Abstract: A discharge device for a bag-making, filling and packing apparatus which consists of a bag-making cylinder around which packing film is wound for making a bag and through which commodity article is filled in the bag after the bag is feeded to the lower position consists of magnets for opening and closing movable covers which are provided at the discharge end of the bag-making cylinder. The magnets can be permanent magnets which are movable toward and away from the covers or electromagnets which are stationarily mounted adjacent the covers.

Abstract: Generally speaking, the present invention relates to an electromagnetic valve for subsea applications. It comprises a valve body, a rotatable core (with an aperture) located within the valve body (it may be shaped like a plug or a ball), a means for creating a magnetic field located between the valve body and the core and electrically conductive windings wrapped around the rotatable core. The windings are connected to a source of DC power and when energized they cause the core to rotate in one direction or the other depending on the polarity of the DC current.

Abstract: A liquid level control device including reciprocating magnet shuttle valve means that is moved to control a liquid flow due to the movement of a float lever magnet, magnet means in response to a change in a selected liquid level.

Abstract: Calibrated fluid flow control device comprising several valves (1a to 1b) mounted in parallel on a single body (2) receiving in several housings (6), several seats and several interchangeable calibrated nozzles, the housings (6) being connected to a common input (8) and a common output (7). The valves are preferably bistable electrovalves.

Abstract: A solenoid-operated pressure-fluid valve for reversible control of both supply and exhaust functions of a double-acting fluid-pressure device. A valve body has an inlet port communicating with an inlet chamber and an exhaust-outlet port communicating with an outlet chamber. The valve body has first and second control-port connections for connection to the respective control ports of the double-acting device, and each of these connections communicates with a valve seat in each of the chambers. A rocker arm is pivoted between the two chambers and carries two valve members in each of the two chambers.

Abstract: A fluid control device includes a reciprocating valve comprising a ferromagnetic armature capable of receiving an axis of magnetic polarity corresponding to its axis of reciprocation, the axis generally also corresponding to the longitudinal center of a chamber within said housing, said chamber having a greater radius than the radius of the valve which moves within the chamber. The valve also exhibits a flow-responsive rear radial end face located within a region of communication between said inlet and outlet passages. The valve further has a front end face capable of closing the fluid outlet passage of the device. Further provided is a bias and calibration means located in the housing and disposed co-linearly and distal-proximately to the valve, near the rear radial end face thereof, opposite to the flow-responsive rear radial end of the valve.

Abstract: A solenoid valve having an exciter coil is formed with a central passage for guiding an armature of a permanently magnetic material which is polarized in the direction of its axial movement. At the other end of the passage there is provided a tubular core of a magnetically soft material which acts as a mechanical limit stop for the armature and is also shaped as a valve seat controlled by the end face of the armature. An outer magnetically conductive member is arranged at the other end of the coil around the armature and is spaced from the latter by an air gap so as to act as a magnetic holding member for the armature when the coil is energized and the armature is displaced to its working position away from the stop member. Thus at least the end of the armature which faces the valve seat is provided with a frustoconical attachment having on its periphery a plurality of guiding fingers. The tip of the attachment controls the valve seat while the fingers permit the flow of a fluid past the armature.

Abstract: An instantaneous gas domestic hot water system incorporating a solar heating panel (80) connected to a hot water storage cylinder (81), the outlet from the hot water storage cylinder passing through a heating tube assembly (15) adapted to be heated by a gas burner (13). The outlet from the heating tube assembly is connected to a flow switch (4) and a temperature sensing device (14), the flow switch being connected through an electrical control system (10) to operate a control gas valve (11) and a main gas control (5) to control the flow of gas to a pilot burner (6) which is ignited on sensing of the flow of hot water (3) with the temperature sensing unit (14) controlling the control valve (11) to regulate the flow of gas to the main burner (13) to maintain the water at the water at the water at the outlet (83) at a desired temperature.

Abstract: An automatic drain valve system for collecting and draining a liquid and/or contaminants within a reservoir (148) including a level sensing float (68'). The liquid or contaminants are introduced into the reservoir through an inlet (48) and exit the reservoir (148) through an outlet (176). A control valve which is responsive to the liquid level contained within the reservoir (148) includes coupled magnetic members which selectively open and close the control valve in response to the liquid within the reservoir (148) reaching preselected levels. This control valve activates the drain valve (34') for opening and closing the drain outlet such that the system is automatically drained upon when the liquid within the reservoir reaches a preselected level.

Abstract: An electromagnetic control valve used in an internal combustion engine and which includes a motor having a solenoid coil and a center core, a valve body having an inlet port and outlet ports, a pair of yokes connecting the motor and the valve body, a valve rotor having a shaft, a bushing and a plurality of bores, a rotatable permanent magnet arranged at one end of the valve rotor, a torsion spring arranged at the other end of the valve rotor, and a bearing member for rotatably holding the valve rotor and having openings formed therein.

Abstract: A solenoid valve for opening and closing a fluid passage is disclosed. It includes a valve member supported rotatably within a case and having alternately different magnetic poles formed on the outer periphery of one end thereof and also having a fluid passage formed in the other end thereof; an electromagnetic drive means for creating alternately different and invertible magnetic poles in an opposed relation to the magnetic poles of the valve member to rotate the valve member by a predetermined angle; and plural fluid passages formed within the case and adapted to be brought into communication with each other through the fluid passage of the valve member upon rotation of the valve member at said predetermined angle.

Abstract: A solenoid valve for liquid and gaseous media whose valve closure piece or pieces (24) can be actuated by an armature (20') which is movable relative to the valve seat or seats (18, 19) is disclosed. The armature lies in the magnetic field of at least one electromagnet (4, 5) and of at least one permanent magnet (10) arranged outside the field of the electromagnet. The valve is closed via the armature (20') and has operating air gaps which change in opposite directions upon a movement of the armature. The electromagnet is provided with a core (4) whose ends form three magnet poles (10, 11, 12). The armature (20') which contains the permanent magnet (21) has two pole pieces (20') which extend between the three magnet poles (10, 11, 12) of the electromagnet to form four operating air gaps, the pole pieces being combined with the permanent magnet and connected with them to form as assembly.

Abstract: A no-flow vacuum control signal valve (10, 60) employing a single solenoid coil (34, 116) having a stationary ferromagnetic core (40, 68) and moveable permanent magnet armatures (46, 48, 100, 108) disposed adjacent the opposite ends of said core. The permanent magnet armatures function as individual valve poppets for individually opening and closing a vacuum vent port (18, 96) and a vacuum source port (28, 88) communicating with a valving chamber (14, 78, 80). A spring (50, 52, 104, 112) biases each poppet closed such that no fluid flows when the coil is not energized. Upon pulsing with current of one polarity of the coil, the vent port remains closed and the vacuum source port is opened. Upon pulsing of the coil with current of reverse polarity, the vent port is opened and the vacuum source port remains closed. The valving chamber has a third fluid signal port (32, 98) adopted for connection thereto for control signal output.

Abstract: A hermetically sealed valve has a magnetically actuated rolling diaphragm valve mechanism, and providing an in-line variable opening valve that is completely sealed and requires no shaft, bushings or moving components through the valve body. This provides a valve with a generally in-line flow, which may be completely isolated from contaminants or from the outside environment. The magnetic actuating mechanism permits precise gradual positional control of the valve and at the same time provides considerably greater actuation force against differential pressure across the valve than has previously been possible. The valve actuation mechanism is readily adaptable to digital control techniques.

Abstract: An expansion valve wherein a plunger slidably fitted in a hollow member for sliding movement and opening and closing valve ports formed in the hollow member is driven by an electromagnetic force, and two chambers defined between opposite ends of the plunger and the hollow member are maintained in communication with each other through a pressure equalization passageway formed in the plunger. The expansion valve is capable of allowing a refrigerant to flow therethrough without any resistance offered to its flow and having ability to allow reversible flow of the refrigerant to take place with high responsiveness.

Abstract: A pressure translator for converting a process pressure into a pneumatic signal which can be transmitted and measured by a pressure measurement device at a remote location. The pressure translator provides isolation for the process and the measuring equipment but still translates the process pressure with very high accuracy. The pressure translator employs a balanced valve in cooperation with a forced balanced diaphragm.

Abstract: Device for elimination of vibrations of a valve for decompression of an enclosure containing a fluid under pressure, comprising a lever articulated on the valve body in two parts. The first part is integrally fixed to a spindle mounted to rotate in the valve body. This part comprises a rocker arm and its end opposite the rocker arm is connected to the valve stem. The second part is connected to the moveable armature of an electromagnet and comprises a bearing surface for the tappet. The two parts of the lever are connected through the intermediary of a friction coupling. Movements of the valve beyond the position of locking by the electromagnet are damped by the friction coupling. The invention is applicable in particular to a decompression valve in a pressurized water nuclear reactor.

Abstract: An electromagnetic double-valve can synchronously regulate or control the ow of two materials without the need of a costly mechanical linkage between the two individual valves which may be arranged in a common housing. An armature serves as the valve body or plug in each valve and is held in one valve position by permanent magnets and is switched to the other valve position by a synchronously controlled electromagnetic coil or coils which are connected in series. When one armature is lifted quicker than the other by the electromagnet or magnets, then the total magnetic flux decreases, whereby the second armature is also lifted. The synchronization of the switching operation is enforced by the common, spacially closed magnetic flux through both armatures and by the common effect on both armatures by the electromagnetic coil or coils.

Abstract: A non-invasively adjustable intercranial pressure regulator valve and adjustment mechanism therefor which is adapted particularly for the treatment of hydrocephalus and the draining of cerebrospinal fluid (CSF) from a ventricle in the brain to another location in the patient's body. The valve includes a flexible diaphragm which is contacted on both sides by the CSF fluid. A valve seat on the diaphragm is movable with the diaphragm and a ball closure valve is positioned on the cephalad side of the diaphragm. The pressure differential of the CSF fluid across the diaphragm causes the valve seat to flex into and out of engagement with the ball closure valve.

Abstract: Electropneumatic pilot or anticipatory control stage for a pneumatic servo valve includes a nozzle impact plate system, with an impact plate (9,23) controlled by a plunger coil (7) by the input of electric signals. Openings (58,61,62) are arranged in a diaphragm spring disk (10) serving as carrier element for the plunger coil (7), as well as in the front flange (65) of the coil body (8), these openings (58,61,62) guide a flow of air (64) passing through a measuring nozzle (22) of the valve main stage (2) into the pilot control state (1) through a magnetic gap or space (66,67) about the plunger coil (7) and conduct the air into the atmosphere via exhaust ducts (63). By means of the work medium inherent to the servo valve, a permanent cooling of the plunger coil (7) is effected. The automatic control valve affords miniaturization and the improvement of the valve dynamics for better integration in pneumatic drives.

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: A solenoid type flow control valve having a valve body formed with an outlet and inlet ports, a cylindrical core disposed in the valve body between the inlet and outlet ports and formed with a suitable number of valve ports for connecting the inlet port with the outlet port, a valve member slidable along the outer surface of the core to cover the valve ports, a linear motor assembly for moving the valve member to uncover the valve ports, and fluid flow passages formed around the linear motor assembly so that the fluid from the inlet port is introduced through the passages into the valve ports.

Abstract: A magnetically operated valve having a permanent magnet with constant remanence wherein the permanent magnet is formed with an annular configuration and is located in one end of a tubular core guide member which operates to guide a movable core member forming the valve body. The permanent magnet is produced from a rare earth/cobalt alloy and secures the valve in at least one of a plurality of switched positions and a ferromagnetic circuit is formed with sheet metal sheets extending to form the outer portion of the ferromagnetic circuit with the movable core member forming the inner part thereof. The permanent magnet is inserted in cutout portions of the sheet metal sheets which form the outer part of the ferromagnetic circuit.

Abstract: A fluid operating device including a cylinder assembly with a cylinder bore and a pair of pistons slidably disposed therein. A plurality of electromagnets are mounted on each piston in opposed relation and extend the pistons by magnetic repulsion when energized. Inlet and outlet valves are provided in the cylinder and include permanent magnet valve members which open and close the valves upon energization and de-energization of the electromagnets.

Abstract: A fire flap arrangement for installation in a flow channel comprises a housing with opposite front walls and openings in the front walls. A pair of fire flaps are pivoted in said housing and held by means of permanent magnets in rest positions outside of the flow area. A locking bar within the housing can be displaced radially inwards pivoting the fire flaps into their locking positions in which they close the front wall openings. The locking bar in its locking position bridges the pair of fire flaps and presses them outwards against the front walls. The arrangement is actuated by a liquid pressure driven piston, the liquid also serving as a cooling medium for the housing.

Abstract: A linear motor-actuated flow control valve includes: a casing having an inlet port and an outlet port; a moving-coil linear motor disposed within said casing, said linear motor including a hollow, ferromagnetic core which delimits the interior of said casing into valve chambers and which has a valve hole or holes for communicating said inlet and outlet ports with each other, a bobbin slidably disposed on said core for controlling the opening degree of the valve hole(s), an electromagnetic coil wound on said bobbin, a permanent magnet so arranged that the magnetic flux produced thereby extends axially of said electromagnetic coil, and a magnetic body for forming a magnetic circuit, in cooperation with said core, for the flux produced by said permanent magnet; and spring for biasing said bobbin so that said bobbin is retained at a predetermined position by said spring means when said electromagnetic coil is in the de-energized state, whereby said valve hole(s) is/are held open or closed to a predetermined degre

Abstract: The solenoid valve has an exciter coil formed with a central passage which at one end guides a plunger or armature of a permanently magnetic material which is polarized in the direction of its axial movement. At the other end of the passage there is provided a tubular core of a magnetically soft material which acts as a mechanical limit stop for the armature and is also shaped as a valve seat controlled by the end face of the armature. An annular magnetically conductive member is arranged at the other end of the coil around the armature and is spaced from the latter by an aggregate so as to act as a magnetic holding member for the armature when the coil is energized and the armature is displaced to its working position away from the stop member.

Abstract: An infusion pump system is described containing a valved cassette which is used as a pumping chamber for conducting fluid from an upstream portion to a downstream portion of the system. The removable cassette contains magnetically biased valves at both ends. Externally mounted magnets bias the valves within the cassette to provide an opening of the inlet valve and closing of the output valve during the fill cycle and closing of the inlet valve and opening of the outlet valve during the pump cycle. Free flow of infusion fluid is allowed when the valved cassette is removed from the pump mounting member which houses the actuating magnets and the reciprocating actuator for the pumping chamber.

Abstract: The present invention provides a new and improved solenoid actuated valve device for controlling the flow of fluid comprising a body having an inlet and an outlet port extending therethrough, a hollow tubular core axially mounted within said body with one end thereof disposed in communication with said outlet port and having at least one radially extending aperture therethrough to provide communication between said inlet port and said outlet port, a bobbin slidably mounted on said core to control the effective open area of said aperture, a solenoid coil wound on said bobbin, an annular yoke resiliently mounted within said body, permanent magnets secured in said yoke so that the magnetic flux thereof intersects the windings of said solenoid coil at right angles thereto, a cover secured to said body in engagement with the other end of said core, said body, said cover member, said yoke and said core being of magnetic material to define a magnetic circuit with said permanent magnets to provide a magnetic force ca

Abstract: A magnetic valve in which two cylindrical soft-iron cores are provided which are disposed parallel to one another. The soft-iron cores are each surrounded by a coil. An armature of magnetically conductive material which carries a valve body is caused to move inside the soft-iron cores. Between the two coils, an axially magnetized permanent magnet is disposed in circular-annular fashion. The soft-iron cores have a magnetic short-circuit connecting them with one another.

Abstract: An air bubble hydromassaging apparatus having a blower housed in a control unit, a bubble grid adapted to be placed in a bathtub, and air tubing enclosing a check valve to connect the control unit to the bubble grid. The control unit is provided with a bushing type compressed air outlet and the bubble grid is provided with a bushing type compressed air inlet. The air hose has a connector fitting on each end by which it is detachably and airtightly connected to the compressed air outlet of the control unit at one end and to the compressed air inlet of the bubble grid at the other end. A check valve built into the connector fitting serves to obstruct passage through the connector fitting when the blower is inoperative and opens to permit passage through the connector fitting when the blower is operative.

Abstract: A magnetic snap-action directional control valve mechanism preferably for use with a fluid pressure actuated reciprocating motor or pump (28). A driven member, represented by a tie rod assembly (42) in the described preferred embodiment, is caused to reciprocate at the same frequency as the reciprocating motor (28) due to contact of the driven member by a sealing member within the motor as represented by a piston (36) in the described preferred embodiment. The driven member includes a magnetic area which magnetically interacts with another magnetic area on the valve core of the magnetic directional control valve, thus causing the valve core (19) to also reciprocate at the motor frequency. Due to the nature of the magnetic interaction between the magnetic areas, the valve core (19) reciprocates in a snap-action fashion.

Abstract: A solenoid-operated valve for selecting one of two pressure sources has a stationary core which comprises a cylindrical magnetic body which is energized by an excitation current of selected direction and which is housed in a cylindrical valve housing. First and second magnet chambers communicating with first and second pressure sources at two ends of the stationary core are defined in the portions of the housing which oppose first and second pole faces. First and second permanent magnets which are magnetized to the poles opposite to those of the first and second pole faces are respectively housed in the first and second magnet chambers. A first valve member is formed integrally with the first permanent magnet and closes a vent hole communicating with the first pressure source when the first permanent magnet is repelled from the first pole face.

Abstract: A mixing valve for mixing a first liquid with a second liquid. A control handle allows an operator to control both the ratio of the two liquids in the mixture and the flow rate of the mixture. A spherical guide body is rotatably disposed within an inside spherical cavity of a valve body. Separate inlet orifices inject a first liquid and a second liquid into the spherical cavity, while a third orifice discharges the mixture from the spherical cavity. A spherical guide body is rotatably disposed within the spherical cavity. A mixing cavity is disposed in the guide body to communicate with the discharge orifice and the two inlet orifices. A handle is connected to the guide body to allow an operator to rotate the guide body. If the guide body is rotated in one direction, the ratio of the area of the first inlet orifice communicating with the mixing cavity to the area of the second inlet orifice communicating with the mixing cavity is varied, changing the composition of the mixture.

Abstract: A solenoid actuated valve device for electrically controlling the flow of fluid includes a body having an inlet port and an outlet port, a hollow core positioned within the body and having first and second axially spaced openings which provide fluid communication between said inlet and outlet ports and a cover member secured to one end of the body so that the core is supported by the body and the cover member for axial adjustment movement relative thereto. A bobbin is slidably mounted on the core and is provided with a valve portion for controlling the effective area of the first and second openings. A solenoid coil is provided for shifting the value in opposite directions. In the absence of electric current to the coil first and second springs maintain the bobbin in a position so that the valve portion thereof is located between the first and second openings in the coil so that one opening will be completely open and the other will be completely closed.

Abstract: A solenoid actuated valve device for controlling the flow of fluid comprising a body having an inlet port, a first outlet port, a second outlet port, and a bore for fluid communication with the inlet and first outlet ports at one end thereof and for fluid communication with the second outlet port at the other end thereof. A magnetic hollow tubular core is axially mounted within the bore for dividing the bore into an annular outer chamber, a first inner chamber and a second inner chamber communicating among the inlet port, first outlet port and second outlet port, respectively, and the core has first and second apertures for fluid communication between the outer chamber and first and second inner chambers, respectively.

Abstract: A rotary solenoid actuator for proportionally controlling the flow of fluid, such as air, in a pipe comprises a housing with a rotor rotatably mounted thereon. A stationary coreless coil for generating a magnetic field in response to a control current therethrough is mounted in the housing. A permanent magnet is affixed to a rotatably mounted shaft within the coil, and a return spring is attached to the rotating shaft. Due to low hysteresis in the coreless coil, there is a linear relationship between the control current and the fluid flow.

Abstract: An automatic fuel supply stopping device incorporated in fuel combustion equipment including a shut-off valve and a combustor. The automatic fuel supply stopping device comprises a fluid intercepting mechanism interposed in a channel through which the fuel supply to the combustor is supplied. A photosensor is adapted to detect fuel combustion in the combustor by radiation emitted from a thermosensitive luminous medium. The fluid intercepting mechanism alternately takes its first stable state or passage blocking state and is changed over, in response to an output from a sensor circuit, from the passage opening state to the passage blocking state.

Abstract: Pressure relief valve for containers, including a ferro-magnetic valve body having a hole formed therein and a sealing element for the hole, the sealing element being in the form of a disc-shaped permanent magnet having a side facing the hole formed in the valve body and an elastomer seal disposed on the side of the permanent magnet facing the hole, and a cap formed of synthetic material covering the valve.

Abstract: A micro dispense valve arrangement for accurately dispensing minute quantities of a fluid. The valve arrangement interfaces an enclosed interior region under pressure with an exterior region of less pressure through an orifice opening. The orifice wall is tapered from interior to exterior to bound a frustoconical region constricting toward the exterior to accommodate a magnetizable pellet or ball. The ball is held in its seated position against the orifice wall by permanent magnets imbedded in the wall. An AC coil surrounding the orifice opening acts when energized to cause the ball to move between its seated or closed position and a non-magnetizable screen in its open position. The frequency and duration of applied positive and negative pulses driving the coil act to control the on/off fluid flow duty cycle of the valve.

Abstract: A magnetic control device having a movable, permanent magnet or fixed-polar portion, a movable element of magnetizable material, i.e., material of high permeability and a plurality of fixed members also of magnetizable material.

Abstract: A pulse actuated solenoid valve having a valve body and cover with a valve plunger formed as a permanent magnet is biased in a closed position to prevent flow through. Said solenoid valve has an electromagnetic coil and core placed adjacent the valve plunger to place the plunger in an open position, permitting flow through said solenoid valve and for releasing it to its closed position. The electromagnetic coil has one end connected to the pole of a single-pole, double-throw switch, while the other end of the electromagnetic coil is connected to one side of a capacitor. One terminal of the double-throw switch is connected to the other side of the capacitor, while the other terminal is connected to one terminal of a power source; the other side of the capacitor is also connected to the other terminal of the power source. Means are provided to time the movement of the double-throw switch from one position to the other. Both A.C. and D.C.

Abstract: An automatic air regulating device for use in a forced air heating or cooling system whereby air vents or ducts leading to various rooms within a building may be automatically opened or closed to conserve energy. The automatic air regulating device of the present invention utilizes airfoil shaped dampers rotatable between open and closed positions within the building's air ducts. This airfoil shape thus provides for efficient and inexpensive operation of the dampers by utilizing the forced air flowing through the system for its operating forces. The dampers are further controlled by operation of restraining means which establish opening and closing conditions of the dampers in response to programmed or timed parameters set according to desired occupancy or use patterns within the building.

Abstract: A magnetically actuated valve which includes a one-piece valve body, a linearly translatable poppet for selectively blocking an aperture in the valve body, a magnetically operable rotor, a magnetic collar or electromagnetic coil external to the valve body for inducing rotation of the rotor, and a screw and nut arrangement for converting rotational motion of the rotor into linear motion of the poppet.

Abstract: A remotely controlled oil drain valve assembly is provided. The assembly comprises a valve body which is threadably connected to the crankcase of an internal combustion engine. A valve core is slideably mounted within the valve body. Ports in the valve body and valve core, when in alignment, permit the flow of oil from the crankcase through a passageway in the valve core. The ports are brought in alignment by means mounted in the valve body which receive an electric signal from a remote source to cause rotation of the valve core to the proper position.

Abstract: A rotary solenoid motor adapted for use in a flow control valve apparatus. The solenoid motor having a shaft on which a valve member is connected. A torsion bar is connected between the shaft and a housing for generating a torsional force opposite to an electro-magnetic force. The shaft and the housing has a pair of portions for fixing the torsion bar. Each of the portions forms a regular polygonal cross-sectional shape.

Abstract: A control valve assembly of the type in which a slide valve is driven along a hollow iron core by a linear motor to control the degree of communication between an inlet port and outlet port through the hollow interior of the iron core. A valve hole is provided in the slide valve so as to overlap a communicating hole formed in the iron core. When the linear motor is in the de-energized state the slide valve is retained by springs at a position that permits the valve hole to overlap the communicating hole to a predetermined extent. The linear motor upon being energized drives the slide valve against the springs so that the valve hole increases the opening degree of the communicating hole with an increase in the energizing current. Instead of providing the valve hole in the slide valve, a larger, second communicating hole may be formed in the iron core, this second hole being fully closed and the other communicating hole fully opened by the slide valve when the linear motor is de-energized.

Abstract: The pump has a chamber in which a piston reciprocates to pump a liquid. The piston is moved by having secured thereto the armature of at least one electromagnet (preferably two). The coil of the electromagnet is suitably external of the pump casing. A control circuit pulses the electromagnet at a predetermined rate to provide a predetermined periodic output.In a preferred form, the pump is mounted together with a liquid reservoir on a printed circuit board, and the unit is encapsulated for implantation in the human body to infuse a liquid medicine at a controlled rate into the bloodstream.

Abstract: A liquid level control utilizing magnetic repulsion for raising and lowering a lever for venting or closing a gas pressure supply path to move a valve assembly, in the gas pressure supply path, in a relay-type snap action for opening or closing a valve controlling the liquid input and output of a vessel in response to the rise and fall of a float assembly with the liquid level.

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.