Abstract: The invention relates to a releasable non-return valve, in which a connection between a working chamber and a connector chamber may be closed by a non-return piston and opened by the opening movement of a release piston which may be pressurized with a release pressure. The non-return piston, discharge piston and release piston are arranged concentric to each other with the release shaft in the common valve axis. The valve has a cartridge embodiment with a non-return valve cartridge which may be inserted in the valve housing and a discharge valve cartridge independent of the non-return valve cartridge. The release shaft extends through the non-return piston with a sliding seal and engages behind the piston base by means of a stepped diameter for opening. The discharge piston is pressure compensated on both sides by pressurization with the working pressure.

Abstract: An evacuating valve includes a chamber port structure to be connected to a vacuum vessel in which a plasma is produce to create a plasma atmosphere, a pump port structure to be connected to a vacuum pump; a valve casing defining a passage connecting the chamber port structure and the pump port structure, and a valve mechanism for opening and closing the chamber port structure. At least two expended parts are formed by expanding an end part of the inside surface of the chamber port structure, and the valve element has a large part capable of being pressed against the valve seat with the sealing member held between the large part and the valve seat, and at least two small parts capable of being fitted in the expanded parts of the chamber port structure.

Abstract: A chemical liquid control valve is provided with a barrier on an outer circumferential end portion of a protruding part (an outer circumferential bottom portion of a valve seat). The barrier is placed so that an angle between the center line of an outlet passage and the line extending between the center of a valve port and each end of the barrier. The barrier is designed to have a height relative to a contact surface of the valve seat with a valve element is substantially half of the travel distance of a diaphragm valve element.

Abstract: The invention relates to a valve intended in particular for sanitary applications, comprising a body in which there are a first and a second perpendicular duct for the flow of a fluid to be shut off; a closure member acts in the valve body to close and open the first duct. The closure member is constituted by a central core with a flexible, circular ring extending around it and has a head having a diverging profile which closes and opens the first duct as a result of the action of the actuator means.

Abstract: A closure device for closing an opening in a wall in a vacuum-tight manner comprises a closure plate, a carrying unit which carries the closure plate and which has at least one longitudinal piston-cylinder unit, and a base unit which carries the carrying unit and has at least one transverse piston-cylinder unit. A closing cylinder space of the at least one longitudinal piston-cylinder unit is connected to a closing cylinder space of the transverse piston-cylinder unit, or of at least one of the transverse piston-cylinder units, by means of a closing pressure gas channel, and an opening cylinder space of the at least one longitudinal piston-cylinder unit is connected to an opening cylinder space of the transverse piston-cylinder unit, or of at least one of the transverse piston-cylinder units, by means of an opening pressure gas channel.

Abstract: A valve actuator comprising a lower housing comprising a mounting spool that is operable to couple to a valve body. A rotating sleeve is disposed within the lower housing and coupled to a stem connector. A fixed sleeve in disposed within the lower housing and includes a first slot disposed therethrough. A second slot is disposed in the rotating sleeve, wherein at least one of the slots is a helical slot. An axle engages both the first slot and the second slot. A shaft is coupled to the axle and extends through a connector flange that is coupled to an upper end of the lower housing. A piston is coupled to the shaft and movably disposed within an upper housing that is coupled to the connector flange. Axial movement of the piston within the upper housing will result in rotational movement of the rotating sleeve.

Abstract: A fluid control device 1 has an upper space S1 formed between and defined by the upper surface of a piston 10 and the lower surface of top wall 8a of an upper casing 8, and a lower space S2 formed between and defined by the lower surface of the piston 10 and the upper surface of bottom wall 7a of a lower casing 7. A compression coil spring 11 for biasing the piston 10 is disposed in one of the upper space S1 and the lower space S2, and a compressed air admitting passage 15 communicates with the other space.

Abstract: A pinch valve is provided with a main body (10) accommodating a tube body (11), a cylinder body (2) having an upper cylinder portion (17) and a lower handle support portion (3), a piston accommodated in the cylinder portion, a pressing piece (9) fixed to the piston for pressing the tube body, a cylindrical handle (1), a hollow stem (4), and a piston pusher (5, 6). The handle has a female screw portion, and a male screw portion having a pitch larger than the pitch of the female screw portion and adapted to be screwed with the female screw portion formed on the handle support portion. The stem has a male screw portion adapted to be screwed with the female screw portion of the handle on outer periphery, and is accommodated in the cylinder body. The piston pusher is inserted into the stem so that the bottom end surface thereof comes into contact with the top end of the piston and is urged toward the piston by a spring.

Abstract: The present invention relates to a valve unit for container filling machines, particularly for bottle fillers. More particularly, the present invention relates to a valve unit (1), particularly for machines for filling containers (8), comprising a hollow body (2) in which a plug (3) is slidably housed and a guide means (14) for the said plug (3), a passage (9) being formed in the said hollow (2) for a fluid (7) for filling the said container (8), characterized in that the said passage (9) for the said filling fluid (7) is separated from the said guide means (14) and from the said plug (3) by an isolating and sealing membrane (32), the said membrane being open at the bottom in such a way as to allow a tip (30) of the to protrude downwards.

Abstract: A nitrous oxide or fuel control valve has flow control of nitrous oxide from a fluid-delivery aperture (7) or flow control of fuel from a fluid-delivery aperture (8) into a injection nozzle (22) of an intake manifold of an engine by actuation of an adjuster coupler nut (11) with an actuation piston (14) that is actuated with gas pressure from an actuation-pressure source (43) with an actuation on/off valve(25). It can be structured for low-weight, short-term needs for racing and other sports uses or for heavier long-term needs of engines.

Abstract: A suck back valve includes an ON/OFF valve mechanism which opens/closes a fluid passage by displacing a valve member together with a first piston under an action of a pressure fluid supplied into a first cylinder chamber, and a suck back mechanism which has a suction member formed deformably in a flow chamber to suck a pressure fluid contained in the fluid passage by displacing the suction member together with a second piston under an action of the pressure fluid supplied to a second cylinder chamber. The ON/OFF valve mechanism and the suck back mechanism are assembled coaxially and integrally.

Abstract: An automatic-and-manual operation composite valve includes a valve main body into which an air is supplied and from which the air is discharged, a piston provided within the valve main body to be vertically movable by means of the air supplied or discharged and a snapping force of a spring attached to the piston, a valve body provided within the valve main body, and opened and closed by the piston, an air switch valve portion provided within the valve main body for switching air supply and air discharge and a manual operation mechanism portion for operating the air switch valve portion.

Abstract: A vacuum regulating valve has high controllability, wherein the opening of a valving member can be quickly and accurately controlled by using a small and inexpensive electric motor. In accordance with a signal indicative of a pressure set value and a pressure signal from the pressure sensor, the main controller in the valve control section outputs a signal for setting the opening of the valving member to a motor controller that controls the electric motor, and performs control to cause a pilot fluid to be supplied to a pressure receiving chamber of the piston, thereby causing the piston to move to the position of abutment with the stopper.

Abstract: A hydraulic pressure compensation system for valve actuator assemblies is described having particular application for subsea wellhead installations. The compensation system includes at least one valve actuator assembly having a housing that retains a reciprocable piston therewithin. The piston is spring biased into its fail safe configuration. The valve actuator assembly is hydraulically associated with an accumulator reservoir that defines a closed fluid reservoir and an open fluid reservoir that is exposed to ambient pressures. The two chambers are separated by a membrane. The valve actuator assembly is also operationally associated with a fluid pressure intensifier that boosts the ambient pressure of the accumulator so that an increased fluid pressure may be transmitted to the actuator assembly to bias the actuated valve toward its fail safe configuration. In a described embodiment, the fluid pressure intensifier comprises a housing that defines a chamber having a fluid inlet and fluid outlet.

Abstract: Methods and an apparatus for providing an intrinsically safe chamber door for a processing chamber capable of operating at high pressures are provided. One exemplary apparatus includes a processing chamber for a substrate where the chamber is configured to operate at a positive pressure. The processing chamber includes a port loading slot for providing access for the substrate into and out of the chamber. A chamber door positioned inside the chamber is included. The chamber door is configured to seal against an internal surface of the chamber thereby blocking access through the port loading slot. An internal pressure of the chamber assists in sealing the chamber door against the internal surface of the chamber. Also included is a door actuating mechanism configured to move the door along a door path where the door path is positioned at an angle to a path to be traversed by the substrate.

Abstract: A two stage solenoid control valve is described. The control valve opens and closes using a single source of pressurized fluid. This source of pressurized fluid may be transmitted through the solenoid control valve and on to a downstream valve such as a bleed valve in a gas turbine engine.

Abstract: There is disclosed a flow control valve which regulates a flow rate by determining a stop position of a piston by contact in an opened state, and which enables remote and high-precision flow rate regulation. In a closed state, an urging force of a return spring acts on a piston, bringing a diaphragm into close contact with a valve seat. In this state, when compressed air is supplied into a pilot chamber, moving the piston, the diaphragm is brought out of contact with the valve seat. Then, the piston comes into contact with a nut and the diaphragm is stopped providing a fixed clearance between the diaphragm and the valve seat. An opened state is established. Of course, the nut can be moved to any desired position by means of a serve motor or the like, so that a position at which the piston comes into contact with the nut can be changed.

Abstract: A diaphragm valve capable of increasing durability of a diaphragm comprises a valve body internally formed with a valve chamber having an open upper end and a suck-back chamber having an open lower end, between an inlet passage and an outlet passage, and a through hole which provides communication between the valve chamber and the suck-back chamber. The open end of the valve chamber is closed by a first diaphragm which is brought into and out of contact with a valve seat. The open end of the suck-back chamber is closed by a second diaphragm. The first and second diaphragms are substantially identical in shape. Each circumferential edge portion of the first and second diaphragms is tightly retained by a retaining member mountable to the valve body so that the diaphragms are curved outwardly with respect to the valve chamber and the suck-back chamber respectively.

Abstract: An indicator-equipped flow regulating valve includes a valve body through which a fluid flows, a connecting body connected to an upper portion of the valve body, a housing connected to an upper portion of the connecting body, a piston arranged in the connecting body and the housing and displaceable when pressed by the pilot air, a shaft connected to the piston, a diaphragm connected to a lower end of the shaft and seated on a valve seat formed in the valve body, a flow regulating section regulating the flow rate of the fluid flowing through the valve body, and an indicator section indicating an opened/closed state of the diaphragm.

Abstract: A torque-transmitting mechanism control valve disposed between a hydrostatic source of pressure and a torque-transmitting mechanism is effective to direct fluid pressure to engage the torque-transmitting mechanism when a control pressure is present, effective to retain the valve closed when source pressure is present but control pressure is not, and to retain the valve closed when torque-transmitting apply pressure is present and source pressure is not and control pressure is not present.

Abstract: A valve spring mechanism is provided which is suitable for use with the inlet or exhaust valves of an internal combustion engine, and includes a valve head and a valve stem. The mechanism includes a piston/cylinder arrangement in which the cylinder surrounds a portion of the valve stem to define a chamber. The piston is slidable and sealingly mounted on the valve stem. The mechanism also has force transmitting means for transmitting the force produced on the piston by gas pressure within the chamber to the valve stem, and a spring operating on the piston and the stem of the valve for applying a force to the stem tending to close the valve in the event of failure of chamber gas pressure. The spring is positioned to maintain it in a compressed condition during normal operation of the mechanism as a result of gas pressure within the chamber.

Abstract: A pneumatically controlled needle valve including a cylindrical body intended to be mounted in a bore of a device, two annular sealing surfaces delimiting a chamber connected to a compressed-air supply device, a first compartment arranged inside the body communicatively with the chamber, a second compartment, a piston separating the first and second compartments, a rod having the piston secured thereto, the rod protruding axially from the body, a needle disposed on the rod intended, depending on a position of the needle, to bear or not to bear against a seat of the bore, at least one spring disposed in the second compartment, the spring acting on the rod in a direction for closing the valve by pressing the needle onto the seat, while air under pressure from the compressed air supply device acts on the piston in the opposite direction, the rod passing with sealing through a front end of the body, and a plug for closing a rear end of the body, the plug being connected to the body in such a way as to be prevente

Abstract: A vacuum regulating valve is capable of precisely controlling the flow of a fluid so that the flow rate may increase gradually in an initial stage of a valve opening operation. The vacuum regulating valve includes a valve casing having a valve chamber and provided with a first opening connected to a vacuum vessel and a second opening connected to a vacuum pump, a valve seat, a valve element seated on the valve seat, a valve stem connected to the valve element, a bellows sealing the valve stem therein, and a baffle member attached to the back surface of the valve element and surrounding the bellows. The baffle member is formed in an axial length such that the baffle member is able to cover the second opening entirely when the valve element is seated on the valve seat.

Abstract: The present invention provides a filling valve which affords an excellent sterilization capability and a high maintenance capability. The valve includes a tubular nozzle 4, an operating rod 6 which is fitted in the nozzle 4 so as to be elevatable, and an opening/closing valve 22 formed by a valve seat 10a on the internal surface of the nozzle 4 at its bottom end and a valve element 6a formed at the bottom end of the operating rod 6. A portion 10c of a reducing diameter which gradually reduces the cross-sectional area of the filled liquid passage 10 in a downward direction and a portion 10e of an increasing diameter which gradually increases the cross-sectional area of the filled liquid passage 10 in the downward direction are formed on the internal surface of the nozzle 4 at an upper portion thereof. A plurality of straightening vanes 36 are formed on the internal surface of the nozzle 4 at a location below the portion 10e of an increasing diameter.

Abstract: A pneumatically actuated fluid control valve includes a piston and a piston actuator including a permanent magnet. First and second piston actuator positions for magnetically disposing the piston in valve open and valve closed positions are provided. A pneumatic actuator driving circuit pneumatically moves the piston actuator from one to the other of first and second piston actuator positions to dispose the piston in the open and closed positions. The valve includes an annular valve assembly. One valve assembly position is a normally closed position and a positive air flow control signal moves the piston to open the valve. Another valve assembly position is a normally open position and a positive air flow control signal moves the piston to close the valve.

Abstract: A check valve arrangement for a hydraulic consumer which permits connecting the hydraulic consumer selectively to a medium pressure line or a high pressure line. The valve arrangement comprises a medium pressure switching valve 10, a high pressure switching valve 14, and a check valve 6 downstream of these valves. The check valve 6 is constructed as a combined sliding and seat valve and comprises control surfaces 28, 29, 38 for the medium pressure P1, the high pressure P2, and the pressure applied to a consumer line 5, i.e., the pressure applied to the hydraulic consumer. The control surfaces are dimensioned such that a connection of the hydraulic consumer to the high pressure line can occur only when a predetermined limit pressure is reached in the hydraulic consumer.

Abstract: A linear actuated disk valve for a fluid conveyance system constructed with a valve body having an internal chamber and a passage through the valve body, the valve body having opposite ends with external connectors that continue the passage and that are connectable to other components in the fluid conveyance system, the improvements being a displaceable cam action closure member in the chamber of the valve body, the closure member having a disk retainer assembly with a disk retainer and at least a pair of circular closure disks engageable with the disk retainer formed by a cam on the retainer and a cam track on the disk being laterally displaced on initial linear displacement of disk retainer with the disk retainer being connected to an actuator shaft with an improved sealing assembly for sealing the shaft at the top of the valve body.

Abstract: A piston is arranged in a connecting body. A first diaphragm is provided at a lower portion of a shaft which is displaceable in the axial direction together with the piston. A second diaphragm is provided at an upper position spaced by a predetermined distance from the first diaphragm so that the second diaphragm is substantially in parallel to the first diaphragm. When the fluid permeates through the first diaphragm, the fluid is blocked by the second diaphragm. A buffering spring member is installed in a space which is defined between the second diaphragm and a first skirt section formed to extend radially outwardly from a main body section of the first diaphragm, and the pressing force exerted on the first diaphragm and the second diaphragm is reduced thereby.

Abstract: A flow control device comprises an inlet port through which fluid is supplied, an outlet port through which the fluid is delivered, a valve body which is arranged in a passage between the inlet port and the outlet port so as to open and close the passage, the flow control device further comprising a valve body guide means which urges downwardly and pulls upwardly the valve body so as to allow the fluid in the passage to flow at a flow rate which is lower than a basic control rate of the flow control device.

Abstract: An apparatus for manually opening a normally-closed valve includes a value and a hand-operated valve opening jig. The valve includes a working rod for operating a valve element which is moved to close and open a conduit; a cylindrical holder fixed to the working rod, and to which the hand-operated valve opening jig can be detachably attached from the outside of the housing; a biasing member which biases the working rod to close the conduit; and a pressure chamber which is supplied with a working fluid to move the working rod to make the valve element open the conduit. The hand-operated valve opening jig includes a manual-opening attachment which can be detachably attached to the cylindrical holder; and an operational member which is operated to move the working rod in a direction to make the valve element open the conduit via said manual-opening attachment.

Abstract: Vacuum flitch-retaining systems use vacuum valves having pressure-operated reciprocatable pistons capable of high valve closure forces to provide the reliable closure of their associated valve seats, notwithstanding the presence of resin, wood fibers, dirt and other debris that may be present in the valves and on the valve seats, to control the application of vacuum to vacuum cells formed in a flitch-retaining table.

Abstract: A hydraulic damper cylinder 270 is provided for an electromagnetic actuated internal combustion engine cylinder valve 20. The damper includes a piston 68 slidably mounted within the damper cylinder 270. The piston 68 bifurcates the cylinder 270 into a first control volume 74 and a second control volume 76. The first and second control volumes are fluidly connected by an inboard flow path 372. Along the extreme ends of travel, the flow path 372 is blocked by the piston 68 and damping occurs through fluid transfer through an outboard flow path 374.

Abstract: A chamber port to which a vacuum chamber is connected and a pump port to which a vacuum pump is connected are formed on a valve body of a vacuum regulating valve. A valve plug includes a plate and a nose which is connected to the plate by screw members, and closes the chamber port by a pressure fluid. The maximum outer diameter of the nose is smaller than the inner circumferential diameter of the chamber port. The nose is detached through the chamber port.

Abstract: A device and control method for actuating valves of a motor vehicle internal combustion engine including at least a controlled hydraulic actuator actuating the associated valve that is provided in the form of a cylinder. A mobile piston connected to the valve delimits two opposite hydraulic pressure chambers each supplied with an incompressible fluid and pressure regulated by a control unit such that the pressure prevailing in one of the chambers is alternately higher/lower than that which prevails in the other chamber to actuate the valve. Each pressure chamber of the cylinder is capable of communicating with a corresponding actuating hydraulic pressure source, which includes a pneumatic return mechanism for the fluid.

Abstract: An air-blow valve configured for clean-in-place capability is provided. The valve comprises a valve body defining a valve seat and internal fluid passageways. The valve further comprises valve components disposed within the valve body, including a plug, a piston, and a spring. The valve is separately operatively connected to a pressurized-air source and to a sanitizing-fluid source. In operation, the spring biases the piston, causing the plug to engage the seat, to prevent undesired fluid flow between the passageways and the connecting conduits. Alternatively, the spring biases the piston, causing the plug to disengage the seat, allowing fluid flow between the passageways and connecting conduits. Pressurized air is used to space the plug from the seat to achieve flow whenever desired, or alternatively to engage the seat to prevent fluid flow when desired.

Abstract: A linear actuated disk valve for a fluid conveyance system constructed with a valve body having an internal chamber and a passage through the valve body, the valve body having opposite ends with external connectors that continue the passage and that are connectable to other components in the fluid conveyance system, the improvements being a displaceable cam action closure member in the chamber of the valve body, the closure member having a disk retainer assembly with a disk retainer and at least a pair of circular closure disks engageable with the disk retainer formed by a cam on the retainer and a cam track on the disk being laterally displaced on initial linear displacement of disk retainer with the disk retainer being connected to an actuator shaft with an improved sealing assembly for sealing the shaft at the top of the valve body.

Abstract: A modular, actuated valve controlled by means of pressure fluids comprising a head plate mounted on a housing plate mounted on a base plate, held together by screws, having a piston with attached valve spindle and a pressure relief space provided between the flow passage 28, 29 and the piston.

Abstract: An apparatus for manually opening a normally-closed valve includes a value and a hand-operated valve opening jig. The valve includes a working rod for operating a valve element which is moved to close and open a conduit; a cylindrical holder fixed to the working rod, and to which the hand-operated valve opening jig can be detachably attached from the outside of the housing; a biasing member which biases the working rod to close the conduit; and a pressure chamber which is supplied with a working fluid to move the working rod to make the valve element open the conduit. The hand-operated valve opening jig includes a manual-opening attachment which can be detachably attached to the cylindrical holder; and an operational member which is operated to move the working rod in a direction to make the valve element open the conduit via said manual-opening attachment.

Abstract: A cylindrical heat-generating member is disposed in a valve casing including a valve seat in a flow path connecting main ports, a valve member for opening and closing the valve seat, and a rod connecting the valve member and a piston. A first heater is mounted in the heat-generating member. The heat-generating member and a heat receiving member of the valve member are connected to each other by a heat-transfer member for expansion and contraction. As a result, the valve member is constantly heated through the heat-transfer member irrespective of its open/closed position. When the valve member is open, the heat receiving member comes in contact with the heat-generating member and the valve member is directly heated.

Abstract: The invention relates to a membrane valve, for transfer of biological and pharmaceutical products in particular, which an be opened pneumatically. By introducing air through an inlet opening (19) said air therein through a hollow spindle (4, 13, 23) reaches the space below a piston (12), lifts the latter and thus opens said valve. By providing for a hollow spindle (4, 13, 23) the supply of air can be effected in the drive portion. Interfering conducts and devices outside of said valve can thus be avoided, this permitting a more compact, room-saving construction of said valve as well as a simplified maintenance and cleaning of said valve.

Abstract: A diaphragm valve capable of increasing durability of a diaphragm comprises a valve body internally formed with a valve chamber having an open upper end and a suck-back chamber having an open lower end, between an inlet passage and an outlet passage, and a through hole which provides communication between the valve chamber and the suck-back chamber. The open end of the valve chamber is closed by a first diaphragm which is brought into and out of contact with a valve seat. The open end of the suck-back chamber is closed by a second diaphragm. The first and second diaphragms are substantially identical in shape. Each circumferential edge portion of the first and second diaphragms is tightly retained by a retaining member mountable to the valve body so that the diaphragms are curved outwardly with respect to the valve chamber and the suck-back chamber respectively.

Abstract: A pneumatic valve includes a cylinder having at least one gas port for providing inflow and outflow of a gas; a piston arranged in the cylinder and performing a reciprocating, straight-line movement in response to the inflow and outflow of the gas; a first valve shaft passing through the piston and having a first end portion including a first coupling portion; and a second valve shaft including a second coupling portion and having a first end portion protruding from the cylinder, wherein the second coupling portion is coupled to the first coupling portion.

Abstract: A fill valve assembly for use in association with a filler device comprising an outer housing, a product dispensing member, a displaceable piston and a seal member. The product dispensing member is associated with the outer housing. The displaceable piston is displaceably positioned within the outer housing. The seal member is fixedly associated with the displaceable piston at one end thereof, and at least one of the outer housing and the product dispensing member, at another end thereof. The seal member is capable of maintaining fixed association throughout displacement of the displaceable piston, such that isolation of outer housing and the product dispensing member can be maintained without the use of seals having slidable engagement.

Abstract: A fueldraulic metering valve uses pressurized liquid fuel to control flow of gaseous fuel to a jet engine combustion chamber. The valve has a disconnectable body defining a piston chamber and a cavity for an interchangeable venturi nozzle module, both disposed about a stroke axis. A servo valve controls flow of the liquid fuel through the piston chamber and supply and return ports. The liquid fuel drives a piston and pintle assembly to open and close off the throat of the venturi passageway, and thereby control metering of the gaseous fuel, which flow through separate intake and exhaust ports. The gas and liquid fuel are separated by a high temperature seal. The liquid fuel is routed through the piston and a special baffle to dissipate heat transferred to the seal and piston from the hot gaseous fuel. A LVDT position transducer provides feedback to the controller for correcting position error.

Abstract: A hydraulic actuator (20) with a built-in hydrostatic pressure compensator (111) is provided. The actuator (20) includes an actuator housing (30), a compensator cylinder portion (86), a compensator piston portion (94), a first compensator piston chamber (98), a second compensator piston chamber (103), a hydraulic port (106), and a hydraulic via (108). The compensator cylinder portion (86) is located within the actuator housing (30), is fixed relative to the housing (30), and has a compensator cylinder internal chamber (88) formed therein. The compensator piston portion (94) slidably fits within the compensator cylinder internal chamber (88). The first compensator piston chamber (98) is formed between a first side (101) of the compensator piston portion (94) and the compensator cylinder portion (86). The second compensator piston chamber (103) is formed between a second side (102) of the compensator piston portion (94) and the compensator cylinder portion (86).

Abstract: The present invention relates to a valve spring mechanism suitable for use with the inlet or exhaust valves of an internal combustion engine. More specifically, the invention provides a valve spring mechanism for a poppet valve (101) which comprises a valve head (102) and a valve stem (104). The mechanism comprises a piston (109) and cylinder (108) arrangement in which the cylinder (108) surrounds a portion of the valve stem (104). The piston (109) is slidingly and sealingly mounted on the valve stem (104), and the piston (109) and cylinder (108) define a chamber (110). The mechanism also comprises force transmitting means for transmitting the force produced on the piston (109) by gas pressure within the chamber (110) to the valve stem (104); and a spring (113) operating on the piston (109) and the stem of the valve for applying a force to the stem of the valve tending to close the valve in the event of failure of gas pressure within the chamber (110).

Abstract: A yoke member for a fluid control valve is provided. The yoke member includes a plurality of passages for connecting an air supply line from a control instrument associated with the actuator to the actuator and a plurality of bores for directly attaching the control instrument to the yoke member. The yoke member may include symmetrically disposed passages so that the instrument may be mounted to either side of the yoke member. An adapter block may be used to connect the yoke member to a new NAMUR standard mounting pad.

Abstract: To provide a maintenance-easy two-port valve capable of easily assembling and disassembling a valve body and a bonnet, and preventing the bonnet from being detached from the valve body by an erroneous operation. In a two-port valve 1 having attachment means for detachably attaching a bonnet 21 to a valve body 2, the attachment means includes a plurality of shafts 16 fixedly attached to a valve body 2 and each having an engagement groove 17 on an upper end portion, a handle 31, a plate 41 rotatably provided between an upper end portion of the bonnet 21 and the handle 31 and having an engagement groove 43 engaged to or disengaged from the retaining groove 17 by rotating the plate 41, and an engagement pin 35 engaged with an engagement hole 44 provided in the plate 41 at a push-down position of the handle 31, transmitting the rotation of the handle 31 to the plate 41 and fixedly attached to the handle 31.

Abstract: A hydraulic choke for a flow stream from a well with large diameter particulate matter of a finite amount includes an inlet with a defined inlet flow area and a chamber with a defined chamber flow area. The inlet flow area is about ⅓ the size of the chamber flow area. The choke further includes a gate in the chamber surrounded by a housing separated from the chamber wall, a piston for engaging the gate against a seat, a studded outlet in communication with the chamber in the same plane as the inlet, and a studded solids removal outlet in communication with the chamber. The studded solids removal outlet is oriented approximately 90 degrees from the inlet position to permit the large diameter particulate matter to fall from the flow stream and into a solids receptacle for collecting the large diameter particulates matter. The solids receptacle is in communication with the studded solids removal outlet.

Abstract: A suck back valve has a volume-varying mechanism including a cylindrical flexible member which has a flow chamber formed therein for communicating with a fluid passage having a first port and a fluid passage having a second port, a fixing member which fixes a part of the outer circumferential surface of the cylindrical flexible member to a joint section, and a hook member which increases the volume of the flow chamber by expanding and deforming the outer circumferential surface of the cylindrical flexible member.