Abstract: According to the embodiment of the present disclosure, it provides an inspection valve installed at a flow path connecting a reservoir to a chamber of a master cylinder, comprising: a housing at which a bore is formed and having one side at which an inlet hole is formed; a plunger provided to be movable along the bore of the housing; a seat member configured to close one side of the bore and through which an outlet hole passes; and an elastic member having one side supported by the plunger and the other side supported by the seat member, wherein the plunger is provided to block the outlet hole when a hydraulic pressure flowing in through the inlet hole is greater than an elastic force of the elastic member.

Abstract: A self-holding electromagnetic valve includes: a solenoid having a tubular guide part having the same center as a central axis extending in an axial direction; a axially movable element located radially inside the guide part; a cover housing the solenoid and the movable element, having a hole portion, and made of a magnetic material; a pin located at the hole portion and movable along with movement of the movable element; and a valve section provided outside the cover and opened/closed along with movement of the movable element and the pin. The solenoid has a cylindrical part with an inner circumferential surface that receives the guide part, tooth parts that extend radially outward from the cylindrical part and are made of a magnetic material, bobbin parts provided each tooth part, and coils wound around the bobbin parts.

Abstract: A magnetically actuatable valve device, including an inner chamber delimited by at least one wall of magnetizable material, which wall forms a valve seat, and a magnet arrangement which generates a magnetic circuit with magnetic flux running in the magnetizable wall, and at least one magnetizable valve body which is moveable in the inner chamber, wherein at least one intermediate element is arranged in the wall extending around the inner chamber and with reduced magnetic conductivity in comparison with the wall, wherein the intermediate element includes a recess where a projection of the wall extends, where two magnetizable guide elements are arranged in the inner chamber on opposite sides of the valve body; and offset to the recess, wherein the guide elements guide the valve body and together with the wall form the magnetic circuit, wherein magnetic flux runs through the wall, the valve body, and guide elements.

Abstract: An electromagnetic valve includes: a solenoid having a tubular guide part having the same center as a central axis extending in an axial direction; a movable element disposed inside the guide part and movable in the axial direction; a cover housing the solenoid and the movable element, defining a hole portion, and made of a magnetic material; a pin located at the hole portion and movable along with movement of the movable element; and a valve section provided outside the cover and opened/closed along with movement of the movable element and the pin. The solenoid has a core that surrounds an outer side of the movable element in the radial direction, and a coil that magnetizes the core. The core has an annular ring part surrounding the outer side of the movable element, and tooth parts protruding radially outward from the ring part on which the coil is mounted.

Abstract: An assembly for actuating a double-acting shift cylinder of a shift assembly of an automatic transmission of a motor vehicle includes a hydraulic fluid reservoir having a motor-driven hydraulic pump and two control valves that are each connected to a pressure supply line of the hydraulic pump and to a return line to the hydraulic fluid reservoir. The shift cylinder has two pressure chambers that are each connected to one of the control valves. The control valves each connect one pressure chamber of the shift cylinder to the pressure supply line of the hydraulic pump or to the return line to the hydraulic fluid reservoir. The actuating assembly includes at least one pressure-limiting valve that connects the pressure supply line to the return line if a hydraulic over-pressure is present. The control valves can be 3/2-directional valves having integrated pressure-limiting valves.

Abstract: A flow regulator which is capable of suppressing hysteresis and includes a housing which includes a fluid inlet port, a fluid outlet port and a valve seat positioned in a communication channel, through which the fluid inlet port and the fluid outlet port are communicatively connected; a plunger guide cylinder coupled to the housing; a plunger provided at an end thereof with a valve body which moves toward and away from the valve seat, the plunger being inserted into the plunger guide cylinder to be freely movable in an axial direction; a spring which biases the plunger in a direction to bring the valve body into contact with the valve seat; and an electromagnetic device which moves the plunger in a valve opening direction against the spring.

Abstract: A printed circuit assembly (PCA) that provides for a method of rebuilding an electrically operated automatic transmission solenoid module. The PCA allows for a repairable yet rugged interconnection of several solenoids that reside within the span of the module assembly.

Abstract: A solenoid valve includes a valve configured to control a flow of a fluid; and a solenoid configured to operate the valve. The valve includes: a holder having a double tube structure including an inner tube formed with a supply passage and an outer tube, a control passage being formed between the inner tube and the outer tube; a first connection port formed at a first end of the inner tube to connect the supply passage and the control passage; a ball installed within the supply passage to open and close the first connection port; a core coupled to a first end of the outer tube; a second connection port formed in the core and connected to the control passage; and a load installed to extend through the second connection port and moved by the solenoid.

Abstract: The present invention relates to an oil control valve for a variable valve lift system that obtains in a stable manner a constant hydraulic pressure in the hydraulic line connecting the oil control valve and the vale lift control actuator, and thereby reliably controls valve lift according to the number of revolutions and load of the engine.

Abstract: The magnetically actuable valve has an interior space which is surrounded by a magnetizable wall and in which a valve body can move, closing a valve opening in the closed position. The magnetic circuit includes at least one intermediate piece made from nonmagnetic material, while the wall and the valve seat consist of magnetizable material. As a result of the valve body being arranged eccentrically or as a result of the intermediate pieces being arranged asymmetrically, the magnetic flux density is increased on one side, so that the valve body moves onwards towards this side from the valve opening.

Abstract: The invention relates to a valve having a closure element which is movable in an inner chamber and closes or clears a valve seat. The closure element is activated by a magnetic assembly in the magnetizable wall surrounding the inner chamber. According to the invention, the closure element has a low density. It comprises a hollow body having at least one activator body made of magnetizable material that is freely movable therein. The closure element has a low weight and a large surface. The large surface facilitates the resetting of the closure element on the valve seat by the action of the flowing medium.

Abstract: A solenoid valve includes at least one armature that is axially displaceable in a valve housing and a valve element that is operatively connected to the armature. The valve element can be arranged by means of the armature to open up or close off at least one valve seat of the solenoid valve. A non-return valve is provided between a first fluid connection and a second fluid connection of the solenoid valve. In so doing, the non-return valve is arranged at least in regions in the armature.

Abstract: A microvalve assembly (10) includes an elongate valve body (14) having opposed first and second major surfaces, the first major surface defining a valve recess (34) and the second major surface defining first and second fluid ports (20,22). Both the fluid input port and the fluid output port extend in fluid communication with the valve recess. A gasket (12) is freely positioned within the valve recess so as to extend in overlying registry with either or both of fluid ports. A valve cover (16) is bonded to the valve body and includes a first planar surface positioned in overlying registry with the valve recess so as to enclose the gasket therein. The valve cover is deflectable into the valve recess so as to cause the gasket to seal at least one of the fluid ports.

Abstract: A pressure control valve device with at least one inlet area and first and second outlet areas which can be connected by two poppet valves. A flow guide device (21), with inflow and outflow areas (22, 23) for guiding the fluid flowing from the inlet area in a defined manner in the direction of the second poppet valve, is located upstream of the second poppet valve, between the first and second outlet areas. The fluid in the flow guide device (21) passes in the area between the inflow and outflow areas (22, 23) through a plurality of channel areas distributed around the periphery of the flow guide device (21) and separated from one another, which are shaped at least approximately helically and impart an at least approximately vortex-like flow pattern to the fluid flowing in the direction of the second poppet valve downstream of the outflow area (23).

Abstract: There is provided a magnetic microvalve using a metal ball and a method of manufacturing the same. A magnetic microvalve using a metal ball according to an aspect of the invention may include: an upper substrate having a microchannel serving as a passage through which a fluid moves, a fluid inlet through which the fluid flows into the microchannel, and a fluid outlet through which the fluid, having passed through the microchannel, flows out of the microchannel; a lower substrate having a trench locally provided therein; a PDMS/metal ball combination having a metal ball and PDMS surrounding the metal ball so that the metal ball is located in a central portion thereof, the PDMS/metal ball combination being inserted into the trench provided in the lower substrate; and a magnet located above the microchannel, provided in the upper substrate, and generating magnetic force.

Abstract: The invention relates to a solenoid valve including an electromagnet (17, 4, 3, 10) made of a flat movable core (10), a fixed core (3) and a coil (17), the solenoid valve comprising a body (4) which also belongs to the electromagnet and includes an opening (23) located at the rear of the body (4), opposite the supply opening (18), for inserting the flat movable core (10), the fixed core (3) and the coil (17). The body (4) is secured to a retaining ring (8) made of a non-magnetic material, a flat spring (9) being compressed between the retaining ring (8) and the flat movable core (10).

Abstract: An electromagnetically operatable valve, in particular a fuel injector for fuel injection systems of internal combustion engines, includes a magnetic circuit having a core, a solenoid, an armature, which operates a valve closing body cooperating with a fixed valve seat and is drawn against the core when the solenoid is excited, and is held on the valve closing body by a closing body carrier representing a part of a valve needle. The spherical valve closing body is secured on the closing body carrier in a non-positive manner due to the shape of the corresponding connecting surfaces. The valve is suitable in particular for use in fuel injection systems of mixture-compressing, externally ignited internal combustion engines.

Abstract: A fuel injector apparatus and method is provided for use in a fuel injection system of an internal combustion engine that includes a body, a valve seat, closure member, and an orifice plate. The valve seat comprises the intersection of two angled surfaces with a radius before assembly of the fuel injector. During assembly of the fuel injector, a member presses against the radius edge of the sealing surface of the valve seat to create an oblique third sealing surface or sealing band that is coined into the valve seat. The sealing band provides an improved seal between the valve closure member and the valve seat which operates to prevent leakages of fuel in the fuel injector.

Abstract: A damping force variable valve includes a retainer having a main body connected at a central portion thereof to a high pressure part or portion of a shock absorber and having an outer peripheral region enlarging outwardly, and a spool rod integrally extending from the central portion and formed at a center thereof with a hollow portion having a spool inserted therein. The variable valve further includes a main disc disposed adjacent the retainer, a solenoid unit provided adjacent the spool rod and including a push rod for moving the spool when electrical power is applied, and an operating block installed adjacent the solenoid unit and including an enlarged portion coupled to the outer peripheral region of the main body.

Abstract: A fluid flow metering device comprises a ball valve locatable in a fluid flow, having at least two transverse bores through the ball valve, a first transverse bore and a second transverse bore. The first transverse bore includes a fluid flow metering apparatus for measuring the rate of fluid flow through the first transverse bore. The ball valve is preferably rotatable between a first metering position where fluid is flowable through the first transverse bore and a second open position where fluid is flowable through the second transverse bore. In addition, the second transverse bore is dimensioned so that a tool is movable through the second transverse bore when the ball valve is in the second open position.

Abstract: A vehicle brake hydraulic pressure control unit including a base body including a brake fluid flow path and a mounting hole portion having a bottom sealing surface and an inner circumferential sealing surface and an assembled part which is assembled into the mounting hole portion so as to communicate with the flow path. The assembled part includes a lower end sealing portion hermetically contacting with the bottom sealing surface of the mounting hole portion to form a lower side sealing portion and an outer circumferential sealing portion hermetically contacting with the inner circumferential sealing surface of the mounting hole portion to form a circumferential sealing portion. A hermetic accommodation space is defined by the lower side sealing portion and the circumferential sealing portion.

Abstract: Solenoid operated fluid control valve for controlling the pressure of a fluid in a fluid control system comprises a solenoid housing having therein a solenoid coil, an armature movable in response to electrical current applied to the solenoid coil, a valve member for controlling fluid flow to a fluid passage, an actuator pin disposed between the armature and the valve member for moving the valve member in response to armature movement, and one or more features including an armature damping member, tubular actuator pin support body, flow diverter, coil bobbin support sleeve, and/or internal particle gettering magnet to improve valve operation.

Abstract: An apparatus for performing multi-dimensional assays using a microfluidic chip is presented. The apparatus comprises of two crossing series of micro-channels on the microfluidic chip. The apparatus further comprises of a plurality of magnetic valves placed at the crossings and a guiding magnet. When an operator places the guiding magnet in a vicinity of the chip, the guiding magnet produces a proximal magnetic field gradient at a location of each of the plurality of magnetic valves. At the first micro-channel crossing, a magnetic valve controls fluid flow in the first micro-channel, and another magnetic valve controls fluid flow in the second micro-channel at the first micro-channel crossing. Each magnetic valve comprises a magnetic bead and a cavity on the chip next to a corresponding micro-channel section.

Abstract: A vacuum solenoid valve may comprise a valve body defining an interior cavity and include a plurality of ports configured to be in fluid communication with the interior cavity of the valve body. One or more valve seats may be disposed about an opening between at least one of the plurality of ports and the interior cavity. One or more valve members may be configured to be moveably disposed within at least a portion of the interior cavity of the valve body and to sealingly engage with the valve member. Either the valve seat and/or the valve member may comprise a material having a higher resistance to wear and erosion compared to valve body.

Abstract: In one embodiment of the present invention, an apparatus for one-step flow control at a micro-channel crossing comprises a first micro-channel and a second micro-channel, a plurality of magnetic valves, and a guiding magnet. The guiding magnet produces a proximal magnetic field gradient at a location of each of the plurality of magnetic valves when an operator places the guiding magnet in a vicinity of the chip. The vicinity of the chip comprises a plurality of guiding magnet position ranges. The operator repositions guiding magnet in order to actuate the plurality of magnetic valves simultaneously. Depending on the position of the guiding magnet, the passages are blocked or unblocked to stop or let the fluid flow in a given crossing.

Abstract: In one embodiment as described in this section, an apparatus for mixing of microfluidic streams on a chip is presented, which comprises a micro-channel and a plurality of magnetic valves on the chip. A guiding magnet produces a proximal magnetic field gradient to exert a force on a bead in a cavity when placed at in a vicinity of the chip. The bead-cavity combination form a magnetic valve. In one embodiment, the mouth of the cavity is tapered so to prevent the magnetic bead from completely blocking the corresponding micro-channel section to enhance the mixing of microfluidic streams at the narrowed fluid path. In one embodiment, magnetically actuated valves direct the flow in a microfluidic system in one of several flow paths wherein the mixing characteristics of the paths are different.

Abstract: The invention relates to a ball poppet valve, in particular an electromagnetically actuated ball poppet valve, having a valve body, an accommodating aperture disposed in the valve body for a ball poppet, and a valve bore also disposed in the valve body, a ball poppet for closing the valve bore and a control stem acting on the ball poppet. The accommodating aperture of the valve body, starting from a cylindrical wall part of constant diameter in which the ball poppet sits, widens at an end opposite the control stem in at least approximately a funnel shape.

Abstract: A stemless ball valve comprising two flanges and a ball with a channel, two axis pins and two travel pins. One end of each axis and travel pin is fixedly attached to the ball, and the other end of each axis pin is lodged into a notch in the first or second flange such that the axis pin is allowed to rotate in the notch. The guide sleeve comprises two channels, and one end of each travel pin is situated within one of the two channels in the guide sleeve. An outer magnetic cartridge causes the inner magnetic cartridge and guide sleeve to rotate, and when the guide sleeve rotates, the travel pins move up and down within the channels in the guide sleeve. The movement of the travel pins within the channels in the guide sleeve causes the ball to rotate, thereby opening and closing the ball valve.

Abstract: An HVAC actuator, such as a spring return actuator, may adjust the maximum output torque of the motor with the varying spring return force of the HVAC actuator as the HVAC actuator moves through its range of motion. In some cases, this may provide a more constant force at the output of the HVAC actuator and reduce the force that is applied through the motor, drive train and/or the HVAC component when an end stop is reached. Also, an HVAC actuator is disclosed that can be configured to discover and store the location of one or more end stop(s), and to slow the speed of the motor down before the end stop(s) is reached. This may reduce the force that is applied through the motor, drive train and/or the HVAC component when an end stop is reached.

Abstract: A valve including a shutter placed in a chamber which is arranged in the valve body and whose end is provided with a seat against which a plug-forming part of the shutter is pressed in the closed position of the valve and is remote in the open position thereof. The inventive valve also includes a magnetic control device provided with the shutter magnetic drive device disposed outside the chamber and displacing the shutter in the closed or open position thereof. The valve is characterized in that the magnetic control device includes at least one ball which is made of a magnetic material, disposed in the chamber and is coupled with an external magnetic drive device, wherein the ball is associated with the shutter in such a way that the shutter is driven in the chamber when the ball is moved by a magnetic drive device.

Abstract: Solenoid valve for controlling the flow of a fluid in a hydraulic circuit, comprising a valve body having at least one fluid duct, a stopper for allowing or preventing the flow of fluid in the fluid duct, a mechanical connection to actuate the stopper, an electromagnetic actuator arranged to actuate the mechanical connection, and a coupling between the electromagnetic actuator and the valve body via a jacket surrounding the electromagnetic actuator and engaged on a shoulder of the valve body. The jacket holds the electromagnetic actuator in axial engagement against the valve body in a direction of engagement. The shoulder comprises two matching half-washers engaged radially in a peripheral groove of the valve body.

Abstract: Proportional pressure control valve with a magnetic part and a valve part, the valve part has an inflow opening for the inflow stream, a first outflow opening for the filling stream, and a second outflow opening for the tank volume stream, and has a ball seat, a flat seat with an opening, a closing part for controlling the throughput quantity through the opening of the flat seat, and a stream diverter. The inflow opening faces away from the magnetic part and coaxially to its longitudinal axis, and the outflow openings are constructed on the side wall of the valve part radially to its longitudinal axis, so that fluid flowing from through the valve is exposed to a diversion of a maximum of 90°. The fluid, after flowing through the ball seat and to and through the stream diverter, experiences a diversion of less than 30°.

Abstract: An electromagnetic pressure regulating valve has a valve portion for conducting and regulating the pressure of an operating medium, such as oil, a magnet portion for actuating the valve portion for regulating the pressure of the operating medium and having a magnet housing, in which a magnet core is located that as needed exerts magnetic force on an armature, located in the magnet housing, a spring with a spring force generating a pressure activation threshold to be overcome upon regulation and located between the armature and an adjusting ball that is located in a pole piece of the magnet housing, and the spring has regions of different diameter.

Abstract: A pressure control valve having valve seats, an electromagnet, a magnetic coil, and an armature coupled to an anchor rod, which are axially slidable for biasing a part against a first valve seat to close a tank edge. A push rod, which is integral with the anchor rod, biases a locking element off a ball seat to open an inlet control edge. The cross-section of the inlet control edge can be modified depending on the temperature such that the cross-section is opened as widely as possible at low oil temperatures. The cross-section of the inlet control edge is reduced at high oil temperatures to the extent that a high valve dynamic of the follow-up slide valve is achieved, and the leakage oil flow is not significantly increased.

Abstract: A fuel injector for fuel-injection systems of internal combustion engines includes a valve-closure element cooperating with a valve seat, and a restoring spring which is situated in a spring pocket opening and acts upon the valve-closure element by a restoring force in the direction of the valve seat. The restoring spring has at least one holding coil in a region of the inflow side, whose area of cross section is positioned perpendicular to an area of cross section of the restoring spring.

Abstract: The valve comprises a closing body in a valve chamber. The valve chamber is delimited on one end by an opposing wall and on the opposite end by a piston. The piston is pressed in the direction of the opposing wall by a press-on means. In this manner, the closing body is pressed against a centering seat axially aligned with the valve seat. The press-on means makes it possible that the valve will reliably close also in case of a small pressure differential between the valve inlet and the valve outlet.

Abstract: A pushrod is slidably received in a slidably holding guide, which is formed separately from a valve body of a valve apparatus. A clearance is provided between an inner peripheral surface of a small diameter tube portion of the valve body and an outer peripheral surface of the guide. The clearance is provided to absorb deformation of the small diameter tube portion.

Abstract: The magnetically actuable valve has an interior space which is surrounded by a magnetizable wall and in which a valve body can move, closing a valve opening in the closed position. The magnetic circuit includes at least one intermediate piece made from nonmagnetic material, while the wall and the valve seat consist of magnetizable material. As a result of the valve body being arranged eccentrically or as a result of the intermediate pieces being arranged asymmetrically, the magnetic flux density is increased on one side, so that the valve body moves onwards towards this side from the valve opening.

Abstract: A solenoid control valve is described wherein the valve employs a precision molded plastic valve seat member, a corresponding control valve body which includes flying buttresses for supporting and distributing loads on the control valve body, and armature vent features.

Abstract: A circulation tool 10 for use downhole in a well includes a housing 12 having one or more bypass ports 16 for circulation between a bore in the housing and an annulus surrounding the housing. A sleeve 68 is axially movable within the housing, and axially spaced seals 70, 74 seal between the sleeve and the housing when the sleeve is in the closed position. A ball 52 is rotatably mounted to the sleeve, and includes a seat 54 about a central bore 55 in the ball for engagement with a plug. When the sleeve closes off the circulation ports 16, the ball is rotated to the open position with a substantially full bore diameter.

Abstract: An apparatus is provided for a valve assembly comprising a valve element movable between open and closed positions, a valve seat, a valve guide, and a plurality of vents. The valve seat has a valve seat surface against which the valve element seats when in the closed position, and a valve seat passage extending therethrough. The valve guide is coupled to the valve seat, and has at least an inner surface and an outer surface. The valve guide inner surface defines a valve guide passage that is at least substantially aligned with the valve seat passage. The plurality of vents are formed between the valve guide inner and outer surfaces, and are in fluid communication with the valve guide passage within which the valve element moves. Each of the vents is disposed radially outward of the valve element.

Abstract: In a vehicle solenoid valve, the spool that holds the actuation coil is formed with a hexagonal or octagonal inner chamber in which a cylindrical armature can slide. Owing to the different cross-sectional shapes between the spool and armature, a longitudinal fluid vent passageway is established along each edge of the chamber between the non-cylindrical walls of the chamber and the cylindrical armature so that movement of hydraulic fluid relative to the armature is promoted when the armature moves. The face of the spool that is oriented toward the valve end can be formed with radial vent grooves to further facilitate fluid venting when the armature moves.

Abstract: A pulse width modulated solenoid control valve is described, wherein the valve includes a polymer fluid control body. The body includes a segmented fluid flow path for providing strength to the fluid control body assembly. Stand off ribs are provided to improve assembly into a control manifold. A casing forms an integral flux tube. A tapered push rod is used to reduce flux shorting.

Abstract: A pressure control valve for an automatic transmission of a motor vehicle includes a valve unit (10) extruded from plastic, which is disposed coaxially to an actuator unit and serves for control of a fluid flow between a supply port (18) and a consumer port (16) and in which fluid channels (24, 26) and a valve chamber (30) are formed, in which a valve closing member is arranged. The fluid channels (24, 26) and the valve chamber (30) are formed on an injection-molded preform (22), which is injected into a flange (12).

Abstract: A valve device including a valve chamber having an inlet port at one end and a valve seat at the other end; a valve housing containing the valve chamber; the valve chamber accommodating a spherical valve element which performs opening and closing operation to the valve seat, and a valve spring which urges the valve element in a closing direction; and a push rod which penetrates a center hole of the valve seat and pushes the valve element in an opening direction. A cylindrical valve guide member is fit into the valve chamber, the cylindrical valve guide member including a plurality of guide projections on an inner peripheral surface to guide opening and closing operation of the valve element. Grooves between the plurality of guide projections serve as passages providing communication between the inlet port and the valve seat.

Abstract: A bistable electromagnetic valve is proposed, which is to be used in refrigerant circuits. The valve can be produced at particularly low outlay and at the same time is reliably leaktight. This is achieved, according to the invention, in that the valve chamber (7) is formed within a control coil (3) by a cylindrical tubular body (2) which extends at least beyond the pole pieces (5, 6) inserted into the cylindrical tubular body (2).

Abstract: Provided is an electromagnetic valve improved in terms of the sealing property of a shut-off valve with respect to a valve seat.

Abstract: An automatic flush actuation apparatus, which is incorporated with a flushing system having a water inlet, a water outlet, and a water chamber communicating therebetween, that includes a valve member being moved by a flush lever for releasing the water pressure within the water chamber to allow the water passing from the water inlet to the water outlet, and a sensor-operated powering assembly including a relief valve provided at the valve member for controlling the water flowing to the water outlet and an actuator arranged in such a manner that while sensing a presence of a user of the flushing system, the actuator is driven to move the relief valve to an opened position for releasing the water pressure within the water chamber to allow the water passing to said water outlet.

Abstract: In a proportional solenoid valve, a cylindrical valve seat member includes an input/output-side passage provided between an input port and a drain port and between an output port and the drain port, a seat portion provided in an end portion of the input/output-side passage, and a drain-side passage provided between the seat portion and the drain port. The drain-side passage is formed by exhaust passage holes whose number is an even number equal to four or more and which are arranged at regular intervals in the circumferential direction of the valve seat member.

Abstract: In a proportional solenoid valve, a solenoid main body includes a coil, a valve seat member having a seat portion, a valve element that is displaced in accordance with a current applied to the coil so as to be brought into and out of contact with the seat portion, and a valve guide portion that is arranged coaxially with the seat portion and guides the displacement of the valve element. The housing is attached to the solenoid main body so that a space is formed between the housing and the valve seat member. A seal member made of an elastic material is provided in the space between the housing and the valve seat member.