Abstract: A controllable solenoid valve having a sealed chamber that isolates the armature cavity from the function fluid or external water sources with oil or dielectric fluid and is ported to a reservoir or to a surrounding housing to maintain fluid communication with the armature cavity. The valve may also have a closed internal chamber filled with oil or dielectric fluid to maintain isolation of the armature cavity from the function fluid or other water sources. The closed chamber may also encompass the electrodes or the coil of the solenoid. In a preferred embodiment, the chamber is in fluid communication with transducers that sense fluid pressure.

Abstract: A solenoid valve assembly includes a three-port solenoid valve and a solenoid-valve holder having the solenoid valve mounted thereon, so that the solenoid valve can be attached on a pneumatic instrument via the solenoid-valve holder. When the solenoid valve is mounted on the solenoid-valve holder, this solenoid-valve holder is provided with a plurality of flow paths that communicate with each port of the solenoid valve, connection terminals electrically and respectively connected to electrification terminals conducting with an exciting coil of the solenoid valve, and receiving terminals for connecting the connection terminals to terminals of external power, respectively.

Abstract: Two connected valve units each formed by serially connecting plural electromagnetic valves in a direct abutment state are disposed in parallel between two end blocks. The two end blocks are tightened with plural connecting bolts disposed therebetween so as to directly clamp and fix the two connected valve units from both sides in the serial connection direction of the electromagnetic valves. One of the end blocks is provided with a power supply connector, and the other is provided with an air inlet port and a discharge port.

Abstract: A hydraulic control valve with a monolithic body having four sides located between a top and a bottom, and all pilot ports on a body front side, valve work ports on the top side, three bores running within the body from the front side to a rear side, a spool in each bore, and a single three section spool port lock that locks two or three ports at the same time, the pilot ports present machined female quick-connect connections, with spring wet cavities being provided for mechanically operated control spools.

Abstract: A solenoid valve has a linear solenoid, a common cylindrical sleeve, one axial end of which is fixed to the linear solenoid, and a common spool movably accommodated in the sleeve, and a return spring. The solenoid valve further has a first three-way valve formed by a first portion of the sleeve and a first portion of the spool for operating as a normally-closed type valve, and a second three-way valve formed by a second portion of the sleeve and a second portion of the spool for operating as a normally-opened type valve.

Abstract: A solenoid valve device includes a solenoid valve that has a solenoid portion, a valve element that drivingly slides using electromagnetic force generated by the solenoid portion and regulates and outputs fluid pressure supplied from a fluid pressure source, a spring that biases the valve element in the sliding direction, and a spring chamber that accommodates the spring; an accumulating portion that accumulates operation fluid; an intake check valve that permits the flow of operation fluid from the accumulating portion to the spring chamber; and a discharge check valve that permits the flow of operation fluid from the spring chamber to an operation destination different from the accumulating portion.

Abstract: The invention relates to a valve device comprising a valve housing (2) and a valve piston (4) arranged in an axially displaceable manner in a piston bore (3) of the valve housing (2), via which valve piston a first load connection (A) and a second load connection (B) can alternately be connected to a pressure connection (P) and to a tank connection (T1, T2) by the action of a first solenoid magnet (5) and a second solenoid magnet (6), a pilot control unit (7) being provided, which comprises a first pilot control chamber (8) that pressurizes a first piston back side (9) of the valve piston (4) and a second pilot control chamber (10) that pressurizes a second piston back side (11) of the valve piston (4), the first and second pilot control chambers (8, 10) being connectable via a respective fluid-conducting connection (12, 13) to the pressure connection (P), a first pilot control piston (14) and a second pilot control piston (15) being provided, which release or close a fluid-conducting connection (16, 17) betw

Abstract: A downhole flow control tool 1, includes a flow control member in the form of a sleeve 8, and comprises a main body 2 having a longitudinal internal bore 3 extending therethrough, an upper end 4 having a box section 6, and a lower end 5 with a pin section 7, which enable connection of the tool 1 into a work string. The flow control sleeve 8 is mounted for movement relative to the bore 3 between at least a closed and one of several open positions. The tool body 2 includes several flow ports extending through a wall of the body 2 and spaced around a circumference of the body 2. The tool provides multiple fluid flow control options for directing and splitting fluid flow for example during a drilling operation to clear settled cuttings by suitable location of the tool.

Abstract: A first piston with a smaller diameter and a second piston with a larger diameter that switch a spool between a first switching position at one end and a second switching position at the other end, and a return spring that moves the spool to a neutral switching position are provided. At the neutral switching position, some of a plurality of ports communicate with one another and the remaining ports are closed; at the first switching position, the communication-and-closure relationship of the plurality of ports is the reverse of that in the neutral switching position; and at the second switching position, all the plurality of ports are closed. When the spool is switched to the neutral switching position and the first switching position, only the first piston is operated, and when the spool is switched to the second switching position, the second piston is operated.

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

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

Abstract: A method for actuating a hydraulic servo system with a proportional valve that converts an electrical control signal into a hydraulic pilot pressure with which the hydraulic servo system is actuated. An additional impulse is fed to the proportional valve at the beginning of a desired change of the electrical control signal.

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

Abstract: A main control valve is actuated by a pilot fluid control signal between open and closed positions to supply fluid to an actuator such as a valve actuator. A stack of logic control valves is supported on the main valve- and controls the flow of the pilot signal. Each of the logic control valves has a housing of common design. Intermediate flow-directing plates of different designs provide fluid communication between adjacent housings. The stack has a common pilot feed passage and a common exhaust passage that are each defined by an annular clearance around supporting tie bars that pass through bores in the stack. Each plate has apertures that form part of the exhaust and pilot feed passages and an aperture that interconnects the returning pilot signal with the pilot inlet of the next valve in the stack. The arrangement allows for simplification of the design of the apparatus with a single housing design and multiple plate designs.

Abstract: A directional or flow control valve has an inlet connection, an outlet connection, and a slide that controls a fluid connection between the inlet connection and the outlet connection and is configured to control the fluid connection in at least two adjustable opening cross-sections that are spaced axially apart from each other and allow a partial flow to pass through.

Abstract: A fast-acting, pneumatic diaphragm valve includes a diaphragm valve closure member, a pneumatic piston that provides a closure force on the closure member, and a solenoid pilot valve that controls pressurized air to the piston to cause the piston to move in a reciprocal manner so that the closure member opens and closes the valve. The valve seat seal can be elastomer for enhancing speed, and the solenoid pilot valve can be positioned and configured with air flow longitudinally through or past the solenoid armature to enhance speed.

Abstract: A valve for controlling pressure in a system is provided. The valve includes a housing, a servo spool and a piston positioned within the housing with the piston and the servo spool being movable relative to each other. The piston defines a first orifice configured to communicate with a supply of pressurized fluid and a second orifice configured to communicate with a portion of the system exterior to the valve. A first chamber is arranged such that force due to fluid pressure in the first chamber is configured to move the piston in a first direction. The first chamber includes a third orifice configured to communicate with a controlled pressure in the system. A second chamber is at least partially defined by the housing and the piston and includes a fourth orifice configured to communicate with a low pressure fluid source. A biasing element is arranged in the second chamber.

Abstract: A method is disclosed that includes allowing both frequency and amplitude of a periodic waveform to be adjusted. The method also includes creating the periodic waveform having the frequency and the amplitude. The periodic waveform is coupled to at least one control signal. The at least one control signal is provided to an output suitable for coupling to an actuator of an electronically controlled device. An apparatus and computer program product are disclosed.

Abstract: The actuator (50) comprises a slide (52) carrying at least two stages (54, 56) and being capable of sliding in a cylinder and two control chambers (62, 64) connected to respective use holes (U1, U2) of an electrically controlled servo-valve hydraulic distributor (20). The control chambers (62, 64) are each situated on one side of a respective stage and an intermediate chamber connected to high or low pressure is situated between the other sides of the stages. In the event of electrical control failure, the distributor (20) slide is taken to a safety position in which the control chambers (62, 64) of the actuator (50) are at the same low or high pressure opposed to that applying in the intermediate chamber (66) so that each stage of the actuator slide is then subjected to high pressure on one side and to low pressure on the other side.

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

Abstract: A plurality of valve assemblies are provided to a base, and an air-supply flow path for supplying compressed air to each valve assembly is formed in the base. A main flow path communicating with the air-supply flow path and communicating with a pilot air-supply flow path is formed in an air supply block. When the compressed air is supplied to the air-supply flow path and the pilot air-supply flow path from the main flow path, a manifold solenoid valve becomes an internal pilot type. An external pilot flow path communicating with the pilot air-supply flow path is formed in an external pilot block, and when the external pilot block is provided, communication between the main flow path and the pilot air-supply flow path is shut off, and the manifold solenoid valve becomes an external pilot type in which the pilot pressure is supplied from the external pilot flow path.

Abstract: Disclosed is an exemplary valve having a first valve member that may include at least one orifice, and which is moveable between a first position and a second position, and a second valve member that includes at least one orifice, and which is moveable relative to the first valve member between a first position, in which the at least one orifice of the second valve member is fluidly disconnected from the at least one orifice of the first valve member, and a second position, in which the at least one orifice of the second valve member is fluidly connected to the at least one orifice of the first valve member. The exemplary valve may also include first and second actuators for moving the first and second valve members between their respective first and second positions.

Abstract: A plurality of solenoid valves are installed on a valve mount surface of a manifold base to receive a pressure fluid supplied from a supply passage of the manifold base via a supply communication hole. A stop valve base connected to a side surface of the manifold base has a stop valve mount surface formed on the upper surface to the side of the valve mount surface. The stop valve is attached to the stop valve mount surface to open and close the supply communication hole by pushing and pulling the stop valve from a side with the solenoid valve.

Abstract: An apparatus includes dead band reduction circuitry. The dead band reduction circuitry includes an input configured to receive an input signal and an output configured to provide an output signal. The dead band circuitry is configured to apply compensation to the input signal to create the output signal. The output is configured to be coupled to an electronically controlled valve. The valve is configured to use the output signal to control movement of a valve member in the valve. The valve member includes one or more lands that overlaps an associated one or more openings. The one or more lands are sized relative to an associated one or more openings such that a dead band is caused. The compensation is defined to reduce the dead band.

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

Abstract: A stepper motor driven actuator that eliminates the need for a position sensor is provided. The stepper motor rotates a cam in a control piston valve. In a single nozzle embodiment, pressure balance is maintained by a spring preload on one end of the piston in one embodiment, and by hydraulic pressure acting on a double diameter end portion of the piston in another embodiment. As the cam is rotated, the change in the gap between the nozzle and the cam changes the pressures on the control piston ends, which forces the piston in the direction that will re-equalize the pressure based on the cam-nozzle gap. As a result, the head or rod of the actuator piston receives high pressure flow, thereby moving the actuator. Movement of the actuator rod provides mechanical feedback to the cam, causing the cam to move back to its mechanical null position.

Abstract: Two stage spool valves having, in a single assembly, a first stage spool and a second stage spool. The first stage spool may have a solenoid actuator with a return spring, with the second stage spool having either a hydraulic return or a spring return, or both. The solenoid actuator may be comprised of a stationary structure defining a magnetic flux path, including a stationary structure pole face, that together with a moveable structure, including a moveable structure pole face, define a substantially zero air gap magnetic circuit when the solenoid actuator is actuated, the pole faces of the stationary structure and the moveable structure each being defined in part by soft magnetic iron and in part by hardened steel, the hardened steel of the moveable structure contacting the hardened steel of the stationary structure and the soft magnetic iron of the moveable structure being face to face with the soft magnetic iron of the stationary structure when the solenoid actuator is actuated.

Abstract: A hydraulic control valve is provided, which can prevent the occurrence of overload by relieving hydraulic fluid of a return line in which the overload occurs due to an inertial force of a rotator when a hydraulic motor that is operated by the hydraulic fluid supplied from a hydraulic pump stops halfway.

Abstract: A low energy stepper motor driven fuel metering valve (FMV) that eliminates the need for a position sensor is provided. The stepper motor rotates a cam that replaces the flapper valve used in conventional systems. The cam rotation increases the gap between the cam and nozzle on one side of the cam. The gap difference affects the pressures on the spool piston ends, which forces the piston in the direction that will return the cam-nozzle gap to a distance that results in a pressure balance to return. As a result, the relatively low energy stepper motor controls the relatively high energy hydromechanical system via the cam-nozzle-orifice system. The cam is precision machined and assures stroke/degree gain accuracy. The hydraulic system assures the piston tracks the cam essentially perfectly except for the effects of piston stiction forces.

Abstract: A pressure control valve is provided, which can variably control the set pressure of the pressure control valve through manipulation of a signal pressure generation device in an operator's seat or the like.

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

Abstract: A system for positioning a device such as a valve with a mechanical input using a fluid operated actuator, a mechanical position feedback member coupled to a feedback element of the fluid operated actuator and an activation fluid valve. The fluid operated actuator has an output coupled to the mechanical input of the valve, a feedback element for mechanically indicating a position of the valve, and inputs for actuating fluid, such that fluid at the inputs causes the fluid operated actuator to move in opposing directions. The activation fluid valve has outputs coupled to the inputs of the fluid operated actuator, a first opposing force input coupled to the mechanical position feedback member and a second opposing force input coupled to a control input force. The position of the activation fluid valve is controlled by a balance between the force from the mechanical feedback member and the control input force.

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

Abstract: A method of steering a vehicle with a hydraulic steering system is disclosed. A first control signal is sent to a pilot valve. The pilot valve is operated to direct pilot fluid to a main valve in response to the first control signal. The main valve is opened to a first position in response to the pilot fluid. Fluid is directed through the main valve to a first actuator. Resistance to actuation of the first actuator is detected. The detected resistance is compared to a threshold resistance. A second control signal is sent to the pilot valve when the detected resistance exceeds the threshold resistance. The pilot valve is operated to direct pilot fluid to the main valve in response to the second control signal. The main valve is opened to a second position in response to the pilot fluid. Fluid is directed through the main valve to the first actuator and a second actuator.

Abstract: A proportional pressure control valve includes a valve housing (38) with at least three fluid connections (1, 2, 3). The valve can be connected to a hydraulic drive system with a pre-determinable consumer pressure. The valve can perform reliable valve switching functions even for low-viscous fluid media, and can reduce its susceptibility to disturbance variables. A valve piston (56) actively connected to a pilot seat (5) by an energy accumulator (62) can be controlled by a control device (40). The consumer pressure on a fluid connection (1) acts on the valve piston (56) such that, according to the consumer pressure and the actuating force of the control device (40), a fluid can flow between the two other fluid connections (2 and 3) in both directions inside the valve housing (38).

Abstract: A valve arrangement includes a valve member, which rotates continuously in one sense. The generally cylindrical head of the valve member, within the housing, is formed to co-operate with various ports to create reciprocation in the actuator. It is preferred to provide some vibration of the valve member, to assist in overcoming the effects of friction.

Abstract: An electrohydraulic booster comprises an electromechanical transducer and a hydromechanical power stage which is connected to a pressurized medium supply and encompasses a cylinder and a piston that can be moved therein along the working axis. The electromechanical transducer acts on a spool valve which is associated with the hydromechanical power stage, is disposed at least in part inside the piston, is guided within a guiding bore in such a way as to be movable along the working axis, and has two first leading edges that cooperate with corresponding second leading edges located on the guiding bore in order to form a hydraulic sequential control. The guiding bore consists of two parts, i.e. a cylinder-mounted first section and a second section which can be moved along the working axis and comprises the second leading edges.

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

Abstract: A proportional pressure control valve particularly for electro-hydraulic transmissions. The valve includes a cage having pump, clutch, and tank port openings. A spool is received within the cage for controlling flow between the clutch port and the pump and tank ports of the system. The spool has a feedback pressure surface responsive to an applied feedback fluid pressure urging the spool to move towards a first position allowing flow between the clutch and tank ports. A feedback pressure chamber is defined within the cage for developing the feedback fluid pressure. A clutch port pressure feedback passage couples the clutch port with the feedback pressure chamber for admitting flow from the clutch port into the feedback pressure chamber to develop the feedback fluid pressure. The clutch port pressure feedback passage is formed within the cage wall to couple the control pressure chamber in fluid communication with the system clutch port.

Abstract: Two stage spool valves having, in a single assembly, a first stage spool and a second stage spool. The first stage spool may have a solenoid actuator with a return spring, with the second stage spool having either a hydraulic return or a spring return, or both. The solenoid actuator may be comprised of a stationary structure defining a magnetic flux path, including a stationary structure pole face, that together with a moveable structure, including a moveable structure pole face, define a substantially zero air gap magnetic circuit when the solenoid actuator is actuated, the pole faces of the stationary structure and the moveable structure each being defined in part by soft magnetic iron and in part by hardened steel, the hardened steel of the moveable structure contacting the hardened steel of the stationary structure and the soft magnetic iron of the moveable structure being face to face with the soft magnetic iron of the stationary structure when the solenoid actuator is actuated.

Abstract: Two stage spool valves having, in a single assembly, a first stage spool and a second stage spool. The first stage spool may have a solenoid actuator with a return spring, with the second stage spool having either a hydraulic return or a spring return, or both. The solenoid actuator may be comprised of a stationary structure defining a magnetic flux path, including a stationary structure pole face, that together with a moveable structure, including a moveable structure pole face, define a substantially zero air gap magnetic circuit when the solenoid actuator is actuated, the pole faces of the stationary structure and the moveable structure each being defined in part by soft magnetic iron and in part by hardened steel, the hardened steel of the moveable structure contacting the hardened steel of the stationary structure and the soft magnetic iron of the moveable structure being face to face with the soft magnetic iron of the stationary structure when the solenoid actuator is actuated.

Abstract: A feeder terminal connected to the core wire of the feeder cable is installed in the storage chamber of the terminal storage box, and the feeder cable and the feeder terminal are gripped to be fixed between the terminal storage box and the lid such that the feeder socket is assembled. The feeder socket is inserted into the socket hole formed in the terminal cover to connect the feeder terminal to the power receiving terminal communicated with the electromagnetic operation unit.

Abstract: A hydraulic directional valve having an electromagnetic actuating unit and a valve section, an essentially cylindrical, blind hole-like receptacle being formed on one component of the actuating unit, a flange section of a valve housing of the valve section engaging in the receptacle, the flange section being provided with an angular groove which extends in a circumferential direction, and an essentially hollow cylindrical wall of the receptacle in the region of the annular groove engaging in said annular groove in such a way that it bears on the groove base of the annular groove, along the entire circumference of said annular groove. The torsional rigidity between the flange section and the wall is increased. In this context, particular emphasis is placed on processing reliability and economic viability of the connecting process.

Abstract: A valve for controlling fluid flow in a fluid system is disclosed. The valve includes a housing, a servo spool, and a piston. The servo spool defines a spiral groove and a spiral land. The piston defines an orifice configured to provide flow communication to a supply of pressurized fluid and an orifice configured to provide flow communication to a portion of the fluid system exterior to the valve. The valve further includes a main spool operably coupled to the piston. The main spool is configured to control flow of fluid in the fluid system. The spiral groove and spiral land are configured such that angular displacement of the servo spool results in a force imbalance on the piston, thereby moving the piston and the main spool in one of a first direction and a second direction.

Abstract: The present invention is directed to a solenoid valve having a valve body with a fluid passage extending at least partially through the valve body. A supply port is disposed through the valve body and is operably connected to the fluid passage. The supply port introduces fluid medium from, such as hydraulic fluid, transmission fluid or some other suitable fluid from a pressure source such as a pump. A control port is also disposed through the valve body and is operably connected to the fluid passage. An exhaust port is also disposed through the valve body and is operably connected to the fluid passage. Between the control port and the supply port and the exhaust port there is a valve member that is operably disposed in the fluid passage. This is accomplished by way of a bore extending at least partially through the valve member. A metering orifice connects the fluid passage or exhaust port with the bore of the valve member.

Abstract: A multi-way valve has a housing with a stepped bore forming two piston guiding regions and a shoulder ring with two sealing shoulders. The housing also has a first, second and central transverse bores which are spaced along the cylindrical bore. A contact piston has a piston rod and sealing members secured thereon. The guide members are pressed fit onto opposite ends of the piston rod.

Abstract: A soft start device for compressed air systems comprises a primary inlet at which compressed air at a primary pressure may be supplied, the primary inlet being connected with a secondary outlet able to be coupled with a load, by a valve circuit, at which compressed air is taken at the secondary pressure lower than or equal to the primary pressure, a principal valve placed between the primary and secondary outlet, said principal valve being able to be shunted by a bypass, a choke device being placed in the bypass, the principal valve and the choke device together with further valves of the valve circuit being connected together in a circuit and the valve circuit placed in a standard venting switching setting that the secondary outlet is vented.

Abstract: A cartridge valve assembly includes a body having a pilot port, a first port, a second port, a third port fluidly connected to a central bore, and a spool positioned within the central bore and being movable between at least a first position and a second position. The spool includes a first chamber at a first end surface of the spool in fluid communication with the pilot port, a second chamber at a second end surface of the spool, and a control chamber. The area of the first end surface is greater than the area of the second end surface. A passage fluidly communicates the control chamber with the second chamber. In the first position, the first port and the second port fluidly communicate with the control chamber. In the second position, the second port and the third port fluidly communicate with the control chamber.

Abstract: An apparatus for controlling a valve including an enclosure that defines first and second chambers, an indicator proximate the first and second chambers, an operating media distribution system that is disposed in the first chamber, and an electronic control unit disposed in the second chamber. The operating media distribution system includes a manifold block that has an exterior surface, and a plurality of operating media distribution cartridges exchangeably disposed with respect to the manifold block. The manifold block defines a plurality of holes, an operating media supply passage and an operating media exhaust passage. Each of the plurality of operating media distribution cartridges is disposed in a respective one of the plurality of holes and includes a cylinder and a spool assembly that is disposed in and displaced relative to the cylinder. The electronic control unit operates at least one electromagnetic valve to control operating media flow via the operating media distribution system.

Abstract: A fluid distribution and control valve for respiratory gas delivery systems. The valve has a body which is defined by four internal zones. Each zone is connectable to an external fluid circuit and a mobile structure. The mobile structure can move into four positions. The different positions of the mobile structure determine which of the zones are in fluid communication with each other. The valve may also be used to in a pilot's mask to supply oxygen to the pilot from a main source or from a secondary source.