Abstract: A proportional solenoid comprises a rotary magnet for causing a rotational displacement within an angle of 180 degrees in proportion to a current supplied to a coil, a torsion bar for damping the rotation of the rotary magnet and a rotary valve driven by the rotation of the rotary magnet.

Abstract: A device for detachably coupling the orifice of a branchline to a line carrying a pressure medium and having a plurality of discharge valves spaced apart from each other in the line wall, the coupling being carried out by means of a coupling device which is movable over the length of the line and contains the orifice and opens one of the discharge valves. The discharge valves are mounted in the line with magnetically actuating opening members and the coupling device is provided with a coupling element guided thereon and is provided with an automatically sealing coupling member in the coupling position with the discharge valve at the pressure side for an automatic alignment with the orifice, and an actuator which magnetically cooperates with the opening member and the coupling member.

Abstract: An improved valve prosthesis for causing non-traumatic unidirectional flow of a pulsatory fluid, such as blood, through a conduit, such as a blood vessel by means of magnetic force. The valve may include two flaps, made of a suitable flexible material, attached by the proximal ends to opposite sides of a covered annular mounting structure. A pair of magnetic members are connected to the distal ends of the flaps thereby to exert either repulsive or attractive force to permit the smooth, non-traumatic closure of the valve flaps. If repulsive force is used, the opposite sides are prevented from impacting traumatically. In another embodiment a pair of rigid flaps are mounted for pivotal movement along a common diametrical line and prevented, by magnetic repulsive force, from impacting traumatically in either the closed or open positions.

Abstract: A three-way valve device or the like having valving that is operably disposed within a bushing contained in the housing of the valve device, and a permanent magnet that is disposed in surrounding relationship with the bushing so as to be operable along the axial dimension thereof from an inactive position that is magnetically remote from a movable member of the valving to an active position that is in magnetic proximity with the movable valve member, to thereby shift the valve member and accordingly control fluid pressure communication between the valve porting with snap action. In one embodiment of the invention, the permanent magnet is operated by a push-button against the action of a spring, and in a second embodiment, the permanent magnet is encapsulated within a fluid-pressure-operated member subject to fluid pressure on it opposite sides.

Abstract: A magnetic flux-shifting or magnetic latch valve includes a first flux path including a first permanent magnet having a large coercive force so that its polarity cannot readily be altered. It further includes a second flux path including a second permanent magnet having a small coercive force so that its polarity can be altered. A valve according to this invention further includes a d-c source and a winding energized by said d-c source for altering the polarity of said second magnet.The fluid valve includes a valve element and a valve seat cooperating with the valve element. The valve has two limit positions, i.e. fully open and fully closed. In the fully closed position the pole surfaces of magnetic flux paths have the same magnetic polarity and hence do not attract each other permitting gravity, spring or hydrostatic means to form a gap therebetween.

Abstract: An axially magnetized cylindrical permanent magnet has a valve plug projection at one end for seating in a valve seat. It moves axially within a cavity, provided by two cup cores of ferromagnetic material, which is bisected by a medium ring that has an aperture allowing the permanent magnet to slide within it. Each cup core has a re-entrant central pole, one of which carries the valve seat and is bored to provide one valve port. Windings between the re-entrant poles and the core shells are concurrently energized in such a way as to produce like poles at the re-entrant pole faces, so that one will repel the permanent magnet and the other will attract it. A pulse of current is sufficient to open or close the valve and may be followed by a reverse pulse to brake the plug in order to reduce wear. The permanent magnet force holds the plug in either end positon when there is no current.

Abstract: A magnetically locked fluid valve having a particular utility in a fire hydrant to prevent unauthorized usage thereof. The fire hydrant includes an operating nut mounted on top of one end of a hydrant actuator shaft, and a magnetic lock is located in immediate proximity thereto. A shaped magnet is adapted to be placed around the actuator shaft adjacent to the magnetic lock, after which a wrench can be applied to the operating nut to control operation of the fire hydrant. The magnetic lock includes magnetic tumblers which are shifted in position in response to placement of the magnet on the actuator shaft. The actuator shaft includes an upper section coupled to the operating nut and a lower section coupled to the hydrant valve. The magnetic lock is positioned between the upper and lower shaft sections, and the upper shaft section is freely rotatable relative to the lower section when the magnet is removed, but is locked relative thereto when the magnet is positioned thereon.

Abstract: A handle for a magnetically actuated valve which bears rotating and fixed indicia for reading the valve position. The rotating indicia is placed upon a jacket carrying drive magnets. The fixed indicia is placed upon a cap covering the exposed end of a nonmagnetic bonnet separating the drive and driven magnet assemblies. External stop means prevent rotation of the jacket relative to the cap and bonnet more than about 90.degree.. Internal stop means prevent the rotation of valve and driven magnets more than about 90.degree..

Abstract: A magnetically resettable emergency shutoff valve (10) is disclosed. A valve member (26) shifts into a seat (28) and blocks flow of a fluid, such as natural gas, through the valve (10) in response to a seismic event of a selected magnitude. Movement of a magnet (32) externally of the valve (10) leads to movement of the ferromagnetic valve member (26) away from the seat (28).

Abstract: This invention relates to a rising stem valve that is magnetically actuated. A driven magnet assembly is rotatably supported in a nonmagnetic pressurizable bonnet fixed to the main valve body. The driven magnet assembly preferably comprises rare earth cobalt magnets defining an even number of north and south poles. A cylindrical holder coaxial with and surrounding said tubular bonnet is rotatably secured thereto. The holder carries driving magnets, preferably rare earth cobalt magnets with an even number of north and south poles. Rotation of the holder results in rotation of the driven magnet assembly. A valve stem is connected to the driven magnet assembly in a manner such that turning of the driven magnet assembly raises and lowers the stem which in turn opens and closes the valve.

Abstract: A flow control valve for mounting on the intake manifold of an internal combustion engine for controlling a by-pass passage supplying air to the intake manifold of the engine by operating a solenoid in response to output signals from an O.sub.2 sensor located in the exhaust manifold. A casing which is mounted on the intake manifold to form the by-pass passage is interiorly provided with a movable member which is operated by energization and de-energization of the solenoid and biased to abut against a fixed member in the casing by the action of a first spring when the solenoid is in the de-energized state. Further provided in the casing are a slide member which is slidable along the fixed member and a pressure chamber defined by the diaphragm one peripheral edge of which is secured to the slide member, the pressure chamber being communicated with the intake manifold to receive the intake manifold vacuum therein.

Abstract: A magnetically actuated pilot valve for fluid control systems which can direct a fluid pressure for operating a device or it can connect said device to drain.

Abstract: A magnetically-operated valve has a body provided with a passageway therethrough. A piston is mounted on the body for sliding movement toward and away from a valve seat. The piston has a magnetic pole at one end. A magnet is mounted on the body for movement between a first position, at which the piston will be held in a flow-permitting position, and a second position, at which the piston will sealingly engage the seat to terminate such flow. An override mechanism may be operated to displace the piston against the repulsive forces between like poles.

Abstract: A fuel supplying apparatus comprises a fuel supplying nozzle having an ejection pipe for ejecting fuel and a supplying passage for supplying the fuel to the ejection pipe, an opening and closing valve provided in the supply passage, a nozzle lever for opening the opening and closing valve, locking mechanism for locking the opening and closing valve in an open state, negative pressure generating mechanism for generating negative pressure upon supply of the fuel outside through the ejection pipe, lock releasing mechanism for releasing the lock of the locking mechanism by the introduction of the negative pressure generated by the negative pressure generating mechanism, atmosphere introducing mechanism for introducing atmosphere into the lock releasing mechanism to neutralize the negative pressure, solenoid valve for interrupting the introduction of the atmosphere by the atmosphere introducing mechanism when no current is introduced, and allowing the introduction of the atmosphere by the atmosphere introducing me

Abstract: This invention relates to force motors that are used in single stage hydraulic valves that are responsive to electrical input signals. The inertia of the force motor is reduced by having only a small portion of the force motor move. By reducing the mass of the moving parts of the force motor the force motor may be used with an increased speed of response.

Abstract: A device for the regulation of the flow area of a valve having an inner magnet (32) moveably mounted on a valve plug (22) to move the valve plug (22) in an axial direction, and an outer magnet (28) moveably mounted to the valve housing to move the inner magnet (32) and consequently the valve plug (22) as the outer magnet (36) is moved.

Abstract: A three-way valve device or the like having valving that is operably disposed within a bushing contained in the housing of the valve device, and a permanent magnet that is disposed in surrounding relationship with the bushing so as to be operable along the axial dimension thereof from an inactive position that is magnetically remote from a movable member of the valving to an active position that is in magnetic proximity with the movable valve member, to thereby shift the valve member and accordingly control fluid pressure communication between the valve porting with snap action. In one embodiment of the invention, the permanent magnet is operated by a push-button against the action of a spring, and in a second embodiment, the permanent magnet is encapsulated within a fluid-pressure-operated member subject to fluid pressure on its opposite sides.

Abstract: A control device for a solenoid valve including a valve body provided with a fluid inlet and fluid outlet ports, a valve member provided in the valve body and movable between a closed and open positions and a solenoid coil for electromagnetically actuating the valve member. The control device includes a switching circuit which is adapted to alternatively direct an energizing electric current to the solenoid coil in one direction so that the valve member is moved toward the open position and in the opposite direction so that the valve member is maintained in the closed position. Since the valve member is maintained in the closed position by the electromagnetic force, it is possible to prevent the valve member from being moved out of the closed position even under vibrations to which the valve may be subjected in use.

Abstract: A fluid shut-off device is provided which comprises a magnetic valve body provided in a non-magnetic hollow casing for movement between a first position to open a fluid passage and a second position on a valve seat to close the passage, and an annular permanent magnet provided outside the casing and urged toward the periphery of the valve seat by an elastic spring. The valve body is normally held in the first position but is allowed to move to the second position by the magnetic force of the permanent magnet at a predetermined condition.

Abstract: A magnetically actuated pilot valve for fluid control systems which can direct a fluid pressure for operating a device or it can connect said device to drain.

Abstract: An electrically operated fluid control valve unit is associated with a moving-coil linear motor which includes the quantity of fluid flow across the tubular core, a permanent magnet for providing magnetic flux through the tubular core, a permanent magnet for providing magnetic flux through the tubular core, a moving-coil wound on the bobbin across the magnetic flux of the magnet to provide a linear force on the bobbin, and a pair of conductive springs connecting the moving-coil to an electric control circuit and biasing the bobbin toward its initial position. Each of the springs is insulated from one another and from the valve housing, the tubular core and the like to prevent from unexpected short of the springs.

Abstract: A hydraulic pilot valve having an improved detent mechanism. The pilot valve includes a pair of lever operated plunger members which operate sliding valve members to control the opening and closing of a pair of work ports. Biasing members urge the plunger members to an extended position so as to maintain contact with the lever, and a pair of detent mechanisms act to hold the respective plunger members in the extended position. Movement of the lever to depress either of the plunger members and thus operate the respective valve members to open either of the work ports allows the respective biasing member to move the other plunger member to its extended position where it is held in place by its respective detent mechanism, thus holding the lever in its cocked position.

Abstract: An accumulator device is characterized in the provision of plural mechanisms for maintaining the oil port sealing valve member in open position, one said mechanism comprising a spring and the other comprising a control device member which may be activated to its valve stem releasing condition responsive to pressure drops of a predetermined magnitude or after a predetermined time interval.

Abstract: A packless magnetically actuated valve. A driven magnet assembly is rotatably mounted inside a nonmagnetic bonnet. A drive magnet holder surrounds the bonnet and rotates thereon. The driven magnet assembly turns a stopper positioned in the main valve body between inlet and outlet passages. The bonnet is mounted for rotation and means extend between the bonnet and the driven magnet assembly such that sufficient rotation of the bonnet will cause rotation of the stopper.

Abstract: This invention is an electrically controlled single stage hydraulic valve in which the valve spool is moved along the valve sleeve by a small force motor. The valve has spool to sleeve centering devices on the periphery of the spool which reduce friction between the spool and the sleeve by automatically centering the spool in the center of the valve's sleeve. The aforementioned valve also employs (1) stabilizing devices that prevent the valves from responding to acceleration of the vehicle in which the valve is traveling and (2) anti flow force device to reduce necessary actuating force to negligible value.

Abstract: A bi-directional filter/drier for use in a heat pump refrigerant system or the like. The filter/drier includes a cylindric filter/drier element fitted within a housing and having an axial bore therethrough. The housing has an inlet/outlet at each end thereof for connection to the refrigerant system of the heat pump for selective bi-directional flow of refrigerant therethrough. A valve assembly is provided in the housing at each end of the filter/drier element. Each valve assembly includes a flapper valve and an outlet popet valve with the flapper valves permitting refrigerant to flow from a respective inlet/outlet functioning as an inlet to the exterior of filter/drier unit and with the outlet valves permitting the refrigerant to flow from the interior bore of the filter/drier element to a respective inlet/outlet which functions as an outlet so that no matter which direction refrigerant flows through the housing, the refrigerant at all times flows from the exterior to the interior of the filter/drier element.

Abstract: A self-actuating, self-locking flow cutoff valve particularly suited for use in a nuclear reactor of the type which utilizes a plurality of fluid support neutron absorber elements to provide for the safe shutdown of the reactor. The valve comprises a substantially vertical elongated housing and an aperture plate located in the housing for the flow of fluid therethrough, a substantially vertical elongated nozzle member located in the housing and affixed to the housing with an opening in the bottom for receiving fluid and apertures adjacent a top end for discharging fluid. The nozzle further includes two sealing means, one located above and the other below the apertures.

Abstract: The present invention is an electrically controlled valve (10) that includes an elongated valve body (38) with an axial passageway (48) disposed along the elongation axis (44) thereof. The valve body (38) has at least one inlet passageway (52) and at least one outlet passageway (56, 58) in fluid communication with the axial passageway (48). The valve (10) includes structure (60, 62) for establishing a static magnetic field within the valve body and axial passageway. The valve member (90) is mounted within the axial passageway (48) for reciprocation therein to selectively establish fluid communication between the inlet and outlet passageways of the valve body. The valve member (90) has at least a portion thereof formed of material that is magnetizable and of relatively low permeability.

Abstract: A magnetically actuated pilot valve for fluid control systems which can direct a fluid pressure for operating a device or it can connect said device to drain.

Abstract: The solenoid actuated valve device is comprised of a housing of magnetic material having a radially disposed inlet and at least one axially disposed outlet in communication with the interior of a hollow magnetic core disposed within the body. An annular bobbin having a solenoid coil wound thereon is slidably mounted on the core and is normally biased into a position closing at least one elongated radially extending opening through the core. Permanent magnets are secured to the interior of the body in such a manner that the lines of flux intersect the solenoid coil at right angles thereto. Two springs normally bias the bobbin to the closed position and extend between one end of the bobbin and a spring support member disposed adjacent one end of the body.

Abstract: An electromagnetically controlled pneumatic valve includes a chamber having a first nozzle of magnetic material in opposed relation to a second nonmagnetic nozzle. A cylindrical, permanent magnet, valve member may become seated upon one or the other of the nozzles in response to an electromagnetic field generated by a coil surrounding the first nozzle. A conduit from the chamber between the nozzles connects to a pneumatic load such as an air tool.

Abstract: A torque transmitting assembly for effecting rotation of a valve member such as a butterfly valve is hermetically sealed to the valve housing. It includes a rotor member having a plurality of circumferentially spaced permanent magnets of opposite polarity and a driver magnet assembly having a like plurality of circumferentially spaced permanent magnets of opposite polarity facing the magnets mounted to the rotor. The two sets of magnets are separated by a stainless steel separator which hermetically seals the rotor. The driver magnet assembly is rotatable about the separator so that magnetic coupling forces effect a following rotation of the rotor and hence of the valve member. A magnetic indicator may be used to identify the rotational position of the rotor. The entire assembly is hermetically sealed and no packing is required. The assembly is especially useful to control a valve in a hazardous environment wherein no leakage of the fluid being controlled by the valve member is permissible.

Abstract: A temperature sensitive valve in which the annular valve seat is made of a thermal sensitive magnetic material having a Curie temperature that is of a preselected value. A vertically movable valve plug is positioned below the valve seat and contains a permanent magnet which normally urges the plug up into the valve seat to close the valve, but which allows the valve to open when the temperature of the valve seat exceeds the Curie temperature.

Abstract: The device is especially intended for a pipe supplying a fluid which must be supplied, simultaneously or alternately, with another fluid. The device comprises a tank for a control fluid which surrounds the vertical supply pipe and in which a permanent magnet moves in accordance with the amount of control fluid contained in the tank. The magnet shifts a valve member inside the supply pipe so that the valve member closes the latter in one of the end positions of the magnet. The magnet is rigid with a float which freely extends around the supply pipe. The device can in particular ensure that fuel is supplied to an engine only if oil is supplied to the latter.

Abstract: An armature of magnetizable material is mounted within a magnetic housing by means of a pair of Belleville springs so that the armature is movable along the central axis thereof between opposed pole pieces formed in the housing. A radially magnetized permanent magnet is positioned in the housing concentric with the armature and a single actuator coil is positioned in the housing concentric with one of the pole pieces. The armature is held in engagement with one of the pole pieces by the flux of the permanent magnet. When the coil is energized the armature is moved into engagement with the opposite pole piece against the biasing force of the Belleville springs, in which position one valve element is closed and the other valve element is opened. The armature pole faces and the pole pieces within the housing have a configuration such that when the armature is in the coil energized position the magnetic permeance of the armature with respect to each pole piece is substantially equal.

Abstract: This invention relates to a shifting stem metering valve that is magnetically actuated. A driven magnet assembly is rotatably supported in a nonmagnetic pressurizable bonnet fixed to the main valve body. The driven magnet assembly preferably comprises rare earth cobalt magnets defining an even number of north and south poles. A cylindrical holder coaxial with and surrounding said tubular bonnet is rotatably secured thereto. The holder carries driving magnets, preferably rare earth cobalt magnets with an even number of north and south poles. Rotation of the holder results in rotation of the driven magnet assembly. A stepping motor or the like controls the rotation of the driven magnet assembly. A valve stem is connected to the driven magnet assembly in a manner such that turning of the driven magnet assembly shifts the stem which in turn adjusts the valve opening.

Abstract: A device for detachably coupling the orifice of a branchline to a line carrying a pressure medium and having a plurality of discharge valves spaced apart from each other in the line wall, the coupling being carried out by means of a coupling device which is movable over the length of the line and contains the orifice and opens one of the discharge valves. The discharge valves are mounted in the line with magnetically actuating opening members and the coupling device is provided with a coupling element guided thereon and is provided with an automatically sealing coupling member in the coupling position with the discharge valve at the pressure side for an automatic alignment with the orifice, and an actuator which magnetically cooperates with the opening member and the coupling member.

Abstract: An electromagnetically operable control valve mechanism of linear motor type adapted for vehicle emission control devices, comprising a single common inlet port, two outlet ports, an electric linear motor and a valve member operatively connected to the motor and commonly disposed on two paths connecting the outlet ports with the inlet port. The control valve mechanism alternately communicates the outlet ports with the inlet port in response to and in proportion to an electric current supplied to the motor.

Abstract: The solenoid actuated valve device is comprised of a substantially cylindrical housing of magnetic material having a hollow tubular core of magnetic material disposed coaxially therein. The ends of the housing are sealingly closed by end walls of magnetic material and the housing is provided with a radially disposed inlet port and an axially disposed outlet port in communication with the central chamber of the tubular core. An annular bobbin having a solenoid coil thereon is slidably mounted on the tubular core for opening and closing the radially disposed openings through the core. A pair of springs extending between the end of the housing and the bobbin normally bias the bobbin into closing position relative to said openings with each spring being connected to one end of the coil and an electric terminal, respectively.

Abstract: A packless magnetically actuated stopper valve. A driven magnet assembly is rotatably mounted inside a nonmagnetic bonnet. A drive magnetic holder surrounds the bonnet and rotates thereon. The driven magnet assembly turns a stopper positioned in the main valve body between inlet and outlet passages. Floating valve seats associated with each passage sealably engage the stopper.

Abstract: An electromagnetic locking type actuator is constituted by a control member reciprocatable in a fluid passage to control the fluid pressure in the passage, an electromagnetic device for applying a first magnetomotive force to the control member, and a magnetic device for always applying a second magnetomotive force to the control member. In the actuator, when an electric current in one direction is applied to the electromagnetic device the first and second magnetomotive forces are added to move the control member in an attracting direction so that the control member is attracted and held at its movement terminating position by the magnetic device even after the first magnetomotive force no longer acts at that position. When an electric current in a direction opposite to the one direction is applied to the electromagnetic device the first and second magnetomotive forces cancel each other thereby maintaining said control member in a magnetically released state.

Abstract: A command signal drives a carburetor metering valve to provide the carburetor fuel flow which will establish a desired air-fuel ratio; simultaneously, the command signal drives a control unit which purges fuel vapor from a fuel vapor storage region. The control unit minimizes purge flow when either maximum fuel flow or minimum fuel flow is commanded and maximizes purge flow when an intermediate fuel flow is commanded; accordingly, fuel vapor is purged from the vapor storage region only when the purge flow cannot unduly enrich or unduly lean the mixture.

Abstract: A closure member comprises a casing having a plurality of stripe recesses as fluid passages, a valve seat inserted in said casing having a flange portion for sleeving a ring magnet and a high strength material adopted on the flange portion, a piston made of metal or magnetic material to be attracted by the ring magnet, an inner tube inserted in said casing having a central fluid passage, a plurality of supports for positioning the piston and a plurality of stripe protrusions coincident with the stripe recesses of the casing and a base cover attaching to the casing.

Abstract: This invention relates to a rising stem valve that is magnetically actuated. A driven magnet assembly is rotatably supported in a nonmagnetic pressurizable bonnet fixed to the main valve body. The driven magnet assembly preferably comprises rare earth cobalt magnets defining an even number of north and south poles. A cylindrical holder coaxial with and surrounding said tubular bonnet is rotatably secured thereto. The holder carries driving magnets, preferably rare earth cobalt magnets with an even number of north and south poles. Rotation of the holder results in rotation of the driven magnet assembly. A valve stem is connected to the driven magnet assembly in a manner such that turning of the driven magnet assembly raises and lowers the stem which in turn opens and closes the valve.

Abstract: A vacuum breaker for use on a moving tank for allowing atmospheric air to enter the tank to relieve a reduced pressure condition in the tank. The vacuum breaker has a light-weight closure assembly including a closure member of relatively large area. The closure assembly is normally held closed by permanent magnets. The magnets and the light-weight construction of the closure assembly substantially prevent the vacuum breaker from opening due to vibration of the moving tank. However, the vacuum breaker opens readily in response to a relatively slight reduced pressure in the tank because of the large area of the closure member. The permanent magnets are shielded from undesirable proximity of ferrous objects to prevent the magnets from being drained. The vacuum breaker may be opened manually to test for a positive pressure condition in the tank.

Abstract: A valve intended primarily for use on the end of a supply hose for directing and controlling a high velocity stream of an abrasive granular material against an object. The valve has a handle with a usual discharge nozzle mounted on one end thereof, with the granular material supply hose being connected to the other end of the handle. A lever is pivotally mounted on the handle and is movable between open and closed positions with respect to the nozzle. The lever has a hand-actuated inner end portion and a nozzle sealing outer end portion. A spring is mounted on the lever and biases the lever toward closed position. A resilient sealing member is mounted on the outer end of the lever and forms a seal completely external of the nozzle against the open discharge end of the nozzle when the lever is in closed position. Magnets may be mounted on the handle and inner end of the lever and are mutually engageable when the lever is in open position to assist an operator in overcoming the biasing effect of the spring.

Abstract: The specification of the present invention discloses an automatic bottle cap that may be applied to an opened receptacle. The valve used in this cap automatically opens when the receptacle is tipped for pouring and closes when the receptacle returns to the upright position. The device uses two permanent magnets positioned such that a net unbalanced force exists between them which is used to open or close the valve. The movement of one magnet within the structure causes the direction of the net unbalanced force to be reversed causing the second magnet and associated valve stem to move and open or close the valve.

Abstract: The present invention relates to a controllable thread extractor with an air passage connected to a vacuum source which includes a shaft passageway perpendicular to the air passage dividing the air passage into two sections, a ball is received in the shaft and means for actuating the ball to selectively open and close the air passage.

Abstract: A magnetic latch for a pressure or vacuum relief valve is disclosed. The pressure or vacuum relief valve includes a cover hingedly connected to a body and a valve seat defined on the body. The latch includes a housing having an open end and connected to either the valve cover or the body. A magnet is mounted within the housing. A striker plate is connected to the other of the valve cover or body in a position to engage the open end of the housing and to be spaced by a gap from the magnet in the valve closed position. The gap between the striker plate and the magnet is adjustable by varying the position of the housing relative to its mounted position. A spring is positioned between the striker plate and the cover or body and biases the striker plate toward the housing in the valve closed position to provide self-alignment and via its adjusting screw to ensure proper engagement of the striker plate with the open end of the housing.

Abstract: A device for preventing backfire of inflammable gases comprising a cylinder, a balance spring, and a repelling magnet case. The cylinder holds both a valve casing whose rear edge shuts a gas induction passage when the casing is pushed backward by high pressure, and a check valve which contains a repelling magnet and which shuts and opens a gas supplying passage and a flow-way formed in the valve casing. The repelling magnet case, which is pushed backward by the balance spring, contains a repelling magnet aligned face-to-face with a magnet that is contained in the check valve.