Abstract: A vaporizer can efficiently vaporize a liquid material under a depressurized atmosphere. The liquid material is temporarily stored in a liquid storing chamber, and is supplied to a vaporizing chamber set in the depressurized atmosphere via a small aperture. An inlet of the liquid storing chamber is opened or closed by a valve body, which is moved by an actuator controlling a degree of opening of the valve body.

Abstract: An improved method and apparatus for a valve assembly features a valve body, a first seat ring mounted in the valve body, a second seat ring mounted in the valve body, and a retractable blade gate slideable in between the first seat ring and the second seat ring. The gate is moveable between open and closed position. A first elastomeric ring is disposed in between the valve body and the first seal ring and projecting towards the gate blade. A second elastomeric ring is disposed in between the second seat ring and the valve body and projecting towards the gate blade.

Abstract: A controlled rate feeder system for fine particle solids and a method thereof includes a seat-and-backseat structure, a seat plate assembly, a backseat plate assembly, at least one biasing device, and an actuator assembly. The seat-and-backseat structure has an inlet and an outlet which are connected together by at least one passage. The seat plate assembly is moveable to any position between covering and exposing the inlet. The backseat plate assembly is positioned adjacent to and moveable with the seat plate assembly. At least one biasing device is positioned between the seat plate assembly and the backseat plate assembly which biases the seat plate assembly and the backseat assembly apart. The biasing device also biases the seat plate assembly against an inner surface of the seat-and-backseat structure and the backseat plate assembly against another inner surface of the seat-and-backseat structure. The actuator assembly moves the seat plate assembly to any position between covering and exposing the inlet.

Abstract: A valve plate (54) is slidably moved on a frame (52) by an actuator (62) between open and closed positions to control the supply of air sucked into the inlet (44) of a blower system (40) that supplies pressurized air through an outlet (46) to a plenum (12) for distribution to said nozzle (16, 18). By disposing the valve plate (54) at the inlet, the blower motor (49) may run continuously without a load as the impeller is not pumping air when there is no demand to blow the water from a vehicle.

Abstract: A gate valve has a body, the body having a cavity and a flow passage intersecting the cavity. A seat ring is mounted to the body at the intersection of the flow passage and the cavity, the seat ring having an engaging face. A gate in the cavity has an engaging face that slidingly engages the face of the seat ring while being moved between open and closed positions. A polymer coating is on at least one of the faces. The polymer contains a quantity of carbon nanotubes for stiffening.

Abstract: The present invention is directed to a pressure balanced fluid control device. In one illustrative embodiment, the device comprises a body, a bonnet coupled to the body, a valve stem operatively coupled to a gate positioned in the body, a valve stem seal positioned between the valve stem and the bonnet, wherein a sealed cavity exists above the valve stem seal, and an opening through the bonnet that is adapted to allow a pressure of a working fluid flowing through the valve to be exerted in the sealed cavity above the valve stem seal. In another illustrative embodiment, the device comprises a body, a bonnet coupled to the body, a valve stem operatively coupled to a gate positioned in the body, a valve stem seal positioned between the valve stem and the bonnet, wherein a sealed cavity exists above the valve stem seal, and an opening through the bonnet, the opening being in fluid communication with the sealed cavity and an interior region of the body.

Abstract: A vacuum valve is disclosed. The vacuum valve comprises a body and a cylinder, mounted at the upper end of the body having a cavity including a piston, the center of the piston provided a piston rod extended into the cavity and the two sides of the body and the bottom section of the body being air holes, characterized in that the end of the piston rod is connected with a rocking arm and a gate plate having a lug by means of a connection rod, and one side of the gate plate, positioned at the interior of the upper section of the air hole is a pivotal lug by means of a connection rod so that the valve plate is opened or closed at an arch angle at the air hole, and the exterior of the bottom section of the body is a bottom plate so that the vacuum valve is formed into a two-passages valve and is connectable to a 180 degree conduit.

Abstract: A container for storing and dispensing liquids such as gasoline has a gate valve wherein the gate valve comprises a thin, substantially flat slide member optionally angled at a portion thereof. The gate valve member is slidably positioned within a similarly shaped channel formed into a surface of a reservoir (storage) portion of the container, or other area of the container.

Abstract: The invention provides a vacuum gate valve for closing off an opening. The vacuum gate valve can have a valve plate that can be turned so that the alignment of the valve plate will adapt to a valve seat when the valve plate is pressed against the valve seat.

Abstract: A device for metering and controlling fluid flow includes a variable orifice and is configured to use a pressure sensor. The device includes a fluid flow conduit having at least one planar inner wall that extends along a portion of the fluid flow conduit length, and an element having a linear edge configured to mate with the at least one planar inner wall of the fluid flow conduit. The element is movable in a direction transverse to an axis of the conduit between an open position wherein fluid flows through the conduit and a closed position wherein the element substantially shuts off fluid flow in the conduit.

Abstract: A dual chamber orifice fitting, including a body with a lower chamber in fluid communication with a pipeline and a top with an upper chamber in fluid communication with the lower chamber. A valve assembly closes to hydraulically isolate the upper chamber from the lower chamber and opens to allow an orifice plate carrier to move between the chambers. When the orifice plate carrier is in the lower chamber is can be aligned with the flowbore of the pipeline. The orifice plate carrier can be removed from the fitting through the upper chamber. In the preferred embodiments, at least one of either the upper or lower chambers has a non-rectangular cross-section. The body and top may also have a curved outer surface to accommodate the non-rectangular cross-section of the interior chambers.

Abstract: A pipe fitting with a body adapted for connection at a first end thereof to a supply pipe and at a second end thereof to a distribution pipe so as to permit fluid communication between the supply pipe and the distribution pipe. The body is provided with first valve device by which said fluid communication can be interrupted. The body is provided with an upstream port and a downstream port, respectively upstream and downstream, in use, of the first valve device. The upstream port and said downstream port permitting the first valve device to be by-passed and fluid from the supply pipe to be introduced to the distribution pipe.

Abstract: A valve override system for allowing a user to restore flow through a gate valve that has failed in the closed position. The valve override system includes an engagement assembly being designed for engaging a gate of the gate valve assembly whereby the engagement assembly is for urging the gate of the gate valve assembly into an open position to allow fluid to pass through the gate valve assembly.

Abstract: A sliding gate valve, a sealing gasket for the valve, and a method of assembling the valve that may be used to govern the flow of a fluid such as a liquid or a gas. The sealing gasket may be characterized as having a circular portion, two connector portions, and a substantially curved portion that provides a seal discouraging fluid loss during use of the valve. Example fluids suitable for use with the valve include water, air, or oxygen. The fluids may or may not be pressurized as the valve provides a seal against leakage that is not dependent upon a pressure differential. Typical installations for the valve include, but are not limited to, household water supply systems, laboratory environments, and industrial settings.

Abstract: A shut-off device (1) for protection against explosions in a pipe-line is fitted with a slide valve plate (10) movable transversely to the direction of flow (A). The slide valve plate is connected via a piston rod (25, 26) to a piston (27, 28) slidably guided in a cylinder (35, 36) and actuated by a pressure medium. The pressure medium is supplied from a pressure medium reservoir via a closing valve (45) to a working chamber (46, 47) of the cylinder (35, 36), thereby actuating the piston and causing the slide valve plate (10) to move into a position closing the pipe passage (4). At least one cylinder (35, 36) is arranged within a pressure chamber (40) enclosed by a housing (30), which forms the pressure medium reservoir. Thus, a compact, space-saving shut-off device is created which can be shut within a very short time.

Abstract: A gate valve for controlling the flow of fluid through a component having a fluid flow passage that includes at least a first branch and a second branch, the gate valve comprising a gate cavity which communicates with both the first branch and the second branch; a gate which is movably positioned in the gate cavity and which includes a first flow port that is connected to a second flow port; and an actuating mechanism for moving the gate between an open position, in which the first flow port is aligned with the first branch and the second flow port is in communication with the second branch, and a closed position, in which the first flow port is offset from the first branch; wherein the second flow port is divergent from the first flow port; whereby when the gate is in the open position, the direction of the flow of fluid through the gate valve is changed by the first and second flow ports.

Abstract: A gate valve apparatus minimizes the chance that radicals and plasma in exhaust gas will contact a main valve seal, thereby preventing deterioration of the main valve seal. Slats of a flow control device are installed in an exhaust flow path to control the pressure in a process chamber. The main valve seal is provided on an abutting surface of a main valve element. An annular projection is provided on a pump-side inner wall surface of an accommodating chamber. When it is in a non-sealing position, the main valve element is moved toward the pump-side inner wall surface of the accommodating chamber to bring an outer peripheral portion of the main valve element into contact with the annular projection. Thus, the main valve seal is shielded from radicals and plasma in exhaust gas by the main valve element, the annular projection and the pump-side inner wall surface of the accommodating chamber.

Abstract: An apparatus for locking a valve having a valve member movable between an open position and a closed position. The apparatus includes an actuator assembly, a locking base, a locking shaft, and a locking pin. The actuator assembly moves the valve member between the open position and the closed position. The locking base has a through-bore extending from the lower portion to an upper portion, a first thread provided on the upper portion, and a first locking bore extending transversely therethrough. The locking shaft reciprocally extends through the through-bore of the locking base and includes an upper end having a second thread that is selectively engagable with the first thread of the locking base when the valve member is in a predetermined position, and a second locking bore extending transversely through the locking shaft.

Abstract: A gate valve apparatus comprising an elastic seal member inserted into a pipe, a pressure member for elastically deforming the elastic seal member under pressure, a drive shaft for moving the pressure member along the direction of insertion, a movable member for keeping the elastic seal member in pressure contact with the inner wall surface of the pipe, and a support member for supporting the elastic seal member. The elastic seal member is elastically deformed and kept in close contact with the inner wall surface of the pipe thereby to gate the flow path in the pipe. The elastic seal member includes a through hole which is formed nearer to the forward end portion along the direction of insertion than the guide hole of the support member and by way of which the forward end portion of the drive shaft can be inserted.

Abstract: A method to set a hollow device into an undersea flow pipe uses a flexible pig driven by a flow flowing into said flow pipe to displace a hollow device to a point where a stop means halts a displacement of said hollow device, thereby setting said hollow device into position. A method to retrieve a hollow device into an undersea flow pipe uses a flexible pig driven by a flow flowing into said flow pipe to retrieve said hollow device from a location where said hollow device operates halted by a stopping means.

Abstract: A closure member for a tubing hanger which is suspended in a tubing spool and which comprises an elongated body having an annulus bore that extends generally longitudinally therethrough, the annulus bore comprising at least a first branch which is in fluid communication with a second branch. The closure member comprises a gate cavity which is in fluid communication with both the first branch and the second branch, a gate which is movably positioned in the gate cavity and which includes a first flow port that is connected to a second flow port, and an actuator for moving the gate between an open position, in which the first flow port is aligned with the first branch and the second flow port is in fluid communication with the second branch, and a closed position, in which the first flow port is offset from the first branch, wherein the actuator is disposed at least partially within a conduit that extends generally axially through the tubing hanger.

Abstract: Regulating slide valve comprising a valve body having a valve opening, and a valve plate which has two side surfaces and which is displaceable along a displacement path between an initial position in which it releases the valve opening and an end position in which it completely covers the valve opening, this displacement path forming the regulating area of the valve; wherein the valve plate has a contact ring on one side surface, which contact ring projects over the side surface of the valve plate and is mounted at or in the valve plate by a spring device, can be pressed in against the spring force of the spring device in the direction of the valve plate and contacts a contact surface of the valve body at least over a portion of its circumference in the end position of the valve plate.

Abstract: A valve assembly for insertion in a pipe containing fluid under pressure includes a valve body adapted to be assembled over the pipe and a valve-stopping mechanism that mounts on the valve body. The hollow valve body interior and an access opening in the valve body are sufficiently large to receive a hole saw element no smaller than the outside diameter of the pipe as installers advance the hole saw element radially through the access opening to form a gap in the pipe. The valve-stopping mechanism includes a gate with a cross sectional area greater than the pipe that mates with the valve body interior so that the gate can be advanced radially through the gap in the pipe into direct fluid-tight contact of the valve body in order to thereby stop the flow of fluid through the pipe.

Abstract: A disc slide conveys pure granules or dusts, and can be mounted between a feed pipeline and a discharge pipeline. The disc slide comprises a casing which includes a valve seat comprising two sealing discs and a shut-off element, which is held movably therein and is in the form of a slide plate, and an actuation element for the slide plate. The valve seat and the slide plate are provided with a surface made from silicon or quartz glass or consist of these materials.

Abstract: The invention is an improved conduit flow controller for selectively controlling the flow of fluid through an elongated conduit. The conduit has an aperture defined by a continuous peripheral edge in the sidewall of the conduit. An elongated housing surrounds the aperture and is sealingly connected to the conduit. A conduit stopper is movably mounted in the housing and is positionable in the conduit. The conduit stopper includes a deformable sealing element having opposed flat sides and an edge engageable with the conduit. A carrier is sealingly connected with the sealing element. A resilient seal is mounted on a carrier and is engageable with the continuous edge. The sealing element is cooperative with the seal to close a portion of the conduit to regulate the flow of fluid along the elongated conduit.

Abstract: An alignment device for maintaining the relative alignment between a gate valve assembly and a valve bonnet positioned over the gate valve assembly wherein the valve bonnet has an interior surface. The alignment device includes a pair of substantially identical components wherein the components are securely connectable to each other when the alignment device is attached to the gate valve assembly. Each one of the components includes a body that has a peripheral portion. The peripheral portion is adjacent to the interior surface of the valve bonnet when the valve bonnet is positioned over the gate valve assembly. The body also has a transverse edge wherein the transverse edge contains an opening that receives a part of the gate valve assembly when the components are connected together.

Abstract: An actuator assembly for a slit valve door is configured to maintain a slit valve in a closed condition notwithstanding a high pressure differential between adjacent chambers that the slit valve isolates from each other. The slit valve door actuator assembly includes an actuator which moves the slit valve door between open and closed positions, and a locking mechanism to keep the slit valve door in a position to seal the slit valve in resistance to high gas pressure against the slit valve door. The locking mechanism may include a hard stop which is selectively movable into position to block retracting movement of the slit valve door.

Abstract: A water control gate assembled from hollow core boards of extruded rigid plastic material with soft plastic material gaskets chemically bonded thereto by molecular cross-linking. Side channel members that receive end portions of the boards are extruded of rigid plastic material with soft plastic gaskets chemically bonded thereto by molecular cross-linking. The gaskets seal against the outer surfaces of the board end portions. The gaskets are molecularly cross-linked with the board or side channel plastic material so that they will not separate therefrom. Cross-linking is achieved by way of coextrusion or by locally reheating surfaces of the board or channel member downstream from their extrusion die to a temperature that promotes molecular cross-linking with a gasket material as the gasket is extruded onto the reheated area.

Abstract: The title flow regulator disclosed is used for regulating the level of water in the fields of an agricultural operation according to seasonal needs by a mechanism for adjusting the outflow of water from the tile line. The regulator includes a housing through which water from the tile line is directed and in which a partition with at least one aperture is positioned. At lease one vertically movable gate is associated each aperture and with a motor, an electric cylinder, and at least one actuator bar such that, upon actuation of the motor, the gate moves either open or close the aperture. If two apertures are included, the regulator can be fully open (both apertures open), fully closed (both apertures closed), or partially open (bottom aperture open, top one closed) to achieve the desired moisture level. Dates on which the gates will be moved can be pre-selected by remote signaling.

Abstract: A microdevice is provided for controlling fluid flow. The microdevice includes a substantially planar contact surface and a plurality of fluid-transporting features associated therewith. Also included is a substrate having a substantially planar contact surface and a fluid-transporting feature associated therewith. The contact surfaces are positioned in slidable and fluid-tight contact to allow for controllable formation of a plurality of different flow paths upon alignment of the substrate fluid-transporting feature with each cover plate fluid-transporting features in succession. Typically, at least one of the cover plate and substrate is comprised of a biofouling resistant polymer, and the flow paths are of different lengths. Optionally, a plurality of fluid-transporting features is associated with the substrate so that flow paths are formed as a result of a different alignment of the fluid-transporting features.

Abstract: A gate valve assembly includes a valve seat and a valve. The valve seat includes a passage opening and a contacting region surrounding the passage opening. The valve includes a groove located on a marginal region of the valve, and a sealing body positioned in the groove. The passage opening is closed by covering the valve over the valve seat, and an upper surface of the sealing body is tightly contacted with the contacting region. Therefore, the valve is prevented from rubbing against the valve seat and producing particles.

Abstract: A lockout valve is provided having a valve body with an inlet conduit, a central chamber and an outlet conduit, to form a continuous passageway. The lockout valve also includes a slide mechanism slidingly disposed in valve slide channel to operatively control fluid flow through the passageway between an open position, an intermediate position and a closed position. The slide mechanism includes a plurality of flow apertures to restrict flow through the passageway. The front side of the slide mechanism includes a detent slot and the back side of the slide mechanism includes a longitudinally extending override slot having an upper portion positioned opposite the detent slot to form a continuous opening, and a lower portion that does not form a continuous opening. The valve further includes a detent mechanism for overriding the intermediate position of the slide mechanism including a detent override lever with a finger member extending from an edge of the detent override lever.

Abstract: The valve 10 includes a valve main body 11 having an opening 11A and forming a space which creates a part of a gas flow path, a first valve member 12, provided in the valve main body, for opening/closing the opening 11A, and a drive mechanism 40 for moving the first valve member 12 between a close position where the opening 11A is closed and an open position where the opening 11A is opened, wherein the drive mechanism 40 has a rod 14 to be reciprocated, an end of the rod 14 extends into the valve main body 11 through a through hole 11B formed in the valve main body 11 to be connected to the first valve member 12, the first valve member 12 is moved between the close position and the open position as the rod 14 is driven reciprocated, and the valve further comprising a sealing mechanism 15, which communicates into the valve main body 11 via the through hole 11B, for isolating the drive mechanism 40 side air-tightly from the valve main body, and a second valve member 17, provided on the rod 14 to move together w

Abstract: A slit valve for a semiconductor processing apparatus, for fluidly sealing a passage connecting two chambers of the apparatus, such as a substrate reaction chamber and a region outside the reaction chamber. The slit valve comprises an actuator plate movable within a slot in one wall of the passage, the actuator plate and the slot oriented generally transverse to the passage. The actuator plate has a first position in which the valve is open, permitting the transfer of a substrate through the passage. The actuator plate also has a second position in which the valve is closed, and in which the actuator plate fluidly seals the passage such that fluid cannot flow through the passage across the actuator plate. A protective cover is configured to prevent debris within the passage (e.g., broken wafers, shards, particulate contaminants, etc.) from flowing into the slot when the actuator plate occupies its second position.

Abstract: In a slide valve closure for the casting of a metal melt a slider plate and a stationary closure part are braced against each other by means of spring units or by other means. There is provided a casing framework attachable to a mould or the like, in which is fixed a detachable casing part on which the spring units are held and in which the stationary closure part and the slider plate can be accommodated. This allows safe operation and simple and rapid mounting and dismounting of the slide valve closure.

Abstract: The electrically operable ceramic valve of a beverage machine comprises at least one inlet (2), at least one outlet (4), and at least one liquid flow channel (8) extending between the inlet and the outlet, for controlling a liquid flow from the inlet to the outlet. The ceramic valve further comprises a first ceramic subhousing (16) and a second ceramic subhousing (18) through which the liquid flow channel extends and which are designed to be displaceable along each other by means of an electric drive. The liquid flow channel comprises a bend (8) extending at least for a part in the second subhousing, while in an opened condition of the valve the liquid flow channel, upstream of the second subhousing and downstream of the second subhousing, extends in at least the first subhousing. The second subhousing is displaced along the first subhousing by means of the electric drive for controlling the magnitude of the liquid flow.

Abstract: A ported slide gate valve having a gate for regulating the flow of a fluid through the valve, a seat located in the valve interior, and a means for causing the gate to move in such a manner that the gate fractures any scale built up in the lower portion of the valve interior, prior to the gate's movement to a valve closed position. The scale is fractured in a direction away from the seat and deposited in the fluid. More particularly, the means for causing the gate to move includes a primary piston and a secondary piston, where the primary piston is coupled to the gate. In the valve closed position, the secondary piston holds the primary piston in the desired position. A movement of the secondary piston causes the gate to move to fracture the scale in the lower portion of the valve interior.

Abstract: A choke or kill line connector for a subsea blowout preventer stack which is slide member operated to provide pressure balanced design to eliminate the potentially high forces associated with connectors which do not have the complication of a locking connector and provide integral valving capability to allow for testing and to retain drilling mud in the choke or kill lines upon disconnection.

Abstract: A rapidly actuating gate valve having function of a ball valve is disclosed. A rack extends from a gate. An axial control rod passes through the screw hole of the gate body and then passes through an axial hole. Then the gear of the axial control rod is exactly engaged to the rack of the gate. Retaining threads of a retaining bush around the axial control rod passes through a water-stop ring so as to be locked to the axial control rod to a screw hole of the gate body. Thereby, the axial control rod can drive the gear to rotate; and meanwhile, the rack is driven so that the gate moves upwards or downwards. Thus, the opening of the gate is controlled rapidly to control the volume of the flow. Other than the effect of the original gate, it has a function of a ball valve.

Abstract: A valve arrangement includes a valve housing that defines a product passageway and a valve seat within the product passageway. A valve wedge is disposed within the housing passageway, and moves along a direction of operation between a closed position and an open position. A pair of opposed wings are carried on the valve wedge, adjacent a guide track. Rollers are carried on the wings for rolling engagement with the tracks and scraper blades are carried on the wings adjacent the rollers to scrape contamination from tracks.

Abstract: A gate valve apparatus comprising an elastic seal member inserted into a pipe, a pressure member for elastically deforming the elastic seal member under pressure, a drive shaft for moving the pressure member along the direction of insertion, a movable member for keeping the elastic seal member in pressure contact with the inner wall surface of the pipe, and a support member for supporting the elastic seal member. The elastic seal member is elastically deformed and kept in close contact with the inner wall surface of the pipe thereby to gate the flow path in the pipe. The elastic seal member includes a through hole which is formed nearer to the forward end portion along the direction of insertion than the guide hole of the support member and by way of which the forward end portion of the drive shaft can be inserted.

Abstract: A method and device for pressure testing a pipe line is provided wherein a fitting is inserted into the pipeline by inserting male ends of the pipeline into female ends of the fitting to define a flow path through the fitting extending along a longitudinal axis. The fitting has an internal boss extending around a circumference of the flow path and extending radially inward toward the centerline a distance corresponding to the wall thickness of the mating male ends of the pipes so the pipes and boss define a periphery of the flow path through the fitting. A recess is formed in the boss to sequentially receive two slides. An externally accessible port allows a test slide to be inserted into the recess, with the test slide sealing against the walls defining the recess to form a fluid-tight seal for pressure testing the line. The test slide is removed and a finish slide is inserted into the recess.

Abstract: A globe valve, with a valve chamber 1 which has a flow line that may be shut off by a plug actuatable by an axially adjustable valve spindle, wherein the plug in the shutoff position rests forming a seal against a valve seat oriented obliquely to the direction of flow, characterized in that the nominal width and face-to-face dimension of the valve chamber match the dimensions defined by the standards for valves and fittings of the sandwich design.

Abstract: The invention relates to valves and particularly, though not exclusively, to gate valves. There is provided a valve comprising a housing (1) and a valve member (2) moveable within the housing (1) to open and close the valve. In a first aspect the valve is provided with means (7, 8) to reduce friction between the housing (1) and valve member (2). In a second aspect the valve is provided with an operating member (20) which is associated with the valve member (2) and passes through an aperture (21) in the housing (1) which is sealed when the valve is in the open position. Such a valve addresses difficulties relating to the operation of prior art valves, particularly gate valves, and specifically the difficulties created by frictional drag upon movement of the valve member, and difficulties in maintaining the valve.

Abstract: A choke or kill line connector for a subsea blowout preventer stack which is slide member operated to provide pressure balanced design to eliminate the potentially high forces associated with connectors which do not have the complication of a locking connector and provide integral valving capability to allow for testing and to retain drilling mud in the choke or kill lines upon disconnection.

Abstract: A gate valve unit is provided for controlling the flow of a fluid through a conduit. The gate valve unit includes a valve body including a conduit connector member or flange. A valve face block affixed to the valve body includes first and second backwardly sloped surfaces. A pair of movable gate leaves are disposed on the first and second surfaces of the face block and are movable away from and toward a central passage through the unit for controlling fluid flow through the unit. A face seal provides a seal between the surfaces of the face block and the gate leaves. A visor seal is attached to the valve body which is movable between an operative position in which the visor seal provides sealing between the gate leaves, and an inoperable position away from the gate leaves so as to not interfere with the operation of the gate leaves.

Abstract: A gate valve comprises a body member having a bore therethrough, a gate member movable transversely of the bore between an open position permitting full flow through the bore, and a closed position preventing flow through the bore, and a stem portion mounted in the body member to be axially fixed therein but rotatable relative thereto, one end of the stem portion co-operating with the gate member whereby rotation of the stem portion results in movement of the gate member between its open and closed positions, a sleeve member secured to, to be rotatable with, the stem portion external of the body member and defining an annular gap between the stem portion and the sleeve member, and an annular skirt within said gap, the skirt being rotatably fixed but axially movable relative to the stem portion, the skirt and sleeve member threadedly engaging one another such that rotation of the sleeve member results in axial movement of the skirt relative to the sleeve member and the stem portion in a direction dependent upo

Abstract: A fail-safe gate valve for sub-sea use features a floating, pressure biased compensating piston whose movement prevents internal pressure buildup from opening movement of the gate. A pre-charged fluid chamber provides the bias on the balancing piston. Using unequal piston diameters reduces the charge pressure. The balancing piston is not connected to the gate so that internal pressures can be employed to act on a net area, which biases the gate toward its fail-safe position.

Abstract: A valve system and method is disclosed that includes, in one preferred embodiment, a compact valve system that may be configured in many different ways so as to be especially suitable for conforming to the dimensional requirements of many particular subsea installations such as lower riser packages. Thus, the height of the hydraulic actuator and/or manual override operators can be varied depending on the necessary configuration. However, operation of the manual override operators is the same as previously utilized subsea manual override operators. In one presently preferred embodiment, a hydraulic actuator which may be a fail-safe actuator, is connected to a gate valve utilizing an operating stem which extends through a first bonnet secured to one side of a gate valve body. A moveable gate is attached to the operating stem and is therefore operably connected for control by the hydraulic actuator. On an opposite side of the gate valve body, a second bonnet is secured.

Abstract: In general, the invention relates to a ported slide gate valve having a gate for regulating the flow of a fluid through the valve, a seat located in the valve interior, and a means for causing the gate to move in such a manner that the gate fractures any scale built up in the lower portion of the valve interior, prior to the gate's movement to a valve closed position. The scale is fractured in a direction away from the seat and deposited in the fluid. More particularly, the means for causing the gate to move includes a primary piston and a secondary piston, where the primary piston is coupled to the gate. In the valve closed position, the secondary piston holds the primary piston in the desired position. A movement of the secondary piston causes the gate to move to fracture the scale in the lower portion of the valve interior.