Abstract: This invention provides a fluid control device capable of making compact a fluid control device in which a valve and a limit switch are combined. A valve 6 includes a piston 26 as a moving member which includes a protruding portion protruding from an opening of a casing 21, and which linearly moves according to opening and closing of the valve 6 so as to abut against a limit switch 7. The limit switch 7 is made to face the piston 26 and is attached via a limit switch positioning unit 8 so as to be adjustable about its position. The limit switch positioning unit 8 includes a first bolt 42 fixed to a body 2, a second bolt 43 fixed to the limit switch 7, and a connection screw 44 which connects both the bolts 42, 43. The first bolt 42 and the second bolt 43 have different pitches from each other.

Abstract: A stop valve is provided for a hydraulic system. The stop valve includes a valve slide that can be moved to a closed position and to an open position. A blocking device for limiting the activation of the valve slide is provided at an intermediate position located between the closed position and the open position, wherein, in this intermediate position, the opening cross section of the stop valve equals only a fraction of the opening cross section present in the open position. The blocking device is constructed such that limiting the activation of the valve slide by the blocking device is realized as a function of a pressure difference value between a pressure in front of and a pressure behind the stop valve, wherein the limiting can be canceled when the value falls below a given pressure difference value. This guarantees a pressure balance controlled according to the flow when the stop valve is opened.

Abstract: In a valve system or method, an actuator is provided with an actuating rod. A valve is actuated by the rod and has a valve stem and a valve member secured thereto. A travel limiting device defines a travel limit of the actuating rod. A setting mechanism sets the travel limit. The actuating rod and valve stem are decouplable from each other. The setting mechanism comprises a connector for coupling the actuating rod and the valve stem, the connector being designed to set an axial spacing between the actuating rod and the valve stem.

Abstract: A presettable gas valve is disclosed herein. The gas valve may have a maximum gas flow that can be adjusted to the particular requirements of the fireplace in which the gas valve is used. By way of example and not limitation, for real biomass/fuel burning fireplaces, the gas valve may be opened to its maximum level with a quarter turn of a handle. In contrast, for fake fireplaces, which require more gas flow compared to real fireplaces, the gas valve may be opened to its maximum level with a half turn of the handle. The maximum gas flow through the gas valve may be set during installation such that the user does not need to manually determine the appropriate amount of gas during use.

Abstract: A diaphragm valve for use in an irrigation system is disclosed that is adapted to reduce the water hammer effect, reduce debris in a flow path through a valve seat, improve bleed operation and/or reduce manufacturing and materials costs.

Abstract: An inflation valve is revealed. The inflation valve includes a longitudinal valve body, a valve member and an elastic member sleeved between the valve member and the longitudinal valve body. The longitudinal valve body includes an axially extending hole disposed therein, a projecting edge arranged on the axially extending hole and a round through hole disposed on a center of the projecting edge, and two alignment members having at least one projecting body and/or one concave slot. A round valve head is arranged on the front end of the valve member and alignment members corresponding to the alignment members of the longitudinal valve body disposed on an outer edge of the valve head. While being assembled, the valve head passes the through hole by alignment of the alignment members between the valve member and the longitudinal valve body and becomes staggered. Moreover, by the elastic member, the valve head presses and locks onto the round through hole to form a closed state.

Abstract: A water hammerless valve includes a pneumatically-operated valve having a valve disc for opening and closing a fluid channel by moving upward and downward through a pneumatic actuator operation, and a limiting mechanism for interfering with upward movement of the valve disc when the water hammer occurs. The limiting mechanism includes a stepping motor including a rotation shaft fixed on the upper actuator; a vertical movement component connected to the rotation shaft for moving upward and downward via rotation of the rotation shaft; a lower detecting component for detecting the fact that the vertical movement component contacts the upper end of a stem when the lower detecting component moves downward; and a control device for rotating the stepping motor, for controlling the air supply, and for transmitting a stop signal to the stepping motor when the lower end of the lower detecting component detects the fact.

Abstract: A valve includes a body, a cage, a plug, a stem, a stop ring, and a pilot plug. The cage includes at least one cage port there through allowing fluid communication between the fluid inlet and the fluid outlet. The plug is movable linearly within the cage to allow fluid communication between the fluid inlet and the fluid outlet when the valve is open. The pilot plug is adapted to transfer downward force from the stem to the plug by contacting the stop ring of the plug and thereby urging the plug downward through the cage when the stem moves linearly downward to adjust the valve from the closed position to the open position. In an alternative embodiment, the stem includes a collar adapted to contact the plug and adjust the valve from the closed position to an open position.

Abstract: An exhaust throttling valve (12) is provided for a vehicle. The valve includes a body structure (16, 41) having a bore (47) there-through. A shaft (28) is supported by the body structure for rotational movement. A valve member (34) is associated with the shaft such rotational movement of the shaft rotates the valve member. The valve member is disposed in the bore and is constructed and arranged to rotate between a first position substantially closing the bore and a second position at least partly opening the bore. A hard stop (56) is associated with the shaft so as to rotate therewith. First and second adjustment structures (52, 54) are constructed and arranged so that upon rotation of the shaft in one direction, the hard stop engages the first adjustment structure and upon rotation of the shaft in a direction opposite the one direction, the hard stop engages the second adjustment structure, thus limiting travel of the valve member.

Abstract: Methods and apparatus for positioning an orifice plate within a body having a straight flowbore. One embodiment includes a carrier supporting the orifice plate and a drive member operable to engage the carrier and move the carrier along a first axis perpendicular to the flowbore. The drive member is also operable to limit the movement of the carrier along a second axis perpendicular to the flowbore and perpendicular to the first axis. A pin is operable to engage the carrier so as to limit movement along the first axis.

Abstract: A temperature limit stop assembly for a mixing valve including a stop surface supported by a stem and a hot water stop shoulder supported by a stop member and engagable with the stop surface of the stem to limit rotational movement of a valve plate.

Abstract: A pneumatic pinch valve assembly having a lever, a piston supporting a pressing piece, and a fluid tube receiving space formed between the lever and the pressing piece for receiving fluid tubes is disclosed. Air is introduced into a cavity to actuate the piston in order to pinch a fluid tube between the lever and the pressing piece to intercept a fluid flow through the tube. A pinching action control feature is located between the piston and the pressing piece and is used to protect the fluid tube by limiting one or more amounts of compression of the fluid tube during operation. The amount of compression of the fluid tube is able to be adjusted so that the fluid tube is not easily deteriorated during long-time operation.

Abstract: The invention concerns pneumatic actuators for valves comprising a body closed by head flanges, two pistons moving in said body in opposite directions, an output shaft that turns actuated by the pistons, and a stop device on each head flange to limit the stroke of the pistons when they move away from each other towards the head flanges. On at least one side of the actuator body an adjusting device (22) is provided which includes stop means (26, 27) at varying distances from each other in a direction parallel to the movement of the pistons and arranged in a position to intercept and limit the stroke of the pistons when the latter move towards each other.

Abstract: A control valve having an external valve trim adjustor is provided. The control valve comprises a valve shaft comprising a contact member extending in a direction transverse to the valve shaft, a stationary valve cap adapted to receive the valve shaft, an adjustment member coupled to the valve cap, and a stop plate coupled to the contact member and threadedly coupled to the adjustment member, the stop plate positioned at least partially between the adjustment member and the contact member and adapted to position the contact member away from the valve cap in response to manipulation of the adjustment member.

Abstract: A valve has a valve piston, at least one coil and at least one magnetized component. An induction voltage is induced in the at least one coil, by a movement of the valve piston in the valve through a magnetic field produced by the magnetized component. A reference point is acquired, which is representative of a start of a current activation cycle of the valve. In the current activation cycle a point is determined as a function of a characteristic pattern of the induction voltage, which is representative of an end of a movement process of the valve piston in the valve. A current response time is determined as a function of the point and the reference point. At least one error condition is determined as a function of the response time. An error is identified, when the at least one error condition is satisfied.

Abstract: A remotely controlled lockout device for an in-line gas flow control valve has a control shaft adapted to be operatively connected to a gas flow control valve and operable between a gas flow control valve open and closed position and a rotatable lock member operatively connected to the control shaft and rotatable between a lock member unlocked position in which the control valve is operable between gas flow control valve open and closed positions and a locked position in which the control valve is locked in a gas flow control valve closed position.

Abstract: A valve system regulates the air pressure in the space(s) between a residual limb, or liner-covered limb, and a hard socket of an external prosthesis, and may include a manually-controlled air outlet and inlet valve on a distal region of a hard socket, and/or an automatic one-way outlet valve. The manually-controlled valve is opened and closed by partial rotation/twisting of a handle portion, which creates slight separation of the handle and base portions through which may pass air. The handle and base are prevented from becoming entirely separated during normal use by a snap-fit of the base onto the handle that retains the ability of the handle and base to rotate relative to each other by means of a ramp system, and a stop(s) that limit(s) the amount of relative rotation of the handle and base portions of the valve.

Abstract: The present invention relates generally to fluid control valves and, more particularly, to a mixing valve for use within a faucet.

Abstract: A duel fuel gas control valve controls the supply of gas (e.g., natural gas or liquid propane gas) to a gas grill. The duel fuel gas control valve is structured to control either natural or LP gas flow at the desired operating characteristics based on conventional gas supply characteristics and gas grill requirements. A restrictor mechanism, when in first and second configurations, respectively, restricts movement of the valve core to a first predetermined range for a first mode of operation (first type of gas supply) and to a second predetermined range for a second mode of operation (second type of gas supply).

Abstract: A diverter valve may include a body portion and a lid portion. The lid and body portions may define a fluid chamber. The lid portion may include a first stop and a second stop. A closure member may at least partially be received within the fluid chamber. A movable member, such as a handle, may be operatively associated with closure member. The movable member may be selectively movable relative to the lid portion between the first and second stops. A stop member may be selectively positioned on the lid portion. When positioned between the first and second stops, the stop member may limit movement of the movable member to between the stop member and one of the first and second stops. The first stop, the second stop, or both, may also comprise a stop member.

Abstract: A hydraulic flow control valve allowing easy adjustment of fluid flow for a variety of hydraulic attachments is disclosed. The hydraulic flow control valve comprises a spool and a flow rate setting adjustment device configured to adjust a flow rate setting of the hydraulic flow control valve by adjusting the amount of travel allowed for the spool. An associated method of operating the hydraulic flow control valve is disclosed.

Abstract: A diverter valve may include a body portion and a lid portion. The lid and body portions may define a fluid chamber. The lid portion may include a first stop and a second stop. A closure member may at least partially be received within the fluid chamber. A movable member, such as a handle, may be operatively associated with closure member. The movable member may be selectively movable relative to the lid portion between the first and second stops. A stop member may be selectively positioned on the lid portion. When positioned between the first and second stops, the stop member may limit movement of the movable member to between the stop member and one of the first and second stops. The first stop, the second stop, or both, may also comprise a stop member.

Abstract: Methods and apparatus for positioning an orifice plate within a body having a straight flowbore. One embodiment includes a carrier supporting the orifice plate and a drive member operable to engage the carrier and move the carrier along a first axis perpendicular to the flowbore. The drive member is also operable to limit the movement of the carrier along a second axis perpendicular to the flowbore and perpendicular to the first axis. A pin is operable to engage the carrier so as to limit movement along the first axis.

Abstract: A mixer valve includes a rotational assembly for selecting a temperature of the water up to a maximum temperature. The rotational assembly includes a selectable “comfort” temperature indicator, that can be set independently of the maximum temperature, and does not affect the maximum temperature. The valve also includes check valves for preventing cross flow between the hot and cold pipes. A check valve insert is provided which includes a shutoff for the water flow when removing the check valve for service. The shutoff and removal of the check valve can be effected with a single tool.

Abstract: A normally-closed valve having a microflow rate adjusting device includes a valve stem for opening and closing a fluid passage; a biasing device for biasing the valve stem in a direction to close the fluid passage; a piston body which is engaged in a cylinder in an air-tight manner to form a pressure chamber for moving the valve stem in a valve opening direction against the biasing device; and a stopper mechanism, provided on the cylinder, for controlling a limit of movement of the piston body in the valve opening direction. The stopper mechanism comprises a stroke adjustment member which is screw-engaged with the cylinder coaxially with the valve stem so that a position of the stroke adjustment member relative to the cylinder can be adjusted, and includes an annular tapered surface at an end of the stroke adjustment member which faces the piston body.

Abstract: A flow setting assembly is provided to permit field adjustment of an electronically actuated flow control valve, particularly a pressure independent characterized control valve (PICCV). In a preferred form, flow can be field adjusted by using a hex tool. Therefore, the maximum flow can be increased or decreased within the valve's adjustable flow range. As with all high close-off valves that employ a ball in their design, the ball passes well into the seat when rotated to the actuator's zero-degree position. Therefore, there is an amount of travel within the first degrees of ball rotation that passes back over this seat. The flow setting assembly eliminates this excess rotation (12°) resulting in a closed position that is offset to improve control resolution and system accuracy. This offset continues to allow the high close-off rating of 200 PSI. MFT actuators electronically adjust to and maintain the 2-10 Volt control signal at the reduced angle, as well as the 100 second running time and feedback signal.

Abstract: A blowout preventer including, in certain aspects, a main body, a bonnet movably connected to the main body, the bonnet having a bonnet channel with interior threading, a ram shaft with a first portion extending through the main body and a second portion extending through the bonnet, the ram shaft having a ram shaft channel therein and an outer end, a ram connected to the ram shaft for selectively engaging a pipe, a locking assembly for selectively locking the ram shaft, the locking assembly including a torquing shaft with a portion within the ram shaft channel, the torquing shaft having an external end projecting beyond the bonnet, a locking shaft secured to the torquing shaft, the locking shaft having exterior threading for threadedly engaging the interior threading of the bonnet channel, and the locking shaft rotatable within the bonnet channel to abut the outer end of the ram shaft to releasably lock the ram shaft in position.

Abstract: A gas valve assembly includes a solenoid coil, a linearly actuated plunger, and a stop member. The plunger is disposed in the coil so that a gap exists between the plunger and the stop member at a deenergized condition of the solenoid. The assembly includes a valve having a port and a closing member. The closing member blocks the port in a closed position corresponding to the de-energized condition of the solenoid, and slidably unblocks the port in an open position corresponding to the energized condition of the solenoid. An adjustable length member is coupled to the closing member and the plunger and has a portion accessible external to the valve assembly. The externally-accessible portion of the adjustable length member is adjustable to vary the size of the gap between the plunger and the stop member when the closing member is in the closed position.

Abstract: The present invention relates generally to fluid control valves and, more particularly, to a mixing valve for use within a faucet.

Abstract: A valve device of an application device for applying fluid to a substrate comprises a valve body, a valve housing with inner chamber and valve seat, a supply fluid chamber, an electromagnetic valve actuating device with valve piston and an adjusting piston. The valve nozzle is detachably mounted on the nozzle side of the valve device. The valve device has a nozzle plate which closes the valve body at the bottom on the nozzle side, with mounting opening for the valve piston. The valve housing is designed in the form of a nozzle orifice which is a closure member that can be fitted on the mounting opening from below and removed. The valve nozzle forms part of the valve housing. The valve piston is exposed through the mounting opening of the nozzle plate for removal and fitting when the closure member is removed. The valve device is provided with at least one rectilinear fluid duct that connects the supply fluid chamber to the valve seat.

Abstract: A replacement for a flow shut off valve is disclosed. A typical flow shut-off valve is normally located between the water supply and the user operated valves that supply water to a faucet. The improvements in this application provides a replacement flow shut off valve where the flow control valve has finite flow steps to reduce water that wasted when the user's valve is fully opened. The valve has features for a lock that eliminates an unauthorized person from fully opening the valve without unlocking the valve. In addition to the valve providing water savings from the regulation the lower flow through the faucet reduces splatter from the faucet from high flow or pressure water bounces off the bottom of a basin.

Abstract: The invention relates to the metering of fluids at low flow rates. More particularly, the invention provides a flow regulator for flows as low as about ½ ml per hour, provided with locking means for any set value within its range. The flow regulator comprises: an inner non-revolving core element, an outer housing, having a hollow base section and being revolvably supported co-axially with the core element, first and second chambers disposed between the core element and the outer housing, each chamber having an inlet and an outlet, the outlet of the first chamber and the inlet of the second chamber being connected by a flow restriction path, a diaphragm separating the two chambers and sealing an inlet to a discharge tube when pressure in the first chamber is higher than pressure in the second chamber, and a circular spring placed in the secondary chamber below the diaphragm and around the discharge tube.

Abstract: A retaining cylinder is threadedly engaged with a fixed cylinder of a flow rate control valve, by means of a screw section formed on an outer circumferential surface. A fence cover, which is capable of expanding and contracting in the axial direction, is installed between the fixed cylinder and a float rod supported by the retaining cylinder. An upper seal member is provided on the float rod, on the upper side thereof with respect to a valve plug. A lower seal member is provided on the lower side thereof with respect to the valve plug. The upper seal member and the lower seal member have substantially identical diameters. The float rod is displaced under an energizing action of a stepping motor. The flow rate of a fluid is controlled depending on a distance of the valve plug with respect to a valve seat.

Abstract: A valve actuator including a body, a rotatable drive screw having an external thread over at least a portion of its length and extending through the body and projecting out at least one side of the body. An internally threaded member is captured on the drive screw on the interior of the body, the member being held against rotation during rotation of the drive screw, so as to cause the member to travel along a length of the drive screw as the drive screw is rotated in both a first and second rotational direction. At least one sleeve having an abutment surface engagable by the member upon a sufficient rotation of the drive screw in one of the two directions. The sleeve surrounds the drive screw and may be axially adjustable relative to the drive screw from the exterior of the body.

Abstract: A flow rate regulation valve comprising a housing (11) formed with a valve hole (13), a needle valve (60) moved relative to the valve seat (16) in the housing, and a flow rate adjust knob (40) mounted at the proximal end of the needle valve extending from the housing, wherein the needle valve is moved relative to the valve seat by rotating the flow rate adjust knob thereby regulating the flow rate of fluid flowing through the valve hole, the flow rate regulation valve further comprising a knob fixing means (35) for stopping the rotation of the flow rate adjust knob. As a result, the flow rate is prevented from being changed accidentally by a user or the like. Further, the value may have a seal adjust means (20) adjusting the sealed state between the housing and the needle valve. The seal adjust means may be formed as a part of the housing, and may be fixed to the housing by a fixing pin (15).

Abstract: A valve with a flow adjustment device in the form of a valve stem travel limiter includes a collar having a passage therethrough to receive a valve stem having a projection, the collar further includes a plurality of grooves having different depths. The flow adjustment device may be assembled to a valve stem to permit a plurality of different predetermined valve stem travel limits corresponding to respective different maximum flow capacities of the valve.

Abstract: A control valve having an external valve trim adjustor is provided. The control valve comprises a valve shaft comprising a contact member extending in a direction transverse to the valve shaft, a stationary valve cap adapted to receive the valve shaft, an adjustment member coupled to the valve cap, and a stop plate coupled to the contact member and threadedly coupled to the adjustment member, the stop plate positioned at least partially between the adjustment member and the contact member and adapted to position the contact member away from the valve cap in response to manipulation of the adjustment member.

Abstract: An actuated valve having a rotatable cam that controls an opening and closing disc and stop members for the cam, the cam having a notch that allows the cam to be stopped between fully open and fully closed, and an adjustable member on the stop member that corresponds with the notch that allows the cam to be rotated to the fully open or fully closed position. A method of thermally cracking at least one of whole crude oil and natural gas condensate using the actuated value.

Abstract: A control stop for a flush valve for a urinal or toilet fixture includes a housing defining a flow chamber divided by a valve seat into inlet and outlet sections. A valve structure is biased toward the valve seat by a spring applying a valve closing spring force. The housing is sealed by a diaphragm, and the diaphragm covers the movable valve structure, isolating it from water flowing through the housing. The diaphragm does not impede valve structure movement, and the closing spring force establishes a threshold water supply pressure for opening the control stop during increasing pressure following a no or low supply pressure condition. A plurality of control stops may supply a bank of flush valves and fixtures, and open in a cascading sequence during increasing pressure as a result of having springs with different closing spring forces.

Abstract: A damper assembly, comprising an adjustable locking means for releasable retention of an element pivotally in one of a plurality of predetermined lock positions for adjusting air flow through an opening.

Abstract: An improved, reverse-flow diaphragm valve assembly having a valve member encased within a valve housing including a base portion, having inlet and outlet ports, and a bonnet. The valve member is carried by a resilient diaphragm in a pressure chamber. In a preferred form, a solenoid actuated valve can command the movement of the valve member between closed position and open positions. A hand settable control piston and spring manage forces on the diaphragm, allowing the user to set the pressure drop across the valve. The control piston has an enlarged portion, preferably a flared flange, for providing support for the resilient diaphragm to help prevent wear and damage so to prolong the life of the diaphragm.

Abstract: A system having a screw structure includes a casing and a self-tapping screw. The casing includes a through hole. The self-tapping screw includes a male thread portion and an unthreaded column portion arranged relative to each other in a longitudinal direction of the self-tapping screw, and is threadably coupled to the casing through the through hole. The through hole includes a large diameter hole portion and a small diameter hole portion. The large diameter hole portion is engaged with the male thread portion. The small diameter hole portion is engaged with the unthreaded column portion. The large diameter hole portion has a longitudinal length shorter than a longitudinal length of the unthreaded column portion.

Abstract: A valve with a flow adjustment device in the form of a valve stem travel limiter includes a removable and reversible collar having a passage therethrough to receive a valve stem having a shoulder, the passage further includes two bores having different diameters. The flow adjustment device may be assembled to a valve stem to permit two different predetermined valve stem travel limits.

Abstract: A valve with a flow adjustment device in the form of a valve stem travel limiter includes a collar having a passage therethrough to receive a valve stem having a projection, the collar further includes a plurality of grooves having different depths. The flow adjustment device may be assembled to a valve stem to permit a plurality of different predetermined valve stem travel limits corresponding to respective different maximum flow capacities of the valve.

Abstract: The faucet valve structure of two way automatic repositioning function includes a base ring, resilient spring, activating ring, and linking component. The base ring has a protruding block placed thereon. The resilient spring is placed on the base ring, which includes a first and second effector. The activating ring is placed on the resilient spring, which includes a first support that corresponds to the protruding block and a second support that corresponds to the second effector. The linking component is placed on the top end of the rotary base, and it has a crosswise protruding extension. When the user is using the faucet, whether it is on hot water mode or cold water mode, the brake valve shaft can be repositioned to the middle position, so that when the user is turning on the water regardless of warm or cold, it ensures safety from a burn injury.

Abstract: In a valve system or method, an actuator is provided with an actuating rod. A valve is actuated by the rod and has a valve stem and a valve member secured thereto. A travel limiting device defines a travel limit of the actuating rod. A setting mechanism sets the travel limit. The actuating rod and valve stem are decouplable from each other. The setting mechanism comprises a connector for coupling the actuating rod and the valve stem, the connector being designed to set an axial spacing between the actuating rod and the valve stem.

Abstract: Hydraulic valve actuation systems and methods to provide variable lift for one or more engine air valves by way of a variable position hard stop. Various embodiments are disclosed, including embodiments controlling lift by providing a choice of two different fixed stops, three different fixed stops, stops continuously variable throughout a range of lifts, and a fixed stop and stops continuously variable throughout a range of lifts. The valves controlled by a variable position hard stop may be a single engine intake or exhaust valve, or multiple valves of any number, and of either intake or exhaust valves or both, or of one intake or one exhaust valve for one or more cylinders in engines having more than one intake or exhaust valve per cylinder. Dashpot deceleration of engine valve velocity on opening to the hard stop and on engine valve closure is disclosed, as are other aspects and embodiments of the invention.

Abstract: The water flow control structure of a water gun includes a movable control tube, stepwise positioning unit, oblique guide and resilient component. When the control tube is moved by the control component, it is turned by the oblique guide and stepwise positioning unit. Each time the first guide of the control tube coordinates with the position of the stepwise positioning unit, it makes the space between the stopper head of the control tube and the water control outlet of the water holder close or open in different degrees to control water flow. The entire control structure is hidden inside the water gun. The repeated movements of the control component can switch the water flow mode, which is convenient and practical.

Abstract: A hydraulic blowout preventer operator comprises a first piston rod coupled to a closure member. The operator further comprises a first operator housing coupled to a bonnet and a head. The first piston rod extends through the bonnet into the first operator housing where is couples to a first piston disposed within the first operator housing. The operator further comprises a second piston rod coupled to the closure member. The second piston rod has a longitudinal axis that is parallel to a longitudinal axis of the first piston rod. The second piston rod extends through the bonnet into a second operator housing and is coupled to a second piston that is disposed within the second operator housing.

Abstract: A valve actuator including a body, a rotatable drive screw having an external thread over at least a portion of its length and extending through the body and projecting out at least one side of the body. An internally threaded member is captured on the drive screw on the interior of the body, the member being held against rotation during rotation of the drive screw, so as to cause the member to travel along a length of the drive screw as the drive screw is rotated in both a first and second rotational direction. At least one sleeve having an abutment surface engagable by the member upon a sufficient rotation of the drive screw in one of the two directions. The sleeve surrounds the drive screw and may be axially adjustable relative to the drive screw from the exterior of the body.