Abstract: A valve armature of a solenoid valve includes an armature body having a blind hole in which an elastomer seal is vulcanized in. The armature body is manufactured in a cold forming process, in which a final axial linear dimension of the armature body is also determined. Furthermore, a valve having such a valve armature is presented.

Abstract: A seal ring is made of resin, applied to a valve body that changes an opening degree of a fluid passage through which a fluid passes, and that seals, when the valve body fully closes the fluid passage, between an inner peripheral surface defining the fluid passage and an outer peripheral edge of the valve body. The seal ring includes a ring main body fitted in an outer peripheral groove formed on the outer peripheral edge.

Abstract: Provided are sealing member for electronic valve, electronic valve with sealing member, electronic valve with static sealing structure, and electronic valve with double sealing structure. The sealing member has inlet end connected to valve core and outlet end connected to connecting pipe; the electronic valve includes valve body, valve cover, flow rate control device, and the connecting pipe; the flow rate control device includes the valve core; the valve body is provided therein with valve core accommodating chamber and connecting pipe connection port; the valve core is disposed in the valve core accommodating chamber; the connecting pipe is welded to end of the connecting pipe connection port on the valve body. The electronic valve further includes the above sealing member, and the sealing member is located between the connecting pipe and the connecting pipe connection port. Meanwhile, the electronic valve includes static sealing structure and/or double sealing structure.

Abstract: A multi-port rotary plug valve may be used in a fluid delivery system of a vehicle to control flow of coolant fluid between a radiator, an electric drive motor, a battery, vehicle electronics, and one or more bypass lines. The valve may include a valve body that has radial ports at two or more levels along a height dimension of the valve body. In addition, the valve may include a plug assembly that is rotatably disposed in the valve body. The plug assembly may be made of first and second plug portions that cooperate to control fluid flow through the valve body. The valve allows valve configurations in which fluid passes between ports disposed at different axial levels of the valve body, and other configurations in which fluid passage is restricted to a single level depending on a rotational position of the plug assembly relative to the valve body.

Abstract: A valve including a housing, a solenoid arranged in the housing, a pin that can be moved by the solenoid, a cup-shaped piston connected to the pin, a seal arranged in the base region of the piston and interacts with a valve seat, and a seal arranged in the region of the open end of the piston and seals the piston from the housing. The seal interacting with the valve seat has an outer diameter which approximately corresponds to an outer diameter of the seal at the open end of the piston.

Abstract: A compact manifold ball valve having a valve body, valve ball, valve stem and two piece retainer system; the valve body including a valve chamber having first and second ends, and a first flow passage intersecting the valve chamber and valve ball. The valve ball can be trunnion supported and include pair of movable seat assemblies that can be used to seal the valve ball to the valve body. A two piece retainer can be used to hold in place the valve components, the two piece retainer including a first section which moves only linearly along with a second retainer piece that is a threaded ring that rotationally locks in place the first section of the two piece retainer. The two pieces of the retainer can be symmetrically located about the centerline of the flow passage of the valve body.

Abstract: Disclosed is a vacuum valve including a valve closure and a preferably pneumatic or electro-pneumatic drive unit having a pressure medium, said drive unit being coupled to the valve closure. The vacuum valve also has a pressure sensor such that a pressure of the pressure medium can be measured.

Abstract: A plasma processing apparatus capable of achieving a uniform plasma space therein is provided. The plasma processing apparatus includes a processing vessel, a mounting table, a shield member, a shutter for an opening configured to be moved up and down, a first driving unit and a second driving unit. The processing vessel has a sidewall, and the sidewall is provided with a transfer path through which a processing target object is carried-in/carried-out. The mounting table is provided within the processing vessel. The shield member is provided along an inner surface of the sidewall to surround the mounting table and provided with an opening facing the transfer path. The first driving unit is configured to move the shutter up and down. The second driving unit is configured to move the shutter in a forward-backward direction with respect to the shield member.

Abstract: A thin air bag/bladder, which when packaged and attached to an air valve system is inserted into an inflatable boat, or inflatable structure to repair a puncture or leak. This valve and adapter system is used to fasten and lock the valve structure in place during use. After attachment to the air valve system, the packaged bag is inserted into the inflatable structure with a collapsible tent pole/stick through the pre-existing valve opening with newly installed adapter. A valve system and bag/bladder will be needed for each separate air chamber of the boat design, whatever the length, diameter, or number of individual chambers. This will allow a replacement bag to be user retrofitted at any later time, whenever needed to repair a puncture or leakage, in any inflatable boat, life-raft or inflatable device.

Abstract: A valve member driving device capable of bidirectional movement includes: a main body with two gas chambers, a first gas-inlet opening, a first gas-inlet channel, a second gas-inlet opening, and a second gas-inlet channel; a first piston rod with a first flow passage; a second piston rod with a second flow passage; a first guide rod extending into the first flow passage at one end and having a gas socket and a gas hole in communication with the gas socket; a second guide rod extending into the second flow passage at one end and having a gas-guiding flow passage; a valve cylinder fixedly provided on the first piston rod and having a valve-cylinder gas chamber, an advance channel, a withdrawal channel, and a valve-cylinder piston rod; and a valve member fixedly provided on the valve-cylinder piston rod.

Abstract: A gate valve and gate member for a gate valve, which may be used for hydrocarbon well fracturing operations with a fracturing fluid, or “frac fluid”, includes a seat, having a seat end face which is in sliding contact with a gate member that has a sealing face surface with at least one recess formed in the sealing face surface of the gate member.

Abstract: A control system provides automated control of gas washout of a patient interface, such as a mask or nasal prongs. A gas washout vent assembly of the system may include a variable exhaust area, such as one defined by gears, radial exhaust revolvers and/or flow diverters for a conduit having a variable gas passage channel. The vent assembly may be attached substantially near or included with the patient interface. An actuator of the assembly, such as a solenoid, motor or voice coil, manipulates the vent assembly. The actuator may be configured for control by a processor to change the exhaust area of the vent assembly based on various methodologies including, for example, sleep detection, disordered breathing event detection and/or leak detection.

Abstract: An isolation valve comprising: a housing having an internal surface within the housing, the internal surface having a first outlet and second outlet; an air gate having an outward face opposite the internal surface, the air gate located within the housing and configured to move to at least one of a first position blocking flow to the first outlet, a neutral position blocking flow to neither the first outlet nor second outlet, and a second position blocking flow to the second outlet; a seal groove located on the outward face of the air gate; a seal located within seal groove, the seal configured to form a sealed connection with the internal surface around at least one of the first outlet when in the first position and the second outlet when in the second position; and a retainer configured to secure the seal within the seal groove using a fastening mechanism.

Abstract: A shutter structure includes a rotary shaft, a shutter plate, an upper rib and at least one lower rib. The rotary shaft is provided in a cylindrical duct line. The shutter plate rotates about the rotary shaft and switches between an open state and a closed state. The shutter plate has a peripheral edge portion, a curved portion, and a shutter plate shaft portion. The peripheral edge portion includes an upper shielding plate and two lower shielding plates. The lower shielding plates are located symmetrically to each other with respect to a center line. The center line is perpendicular to the shutter plate shaft portion. When the shutter plate is in the closed state, the upper shielding plate comes into contact with the upper rib from an upstream side, and the lower shielding plates come into contact with the at least one lower rib from a downstream side.

Abstract: Provided is a liquid discharge valve including a housing configured with an inlet port coupleable to a liquid line, a liquid outlet port, an inlet chamber accommodating a pressure responsive closing mechanism disposed between said inlet port and said liquid outlet port and configured for selectively opening a liquid flow path therebetween, a control chamber being in flow communication with the inlet chamber via a restricted fluid passage, a gas operated valve being in flow communication with the control chamber, and a discharge pilot valve being in flow communication with the control chamber.

Abstract: A vacuum valve including a valve housing with seat surrounding a first opening with a sealing surface is disclosed. A valve disk having a first disk section and a second disk section tightly mounted inside an outer boundary of the first disk that is movable parallel to an opening axis. A drive is connected to the first disk section. The first disk section includes a first bearing surface configured to contact the sealing surface in the closed position. The outer boundary has a radially inwardly oriented inner surface. The second disk section has a radially outwardly oriented outer surface configured to contact the inner surface sealing a second contact area. At least for determined radial angles about a center of the valve disk, a first radial distance from the center to the first bearing surface is shorter than a second radial distance from the center to the second contact area.

Abstract: A valve housing that has a flow passage. Arranged in the flow passage are a valve seat that includes a valve hole, valve body that can be seated on the valve seat, and a section of a rotary shaft with the valve body fixed to the tip thereof. A ring-shaped seat surface is formed in the valve hole of the valve seat. A ring-shaped sealing surface corresponding to the seat surface is formed on the perimeter of the disc-shaped valve body. By rotating the rotary shaft, the valve body rotates open from a closed state in which the valve body is seated on the valve seat and the sealing surface is in contact with the seat surface. A tapered upstream-side flow regulating part is provided in the valve hole of the valve seat, so as to widen from the seat surface toward the upstream side of the EGR gas flow.

Abstract: A tub spout includes a fitting, an inflexible portion, and a flexible portion. The fitting is configured to be coupled to a plumbing fixture and to receive water from the plumbing fixture. The inflexible portion is configured to receive the fitting or configured to have the fitting integrated therein, be held adjacent a wall by the plumbing fixture, and receive the water from the plumbing fixture. The flexible portion is configured to be coupled to and extend from the inflexible portion, selectively receive the water from the inflexible portion, and selectively provide the water out of the tub spout.

Abstract: A side-opening sleeve valve having an inner barrel with a shaped opening through its cylindrical wall having a longer size along the axis of the inner barrel, and a co-annular outer barrel having shaped opening through its cylindrical wall having a longer size along the axis of the outer barrel. The inner barrel is rotatable relative to the outer barrel between a first open position where the shaped openings overlap to form a side opening into the sleeve valve, and a second closed position where the shaped openings do not overlap. The side opening has an effective axial opening size and an effective lateral opening size in a ratio of at least about 2:1. The side-opening valve is useful with water-less toilet that can empty into the side-opening valve when opened, and when closed, a pigging fluid flush system pushes the waste in the side-opening valve to a sewage system.

Abstract: A compressor assembly may include a compressor case disposed about an axis. A bleed valve may be disposed about the compressor case to translate axially and/or rotationally relative to the compressor case. A first seal may be disposed in a forward seal housing of the bleed valve a first radial distance from the axis. A first sealing wall may be fixed relative to the compressor case and configured to engage the first seal. A second seal may be disposed in an aft seal housing of the bleed valve at a second radial distance from the axis. The first radial distance may be substantially equal to the second radial distance. A second sealing wall may be fixed relative to the compressor case and configured to engage the second seal.

Abstract: An isolation valve comprising: a housing having an internal surface within the housing, the internal surface having a first outlet and second outlet; an air gate having an outward face opposite the internal surface, the air gate located within the housing and configured to move to at least one of a first position blocking flow to the first outlet, a neutral position blocking flow to neither the first outlet nor second outlet, and a second position blocking flow to the second outlet; a seal groove located on the outward face of the air gate; a seal located within seal groove, the seal configured to form a sealed connection with the internal surface around at least one of the first outlet when in the first position and the second outlet when in the second position; and a retainer configured to secure the seal within the seal groove using a fastening mechanism.

Abstract: Valves having a sprung gate of various constructions are disclosed. In one embodiment, the sprung gate includes a first endless elastic band having an inner perimeter defining an open space sandwiched between a first gate member and a second gate member that each define an opening therethrough in an open position portion thereof. The first endless elastic band is sandwiched therebetween with its open space oriented for alignment with the opening in both of the first and second gate members, which are aligned with one another to form a passage through the sprung gate. In one aspect, the first endless elastic band in positioned inward a distance from the outer sides of the first and second gate members and spaces the first gate member a distance apart from the second gate member thereby defining a channel having a bottom defined by the first endless elastic band.

Abstract: A valve stem and valve core assembly and a valve including a valve stem and valve core assembly. The valve stem and valve core assembly includes a valve stem and a valve core that sleeves the valve stem. The assembly includes an adjusting device arranged on the valve stem, and an elastic element arranged between the adjusting device and the valve core. A clearance exists between the valve core, the valve stem, and the adjusting device, so that the valve core can move relative to the valve stem, such that the valve can have a good closing performance.

Abstract: A vane pack assembly (25) for a variable geometry turbocharger (10) including a an upper vane ring (28) and a lower vane ring (30) and a plurality of single-axle, self-centering adjustable guide vanes (26) disposed in a turbine housing (20). The plurality of guide vanes (26) include a post (50) having a vane (52) formed integrally therewith. Each post (50) includes a convex self-centering pivot feature (56a, 56b) at one end adapted to seat in a complementary shaped concave self-centering pivot recess (48) of the lower vane ring. The vanes (52) are positioned between the upper and lower vane rings (28, 30) and pivot to control exhaust flow to a turbine wheel. The self-centering pivot features compensate for movement or deformation of the turbine housing (20) and vane rings (28, 30) due to the effects of differential thermal expansion.

Abstract: Apparatus for delivering controlled amounts of granular resin into a conveying conduit includes a hopper for storing the resin, an air cylinder, a double-ended piston within the air cylinder, passive and active piston rods extending from opposite sides of the piston out of the ends of the cylinder, and a slide gate connected to the active piston rod, with the slide gate being positioned between a discharge opening of the hopper and an opening in the conveying conduit.

Abstract: An exhaust gas recirculation valve device for a vehicle includes: a valve housing having an exhaust gas inlet port and an exhaust gas outlet port; a flap valve rotatably mounted on the valve housing to open and close the exhaust gas outlet port; a valve shaft fitted to penetrate the flap valve and coupled to the flap valve so as to rotate integrally with the flap valve; a lever in which one end of the valve shaft is fitted to penetrate; a spring fixed at the lever and mounted on an exterior circumferential surface of the valve shaft; a bush inserted into the exterior circumferential surface of the valve shaft between the spring and the flap valve in a shaft direction; and a thrust washer installed between the flap valve and the bush.

Abstract: The present invention relates to an exhaust-gas heat exchanger for a motor vehicle, having an encircling heat exchanger duct with a bypass pipe situated at the inside, a control flap being provided for conducting an exhaust-gas flow through the heat exchanger duct or through the bypass pipe, said exhaust-gas heat exchanger being characterized in that the control flap has an opening with a pipe stub-like section, the pipe stub-like section being in flow-conducting contact with an inlet opening of the bypass pipe in a bypass position, and the control flap being rotatable from a bypass position into a transfer position, in which the inlet is closed.

Abstract: A piston device and a pressure regulator including the piston device. The piston device includes a piston body and a baffle plate having a surface provided with openings. The baffle plate is arranged in the piston body and divides the piston body into an upper first area and a lower second area. The piston device beneficially improves the stress balance of the first area and the second area, thereby improving the stability of the overall system.

Abstract: A low-drag seal arrangement for a thermal management valve including a housing having a chamber and at least one bore for flowing a fluid medium through the at least one bore between a location exterior of the housing and the chamber of the housing. A rotor is configured to rotate within the chamber of the housing relative to the bore. The rotor moves between a closed position where the flow of fluid medium through the at least one bore is blocked, an open position where the fluid medium flows through the at least one bore and an intermediate position where the flow of fluid medium through the at least one bore is partially restricted by the rotor's position relative to the bore. The low-drag seal arrangement also includes a face seal piston positioned within the at least one bore and configured to move axially within the bore.

Abstract: The invention relates to a shut-off device for valve systems of industrial plants, in particular of chemical and petrochemical plants, with a disc (12) to shut off an opening for a fluid flow and with a seal seat (13a). The invention is characterised in that the disc (12) is arranged between the seal seat and a pressing means (26) to subject the disc (12) to a pressing force and can be pressed by the pressing means (26) against the seal seat (13a), wherein the pressing means (26) has in a housing (10) a plurality of pistons (48) and a transmission element for transmitting the pressing force to the disc (12), the transmission element being arranged between the pistons (48) and the disc (12) and extending along the disc circumference, and wherein the pistons (48) are fluidically connected by a feed line (49) for hydraulic fluid.

Abstract: A valve plug includes a cylinder, a first plug seat, a second plug seat, and a convoluted portion. The cylinder has a first and second end. The first plug seat is disposed at the first end. The second plug seat is disposed proximal to the second end. The convoluted portion is disposed between the first seat and the second seat. The convoluted portion provides flexibility for the cylinder to flex between the first plug seat and the second plug seat.

Abstract: The vacuum isolation valve includes a housing installed between a chamber and a chamber cleaning gas supply and including a tube connecting the chamber to the chamber cleaning gas supply, a tube isolator formed at a predetermined position of the tube, a first blocking unit installed to the housing, and a second blocking unit installed to the housing, for, when the first blocking unit moves in the first direction, maintaining communication between the chamber and the chamber cleaning gas supply by moving in a second direction and pressing the first blocking unit and for, when the first blocking unit moves in an opposite direction to the first direction, blocking communication between the chamber and the chamber cleaning gas supply.

Abstract: The valve bonnet assembly (1) includes a bonnet stem and a valve member supported on the stem. Rotation of the stem (16) axially moves the valve member (12) along the stem axis into and out of sealing engagement with a seat (11). The bonnet stem includes multiple start threads, and the thread pitch divided by a number of starting threads is greater than or equal to 6 and less than or equal to 9.

Abstract: A valve body and seal assembly comprises at least one seal and a valve body that may include a frusto-conical valve body impact area (also referred to as a valve seat contact portion) for sealing against a valve seat. In one embodiment, the at least one seal may comprise a first and second seal sections that comprise first and second elastomers, respectively, and an intra-seal interface where the first seal section may contact the second seal section. The first seal section may comprise a first frusto-conical seal portion, and the second seal section may comprise a second frusto-conical seal portion, each for sealing against the valve seat. A method for making a valve body and seal assembly is also provided. First and second elastomers may be crosslinked. The intra-seal interface may be planar or non-planar (i.e., may comprise, e.g., a cylindrical portion and/or a frusto-conical portion).

Abstract: Method of operating a valve (1) which connects openings (2, 3) of at least two chambers (4, 5) to one another and, for closing the openings (2, 3) of each of the chambers (4, 5), has at least one dedicated closure member (6, 7), wherein for opening one of the openings (2, 3), the chamber (4, 5) assigned to said opening (2, 3) has generated in it a positive pressure which is higher than a current pressure in the valve-housing interior (8), wherein, by virtue of this positive pressure, the closure member (6, 7) assigned to said opening is raised up from the valve seat (10, 11) assigned to said opening (2, 3) and then, through this opening (2, 3), pressure equalization is carried out between the valve-housing interior (8) and the chamber (4, 5) assigned to said opening (2, 3). (FIG.

Abstract: A valve assembly (10) comprising two valve portions, an upper and lower valve portion (12, 14), each having a valve housing indicated generally at (16, 18), a valve seat (28, 28?) and a valve closure member (20, 20?) moveable between a first position in which the valve closure member is displaced from the valve seat and the valve is open, and a second position in which the valve closure member cooperates with the valve seat and the valve is closed, wherein the assembly has a first configuration in which the first and second valve portions engage with one another, the valve closure members being closed, and the valve closure members being disposed at a distance apart defining, with the housing, a chamber (29) therebetween, which is capable of being sealed from the surrounding environment, having an inlet (44, 44?) and an outlet (45, 46?) through which sterilizing medium may pass, and a second configuration in which the valve closure members engage with one another and are moveable from their first to their sec

Abstract: A coking drum is provided, especially for petroleum coke production, which has an approximately cylindrical basic body and also at least one inlet opening and outlet opening, a shut-off valve (1, 1?) being arranged at the outlet opening and/or inlet opening. The coking drum is characterized in that there is provided, at approximately the same height as the shut-off valve (1, 1?), at least one input opening (19, 19?) for feeding residual materials, especially from a vacuum distillation process upstream of the coking, into the coking drum.

Abstract: A valve assembly having a valve-seal on a valve member that moves between an open and a closed position within a valve support housing for controlling fluid flow, particularly for use as a shut-off valve. In many embodiments, advancing the valve member sealingly engages the valve-seal with a valve seating area of the housing to close the valve and shut-off fluid flow through the housing, while retracting the valve member moves the valve-seal away from the seating area to allow fluid flow around the valve-seal and through the valve-seating area. In many embodiments, the valve member includes a proximal handle and angled ramp that engage with a helical ramp of the housing to translate rotation of the handle into axial movement of the member between open and closed positions.

Abstract: A rotary valve is disclosed. The valve comprises a drive shaft, a rotor coupled to the drive shaft, a least one bearing surface coupled to the rotor, a stator adjacent to the rotor, at least one solid bearing surface coupled to the stator, and at least one ring bearing surface coupled to the stator.

Abstract: According to an embodiment of the invention, there is provided a slit valve, comprising: a first slit valve portion having a first window therethrough, the first window is sized to permit passage of an object through the first window; wherein the first window is surrounded by a first area of the first slit valve portion; a second slit valve portion that comprises a first sealing element and a first positioning module; wherein the first positioning module is arranged to move the first sealing element in relation to the first window; wherein at least one slit valve portion of the first and second slit valve portions comprises at least one first gas opening for emitting pressurized gas so as to assist in a creation of a first gas cushion between the first area and the first sealing element when the first sealing element is placed adjacent to the first window thus creating a seal between the first and second slit valve portions.

Abstract: A differential pressure sealing device for use with ball valves that utilizes the pressure of the fluid being communicated in a piping system to increase the sealing force created by the sealing device. Fluid being communicated through a ball valve is provided to a sealing device that includes some type of element for creating a bias force. The pressure of the fluid being communicated increases the sealing pressure created by the sealing device. In this manner, the bias force created in the sealing device benefits from the pressure of the fluid being communicated to enhance the sealing when used with a ball valve or similar component.

Abstract: A valve including a flow control assembly having an adaptive, floating closure member is provided. In one embodiment, a ball valve includes a floating closure member having a shoulder enclosed within a recess of the valve body. The recess is larger than the shoulder of the closure member and allows axial movement of the closure member with respect to the valve body and along a flow path through the valve. Additional valve systems, devices, and methods are also disclosed.

Abstract: Method, ram block and ram blowout preventer (BOP) for sealing a well. The BOP includes a body having a first chamber extending along a first direction and a second chamber extending along a second direction, substantially perpendicular to the first direction; a ram block configured to move inside the first chamber, the ram block having a packer region and at least one channel that extends all the way through the ram block; a packer configured to be provided in the packer region to seal a tool provided inside the second chamber; and at least one double piston provided through the at least one channel so that a pressure from the well is transmitted to the packer.

Abstract: A disc assembly for a fluid flow control device includes an annular disc member, a disc holder, a relief bore, at least one branch passage, and an annular recess formed in the disc holder. The relief bore is formed in a first side of the disc holder along a central axis of the assembly. The annular recess is formed in the first side of the disc holder and is disposed coaxially with the relief bore for accommodating at least a portion of the annular disc member. The at least one branch passage is formed in the disc holder and provides fluid communication between the relief bore and the annular recess such that during use pressurized fluid that accumulates in the annular recess between the disc member and the disc holder can be relieved through the relief bore via the branch passage.

Abstract: A control structure of a wall-mounted faucet includes a water outlet and a control device, wherein the control device has a control stick, a valve block, a sealing unit and a resilient unit, wherein the control stick is disposed through a through hole of the water outlet, and the valve block has two clamping ribs protrudingly located at front side of the valve block, and the clamping ribs clamp the control stick. A connecting surface is located on top of the clamping ribs, and the resilient unit covers the control stick, wherein both ends of the resilient unit are against the stopping surface of the water outlet and the connecting surface of the valve block. So, the control stick is pushed by the resilient unit to drive the valve block to escape the valve of the water outlet to avoid the water unexpectedly spraying out from the showerhead.

Abstract: A flow path switching valve arranged to rotate a main valve with an auxiliary valve to switch a cooling state and a heating state, which provides a reliable operation of the main valve by simplifying the rotation movement of the auxiliary valve and the main valve and provides reduced switching time. An outdoor heat exchanger-side pressure equalizing hole and an indoor heat exchanger-side pressure equalizing hole are formed at the main valve. An occluding portion for opening and closing of the pressure equalizing holes is formed at the auxiliary valve. The main valve is rotated 90 degrees by merely operating the auxiliary valve along one direction in forward or reverse direction to switch between the cooling state and the heating state.

Abstract: An up and down operating actuator unit which manages upward and downward motions of an opening and closing member, and a forward and backward actuator unit which manages forward and backward motions of the opening and closing member are configured so that the opening and closing member, which opens and closes a wafer movement path, can be accurately operated in an “L”-shaped motion.

Abstract: A blow out preventer (10) includes a housing (40) defining a longitudinal throughbore (16) and a ram cavity (34) and at least one pair of opposed rams (12, 14) located in the ram cavity. Each ram includes a seal (18, 24) disposed on an upper surface (20, 26) and the rams are movable transversely across the bore. The blow out preventer further includes at least one seal seat (30) having a seal surface (36) for engaging with the ram seals. There is a seal seat associated with each at least one pair of rams, the seal seat being moveably mounted in the ram cavity. In one embodiment the seal seat continuously engages the rams as the rams move from a cavity open position to a cavity closed position.

Abstract: A method of operating a rotary valve using a variable dome seating pressure to provide a minimum seating force for each position of the valve is described.

Abstract: In a liquid drip prevention valve, an input port is formed in the upper face of a flow passage block, and an output port is formed in the lower face, which opposes the upper face of the flow passage block. In addition, a valve chamber is formed on a side face of the flow passage block, and an air block abuts the side face. Furthermore, a diaphragm valve makes contact with a valve seat when pressure is applied with respect to a back side chamber of the diaphragm valve and separates from the valve seat when the back side chamber is brought to negative pressure, thus forming the liquid drip prevention valve.