Abstract: A valve driving apparatus comprising a case proper provided in the interior thereof with a movement conversion-transmission mechanism, a cylinder mechanism freely detachably fixed to one end of the case proper and a piston rod supporting mechanism freely detachably fixed to the other end of the case proper so as to be applicable to any kind of valve merely by the replacement of the mechanisms between which the case proper intervenes.

Abstract: A subsurface safety valve for use in wells, preferably adapted for placement in a tubing string, having a lock open mechanism for temporarily maintaining the safety valve in the open to flow position. The safety valve includes a closure device, such as a rotatable ball, located in the flow passage of the valve and is opened and closed by a biased operator tube. The operator tube is movable in response to hydraulic fluid conducted to the safety valve operating on a piston carried on the operator tube. A shiftable sleeve and collet is positioned above the operator tube and has a profile for receiving a shifting tool. When shifted, the collet and sleeve act on the operator tube to hold the valve in the open to flow position. The collet engages a recess on the bore wall of the safety valve upon shifting, and the sleeve moves behind the engaged collet head to prevent unlocking. The safety valve can be returned to operation by shifting the sleeve and collet to their original, normal position.

Abstract: A high vacuum valve comprises a casing having a valve inlet port and a va outlet port connected to the inlet port with a valve seat defined between the inlet and outlet ports. The casing also defines a valve movement passageway and a valve member is movable in the housing along the passageway between a position in which it is aligned with the valve seat for closing the valve and one in which it is out of alignment with the seat to open the valve. The valve member includes two separate relatively movable plate parts both of which move along the passageway together and one of which is movable when the valve member is aligned with the valve seat so as to move into engagement with the seat.

Abstract: A safety valve for the production tubing of wells and/or fluid flow lines includes a valve element having both linear and rotary components of movement within a valve body and is actuated by a lost-motion rack and pinion gear actuating mechanism. The clam-shell pinion gear is moved linearly within the valve body by a hydraulic sleeve piston actuator for inducing valve movement responsive to hydraulic control of the sleeve piston. The sleeve piston is also responsive to upstream pressure for pressure actuation of the valve to its closed position. The valve element is also mechanically movable to its closed position. To facilitate opening movement of the valve, after an initial part of the opening movement of the sleeve piston assembly has occurred, pressure upstream of the valve element is communicated with the downstream side of the valve element, thus balancing pressure across the valve element and dissipating any pressure induced resultant forces that oppose valve opening movement.

Abstract: This valve actuator is primarily intended for use with rotary cut-off valves. It includes a housing which is attached to the valve body for receiving the valve stem and a longitudinal passage slidably mounting opposed piston elements. The piston elements include spaced shoulders which engage the remote end of a radial arm mounted within the housing and attached to the stem for rotating said stem. The radial arm includes a cam at the remote end having opposed cam faces alternately engaged by the piston elements and configurated to provide a minimum gap between the cam and the piston shoulders during the rotation of the valve between open and closed positions.

Abstract: An annular reservoir is defined by two mutually rotatable annular housing portions having suitable seals and friction reducing members that the housing portions can maintain fluid pressure within the reservoir despite relative rotation between them. Each housing portion is suitably ported for fluid transmission between the reservoir and an external point, such that one member may be connected to an external supply of fluid under pressure and to pressure controls, and the other member may be connected to a fluid powered mechanism such as an hydraulic cylinder, adaptable to perform a mechanical function such as closing or opening a valve. One housing portion may be channel shaped and the other may be receivable within the channel. A side of the channel shaped housing portion is removable to permit assembly and disassembly of the actuator.

Abstract: A universal operator is disclosed for rotating blade air, smoke and fire dampers, said dampers comprising a frame and a plurality of interconnected blades within said frame, said interconnection being in the form of a link bar which adapts all of said blades to open and close as a unit. The operator comprises a pair of pivotally connected members to form a knee-action joint which in turn is pivotally connected both to the damper frame and to said link bar. The operator also comprises stall type actuation means for selectively acting through the operator to control the degree of blade opening and bias means to return said blades to their normal operating position whenever said actuation means is disengaged.

Abstract: A valve driving apparatus is provided with cylindrical bearing members made of a synthetic resin or a copper alloy and used for a piston rod and for a drive shaft, a lining member made of a synthetic resin for coating the inner wall of an apparatus and a resilient member made of a synthetic rubber or a synthetic resin and inserted in a groove of a piston so as to protect the valve driving apparatus from the disadvantages of wear, frictional resistance and energy loss which are produced by a reciprocating movement of the piston and the piston rod. Also a valve driving apparatus utilizing a scotch yoke type movement conversion-transmission mechanism is provided with cylindrical bearing members made of a synthetic resin or a copper alloy and attached to pins installed on a piston rod so as to prevent the aforementioned disadvantages from occurring between the pins and the scotch yokes.

Abstract: An actuatable safety valve for the production tubing of wells and/or fluid flowlines includes a valve element having both linear and rotary components of movement within a valve body and is actuated by a lost-motion rack and pinion gear actuating mechanism. The clam-shell pinion gear is moved linearly within the valve body by a hydraulic sleeve piston actuator for causing control valve movement responsive to hydraulic control of the sleeve piston. The sleeve piston is also responsive to upstream pressure for pressure actuation of the valve to its closed position. The valve element is also mechanically movable to its closed position.

Abstract: An actuator for a rotary valve preferably embodying a diaphragm motor operated by pressure fluid. A driving sleeve is reciprocated linearly by the diaphragm motor and within said sleeve is a rotatable shaft, which is axially aligned with the diaphragm motor and driven by a ball screw. A driven sleeve is fixed to said shaft and receives the stem of the valve. All parts are in linear alignment. Means are provided for limiting the extent of the linear movement of the parts.

Abstract: An actuator for a valve, said valve including a cylindrical valve body having a valve member disposed therein with a first gear attached to said valve member. A second gear is provided for drivingly engaging said first gear to operate said valve member. A support member is adapted to be attached to the valve body, and a first frame is rotatingly connected to the support member so that the valve body may rotate relative to said first frame. A hydraulic cylinder is connected between said first frame and a second frame. The second gear is rotatingly mounted upon the second frame. The hydraulic cylinder selectively moves said second gear into and out of engagement with said first gear. A locking apparatus is provided for selectively locking the first frame to the support member means to prevent the first frame from rotating relative to the valve body when the locking apparatus is in the locked position.

Abstract: A power actuated kelly valve includes a cylindrical valve body having a valve member disposed therein with a first gear attached to said valve member. A second gear is provided for drivingly engaging said first gear to operate said valve member. A support member is attached to the valve body, and a first frame is rotatingly connected to the support member so that the valve body may rotate relative to the first frame. A moving apparatus is connected between the first frame and a second frame. The moving apparatus provides apparatus for selectively moving the second gear into and out of engagement with the first gear. A locking device is provided for selectively locking the first frame to the support member to prevent the first frame from rotating relative to the valve body when the locking device is in the locked position.

Abstract: A compact valve actuator for operating a valve of the butterfly type or the like. The actuator comprises a pair of joined pistons which respond by simultaneous reciprocation to introduction of operating fluid such as air into the actuator. Means such as a linkage for connecting the actuator to a valve is provided, such means being connected to the pistons interiorly thereof for minimizing the actuator size for a given required stroke. One of the pistons at a bearing surface thereof, rides on a guide means received interiorly of the piston thereby further enhancing the compactness of the actuator. The surface of the guide means is pressurized with the operating fluid applied to that one piston whereby risk of operating fluid leakage across that piston at the bearing surface thereof is substantially eliminated.

Abstract: A butterfly valve includes an annular valve seat and a disc-like valve member mounted both for rotation about an axis parallel to the valve seat and for axial displacement relative to the seat. The actuating mechanism automatically effects sequential motion of the valve member, first to rotate it to closed position and to shift it into sealed engagement against the valve seat, and vice versa, and includes structure which self-locks in the latter position.

Abstract: A testing apparatus for use in an oil well includes an improved circulation valve having a cylindrical housing with an open bore therethrough and a circulating port through a wall thereof. A valve mandrel is slidably received in the housing and movable from a closed position closing said circulating portion to an open position opening said circulating port. A shear pin is provided between the valve mandrel and the cylindrical housing and initially retains the valve mandrel in its closed position. The valve mandrel is arranged and constructed for engagement with a power mandrel of the testing apparatus upon movement of the power mandrel in a first direction so that said valve mandrel is forced in said first direction by engagement with said power mandrel and said shear pin is sheared to release the valve mandrel from its closed position. A biasing spring is provided for aiding movement of the valve mandrel to its open position upon shearing of the shear pin.

Abstract: A pneumatically operated press in which the moving press plunger (13) is actuated by a toggle linkage (20, 21, 22) which is itself actuated by a second toggle linkage (30, 31, 32). The end link (31) of this second linkage is actuated by a large diameter pneumatic ram (34) while the pivotal point (32) of this second toggle linkage is connected to a relatively small diameter pneumatic ram (36), or some other actuator. An automatic switch (42, 32) engages a valve to admit air to the larger ram (34) when the smaller ram (36) has moved the second toggle (30, 31) into an in-line position. The ram (36) may be replaced by a manual operating lever.

Abstract: A valve for automatically dumping a load of solids entrained within a fluid transport medium in response to flow interruption is disclosed. The automatic dump valve is particularly well-suited for use in combination with a nodule transport riser in deep ocean mining operations. The automatic dump valve system is combined with a tubular conduit defining a longitudinally extending flow passage having a sidewall opening defining a dump port. The automatic dump valve assembly includes a movable dump port cover plate and a hydraulic actuator coupled to the cover plate. The hydraulic actuator is operably responsive to pressure changes within the flow passage relative to the pressure exerted by a surrounding body of water to open and close the dump port.

Abstract: A flow control valve is disclosed comprising a valve housing defining a through flow passage, a valve member supported in the housing for pivotal movement with respect to the housing between an open position in which flow through the passage is enabled and a closed position wherein flow through the passage is blocked, and an actuator for moving the valve member between said position. A linkage transmits actuating force from the actuator to the valve member and, a force limiting device limits the actuating force transmitted to the valve member when the valve member is in its closed position.

Abstract: This scuba regulator second stage includes the following improvements:(a) a diaphragm assembly using a pair of generally conical flexible diaphragms facing each other and clamped together about a portion of their periphery, the unclamped peripheral sections flexibly spreading apart to function as an exhaust valve;(b) a "detune button" which prevents inadvertent turn-on of the breathable gas supply valve during unattended use of the regulator, and which is automatically disengaged when the user begins to breathe through the regulator;(c) a case configuration in which the breathable gas inlet tube is situated very close to the regulator mouthpiece so as to minimize the torque loading on the teeth of the user as the user's head is turned;(d) a unitary valve configuration in which the entire breathable gas flow valve assembly is removable from the regulator case as an integral unit, without the use of tools;(e) a valve poppet configuration which prevents tilting of the poppet when the breathable gas glow control

Abstract: An inside blowout preventer well tool includes an elongated body threaded at both ends and including an axial opening. A flapper is pivotally mounted on a side of the opening and movable between a lower-open position and an upper-closed position. A downwardly-facing valve seat is formed around the opening, the flapper engaging the seat in the upper-closed position. A spring urges the flapper toward the seat and a piston is movable in the opening between an upper position, where the lower end of the piston is above the valve seat, and a lower position, where the piston encases the flapper and holds it in the lower-open position. The piston is normally urged toward its upper position, the piston being shaped so that when the internal pressure of drilling mud normally circulating through the opening is greater by a predetermined amount than pressure outside the body, the pressure differential will overcome the force urging the piston upwardly and move the piston to the lower position.

Abstract: Apparatus for controlling fluid flow through a gate opening includes frame means that define the opening, and guide means which are adapted to retain a gate disc in slidable relation with the opening. Drawing means for laterally displacing the disc relative to the opening are pivotably connected to lever means having long and short ends. A fulcrum between the ends is pivotably connected to the disc. The short end is disposed to bear against a fixed portion of the guide means when the disc is closed, and the long end is connected to the drawing means to obtain a mechanical advantage in drawing pressure when displacing the disc to a partially open position. The lever means may be a single lever, but a preferred embodiment discloses a pair of levers to apply a uniform drawing pressure on the disc via a hydraulic cylinder that is anchored in a wall of a closed tank which contains the apparatus.

Abstract: A fail-safe-open actuator for actuating valves and the like which comprises a pair of opposed cylinders joined to define piston chambers, the axes of which are generally perpendicular to a valve stem. Pistons in the cylinders are connected to the valve stem by toggle links, the pistons being resiliently urged toward the ends of the assembly which corresponds to an open-valve position. To close the valve, a pressurized fluid, such as air, is introduced into the piston chambers and to the pistons at sufficient pressure to counter the resilient means so as to move the pistons away from their rest, valve-open positions, and thus move the valve stem perpendicularly to the axis of the piston chamber. A handwheel is provided to manually close the valve by moving the pistons from their rest positions.A solenoid controlled pneumatic valve may be used to control the supply of pressurized fluid, such as air, to the actuator.

Abstract: A mechanism for controlling two rotatable cut-off devices which are mounted in series in a shell for connection to one and the same pipe, comprises a jack in respect of each cut-off device, each jack being articulated to a lever fast with a journal of a respective one of the cut-off devices and to the shell in the zone thereof supporting the journals of the other cut-off device.The invention is particularly applicable to the valves for protecting a hydraulic machine in a high-fall hydraulic power station.

Abstract: A well safety system for controlling the flow of fluid through well conduits. The system includes a surface controlled subsurface safety valve made up as part of a tubing string extending from the well surface to a subsurface formation within a casing string. A packer, installed below the safety valve, forms a fluid tight seal between the tubing and casing to direct fluid from below the packer into the tubing. The safety valve contains lateral passageways which allow communication of fluid from the bore of the safety valve to the annulus between the tubing and casing above the packer. A valve actuator is releasably secured within the upper portion of the safety valve and forms a fluid tight seal between control fluid pressure in the tubing string above the safety valve and formation fluid pressure in the tubing string below the safety valve. The safety valve can be locked open when control pressure is increased above a preselected value and then released.

Abstract: A regulator for underwater diving having an improved first stage wherein the bias of the coil spring is varied by changing the relative position of the piston seat which can be readily accessed. The second stage of the regulator is capable of satisfying the human breathing demand with the use of a linkage ratio adjustment feature which coupled with the selection of the proper angle for the housing of the diaphragm permits the amplification and faithful tracking of the diver's breathing cycle. Also, exhaust means has been provided to facilitate the purging of extraneous fluids from the regulator in the most common positions of the diver. The above mentioned features, in combination, will provide a perfect match of the first and second stages of the regulator.

Abstract: A valve adapted for installation at the lower end of a drilling kelly for closing the bore of the kelly when adding a section of drill pipe so that the mud content of the kelly is not discharged onto the derrick floor; the valve also being adapted with minimum change in parts, to be inverted and installed at the upper end of the kelly to serve as a safety valve, providing blow out protection.

Abstract: A power-driven quarter-turn valve actuator includes a reciprocating drive member in the form of a rod mounted perpendicularly to and spaced a preselected distance from a valve stem. A crank arm is coupled to the valve stem so that the axis of the crank arm makes an angle of between approximately 60.degree. and 100.degree. with a line intersecting the stem axis and perpendicular to the rod axis when the valve is shut and makes an angle of between minus 30.degree. and plus 10.degree. with said line when the valve is fully open. A link member connects the outer end of the crank arm to a point on the reciprocating rod. The preselected distance between actuator rod and valve stem, and the lengths of the crank arm and link, are chosen to produce a variable actuator torque output curve that closely matches the operating torque requirements of the valve.

Abstract: A valve actuator has at least one piston in a cylindrical chamber that has a segmental skirt provided with transverse teeth on its chordal face meshing with lengthwise teeth on the hub of a rotor extending diametrically through the chamber with one rotor end exposed and provided with a portion for mating engagement with a valve stem portion when the valve is clamped to the actuator. Air is delivered into the chamber on opposite sides of the piston and the skirt is provided with anti-friction elements. Single and dual piston embodiments are disclosed as well as the use of springs by which the valve is operated in a wanted manner in the event of loss of piston operating pressures.

Abstract: In accordance with an illustrative embodiment of the present invention, a valve placed in a subsea blowout preventer stack during a production test of a well producing gas comprises a valve body containing two valve elements in series and a releasable control unit. A fluid to inhibit the formation of natural-gas hydrates can be injected into the valve body by means of a pump on the surface and through a high-pressure hose. A lateral connector fixed to the control unit is fitted in a sealed manner into a receptacle on the valve body to allow reconnection of the inhibiting fluid injection system.

Abstract: A valve for opening and closing a fluid conduit of the type having a generally wide cross section, the conduit having a transverse slit therein to allow for movement of a shut-off plate therethrough. The shut-off plate has a spherical shape and defines a center about which the shut-off plate may be arcuately displaced to close the conduit when the plate is positioned within the conduit and to open the conduit when the plate is positioned external to the conduit.

Abstract: A tank valve apparatus particularly adapted for effecting rapid discharge of the liquid contents of a tanker truck or the like, the apparatus being characterized by an improved valve opening apparatus actuated by an air cylinder. The cylinder includes a single acting piston requiring a certain cylinder pressure to move the valve to its open position, but requiring a significantly lower pressure to permit its return stroke, whereby rapid closure of the tank valve is facilitated.

Abstract: A venting valve arrangement for diecasting molds comprises a venting conduit for venting the mold cavity, a valve piston in the venting conduit, and an actuating piston exposed to the action of the casting material. The actuating piston and the valve piston have substantially parallel axes and are interconnected by a positive interlock of the two pistons, or parts actuated by the pistons in the manner of followers. Several axially parallel adjacent actuating pistons may be provided, all acting upon a common transmission piston.

Abstract: A dump valve apparatus is described which may be used to drain a chemical reactor tank. The valve includes a valve seat ring having a substantially vertical inner seat surface defining a discharge passage, a valve plug having a substantially vertical outer side surface which fits in the seat ring and a seal formed between such vertical sealing surfaces. The valve inlet and outlet openings are aligned with the vertical discharge passage through the seat ring and the sealing surfaces are vertical to minimize the amount of material deposited thereon. The outer plug side surface slides across the inner seat surface during opening and closing of the valve so that such surfaces wipe each other to remove deposited material and provide a self-cleaning valve. The inner seat surface is provided with a plurality of annular grooves containing elastic sealing members which engage the outer plug side surface to form a liquid tight seal which is resistant to the pressure created by the liquid within the tank.

Abstract: The disclosure concerns apparatus for draining coolant from the liquid cooling system of a locomotive. The apparatus includes an automatic control which is armed upon shut-down of the engine and drains the cooling system upon the occurrence of freezing temperature conditions. The apparatus must be reset manually, and this requires two distinct manipulations, one of which effects override of the automatic control. Such override action is limited in duration to prevent inadvertent, prolonged disabling of the automatic control. The drain valve is a pilot operated, rotary plug valve. Preferably, the apparatus includes provisions for manually draining the cooling system, for effecting automatic draining by the combined effects of gravity and compressed air, and for providing visual indications of its operating state. Moreover, as far as practical, it is desirable to package the components in a unitary assembly which can be replaced easily and bench serviced and tested.

Abstract: An actuator is provided for converting linear to rotary motion to manipulate a valve. Preferably, the actuator has a rotor which is rotatable about an axis and is operably associatable with the valve member. A pair of motors, preferably actuated by pressure fluid, each includes a reciprocal push rod assembly. Flexible means are coupled between the push rod assemblies of the motors and spaced apart points on the rotor such that when one of the motors is actuated, the respective one of the push rod assemblies is moved linearly in a direction to transmit torque to the rotor, thus causing the rotor to rotate about its axis in one direction and manipulate the valve member to one of open and closed positions, and when the other of the motors is actuated, the other of the push rod assemblies is moved linearly in an opposing direction to transmit torque to the rotor whereby the rotor is rotated about its axis in an opposite direction to manipulate the valve to the other of open and closed positions.

Abstract: A flow control valve for controlling liquid flow, for example, water flow in a vehicle heating circuit, has a ceramic obturator plate which slides sealingly relative to a fixed sealing plate, the two plates having openings the degree of overlap of which determines the valve throughflow. A bowed leafspring maintains the slidable obturator plate in sealing contact with a mating face of the sealing plate.

Abstract: An actuator for actuating valves and the like which comprises a pair of opposed cylinders, the axes of which are generally perpendicular to a valve stem. Pistons in the cylinders are connected to the valve stem by toggle links, the pistons being resiliently urged toward the center of the assembly which corresponds to a closed valve position. To open the valve, a fluid, such as air, is introduced between the pistons, so as to move them away from their rest (valve closed) positions. A handwheel is provided to manually open the valve by moving the pistons from their rest positions.A solenoid controlled pneumatic valve may be used to control the supply of air to the actuator. Either a failure in air pressure or an electrical failure will result in the pistons being urged to the rest positions and also result in closing the connected valve, i.e., the failure mode.

Abstract: Fluid motor actuator having two pistons reversely movable in a common cylinder, the pistons each carrying at least three extensions on their proximal sides, one of which being provided with a rack camming with one common spur gear fastened on a transverse shaft projecting from the cylinder, the extensions with their outer surfaces lying in one common cylindrical outer surface.

Abstract: A pressurized plate-type reversing valve for A/C systems having unobstructed straight through fluid reversal passageways with pilot and main operating valves and control connections built into the housing structure.

Abstract: A fluid control valve having a pair of blades arranged one above the other in superimposed relation for relative movement in parallel planes, each of said blades including means having a generally concave edge, and said concave edges when arranged in opposed overlapped relation cooperating with one another to define an opening whose size varies with the degree of overlap. Simultaneous movement of both blades is such that the edges of the openings therein move either toward or away from one another to vary the size of the opening without appreciably displacing the center thereof. A suitable reciprocating actuator serves as the means for simultaneously actuating both blades, one of said blades being directly connected thereto while the other is operatively associated with the blade so-connected by a rigid link.

Abstract: Disclosed is a sequential operating mechanism for valves for applications requiring actuation of one valve, or set of valves, prior to actuation of another valve, or set of valves. The equipment preferably includes an actuator driver mounted for powered selective reciprocation through a stroke of selected length. The actuator carries cam pins which engage cams (preferably cam slots) on cam plates attached to the stems of the respective valves during the course of an actuator half stroke. The cams are configured with respect to the paths of movement of the cam pins and with respect to the valve stems so that one valve is fully actuated to its extreme position before actuation of the other valve begins. If additional valves, in the same or different piping networks, require actuation at the same time as one or both of the cam actuated valves, such additional valves are ganged for simultaneous operation with the appropriate one of the cam actuated valves.

Abstract: A valve suitable for use in equalizing the pressure in chambers of a blast furnace charging installation includes a seat member which may be removed for servicing through translatory movement perpendicular to the valve flow axis. The valve is also characterized by a valve member mounted on a pivotal arm in such a manner that articulation of the valve member with respect to the end of the pivot arm is permitted.

Abstract: The gate for each conduit, of a preferably multiple conduit installation is transversally slidably mounted between full skirts. Dual hydraulic actuators drive a transversally extending rolling cam follow pin along an oblique path to slide the gate open and closed. The actuators have spring-assisted closure for fail safe operation, the actuator pistons being isolated from well pressure. Where there are two conduits so valved, the actuators for one extend longitudinally upwards from a central bulkhead, and the actuators for the other extend longitudinally downwards. Stem packing for the actuator piston rods is located in the central bulkhead. Modifications for accommodating, e.g. a third valved conduit are described. Also disclosed is a version with two, mutually inverted commonly housed gate valves controlling the same conduit.

Abstract: The present invention is a bi-directional valve actuator with a ratchet mechanism for use in combination with a control valve which includes a stem which, when turned, adjusts the flow through the control valve. The bi-directional valve actuator includes a frame which is mechanically coupled to the control valve adjacent to the other end of the stem of the control valve. The valve actuator also includes a shaft which is disposed within the frame and which is rotatably coupled thereto with the shaft being mechanically coupled to the stem of the control valve so it can turn the stem thereof, a first ratchet wheel and a second ratchet wheel. Each ratchet wheel is coaxially aligned with the shaft and is fixedly coupled thereto.

Abstract: A fluid flow controlling butterfly valve assembly is disclosed which comprises a valve body defining a through passage for fluid, a butterfly valving member supported within the body, a shaft extending transversely through the passage and drivingly connected to the valving member, and a shaft supporting structure rotatably supporting the shaft in the body while sealing against leakage from the valve.In a preferred embodiment the shaft supporting structure includes a band extending about the body and defining recesses aligned with shaft portions emerging from the body. Resilient flexible elements are disposed within the recesses and compressively engage the shaft and body to provide both bearings and seals.

Abstract: A valve actuator, for example a mechanism for imparting motion to a blast furnace evacuation valve, includes a force generator which is coupled to the valve member by a displacement mechanism including a pivotal lever and a pivot arm. The pivotal lever has a pair of angularly related arms with the free end of one arm being coupled to the force generator and the free end of the second arm being coupled to a point on the pivot arm intermediate the ends thereof by a connecting rod or rods. The pivot arm is connected to the valve member and the connecting rod or rods are articulated to both the pivot arm and to the second lever arm which may be telescoping.

Abstract: An exhaust gas pressure responsive valve assembly includes a first body of resinous material, a second body of metal material secured to the resinous material, a diaphragm member having an outer periphery held between both of the bodies so as to define an atmospheric chamber on the side of the resinous body and an exhaust gas pressure chamber on the side of the metal body, a spring biasing the diaphragm member against the exhaust gas pressure within the exhaust gas chamber, inlet and outlet ports provided in the resinous body, a passage provided in the resinous body for connecting the inlet and outlet ports, at least one metal plate secured to the diaphragm member, a guide member of resinous material secured to the metal plate, and a valve mechanism arranged within the guide member for controlling fluid communication between the passage and the atmospheric chamber in response to movement of the diaphragm.

Abstract: A gas generator, for example a blast furnace, is isolated from an exhaust gas treatment system by means of an isolation valve characterized by a valve housing which may be permanently installed in the gas delivery conduit. The housing has a laterally offset recess which receives the valve member when in the open position and the valve member may define a liquid receiving vessel in the interest of establishing a liquid barrier between the interior of the conduit and the valve seat when the valve is closed. The valve is preferably hydraulically operated and the actuator is mounted so as to minimize loading on the control shaft bearings.

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 fast closing shutoff valve having a self-contained hydraulic actuating system and an emergency pneumatic back-up system. The hydraulic system includes an accumulator for a high closing rate with a minimum size pump. The actuating system operates through a toggle linkage to reduce valve rate as valve nears closed position to reduce impact loads and increase closing pressure.