Abstract: Drill string flow control valves and more particularly, drill string flow control valves for prevention of u-tubing of fluid flow in drill strings are provided. Drill string flow control valves may comprise a valve housing, a valve sleeve axially movable within a valve housing from a closed position to an open position, a piston axially movable within said valve housing and bearing against the valve sleeve, a biasing mechanism for biasing the valve sleeve into the closed position, a static pressure port for actuating said piston utilizing internal fluid pressure within said valve and a plurality of dynamic pressure ports for allowing a differential pressure to be exerted on the valve sleeve during dynamic flow conditions. The differential pressure exerted on the valve sleeve may be the result of an upstream pressure and a downstream pressure during fluid flow through said valve.

Abstract: The device comprises a body (3) defining a chamber (21 A, 21 B) sliding inside which is a control piston (5), which divides said chamber into a first half-chamber (21 B) and a second half-chamber (21A). A duct (33; 37) to feed a control fluid leads into each half-chamber; the first half-chamber has an opening (11), closable with a closing element (13), which is constrained to the body (3) by constraining means comprising: a first substantially annular seat (25), provided in a wall surrounding said opening (11); a second substantially annular seat (27) provided in the closing element (13); a filiform element (23) forming a blocking member of the closing element, and housed in a space defined by the two substantially annular seats.

Abstract: A control system for a downhole tool, such as a subsurface safety valve, features an operating piston that is insensitive to tubing pressure in the valve. The hydrostatic forces from the single control line from the surface are significantly reduced with a branch line to a piston bottom that is slightly smaller than the piston top. A variable volume between piston seals is connected to a low pressure compressible fluid reservoir to permit piston movement. The piston can be modular to facilitate assembly or bore offsets in the valve body. Failsafe closure upon seal failures is contemplated.

Abstract: A piston and valve stem assembly is held in either a gate open or gate closed position by a valve gate piston retention device until such time as sufficient air pressure is built up behind the piston, upon which the valve gate piston retention device is signaled to release the piston. The piston, being pre-charged, is thereby able to overcome both static and dynamic friction thus allowing it to move freely and immediately, and in the case of multiple pistons, simultaneously or sequentially, and without hesitation. Both simultaneous or sequential retention and release of the piston via mechanical or electromagnetic means can be controlled to actuate a plurality of pistons forward or back in an expeditious manner to overcome pneumatic losses and frictional forces in an effort to achieve more precise timing of the valve stem and optimize overall cycle time.

Abstract: The two-port valve comprises a main valve part which includes a valve seat disposed in the flow path, a valve element for opening and closing the flow path, and a rod coupled with the valve element and inserted into a through hole of a bonnet, and an operation part for driving the rod. The protection structure is provided in the two-port valve for protecting the rod seal member for the through hole from the fluid containing a depositional material. The protection structure includes ring-shaped abutting seal surfaces disposed in a wide area between a peripheral part of the valve element and an outer periphery of the rod for preventing the invasion of the fluid in a state of opening the valve. A ring-shaped elastic seal member is disposed on an inner end of the abutting seal surface.

Abstract: A volume flow regulating valve for a hydraulic system for controlling a belt-driven conical-pulley transmission. The valve includes a control piston with a pressure surface and an oppositely facing pressure return surface. A supply segment is associated with the pressure surface, and a cooler return segment is connectable with the supply segment by a control edge of the control piston. A pressure return segment is associated with the pressure return surface, and a pressurizing segment is situated between the cooler return segment and the pressure return segment.

Abstract: Commonly blow-off valves are very expensive devices due to the high reliability requirements and the necessity of a high volume flow rate to obtain an immediate drop of pressure in the system. In order to reduce costs and obtain a simple and reliable system, it is proposed to use an actuation vessel with a piston within, which is connected rigidly to the free piston and to operate the piston by applying the system pressure on one site of the piston to keep the Blow-off-valve closed and to open the blow-off-valve by connecting the vessel with a lower pressure, preferably atmospheric pressure.

Abstract: Cartridge-style fluid control devices are provided that are static pressure independent and capable of repeatable, reliable, particulate insensitive performance in service conditions typical of downhole intervention environments.

Abstract: The dual actuator valve of the present invention deploys both the primary and secondary actuator elements in a single, common control chamber. Therefore, the present invention provides a dual actuator valve having dimensions that are the same as, or similar to, the dimensions of a single actuator control valve. It will be appreciated that the actuator elements may be of diaphragm type or piston type actuator elements. The primary actuator element is mechanically linked to the valve plug and regulates the flow though the valve, while the secondary actuator element remains in a fully open position. Should the primary actuator element fail to operate the valve due, for example, to diaphragm rupture, failure of the primary control system, or any other reason, the secondary control system activates the secondary actuator element, which then effects movement of the primary actuator element thereby resuming flow regulation or closure of the valve as necessary.

Abstract: A step ratchet mechanism that allows for the incremental movement of an assembly that may be adapted to incrementally open or close an adjustable orifice. The step ratchet mechanism may be comprised of a modified body lock ring that permits incremental movement along a mandrel in either direction along the mandrel. The step ratchet mechanism may be actuated a designated distance by the application of pressure to the mechanism. The step ratchet mechanism may be ideal for using pressure to drive a downhole multi-position device. The modified body lock ring is adapted to both secure the mechanism at each set position as the mandrel is pumped down as well as allowing the mechanism to ratchet when the mandrel is pumped back.

Abstract: A gate valve including a valve housing defining a valve chamber having an opening therethrough along a flow path, a gate support supported within the valve housing between a closed position in the flow path, an open position outside of the flow path, and a service position extending out of the valve housing, and a dual actuator assembly having a service piston assembly having a service piston reciprocable within the valve housing, and an inner piston assembly having an inner piston reciprocable within the service piston assembly. The gate support is configured to reciprocate with the inner piston between the closed and open positions, and with the service piston between the closed and the service positions. A method of using the gate valve is also disclosed.

Abstract: A rectangular gate valve having an improved driving action is disclosed. The rectangular gate valve of the present invention includes a sealing member, which opens or closes a wafer moving passage, a main shaft, which is coupled to the sealing member and has a guide member, and a housing bracket, which has a first guide slot, into which the guide member is inserted. The gate valve further includes a valve drive unit, which is provided in the housing bracket and has an air cylinder, a piston, a piston shaft, a moving unit and a connection link. The gate valve further includes a guide bracket, which has a vertical bracket, a second guide slot and a horizontal bracket. The gate valve further includes a guide link, which is moved along the second guide slot to guide movement of the main shaft.

Abstract: The present invention relates generally to a fluid level control system comprising a level sensor (10), and a valve in the form of a shut-off valve (12). The level sensor (10) is mounted to a vessel (not shown) and designed to sense the level of fluid, such as fuel, in the vessel. The shut-off valve (12) is designed to be actuated by a dry-break refuelling nozzle (not illustrated). The shut-off valve (12) is operatively coupled to the level sensor (10) via a sampling flow line (14) together with first and second hydraulic return lines (16) and (18), respectively. The shut-off valve (12) is of a normally-open configuration wherein it permits the flow of fuel from the refuelling nozzle to the vessel whilst the fluid or fuel level is below a predetermined level. The level sensor (10) is configured to effect closure of the shut-off valve (12) when the fuel level is at the predetermined level.

Abstract: The invention relates to the field of the submarine valve actuators, and specifically to those actuators, that in order to effect a standard valve closing operation are connected to an oleo system feeding an hydraulic cylinder (1), whose plunger (3), by a mechanical link, operates the valve and compresses a spring (8) which provides for the standard opening operation. Said actuators are provided with an input shaft (21) for connectin a ROV for valve opening and closing operations when there is a failure in the oleo system. The connection between the ROV-operated input shaft (21) and the mechanical link between the piston (3) and the spring (8) is carried out by a planetary gear reducer (15).

Abstract: A oneway valve for an automatically inflatable air cushion includes a valve body having an air inlet port and an air outlet port, a valve seat mounted in the valve body and formed with a plurality of conducting holes connected to the air inlet port and the air outlet port, and a valve stem movably mounted in the air inlet port and movable to seal the conducting holes. Thus, the oneway valve prevents the air from leaking from the air cushion during the inflation process and prevents the air from entering the air cushion during the deflation process, so that the air cushion is inflated and deflated completely and exactly.

Abstract: An annular mating portion extends from a fastening surface of a fastening nut. The mating portion has an inner diameter set to be substantially equal to an outer diameter of the portion of a piston in which an accommodating groove is formed. In a state in which the mating portion is inserted into the accommodating groove and an inner circumferential surface of the mating portion slides in contact with a circumferential wall of the accommodating groove, the fastening nut is mated with a threaded portion and a lip seal is held between the mating portion and the accommodating groove. This fixes the lip seal to the piston.

Abstract: A valve comprises a valve body and a shutoff assembly. The valve body includes an inlet, an outlet, and a fluid flow passage therebetween. The shutoff assembly includes a poppet and a piston. The poppet is movable between a closed position, a partially open position, and a full open position. The piston is disposed in the valve body adjacent to the poppet, and is moveable between a first position, in which the piston at least inhibits movement of the poppet from the closed position to the full open position, and a second position, in which the piston allows movement of the poppet from the closed position to the full open position.

Abstract: A closing body (3) which is mounted in a housing (2) in such a way that it can be axially displaced and can be pressed out of an opening position against a valve seat (4) into a closing position. The closing body (3) is rotationally symmetrical and includes, on its outer diameter (D1) in relation to its cross-section, two outer wall sections (5, 5?) which meet at an angle of less than 180°. In this way, a surrounding interference edge (26) is formed, favouring turbulence in the flow and thus a rapid increase in the dynamic pressure. When the closing body is embodied as a hollow body, a spring action also occurs, damping the closing movement.

Abstract: A pressure release encoding system for communicating downhole information through a wellbore to a surface location has a valve for providing a fluid restriction to fluid passing in the wellbore, a sensor positioned in the wellbore for sensing a downhole condition in the wellbore, an actuator cooperative with the valve for moving the valve between at least two positions in timed relation to the downhole condition sensed by the sensor, and a detector positioned at the surface location for providing a measurement value at the surface location correlative to the time between the changes of the pressure of the fluid in the wellbore. The sensor is an inclination sensor for sensing an angle of inclination of a drill bit in the wellbore.

Abstract: An apparatus is provided for a valve actuator assembly comprising an actuator housing, a piston, and a spring. The piston is disposed within the actuator housing. The piston is configured to couple to a valve element, and includes an inner cylindrical section and an outer cylindrical section. The outer cylindrical section of the piston is spaced apart from the inner cylindrical section to define a recess. The piston is further configured to move within the actuator housing in a first direction and a second direction, to thereby move the valve element toward a first position and a second position, respectively. The spring is disposed within the actuator housing, and is configured to supply a bias force that urges the piston to move in the first direction. The spring is at least partially disposed within the recess, and at least partially surrounding the inner cylindrical section.

Abstract: The invention relates to a vacuum valve drive (1) for linear displacement of a valve closure (2) along an adjustment axis (3) between an opened position (A) of the vacuum valve (4) and a position (B) in which it is closed gas-tight, and to a vacuum valve (4) comprising the vacuum valve drive (1). The vacuum valve drive (1) comprises a drive housing (5) which contains a gas-tight working space (6), a piston (7) inside the working space (6), which divides the working space (6) into a first and a second pressure space (6a, 6b), and at least one connecting rod (8; 9) which is led from the working space (6) in a gas-tight manner to the valve closure (2). According to the invention, a static guide rod (11) which extends centrally and parallel to the adjustment axis (3) inside the working space (6) and is led through the piston (7), and a precision linear bearing (12) between the piston (7) and the guide rod (11), are provided.

Abstract: The present invention (with reference to FIG.

Abstract: The present invention is directed to rotary valve assemblies and, more particularly, to a rotary valve assembly for use in an oil and gas production system. The valve assembly comprises a movable actuator sleeve movable in response to hydraulic pressure and at least one seat, the at least one seat having at least one fluid channel capable of providing fluid flow therethrough. The valve assembly also comprises a rotating disk disposed between the at least one seat and a support bushing, the rotating disk capable of rotating in response to movement of the movable actuator sleeve, the rotating disk having an open position and a closed position, wherein the open position permits fluid flow through the at least one fluid channel of the at least one seat and the closed position stops fluid flow through the at least one fluid channel of the at least one seat.

Abstract: A system for draining fuel from the combustion chamber of a gas turbine engine in the event of a false start includes associated passageways and a straight through flow pilot air actuated poppet valve. The valve is normally open and actuated by the pilot air to close off the combustion chamber from the drain. A return spring biases the valve to open upon release of pilot air pressure acting on the valve. The valve housing has a piston section with a pilot air chamber and a section defining the passageways for the drain. The drain passageway extends along a straight path at an oblique angle to a piston axis along which a piston actuator moves in response to the return spring and/or the pilot air pressure. The valve also includes a position feedback system for detecting the state of the valve.

Abstract: A coating material dispensing device includes a first component providing a connection to a source of coating material to be dispensed and a filter for filtering coating material to be dispensed. The first component includes a housing for housing the filter and a closure for selectively closing the housing to permit removal and replacement of the filter. The coating material dispensing device further includes a second component providing a nozzle through which the coating material is dispensed. The first and second components include first and second passageways, respectively. The first and second passageways communicate when the first and second components are assembled together to provide a flow of filtered coating material from the filter to the nozzle.

Abstract: Methods and systems for retaining hydraulic fluid in a hydraulic valve actuation system adapted to be installed on an internal combustion engine are disclosed. The system may include a hydraulic fluid supply connected by one or more passages to a fluid accumulator and a hydraulic valve actuator. The one or more passages may include a retaining portion elevated above portions of the fluid accumulator and/or the hydraulic valve actuator. The retaining portion may include an air vent and thus prevent back flow of all the fluid in the accumulator and/or hydraulic valve actuator to the fluid supply during periods that the engine is shut off. Retention of hydraulic fluid in the system may be further enhanced during engine shut off by selectively controlling the release of hydraulic fluid from the hydraulic valve actuator during the engine shut off process.

Abstract: A valve for controlling a flow of abrasive particles suspended in a pressurized carrier fluid has at least two apertured valve seats (74, 75) in face to face contact. One of the valve seats (74, 75) may be slid between a first position in which the apertures of each valve seat (74, 75) are aligned to allow fluid flow and a second position in which the aperture is one valve seat (74, 75) is blocked by the face of another (75, 74) to stop flow through the valve. The valve seats (74, 75) each have an outer layer of material with a hardness on the Mohs scale of at least 9, such as diamond. The valve is suitable for use in a fluid jet machining apparatus, particularly apparatus charged with a suspension of abrasive particles such as garnet in water.

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 pressure compensated shear seal solenoid valve for use in subsea control systems is disclosed utilizing an arcuate cross section fluid passageway to improve flow rates, ease of serviceability and reduce size.

Abstract: This invention relates to an improved air operated fluid control valve which tends to inhibit or impede the travel of a fluid to the air controlled side of the control valve. The air operated fluid control valve includes a control valve having a valve body provided with at least one fluid inlet port and at least one fluid outlet port, at least one air inlet port and at least one air outlet port, and a piston assembly selectively controlled by the air inlet and outlet ports so as to regulate the flow of a fluid through the valve body from the at least one fluid inlet port to the at least one fluid outlet port. According to one preferred embodiment of this invention, the control valve includes at least one shield member carried by piston assembly which is operative to inhibit the travel of a fluid from a fluid side of the control valve into an air controlled side of the control valve.

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: An actuator assembly and method for making and using an actuator assembly. In one embodiment, the assembly includes an actuator body having an actuator channel with a first region and a second region. An actuator is disposed in the actuator channel and is movable when in a flowable state between a first position and a second position. A heater is positioned proximate to the actuator channel to heat the actuator from a solid state to a flowable state. A source of gas or other propellant is positioned proximate to the actuator channel to drive the actuator from the first position to the second position. The actuator has a higher surface tension when engaged with the second region of the channel than when engaged with the first region. Accordingly, the actuator can halt upon reaching the second region of the channel due to the increased surface tension between the actuator and the second region of the channel.

Abstract: A closure device for a vacuum closure of at least one opening in a wall having a valve place, at least one piston-cylinder unit, at least one carrier unit, at least one cylinder bore hole, at least two sealing rings, and a line. The valve plate is associated with an opening and is displaceable between an open position in which it releases the opening, a position in which it covers the opening but is raised from the wall and a closed position in which it covers the opening and contacts the wall. The at least one piston-cylinder unit serves to displace the valve to the different positions and includes a pneumatically actuated piston. At least one carrier unit is connected to a piston rod which serves to displace the valve to the different positions.

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: An inlet system for an inlet in a flow field includes an inlet recess housing having an interior with forward and rear end walls, a base wall, and an opening formed in an upper surface thereof. An intake duct is formed in a rear end wall of the inlet recess. An inlet door has a first end pivotally connected to a forward wall and a trailing edge directed to the rear end wall of the inlet housing such that the inlet door selectively closes the opening of the inlet housing. An overlap member can extend from the rear end wall of the inlet recess to a predetermined distance adjacent a trailing edge of the door. A deflector is provided having an end deflecting portion in contact with the trailing edge of the door over at least a portion of the inlet door's pivoting path. Side deflecting portions project from the end deflecting portion toward the front wall of the inlet housing.

Abstract: A lost motion assembly for a valve of an internal combustion engine includes a cam, a cam piston which is spring biased to follow motion of the cam, a valve piston operatively engaged with a poppet valve, and an auxiliary piston. The cam piston, valve piston and auxiliary piston are in continuous contact with a fluid in an enclosed control chamber having a fixed volume, such that rotation of the cam causes displacement of the cam piston into the control chamber, which causes a corresponding displacement of at least one of the valve piston and auxiliary piston while the volume of fluid in the control chamber remains substantially constant.

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: A valve is formed to resist snap-action closure forces and provides a smooth closing action to minimize or eliminate water hammer. The valve is opened and closed by modulating the relative air pressures above and below a piston in the valve. Because the air pressures above and below the piston produce partially offsetting forces on the piston, the net closure force on the valve plunger is limited, and the rate of valve closure is reduced enough to achieve the effect of minimizing water hammer. A separate vent port volume may vent to atmosphere to further limit valve closure speed, and to further reduce water hammer. The valve can provide the capability to control the flow of fluids over a wide temperature range over a long service life while reducing or eliminating water hammer. The valve is well suited for use in injection mold temperature control systems.

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: Disclosed is a flow control valve capable of controlling a flow amount of air, gas or fluid inside a pipe. The flow control valve has a relatively simple structure, which can reduce manufacturing expenses, minimize malfunction and wrong driving, and allow a rapid repair and replacement of components.

Abstract: A method enables a gas turbine engine to be operated. The method includes directing fluid flow from a source into an inlet of a valve, channeling the fluid flow entering an inlet portion of the valve towards an outlet portion of the valve such that a direction of the fluid flow is changed within the inlet portion, and controlling the amount of fluid flow entering the outlet portion of the valve by selectively positioning a valve disk coupled within the inlet portion of the valve by a valve disk axle. The method also comprises channeling the fluid flow from the inlet portion of the valve through the outlet portion of the valve and into a fluid supply pipe, wherein the valve outlet portion has a substantially right cylindrical shape such that a direction of fluid entering the body outlet portion remains substantially constant therethrough.

Abstract: The invention is therefore directed to a rotary valve actuating system coupled to a pipeline for a pressurized fluid, the actuating system being coupled to the rotary valve to selectively cause operation of the valve. The valve actuating system comprises at least two reservoirs having an amount of an operating liquid in a first portion being coupled to an external source of pressurized fluid in a second portion thereof. A slideable piston is positioned within each of the reservoirs to isolate the first and second portions, and upon application of pressure from the external pressurized fluid against the slideable piston, operating liquid is supplied to actuate the rotary valve. In this manner, the operating liquid is isolated from the external source of pressurized fluid, such as supplied from the pipeline.

Abstract: A pinch valve of the invention comprising an elastic tube body 1, a cylinder body 4 having a cylinder portion 2 and a cylinder cover 3, a piston 11 sliding on the inner periphery of the cylinder body, a pressing piece 15 fixed to a connecting portion 13 suspended from the piston, a body 16 joined to the cylinder body and having a groove 17 receiving the tube body 1, a pair of connecting body carriers 20 engaged with grooves of the body and having a through-hole 26 receiving the tube body 1, a first and a second space portions 8, 7 formed above and under the piston 11, respectively, and a pair of air ports 10, 9 respectively communicating with the first and second space portions 8, 7. The whole pinch valve is made compact in construction.

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: 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 said slide valve plate being 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), 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 provided, 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 safety valve has a lock open feature that is actuated by expanding or penetrating the flow tube to disconnect the link between the piston in the hydraulic control system and the flow tube. In normal operation, downward movement of the piston moves the flow tube against a power spring. When the flow tube is expanded, penetrated, or otherwise altered, the piston no longer acts on the flow tube and the flow tube can be simply pushed down and locked in position with the flapper wide open.

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 valve for controlling fluids has a piezoelectric unit (3) for actuating a valve member (2) that is displaceable in a bore (8) of a valve body (9), having at least one control piston (7) and at least one actuating piston (10) for actuating a valve closing member (9). Between the control piston (7) and the actuating piston (10), a hydraulic chamber (11) functioning as a hydraulic coupler is embodied; the actuating piston (10), defining the hydraulic chamber (11), is supported displaceably in a blind bore (12) of the control piston (7), which bore is open in the valve seat direction. A cross-sectional area (A0), bordering the hydraulic chamber (11), of the control piston (7) on the one hand and a smaller cross-sectional area (A1) of the actuating piston (10) and a cross-sectional area (A2) of at least one reducing element (14) determine a boost for the stroke length of the actuating piston (10), during which the at least one reducing element (14) is braced on a stop (15) in the bore (8) (Drawing figure).

Abstract: A valve for controlling a flow of pressurized abrasive particles to a machine includes a valve body that defines a particle chamber having an inlet port and an exit orifice. A tapered valve seat surrounds the exit orifice. A shaft having a nose piece is positioned within the particle chamber. The shaft is movable between a closed position, where the nose piece engages the valve seat so that particles cannot pass through the exit orifice, and an open position, where particles are free to flow out of the exit orifice. A flexible barrier surrounds the shaft and separates the particle chamber from the actuating mechanism to prevent abrasive particles from damaging the actuating mechanism. A clean chamber is positioned between the shaft actuating mechanism and the barrier and is pressurized to a pressure generally equal to that of the particle chamber to prevent damage to the barrier.

Abstract: A passive valve assembly for controlling the flow into or out of chamber (3) through a port (4). The valve assembly comprises a valve element (5) arranged to open in the direction of flow through the port. The valve element (5) has a piston (9) which is reciprocable in a cylinder (10) containing gas. On opening of the valve, gas is compressed in a first chamber (11) of the cylinder (10), and this energy of compression is used to reverse the direction of the valve element (5) and return it to its seat.