Abstract: Disclosed is a surface controlled subsurface safety valve for deep well service. Communication of control fluid to the subsurface safety valve is controlled at a subsurface location in close proximity to the valve. Responsiveness of the subsurface safety valve to decreases in control pressure is thereby increased and the valve's closure speed is also increased. This abstract of the disclosure is neither intended to define the scope of the invention, which, of course, is measured by the claims, nor is it intended to limit the invention in any way.

Abstract: An injection gate of a mold cavity comprises an elongate valve rod which passes axially through a flow channel for molten plastic material and is guided in an extension of a thin-walled steel cylinder open at its opposite end toward an adjoining manifold plate. The rod extremity remote from the gate is secured to a tubular neck of a piston inside the cylinder whose stroke length is a fraction of the axial height of the cylinder's interior, a clearance around this neck providing space for drooling plastic while the length of the neck and of the peripheral cylinder wall serves for thermally insulating the manifold plate from the flow channel.

Abstract: In a well safety valve for controlling the fluid flow through a well conduit in which the valve has a housing and a valve element movable in the housing between an open and closed position for controlling the flow through a passageway in the housing and means for biasing the valve element to a closed position, the improvement in piston means for moving the valve element into an open position. A piston is telescopically mounted in the housing, is controlled by fluid from the well surface, and is offset from the passageway. The piston has a small cross-sectional area for reducing the effect of hydrostatic forces acting on the piston whereby the valve may be used at greater depths in the well. The piston has a diameter smaller than the diameter of the valve passageway for ease of manufacture and less expense. Preferably the piston is positioned within the wall of the housing, and may be a solid cylinder or may be tubular one outside diameter with a second lower section of a greater outside diameter.

Abstract: A gate valve for use with vacuum equipment is provided in which a gate assembly is opened and closed by a fluid operated device, such as a pneumatic cylinder. The gate assembly is enclosed in a valve housing. The valve housing has aligned openings therein, and the gate assembly is moved reciprocally between the walls and parallel to the planes of the aligned openings therein, to an open position and to a closed position with respect to the openings. The gate assembly comprises two gates which are intercoupled by a bellows, the bellows defining a hermetically sealed pressure vessel with the gates. The gate assembly is coupled to a piston in the pneumatic cylinder by a piston rod. The gate assembly is moved to its closed position when pressurized fluid is introduced to one end of the pneumatic cylinder; and the gate assembly is moved to its open position when pressurized fluid is introduced to the other end of the cylinder.

Abstract: A hydraulic control assembly especially suited for operation of a fail-safe valve. An integral structure is provided having a pair of check valves disposed in passageways extending from one chamber of a piston operator to a hydraulic reservoir and the other chamber of the piston reservoir, and in a fluid line extending from a high pressure source. In a fail-safe valve, cavity pressure normally acts on the valve stem and provides the force which moves the valve to its close position. A spring is disposed in the second chamber of the piston operator and, in conjunction with any force resulting from internal cavity pressure on the valve stem, aids in closing the valve. The second chamber is equal or greater in volume than the first chamber so that all of the hydraulic fluid displaced from the first chamber during valve closing can flow into the second chamber. In this way, the hydraulic power needed to pump hydraulic fluid back to the reservoir is not effected by installed hydraulic system variations.

Abstract: Disclosed is a tester valve having a ball valve rotatable between the open and closed positions for use with a test string to test an oil well. The apparatus includes a ball closing piston in the valve operating mechanism which assists in rotating the ball to the closed position. One side of the ball closing piston is exposed to a first pressure of formation fluid flowing through the interior of the test string on the upstream side of the ball valve. The other side of the piston is exposed to a second pressure which is lower than the first pressure by a pressure drop caused as the fluid flows through the apparatus past the ball being rotated to the closed position. A bypass mechanism is additionally disclosed which is operable for equalizing the pressure on both sides of the ball closing piston when the ball is being rotated to the open position.

Abstract: A gate valve operator having dual pistons, one having pilot pressure acting thereagainst thereby tending to open the valve, and one having line pressure acting thereagainst tending to close the valve. The line pressure piston's pressure surface area may be varied to compensate for wells having depleted pressure, and line pressure at all times tends to close the valve, i.e., the actuator is unbalanced.

Abstract: Disclosed is an apparatus and its method of operation for an oil well valve having a self adjusting liquid spring responsive to changes in pressure in the well annulus. The valve has a liquid spring contained in a spring chamber divided by a piston means which moves responsive to annulus pressure changes to operate the valve. The piston means includes a metering means to meter liquid from one side of the piston to the other as the volume of the liquid changes due to pressure and temperature changes. The piston means moves responsive to pressure changes in the well annulus which pressure changes are applied to the well annulus at a rate faster than the metering means may relieve the changes. A mechanical spring means in conjunction with the metering means returns the piston means to its original position after a predetermined time.

Abstract: A testing valve and its method of operation is disclosed for use in testing an oil well formation wherein the valve includes a liquid spring and operating means for operating the valve responsive to changes in the well annulus pressure. Volume adjusting mechanisms are also disclosed for compensation for a change in the volume of liquid as the valve is subjected to pressure and temperature gradients of the well as the tool is lowered in a well to testing depth.

Abstract: A quick-closing fire gate is provided having specific application to sectionalized production facilities using vibratory conveyors to transport volatile substances. The conveyor passes through a portal defined by a gate housing at each barrier wall. The gate door or blade initially positioned above the housing is knife-edged to sever the conveyor during its downward translation and is forced flush against the gate housing by the interaction of opposed inclined surfaces on the blade and its support structure. The inclined surfaces furthermore function to eliminate gate rebound by dissipating the kinetic energy of the falling blade and redirecting reaction forces away from the line of blade travel. The rapidity of gate operation is accomplished by a photosensitive cell detonating an explosive bolt which releases a pressurized piston connected to the gate blade.

Abstract: In a nuclear reactor installation, a live-steam line leading from each steam generator through the containment, is equipped with a fast-acting valve. If the pressure in the generator rises the valve operates as a safety valve and releases up to one-half of the aperture cross section of the valve, so that there is no danger of damage to the steam generators. According to the invention, the valve is operated for this purpose by two pistons by means of steam. The invention is of interest particularly for light-water reactors, e.g., pressurized-water reactors.

Abstract: A shut-off nozzle for the injection molding of fluid plastics. The nozzle includes an axial body component with a bore for transfer of the fluid plastic from the molding machine to the molding cavity through a nozzle head. The nozzle body carries thereon an actuating cylinder mechanism for selective actuation of a core plug and valve assembly. The valve is reciprocated to fully close or fully open a delivery bore in the nozzle head.

Abstract: A new and improved subsurface safety valve which is inserted into well tubing without requiring removal of the tubing, and which replaces worn, deteriorated and fully or partially inoperative safety valves in the well tubing to prevent blow-outs in wells. The replacement subsurface safety valve may be subsequently removed after insertion without requiring removal of the well tubing.

Abstract: This invention relates to a kitchen ventilating system, where a kitchen hood communicates through an exhaust duct to the exterior atmosphere, where a fan in the duct operates for powered venting of the kitchen, and where a damper can be closed to separate the kitchen from the exhaust duct. This invention teaches means for shifting the damper between the closed position and the open position, which means is a fluid power actuator in the form of a power cylinder. The power cylinder is operated by water, typically from the same source as the regular kitchen water, and control valve means utilized between this source of water under pressure and the cylinder controls the shifting of the damper. The preferred system provides that the valve means shifts by spring pressure to the position corresponding to where the damper is closed and is electrically shifted to open the damper, so that should a power failure occur the damper will automatically be closed.

Abstract: A gate-type sliding valve for the outlet of a casting ladle is provided with support arms on which can be pivotably mounted operating means in the form of a hydraulically actuated piston and cylinder and maintained in their operating position by a torque force created by an unbalanced disposition of the weight of the cylinder and piston relative to their pivot mount.

Abstract: A surface-controlled wire-line retrieval subsurface safety valve apparatus and method of utilizing the safety valve having a rotatable ball closure element and a movable operator mechanism that controls the operating stroke when the valve is operably installed as well as moving the ball and seat into sealing engagement.

Abstract: A valve actuated in response to a drop in fuel pressure across a fuel supply valve that will drain the fuel from a fuel line but not leak when exposed to high fuel pressures during normal operation. The dump valve is particularly applicable to the draining of fuel from a gas turbine engine fuel nozzle line after shutoff of the engine fuel supply valve.

Abstract: Disclosed is a pneumatic launch apparatus which employs separable telescoping tubes. The open ends of the tubes are provided with valves which automatically close upon separation of the tubes to trap operating gas in the tubes at the moment of separation.

Abstract: A venting valve for a steam decorticator has a valve chamber connected by way of a straight conduit to the pressure vessel of the decorticator. A replaceable valve seat is provided in the connection between the valve chamber and the conduit, and a valve, normally biased to its open position, is disposed in the valve chamber in such a position that direct flow of liquids from the conduit impinge on the head of the valve. The valve head is also replaceable.

Abstract: A valve for regulating flow in a flow passage with the valve actuating mechanism being isolated from contact with the material passing through the valve and being responsive to various external conditions and adjustments which enables the valve to be utilized in many installations. The valve includes a plug assembly disposed axially of the valve body and the plug assembly includes a hollow stem and transverse ports adjacent the head of the valve to define the flow path for material through the valve.

Abstract: Emergency shutoff valve apparatus, including a gate valve assembly actuated to a closed position by fluid pressure acting on an actuator piston, such actuation causing the piston to exert a force through a liquid medium on a power piston to store energy in a spring device or other energy storing means. Relieving of the fluid pressure acting on the piston causes the energy storing means to act through the power piston and liquid medium to shift the actuator piston to a position closing the gate valve assembly. The gate valve assembly can also be shifted to a closed position by supplemental fluid pressure acting on the power piston or on an override piston.

Abstract: A valve for a concrete pump having a front valve closing portion which in the closed position prevents flow through a T-pipe section, a supporting structure secured to the T-pipe section and an annular sealing band carried by the supporting structure and positioned about the valve closing portion.

Abstract: The valve is comprised of a substantially oblong chamber having one end thereof extending transversely into a conduit having a semi-circular slot formed therein. The portion of the chamber extending into the conduit is provided with a through passage in alignment with the conduit and a valve disc is movably mounted in the chamber for transverse movement relative to the conduit between an operative position in alignment with the conduit and an inoperative position outside of said conduit. An inflatable tube is secured in a peripheral groove in the circumference of the disc and is disposed in fluid communication with the interior of a hollow valve stem secured to the disc and extending outwardly of the chamber. A piston is connected to the valve stem for reciprocating movement in a double acting fluid cylinder and the extreme end of the valve stem extends into a chamber connectable to a source of air under pressure by a suitable valve to control the inflation of the inflatable tube.