Abstract: A valve arrangement controls a flow of damping medium in a shock absorber. A radial column is provided with an axial failsafe flow such that the fail safe flow is not dependent on the exact axial position of the control valve member for creating the fail safe restriction, and less turbulence arise affecting the axial position of the control valve member. Thereby a valve arrangement is provided which has a more stable and reliable failsafe operation, resulting in a more dependable valve arrangement.

Abstract: A method for operating a controllable shock absorber may involve damping movement of a valve body by loading the valve body with a back pressure on an outflow side. Further, the controllable shock absorber may include a cylinder tube, a piston within the cylinder tube that divides the cylinder tube into two working spaces and includes a couple fluid leadthroughs connecting the working spaces, and first and second valve assemblies for damping piston movement in first and second actuating directions that are disposed on the leadthroughs. Each valve assembly may have a pilot control chamber and a valve plate that is either seated on or spaced apart from a valve seat in closed and open valve positions. Each valve plate can be prestressed closed by pressure loading the pilot control chamber. The pressures of the pilot control chambers can be set by a pilot control valve that comprises a movable valve body. As a result, an outflow cross section between the pilot control chambers and the working spaces can be set.

Abstract: This disclosure is to provide an anti-vibration device with reduced high frequency vibration. The anti-vibration device (1) according to this disclosure has: elastic bodies (4); and an intermediate plate (5) arranged between the elastic bodies (4) and connected to the elastic bodies (4). The intermediate plate (5) has an acoustic impedance (Z2) larger than the elastic bodies (4), and a perpendicular line (O) of the intermediate plate (5) is arranged between the elastic bodies (4) in a manner inclined with respect to the vibration input direction at an angle (?1).

Abstract: A sealing structure allows for formation of a side lip, as well as a labyrinth structure between an oil seal and a torsional vibration damper, even when a reinforcing ring has a short inward flange part. The sealing body 120 includes a side lip 124 extending from near a distal end of an inward flange part 112 radially inward and further toward an air side (A) than a dust lip 122 to a position not as far as the outer circumferential surface of a tubular part 210. An annular member 250 is further provided, which is fixed to the outer circumferential surface of the tubular part 210 further on the air side (A) than the side lip 124 and covering an outer circumferential surface of the side lip 124 such that there is a gap between the annular member 250 itself and the outer circumferential surface of the side lip 124.

Abstract: A torque transmitting device comprising a torque input element (17a, 17b) and a torque output element (8) able to pivot about an axis (X) with respect to one another, at least one elastic leaf (22), rotationally coupled to the torque output element (8) or to the torque input element (17a, 17b) respectively, the elastic leaf (22) being able to be elastically and radially held torest on a supporting member (18) carried by the torque input element (17a, 17b) or the torque output element (8) respectively, the elastic leaf (22) being able to bend upon rotation of the torque input element (17a, 17b) with respect to the torque input element (8).

Abstract: A torsional damper for a torque transmission device, comprising: a first element (1) and a second element (2) rotationally movable with respect to one another; and a first damping means and a second damping means, each damping means comprising: an elastically deformable blade (9) having a fastening portion (12) and an elastic portion (13), an abutment element carried by the other of the first and second elements and configured, for an angular deflection between the first and second elements with respect to an inactive angular position, to apply a flexural load onto the blade, the elastic portion of the blade of the first damping means proceeds circumferentially beyond the fastening portion of the blade of the second damping means.

Abstract: A torsional vibration reducing device includes: a rotating body; an inertial body; a coupling member configured to transmit the torque to the rotating body and to the inertial body; and a first coupling portion and a second coupling portion, which are separately provided to either the rotating body or the inertial body The first coupling portion engages with the coupling member so as to: restrict movement of the coupling member in a rotational direction of the rotating body; and allow movement of the coupling member in a radial direction of the rotating body. The second coupling portion engages with the coupling member such that when the rotating body and the inertial body rotate relative to each other, a contact portion of the coupling member with respect to the first coupling portion moves in the radial direction of the rotating body.

Abstract: A flywheel for use in an automobile between an engine and a clutch assembly is provided. The flywheel is a circular member having an engine side and an opposite clutch side. An aperture is formed in the circular member having an axis, and the aperture is used to operatively attach the flywheel to the engine. A plurality of clutch fins and/or grooves are formed on the clutch side adjacent the outer edge of the circular member and spaced radially about the axis of the aperture of the flywheel. The clutch fins have a face that is generally coplanar with the clutch side of the circular member. The fins and grooves work to cool the internal components of the engine. Optionally, a second set of grooves and fins may be formed on the engine side of the flywheel to further aid in cooling the clutch disc and other engine components.

Abstract: Provided is a chain that can reduce friction resistance between the running chain and a chain guide with a simple structure. The chain 10 is formed of a plurality of plates 30, 50 including sliding plates 30 that are slidably guided by a chain guide G, the plates being coupled together with connecting pins 40 such that the chain is bendable. The sliding plates 30 each include a guide-side end face 31, and the guide-side end face 31 includes a recessed section 32 formed by cutting away part of the guide-side end face 31, and a guide sliding section 33 located on a front side in a chain running direction of the recessed section 32. The recessed section 32 includes a negative pressure canceling surface 32a at a front end thereof in the chain running direction.

Abstract: A roller chain includes pins, bushings, rollers, inner plates and outer plates. Two bushings are connected to one another in each case by way of at least two inner plates to form a chain link. Two consecutive chain links are articulately connected to one another in each case by way of each bushing being seated on a pin projecting beyond both ends of the bushing. At least one combination, which consist of two mutually frictionally engaged components—the pin and bushing on the one hand, the bushing and roller on the other hand,—include one component consisting of austenitic stainless steel with an S-phase formed at least on the surface by way of nitriding at a temperature between about 400° C. and 500° C., and another component consisting of a stainless ferritic steel, which at least on the surface, is nitrided at a temperature between about 1000° C. and 1200° C.

Abstract: A mechanical converter of irregular bi-directional motion into continuous and consistent single direction motion through a system of gears, drive shafts, freewheels, and flywheel. The system works by transforming circular movement, both clockwise and counterclockwise from the input shaft into continuous rotation of an output shaft through the use of a pair of free wheels solidly connected to the input shaft which transfers the alternating motion, depending on the rotation of the input shaft, to two parallel secondary shafts.

Abstract: This mechanism for driving motions of a surface of spherical, ellipsoidal, plane, or other shape comprises a pair of drive wheels mounted on a freely pivoting frame, each wheel being driven by its own bidirectional motor. The motors and the active electronics of an angle encoder are mounted in an associated fixed frame, so no slip rings or other rotating connections are needed for motor power and control, or for determining the rotation angle of the pivoting frame. Control of the motors provides differential rotation of the two wheels to effect controlled rotation of the pivoting frame, and therefore of wheel direction. This avoids the use of a separate motor for changing the direction of motion of the surface.

Abstract: The present invention is directed to a self-locking non-backdrivable gear system. The gear system may comprise a primary motor input and self-lubricating gear box. The primary motor input is for rotation of the gearbox about the axis of a drive shaft. The gearbox may comprise an input ring gear, one or more planet locking gears, fixed spur gear, and output spur gear. In operation, rotation of the primary motor input causes rotation of the ring gear which causes rotation of the planet locking gear which causes rotation of the output spur gear which causes rotation of the drive shaft. However, in the absence of rotation of the ring gear, a rotational force applied to the output spur gear causes the gear teeth on the fixed and output spur gears to lock the planet gear in place.

Abstract: Some embodiments are directed to a gearbox including first and second rotational members, the first rotational member having a shaft portion extending away from the gearbox, the first rotational member carrying one or more projections, the second rotational member carrying one or more complementary projections, the projections carried by the first rotational member being configured to be drivingly engaged with the complementary projections carried by the second rotational member to transmit torque in a first torque connection but not in a torque connection that is opposed to the first torque connection. The gearbox further includes a one way clutch adapted such that the first and second rotational members can be drivingly engaged to transmit torque in a second torque connection, wherein the second torque connection is opposed to the first torque connection.

Abstract: A transmission comprising: a casing having: a first shaft having a truncated cone portion, a second shaft parallel to and spaced away from the truncated cone portion, a first gear mounted on the second shaft, the first gear being configured for rotation with the second shaft, the first gear being in connection with the first shaft, a linear actuator connected to the first gear, the linear actuator allowing to position the first gear at any one of a plurality of positions along the second shaft, the truncated cone portion having, at its beginning and its end, a respective one of a set of gears with a respective diameter and a respective number of teeth being proportionate to a diameter of the truncated cone portion, at least two counter-wound spiral gear tracks extending between the respective one of the set of gear s and another one of the set of gears.

Abstract: An automatic transmission includes: a brake device including a friction plate set configured with fixation friction plates and rotation friction plates alternately arranged, a piston, and an oil pressure chamber supplied with oil pressure that moves the piston toward the friction plate set side; a first rotating member; and second and third rotating members arranged at both respective axial sides of the first rotating member and each having an outer diameter smaller than that of the first rotating member. The friction plate set and the oil pressure chamber are arranged at both respective axial sides of the first rotating member and also arranged at an outer periphery side of the second rotating member and at the outer periphery side of the third rotating member, respectively. The piston extends from the oil pressure chamber toward the friction plate set side through the outer periphery side of the first rotating member.

Abstract: A mechanical transmission system, MTS (100), for a steerable tool (500) which steerable tool (500) has a proximal end (20) and distal end (40) and comprises a shaft region (532), a bendable proximal part, BPP (534) that is omnidirectionally moveable, and a bendable distal part, BDP, (530) that is omnidirectionally moveable and moves responsive to movement of the BPP (534), which MTS (100) comprises a plurality of longitudinal members, LM (110) each having a proximal (20) and distal end (40), arranged in a longitudinal direction around a fictive tube (120), and has a corresponding transmission shaft region, TSR (132), transmission bendable proximal part, TBPP (134) and transmission bendable distal part, TBDP (130), wherein a plane section (114) of at least one LM (110) demonstrates an anisotropic area moment of inertia, and the majority of the LMs (110) are each axially rotationally constrained at 1 or more constraining points along the TBDP (130) or along the TSR (132) wherein the LMs are longitudinally slida

Abstract: This invention is a technological motor that increases, in each its period, the pressure of the gas that it compresses within the pressure volumes (BH) with the principle of communicating vessels, through the feature action—reaction of the mechanical system upon the acceleration of this system whose engine housing (MK) is the compressed gas tank. And this mechanic system is a motor which converts the potential energy in the compressed gases into kinetic energy without subjecting to chemical reaction. During these operations, the volume of the compressed gas in the engine housing (MK) does not change and it is not related to the mass volume of this motor, which is in direct proportion to the compressed gas pressure of the energy it produces. The motor with zero emission that is known for these features will be used in air, sea, land and space vehicles or charging their systems of these vehicles, which work with electrical energy, as the energy producer of the heating, cooling and lighting equipment.

Abstract: An assembly for converting motion comprises a first arm and a second arm rotatable about first and second fixed pivots; a third arm pivotably connected to the second arm; a first connecting arm pivotably connected to and extending between the first arm and the third arm; a second connecting arm pivotably connected to and extending between the first arm and the second arm; and a locking assembly comprising a first locking member and a second locking member, the first locking member connected to one of the arms and engaging with the second locking member at one or more positions from the retracted position to the extended position. The assembly may comprise the guide assembly comprising a guide member and an engagement member moveably engageable with the guide member.

Abstract: In exemplary implementations, a target rod is actuated. The target rod is part of a set of threaded, elongated rods, the longitudinal axes of which are substantially parallel to each other. The set of rods has an interior region and a perimeter region. Actuators induce vibrations in a set of perimeter rods. These vibrations are substantially perpendicular to the longitudinal axes. Furthermore, the vibrations are transmitted to interior rods, causing a target rod in the interior region to rotate about, and translate along, the longitudinal axis of the target rod. The target rod undergoes stick-slip motion relative to adjacent rods.

Abstract: A continuously variable transmission is configured wherein an outer diameter of a first pulley 11 is smaller than an outer diameter of a second pulley 12, a first input shaft 1? and a second input shaft 2? have a parallel coaxial structure, the first input shaft 1? and a first output shaft 14 are linked via a LO clutch 3? and a first transmission gear assembly 8; and the second input shaft 2? and a second output shaft 15 are linked via a HI clutch 3? and a second transmission gear assembly 9. In-low-speed mode, a drive torque outputted from the second pulley 12 is transmitted to a differential via the second transmission gear assembly, a second low-speed gear 23, and a low final gear 16, whereas in high-speed mode, a drive torque outputted from the first pulley is transmitted to the differential via a high final gear 18.

Abstract: A device includes a front cover, a torque converter main body, a lock-up device, and a dynamic damper. The dynamic damper is fixed to an output plate of the lock-up device. The dynamic damper has a base plate, an inertial body that includes inertia rings and lid members, and an elastic unit. The base plate is fixed to the output plate. The inertial body can rotate relative to the base plate. The elastic unit can generate a variable hysteresis torque according to a relative rotation angle difference between the base plate and the inertial body, and couples the base plate and the inertial body elastically in a rotation direction.

Abstract: A gear pair includes a first gear and a second gear that are engaged and paired with each other, wherein the arithmetic average roughness Ra of the tooth surface of the first gear is less than 0.10, and the arithmetic average roughness Ra of the tooth surface of the second gear is equal to or greater than 0.15. An improvement of the transmission efficiency is achieved due to the improved composite roughness of the gear pair. Accordingly, both of the improvement of the transmission efficiency of the gears and an improvement of the pitting fatigue life are achieved at low cost.

Abstract: The present disclosure relates to a chain ring having teeth positioned in one of three lateral positions. At least one tooth may be placed in each lateral position. At least half the teeth may be positioned in a middle lateral position. The teeth in the first and third lateral positions may apply opposing lateral forces to a bicycle drive chain.

Abstract: Torsional vibration dampers having a dual spring-dashpot system are disclosed that result in a lightweight hub and a lightweight inertia ring, which is concentric about the hub. The hub has a two-piece construction: a central hub defining an innermost sleeve that defines a bore for receiving a shaft; and a monolithic, generally-annular spoke defining an outermost ring concentric about and spaced radially outward from the central hub portion. A first elastomer member, which acts as a primary spring to damp torsional vibrations, is positioned concentrically against an inner surface or an outer surface of the outermost ring of the hub with the inertia ring concentrically positioned against the first elastomer member. A second elastomer member is positioned between and operatively couples the central hub to the annular spoke, thereby attributing a flexibility to the hub.

Abstract: A control system for monitoring a torque converter in a machine is disclosed. The control system includes a first speed sensor associated with a driving shaft of the torque converter. The first sensor is configured to measure an input speed of the torque converter. The control system further includes a second speed sensor associated with an output shaft of the torque converter. The second sensor is configured to measure an output speed of the torque converter. The control system further includes a processing module adapted to calculate a speed ratio based on the signals received from the first speed sensor and the second speed sensor. The control system further includes an output module adapted to provide indication for a seized condition of a one way clutch in the torque converter based on the speed ratio.

Abstract: An apparatus and system for supporting a planetary carrier within an aircraft gearbox includes a retainer for engaging a rotor mast and for supporting the planetary carrier.

Abstract: A method for determining a conveying capacity of a hydraulic pump includes opening a blockable flow cross-section in order to connect a pressure side of the hydraulic pump to an area of the hydraulic system through the flow cross-section after operating the hydraulic pump driven at a defined rotational speed. The flow cross-section is configured with the hydraulic pump such that an entire conveying volume flow provided by the hydraulic pump is guided through the flow cross-section when the flow cross-section is open. The method further includes comparing a change to an operating state of the transmission resulting from opening of the flow cross-section to a reference change to the operating state and determining the conveying capacity of the hydraulic pump as a function of a deviation between the change to the operating state and the reference change to the operating state.

Abstract: A shift position switch controller includes a reference position learner, learning a reference rotation position of an electric motor in a reference shift position, a target position setter, while setting a target rotation position based on an absolute rotation position detected by an absolute position detector until a satisfaction of a first condition, which is an initialization of a learned reference rotation position in the reference shift position or a second condition, which is a post-switch shift position being set as the reference shift position in a shift position switch instruction that is input after the initialization of the learned reference rotation position, and setting the target rotation position based on a rotation position that is detected by a rotation position detector with reference to the reference rotation position serving as a rotation start position.

Abstract: When a butting control is performed at a low temperature at which an oil temperature of an automatic transmission is equal to or lower than a predetermined value, a driving condition changing process is performed. In the driving condition changing process, an execution period from a starting of the butting control to an ending of the butting control is divided into a plurality of sections on the basis of a rotation angle of a motor. By making a torque of the motor greater and a rotation speed higher in a starting-section than in an ending-section, the execution period of the butting control is made short. By making the torque of the motor smaller and the rotation speed lower in the ending-section than in the starting-section, an amount of deformation of a component is made smaller when a part of a component is butted against a limit position so that a reference position can be learned accurately.

Abstract: A hydraulic system according to the present invention includes a rotational shaft, a hydraulic rotor supported by the rotational shaft so as to be incapable of relative rotation, an output adjuster varying a volume of the hydraulic rotor, a control shaft tilting the output adjuster, a drive motor operating the control shaft around the axis, a drive shaft disposed on a reference axis same as the axis of the control shaft and operably driven around the axis by the drive motor, a deceleration mechanism decelerating rotary power input from the drive shaft and outputs the decelerated rotary power toward the control shaft, and a housing accommodating the hydraulic rotor, the output adjuster, and the deceleration mechanism, wherein the deceleration mechanism has a hypocycloid-type deceleration mechanism disposed on the reference axis.

Abstract: A method of adjusting a hydraulic drive system includes determining a forward park position value, a reverse park position value, an initial forward position value, and an initial reverse position value of a control device and using these values to calculate a forward buffer value and a reverse buffer value. The forward buffer value and the reverse buffer value are used to determine an adjustment amount for the drive system. The adjustment amount can be used to properly adjust a drive system to avoid system errors.

Abstract: A locking arrangement for a transmission of a motor vehicle, comprising a locking toothing; a locking pawl, wherein the locking pawl is pivotable about a first rotary axis; a control element, wherein the locking pawl can be brought optionally into engagement with the locking toothing via the control element; a drive unit, wherein the control element can be brought by means of the drive unit into a release position and a locking position; a holding mechanism, wherein the control element can be held by means of the holding mechanism in the release position and in the locking position; and a safety mechanism comprising an electromagnet, an actuator and a first elastic element, wherein the actuator is pretensioned in a first actuator position by the first elastic element and can be held in a second actuator position by the electromagnet.

Abstract: A park lock apparatus and control unit for a vehicle, the apparatus comprising: a locking member (28, 30; 50) having: a first state arranged to permit independent rotational movement of front and rear drive shafts (20, 22) of the vehicle relative to a fixed position on the vehicle; a second state arranged to prevent independent rotational movement of the front and rear drive shafts of the vehicle relative to the fixed position on the vehicle; and a third state arranged to prevent rotational movement of the front and rear drive shafts of the vehicle relative to the fixed position on the vehicle, and an actuation member (36; 64) for moving the locking member between the first, second and third states.

Abstract: A system for the contactless sealing of a rotatably mounted shaft with respect to a housing, and a gear unit, oil being provided in the interior of the housing, in particular, the rotating shaft protruding from the interior into the outer area; a centrifugal disk, joined in rotatably fixed manner to the shaft, having at least partially radially extending bores that connect oil from a centrifugal chamber to a collection chamber surrounding the centrifugal disk.

Abstract: A circumferential seal for a machine having a rotating shaft is provided. The seal may comprise a metallic mounting element and a ceramic sealing runner. The mounting element may be affixed around the shaft and comprise a base and a mounting member. The mounting member may extend radially outward from the base and axially along the shaft to form a radially inward facing cylindrical surface. The sealing runner may have a radially outward facing surface and be carried by said mounting element in axial and radial alignment by an interference fit between at least a portion of the radially outward facing surface of the runner and at least a portion of the radially inward facing surface of the mounting member.

Abstract: Provided is a mechanical seal includes a fluid introduction groove provided in a sealing face of a stationary sealing ring and having an opening portion which is opened to the sealed fluid and an end portion which is provided opposite to the opening portion. The end portion being located between respective sealing faces S, the fluid introduction groove introducing the sealed fluid from the opening portion to a clearance between the respective sealing faces S. The fluid introduction groove is provided to be inclined at an acute angle to the sealing face S of the stationary sealing ring in a direction from the end portion to the opening portion.

Abstract: A circumferential seal for a rotating machine having a ceramic runner and support system is provided. The circumferential seal may comprise a sealing runner having a radially inward facing surface and a mounting element. The mounting element may comprise a radial pilot, an axial flange, an isolating element, a spring element to provide an axially clamping force to the runner, and a support ring extending axially along a shaft a distance greater than the radially inward facing surface of the runner.

Abstract: In an embodiment, a mechanical seal includes: a bellows 10 sealing between a rotating-side seal ring 5 biased in the axial direction, and an outer periphery face of a rotational shaft 2; a case 11 fitted to the ring 5 and the outer periphery of the bellows 10; and a drive ring 12 tightening the bellows 10 to the shaft 2, wherein cutout grooves 5b running through in the axial direction are provided on the outer periphery area of the ring 5; detent cutout areas 5d are provided on the side face of the ring 5 on a sealing face S side in a manner extending in the circumferential direction from the cutout grooves 5b; and detent convex areas 11e are provided at the edge area of the case 11 on the ring 5 side in a manner facing the cutout grooves 5b and bulging in the inner-diameter direction.

Abstract: A dust seal for sealing a gap between an opening and a shaft inserted through the opening includes a dust seal body in an annular shape and a bushing in an annular shape. The shaft is slidably inserted through the bushing. The dust seal body includes an attaching portion, a first accordion unit, and a second accordion unit. The first accordion unit and the second accordion unit are arranged side by side in a direction of an axis. The first accordion unit is integral with the attaching portion, is joined to the attaching portion at an outer periphery, and is fixed to the bushing at an inner periphery. The second accordion unit is fixed to the attaching portion at the outer periphery, and locked to the bushing at the inner periphery.

Abstract: A waste gate valve actuator, that may be used for an exhaust gas turbocharger of a motor vehicle, may have a flap with a base surface to be supported on an edge of an inlet or outlet opening of a waste gate channel and a channel-side elevation, which at least in one cross section along its axial direction exhibits an outer contour with a first section and an adjoining section facing away from the base surface. The outer contour in the first section may have at least one outer tangent that includes a first angle deviating from zero with the axial direction, and in the second section may have at least two outer tangents spaced apart from each other in an axial direction that include the same second angle angle deviating from zero and the first angle with the axial direction, and/or wherein the elevation exhibits in particular a flat front surface facing away from the base surface, which in relation to the base surface-side floor surface of the elevation is offset toward a rotational axis of the flap.

Abstract: A valve assembly can include a valve body, a seat, and a seat cover. In one aspect, the valve body can include an inner surface and an outer surface. The inner surface can define a body bore and a valve body groove having a bottom groove surface. The seat can include an inner surface defining a seat bore and an outer surface defining a seat alignment rib configured to be positioned in the valve body groove. In one aspect, the valve body groove can define a deformation gap between the bottom groove surface and an outer surface of the seat alignment rib. The seat cover can include an inner surface defining a seat cover bore. In one aspect, the seat cover can be mounted on the seat with an outer surface of the seat cover facing the inner surface of the seat.

Abstract: A vacuum pressure control apparatus includes an annular elastic seal member formed with a valve seat, and a doubly eccentric butterfly valve element configured to come into contact or separate from the valve seat. The vacuum pressure control apparatus is to be placed on a pipe connecting a vacuum chamber and a vacuum pump. The vacuum pressure control apparatus is configured to rotate the butterfly valve element in a first direction from a first valve closed position corresponding to an initial state to change vacuum pressure in the vacuum chamber. The vacuum pressure control apparatus further includes a control unit configured to rotate the butterfly valve element in a direction opposite to a first direction so that the butterfly valve element is moved to a second valve closed position different from the first valve closed position.

Abstract: Provided is a fluid controller which enables precise flow-rate adjustment while securing the durability. The fluid controller includes a stem vertical-movement-amount upper-limit-value setting means 10 which sets an upper limit value of a vertical movement amount of a stem 8 associated with opening and closing operations. The fluid controller further includes a stem vertical-movement-amount fine-adjustment means 11 which changes the vertical movement amount of the stem 8 associated with the opening and closing operations, within a range of not greater than the upper limit value.

Abstract: Provided is a fluid controller in which reduction of the accuracy caused by the loosening of a screw portion and reduction of the durability caused by torsional stress are prevented. A stem vertical-movement-amount adjustment means 11 is provided with: a handle 41 which has a female screw 41b on an inner periphery thereof and which is rotatably supported by a casing 4; a movable body 42 in which a male screw 46b is provided on an outer periphery thereof and is screwed into the inner periphery of the handle 41; and a guide means 43 which prevents rotation of the movable body 42 relative to the casing 4 and which enables vertical movement of the movable body 42.

Abstract: A control cylinder for a control valve, the control cylinder including a main body having through-openings. To optimize the flow and to reduce cavitation, the through-openings have an inside wall with a curved, oblique or conical profile and/or with edges and/or undercuts.

Abstract: A valve assembly adapted for use in oil and gas operations. In one aspect, the valve assembly includes a valve body defining an internal region, an inlet passageway, and an outlet passageway, the inlet and outlet passageways extending into the internal region; a valve seat connected to the valve body and defining a fluid passageway; a clapper extending within the internal region and defining an annular groove; and a seal extending within the annular groove of the clapper and adapted to sealingly engage the valve seat. In an example embodiment, the clapper is actuable between an open configuration, in which fluid flow is permitted through the fluid passageway; and a closed configuration, in which the seal sealingly engages the valve seat to at least partially restrict fluid flow through the fluid passageway.

Abstract: A pressure relief device for a double isolation valve comprises a body with a valve cavity. The valve body has a pocket formed therein. A disc is disposed in the central section of the pocket. The disc is interposed between two spring-actuated seats. Each of the seats is in fluid communication with opposing valve sides. The pocket central section is in fluid communication with the valve body cavity. Each of the seats is provided with two different types of gaskets in series. In operation, reverse pressure causes retraction of the seats, thereby relieving valve body cavity overpressure.

Abstract: An adjustable release pressure relief valve including a housing having an inlet and a relief outlet connected by a fluid flow passageway, the inlet fluidly connectible to a work string. A head is sealingly disposed within the passageway between the inlet and relief outlet closing the fluid flow passageway between the inlet and relief outlet. An elongate buckling rod supports the head and is bucklable at a predetermined load thereby permitting sliding of the head from between the inlet and a relief outlet and opening the fluid flow passageway. A lateral support projection is extendable within the housing to buttress the buckling rod along the longitudinal length of the buckling rod thereby increasing the load at which the buckling rod is collapsible.

Abstract: A mechanism for coupling motion of a piezoelectric actuator in axisymmetric devices like modulating proportional valves uses actuator extension motion to cause translation away from a mechanism mounting plane and thereby enables lifting open of a valve element instead of the usual pushing closed of the valve element. The mechanism does not contain any gears nor leadscrew threads, and in usual practice is constantly loaded, so apparent change of direction is achieved without mechanical backlash introducing hysteresis. The mechanism surrounds a piezoelectric stack actuator by contacting opposite ends of the piezoelectric stack, whereby extension motion lengthening the actuator causes a lifting portion of the mechanism to translate toward the bulk of the actuator while the proximally adjacent mounting portion of the mechanism remains at a fixed. location.