first protrusion is spaced from the second protrusion along the axis. The composite valve body has a connecting bridge integral with and extending between the first and second protrusions. The connecting bridge has a first connecting side and a second connecting side spaced from the first connecting side, with the axis, the first connecting side, and the second connecting side defining a central angle between 5 and 45 degrees.

Abstract: A device for detecting the balance of a hub valve hole that includes a hub conveying roller bed configured to sequentially convey a hub from an upstream of a conveying belt to a hub identification device and a valve hole balance detection device until the hub leaves the valve hole balance detection device, wherein the hub identification device includes an electronic belt scale configured to obtain the weight of the hub and an industrial camera configured to take a photo of a wheel disc of the hub when the hub is conveyed to the hub identification device. The device can accurately identify the hub type and then automatically complete the valve hole compensation function of balance detection through the combination of the above components, program control and an algorithm, thereby improving the automation level and reducing the repeated operation of an operator.

Abstract: A valving arrangement is provided with a specially designed second fluid port which equalizes lateral forces induced upon a spool valve to greatly reduce or eliminate such forces and thereby virtually eliminate laterally induced ware upon the spool valve or a valve port.

Abstract: A valve spool may include a cylindrical spool body having a spool longitudinal axis, a first spool body end wall and a second spool body end wall disposed axially opposite the first spool body end wall, and a spool outer surface. The spool outer surface may include a first spool guide region proximate the first spool body end wall and having a spool guide region outer diameter, a second spool guide region proximate the second spool body end wall and having the spool guide region outer diameter, and a spool tight clearance region disposed between the first spool guide region and the second spool guide region. The spool tight clearance region may have a spool tight clearance region outer diameter that is greater than the spool guide region outer diameter.

Abstract: An example valve includes: a sleeve having a plurality of sleeve openings; a first conduit configured to be in hydraulic communication with a first chamber, where a first pressure sensor is disposed in the first conduit and configured to measure a pressure level of fluid in the first chamber; a second conduit configured to be in hydraulic communication with a second chamber, where a second pressure sensor is disposed in the second conduit and configured to measure a pressure level of fluid in the second chamber; a spool rotatable within the sleeve, wherein the spool includes a plurality of spool openings respectively corresponding to the plurality of sleeve openings; a rotary actuator coupled to the spool and configured to rotate the spool within the sleeve in clockwise and counter-clockwise directions; and a controller configured to cause the spool to rotate to one of a plurality of rotary positions.

Abstract: An inner oil passage (45) is formed inside a slidable spool (22). The slidable spool (22) defines, in its circumferential face, a first opening (46), a second opening (47) and a third opening (48). The first opening (46), the second opening (47) and the third opening (48) are communicated to the inner oil passage (45). When the slidable spool (22) is switched to a floating position (F), the first the first opening (46) is aligned with a first port end portion (25a), the second opening (47) is aligned with a second port end portion (26a), and the third opening (48) is aligned with a fourth port end portion (24a), respectively, and a first cylinder port and a second cylinder port are communicated to a tank port (24) via the inner oil passage (45).

Abstract: A valve device which comprises a valve housing having a plurality of shifting tongues and a valve slide that can move longitudinally in the valve housing. The valve slide is made with diameter sections which co-operate with the shifting tongues depending on an axial position of the valve slide. At least one of the diameter sections is made with at least one, at least approximately groove-like recess that extends in the circumferential direction of the valve slide. The groove-like recesses are functionally connected to an axial bore extending in the valve slide essentially in the axial direction, by way of at least one radial bore extending at least approximately in the radial direction in the valve slide.

Abstract: A hydraulic valve for a cam phaser, the hydraulic valve including a bushing element, including a longitudinal channel, a first transversal channel originating from the longitudinal channel, a second transversal channel originating from the longitudinal channel, a pressure balanced hollow piston arranged within the longitudinal channel axially moveable between a first end position and a second end position, wherein the longitudinal channel includes a first channel section with a larger inner diameter and a second channel section with a smaller inner diameter, wherein the first transversal channel originates from the first channel section and the second transversal channel originates from the second channel section, wherein the hollow piston includes a longitudinal channel with an axial opening, at least one transversal channel, a first piston section with a greater outer diameter and a second piston section with a smaller outer diameter.

Abstract: A control valve includes a valve housing extending along a longitudinal axis. The valve housing defines an inlet port, a first outlet port, and a second outlet port. In addition, the control valve includes a spool guide disposed inside the valve housing and a flow guide belt disposed around the spool guide. The flow guide belt is disposed inside the valve housing. The control valve further includes a spool movably disposed in the spool guide. The spool can move relative to the valve housing along the longitudinal axis between a first spool position and a second spool position. The first outlet port is in fluid communication with the inlet port when spool is disposed in the first spool position.

Abstract: Blowout preventer (BOP) systems and methods for providing additional redundancy and reliability are provided. A BOP system for providing additional redundancy can include a first set of components including a BOP control pod with a primary regulator and a secondary regulator, where the primary regulator and the secondary regulator are arranged in a parallel configuration; a hydraulic supply line in communication with the BOP control pod; a pod select valve in communication with the primary regulator and the secondary regulator; and a bypassable hydraulic regulator in communication with the pod select valve; and a second set of components, the bypassable hydraulic regulator disposed between the pod select valve and the second set of components, where a hydraulic regulator bypass line bypasses the bypassable hydraulic regulator between the pod select valve and the second set of components.

Abstract: A hydraulic valve for a cam phaser including a pressure balanced hollow piston that is arranged axially movable, wherein the hollow piston at its end oriented towards the pressure medium connection includes a first piston section with a first small outer diameter, and adjacent to the first piston section a second piston section with a second large outer diameter, and a third piston section with a third medium outer diameter, wherein the hollow piston includes a respective pressure surface for pressure compensation at the first piston section and at the third piston section which are respectively loadable with an axial force that is oriented away from the pressure medium connection when the hollow piston is loaded with pressure, wherein a resultant force of the axial forces impacts the hollow piston, and another pressure surface is provided at the second piston section of the hollow piston.

Abstract: A valve for controlling a fluid flow comprising: an inner sleeve having a control surface and a middle sleeve, wherein a first movement of the inner sleeve with respect to the middle sleeve can be carried out, wherein the valve comprises a control piston, wherein the first movement prompts a second movement of the control piston, whereby the valve is moved into a switched state.

Abstract: Electromagnetic fluid valve regulating the throughflow of a pressure medium which flows through a housing part having at least two inlet openings which lie opposite one another and at least one outlet opening for the pressure medium. It being possible for a channel which is situated between the inlet openings and the outlet opening to be closed to a greater or lesser extent by an axially movable slide for regulating the throughflow of the pressure medium, a pin protruding into the channel centrically with respect to the center axis of the fluid valve, the pin being provided, for flow guidance, with an outer contour which is of at least approximately conical, pyramidal or hyperbolic design, with the result that the pressure medium which is to flow from the inlet openings strikes the outer contour of the pin and diverted in the direction of the at least one outlet opening.

Abstract: A valve housing for a control valve of a camshaft adjuster, including a housing flange for fastening to a control unit as well as an essentially cylindrical housing component for accommodating a control piston. It is provided that the housing component is rotatably fixedly attached to the housing flange by a form-locked connection. A valve housing of this type is cost effective to manufacture and has a low weight, while ensuring operational reliability. The invention furthermore relates to a method for manufacturing an aforementioned valve housing.

Abstract: A valve device (14) of a hydraulic system (1) for actuating at least one shifting element (2) of a transmission. The valve device comprising a pilot-controlled control valve device (3) with a valve slide (9) and, functionally connected with this is, an also pilot-controlled switching valve device (4) which is also formed with a valve slide (7). The valve slides (7, 9) are arranged to move longitudinally in a common bore (15) of a valve housing (16) and are positioned coaxially with one another, and an inner valve slide (7) is arranged to move longitudinally at least partially within the outer valve slide (9).

Abstract: A steplessly adjustable hydraulic insert valve has a housing defining a radial direction and an end side in an installation direction. An inflow connector on the end side is connectable to a pressure medium source. First and second working connectors and a return connector are arranged in the radial direction. The return connector is connectable to a pressure medium tank. The housing has an axial bore and an actuator guided movably therein. The actuator can be held in an axial center position by at least one spring and is adjustable steplessly axially out of the center position by controllable actuation. At least one of the working connectors is fluidically connectable to the return connector by axial adjustment of the actuator. The actuator has a radial widened portion with first and second control edges for steplessly opening and/or closing first and second radial openings, respectively, of the return connector.

Abstract: A valve device includes a housing (2) and a valve piston (4) axially displaceable in a piston bore (3) of housing (2). First and second load connections (A, B) can alternately be connected to a pressure connection (P) and to tank connections (T1, T2) by moving the piston from an idle position by first and second solenoids (5, 6). First and second pilot control chambers (7, 9) pressurize first and second piston back sides (8, 10) of the valve piston (4). The pressure in the pilot control chambers (7, 9) is controlled by first and second pilot control pistons (12, 13) movable by the solenoids (5, 7). The pilot control chambers (7, 9) are connected via a connection (11) to the pressure connection (P). The pilot control pistons (12, 13) open or close connections (14) between the pilot control chambers (7, 9) and the tank connections (T1, T2).

Abstract: An airflow control valve (20) for use in a breathing apparatus (10) to control a flow of air from a pressurised air supply to a respirator. The valve comprises an inlet port (31) for connection to a pressurised air supply, and first (32) and second (33) outlets. The valve is configurable between a first position in which the inlet port is in restricted fluid communication with the first outlet to allow a restricted flow of air from the inlet port to the first outlet and in which the second outlet is sealed from the inlet port and, a second position in which the inlet port is in substantially unrestricted fluid communication with the second outlet to allow an unrestricted flow of air from the inlet port to the second outlet.

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: 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: There is provided a fluid rerouting system for valve bodies that use hydraulic pressure, via a balance pressure line, to move spools. In an exemplary embodiment, the system comprises a valve sleeve having a plurality of ports that are substantially aligned with a plurality of fluid connections in the mating bore, except that no valve sleeve port aligns with the balance pressure line. The system also includes a spool having a plurality of lands that are sized and configured to fit slidably in said valve sleeve. The combination of the valve sleeve and at least one of the lands form a chamber, fluid access to which is via an aperture traversing the land. Means for blocking the access of said balance pressure line to said valve sleeve are also included.

Abstract: A central valve of a camshaft adjuster of an internal combustion engine, which has a valve housing, a control piston, and a mounting flange. The valve housing is arranged, at least in part, inside a receptacle inside the camshaft adjuster. The valve housing has at least one inflow connection, one outflow connection, and one working connection. The control piston is arranged axially slidable inside the valve housing. The pressure fluid, which flows to and from the camshaft adjuster, can be controlled by the suitable positioning of the control piston inside the valve housing. Also, the mounting flange is fixedly connected to a wall section of the receptacle, thus determining the axial position of the valve housing relative to the camshaft adjuster.

Abstract: A valve device is provided for a pneumatic brake system of a commercial vehicle and comprises a pilot piston, radial seals and at least one valve seat, which can be displaced in the direction of motion of the pilot piston.

Abstract: A control valve includes a signal pressure passage that transmits a pilot pressure of first and second pilot chambers as a signal pressure of another device, a connecting groove that is formed in a spool and connects the first pilot chamber to the signal pressure passage when the spool is in a neutral position, a connecting hole that is formed in the spool and connects the second pilot chamber to the signal pressure passage, and a check valve that is interposed in the connecting hole and permits a flow only from the second pilot chamber to the signal pressure passage. The connecting groove connects the first pilot chamber to the signal pressure passage when the pilot pressure is led into the first pilot chamber, and blocks communication between the first pilot chamber and the signal pressure passage when the pilot pressure is led into the second pilot chamber.

Abstract: A solenoid valve has a body with a fluid passage extending longitudinally at least partially through the body. Each of supply, control, and exhaust ports is disposed through the body and operably connected to the passage (the supply port also introducing fluid medium from a pressure source). Among the ports, there is a valve member operably disposed in the passage. A bore extends at least partially through the member. A metering orifice connects the passage or exhaust port with the bore. A solenoid portion has a coil with an armature movable within the portion in response to energization of the coil, and a shaft is connected to the armature. The shaft extends partially into the body and directly contacts the member, and the energization of the coil causes the shaft to slide within the solenoid portion and move the member in response to movement of the armature within the portion.

Abstract: A control valve for controlling pressure medium flows, which has a cylindrical valve housing with a housing cavity The housing cavity is open at one side and has an axial outflow port, a radial first working port, a radial second working port, a radial third working port and two radial pressure ports which each open into the housing cavity. A first pressure port is arranged axially between the first working port and the second working port, and a second pressure port is arranged axially between the second working port and the third working port. Also, the control valve has a cylindrical control piston, which is axially movable within the housing cavity and has a piston cavity open at one side in the direction of the outflow port.

Abstract: The invention relates to a proportional directional control valve for controlling a hydraulic consumer, having a housing with a pressure port, a tank port, and first and second working ports. A control element is movably mounted in the housing. A single actuator is provided for moving the control element, which, in dependence on its position relative to the housing, enables different flow paths between the ports. The control element, starting from a first switching position in which both working ports are connected to the tank port, is movable by the actuator via a second switching position that follows the first switching position, to a third switching position that follows the second switching position. It is possible, by moving the control element from the first switching position into the third switching position, to successively disconnect the two working ports from the tank port and connect them to the pressure port.

Abstract: A hydraulic valve comprises a plurality of ports, which communicate with a passageway, and a valve member movable in the passageway to control the communication between the ports. The valve member carries a lateral shear seal which is integral with the valve member and engages the passageway. In one position, the valve member isolates a first port from a second port. In another position of the valve member, the shear seal communicates with the first port and provides communication between the first port and the second port by way of a passage within the valve member. The valve member has first and second portions of different effective cross-section areas and on each portion an integral sealing member makes a radial seal between the valve member and the passageway. A supply port supplies pressure to the outside of the valve member so as to produce by virtue of the different cross-sectional areas a force tending to move the valve member towards a closed position.

Abstract: A fuel return valve and system includes a flow-level select and shut-off valve and a servo control valve. The flow-level select and shut-off valve includes a first fuel inlet, a second fuel inlet, a return-to-tank fuel outlet, and a valve element movable between a shut-off position, a mid-flow position, and a max-flow position. The servo control valve is coupled to the flow-level select and shut-off valve and is configured to control relative fluid pressures therein to selectively move the valve element to the shut-off position, the mid-flow position, and the max-flow position.

Abstract: A valve having a metal insert with a fluid passage formed in the metal insert. A composite valve body is disposed at least partially around the metal insert and having at least one port in fluid communication with the fluid passage with the metal insert. A valve member is partially disposed in the metal insert and operable to control the fluid flow through the fluid passage of the metal insert and parts of the valve body.

Abstract: A pressure control valve includes a housing comprising a reference pressure connection, a reference pressure chamber, a preliminary pressure connection, a preliminary pressure chamber, a control pressure connection and a control pressure chamber which are configured to cooperate with a control member moveable in an axial direction within the housing so as to adjust a desired control pressure between a preliminary pressure at the preliminary pressure connection and a reference pressure at the reference pressure connection. A driving device is configured to act on the control member. At least one first sealing device is configured to seal the reference pressure chamber against the control member. At least one second sealing device comprising a second sealing element is configured to seal the preliminary pressure chamber against the reference pressure chamber. At least one third sealing device is configured to seal the control pressure chamber against the preliminary pressure chamber.

Abstract: A spool for a servovalve. The spool includes a first end land and a second end land. The spool includes an intermediate land having a first side and a second side opposite the first side. The intermediate land is positioned between the first end land and the second end land in a spaced-apart, axially aligned relationship such that a first annular space is defined between the first end land and the first side of the intermediate land and a second annular space is defined between the second end land and the second side of the intermediate land. The intermediate land further includes at least one fluid passageway formed in and extending through the intermediate land from the first side to the second side to establish fluid communication between the first annular space and the second annular space to provide a fluid pressure feedback between the first and second annular spaces.

Abstract: A fluid control valve wherein a main valve body includes: a high-pressure passage providing communication between a suction port and a sleeve in which a spool is fitted; a tank passage providing communication between a discharge port and the sleeve; a lift lock poppet located between the sleeve and a cylinder port and assuming an open position for providing communication between the sleeve and the cylinder port; a hydraulic fluid discharge passage providing communication between a back-pressure chamber provided within the lift lock poppet and the sleeve; a hydraulic fluid delivery passage located between the sleeve and the lift lock poppet; a cylinder passage located between the lift lock poppet and the cylinder port that communicates with the hydraulic fluid delivery passage when the lift lock poppet is in the open position, and a communication passage providing communication between the hydraulic fluid discharge passage and the hydraulic fluid delivery passage.

Abstract: A slide-type pressure control valve having an improved damping behavior is described.

Abstract: A control valve (14) for a device (1) for altering the valve timing for gas exchange valves (110, 111) of an internal combustion engine (100) is provided. A non-return valve (54) is located within an annular groove (44) formed on one of the components of the control valve (14) and pressurized medium flows through the annular groove. The assembly of the device is facilitated.

Abstract: A proportional pressure control valve includes a valve box (10) having a pump (P), user (A) and reservoir (T) connections. Control piston (18) is guided in a longitudinally displaceably inside the valve box (10) for optionally connecting the pump connection (P) to the user connection (A) and the user connection (A) to the reservoir connection (T). A fluid-carrying connection is established between the pump connection (P) and a pilot chamber (20) of a pilot valve (22). The pilot valve (22) is controlled by a magnet system, especially a proportional magnet system (28). The proportional pressure control valve, for the fluid-carrying connection to the pilot chamber (20), has a bore (27) extending axially inside the wall of the valve box (10) and from a radial bore (9) of the housing (10) forming the pump connection (P).