A valve actuator includes a motor and a gear assembly including an input gear rotated by driving force of the motor, an output gear receiving rotational force of the input gear, and at least one power transmission gear transmitting the rotational force of the input gear to the output gear. The valve actuator further includes a valve output shaft actuated to close a path of a valve, and a selective power transmitter selectively transmitting the rotational force of the output gear to the valve output shaft. The selective power transmitter includes a cam portion provided in at least one of the output gear and the valve output shaft. Accordingly, after the valve is actuated to close the path, the driving force of the motor is not transmitted to the valve output shaft.

An evaporated fuel treatment device is provided with an electric-operated valve, a positive-pressure relief valve mechanism and a negative-pressure relief valve mechanism. The electric-operated valve has a valve body for opening/closing a vapor passage allowing a fuel tank and a canister, and adjusts the flow rate by electrical control. The positive-pressure relief valve mechanism opens when the pressure at the fuel tank side has a value greater than or equal to a predetermined positive pressure value. The negative-pressure relief valve mechanism opens when the pressure at the fuel tank side has a value less than or equal to a predetermined negative pressure value. The electric-operated valve is configured such that the valve body is moved in the valve opening direction by the pressure at the fuel tank side that is higher, by a predetermined value, than the valve opening pressure for the positive-pressure relief valve mechanism.

A dual trip manifold assembly (TMA) includes an isolation valve assembly having a first valve configured to receive a flow of fluid from a hydraulic system fluid supply. The first valve is configured to channel the flow of fluid to at least one hydraulic circuit. The isolation valve assembly also includes a second valve configured to receive the flow of fluid from the at least one hydraulic circuit. The second valve is further configured to channel the fluid flow to a trip header. The first valve and the second valve are synchronized to each other such that rotation of one valve causes a substantially similar rotation in the other valve.

A number of variations may include a product comprising: a linkage system comprising: a first and second lever; a first interconnecting component and second interconnecting component operably connected to the first and second levers; a link bar having a first end with a first opening for receiving the first or second interconnecting component, and providing a clearance between the first opening and the first or second interconnecting component and; a second end with a second opening for receiving the first or second interconnecting component and providing a clearance between the second opening and the first or second interconnecting component; and a biasing device having a first and second end for engagement with the first and second interconnecting components and at least one section to allow for increasing or decreasing its length, wherein when the first or second end of the biasing device is engaged with one of the first or second interconnecting component and an external force is applied to one of the first or second ends of the biasing device to cause the biasing device to either increase or decrease in length to allow engagement with one of the first or second interconnecting component and to store energy, and wherein when the external force is removed from the biasing device, the stored energy of the biasing device provide a force that causes the first and second interconnecting components to move in a direction that overcomes the clearances between the first and second interconnecting components and the first and second openings of the link bar and provides contact between the first and second interconnecting components and the first and second openings of the link bar and wherein the contact is maintained by the force provided by the stored energy.

A control valve includes a shaft, a stopper mechanism, and a can. A stator coil is coaxially mounted around the can. Positions in a rotating direction of the rotor and the stator when the shaft is stopped by an operation of the stopper mechanism are set to be reference positions at which magnetic poles of the stator and those of the rotor are opposite to each other. The rotor is configured to be stopped at the reference position by an arrangement of the stopper mechanism. The stator coil is positioned relative to the body according to a positional relation between a fitting part formed on surfaces of the stator and the body attached to each other and an insertion part where the can is inserted into the stator, and magnetic poles of the stator and those of the rotor are made opposite to each other at the reference positions.

A gas shut-off valve for installation in gas meters, has a valve disk that can be moved in the longitudinal direction with respect to its valve seat. The movement is realized by a linear unit held in the longitudinal direction in a valve casing, which is actuated by an electric motor via reduction gearing. The valve seat has a lip seal. The electric motor is a small DC motor. The reduction gearing and the linear unit, are installed in a panel of the valve casing. The linear unit is a rack-and-pinion gearing or a sliding-screw gearing, having an adjusting-nut element and an adjusting rod.

An exhaust gas flap drive for an internal combustion engine, including a driveshaft which has a central axis m, an exhaust gas flap shaft, which is indirectly connected to the driveshaft and has a central axis k, and a coupling element, which is designed as a spring. The coupling element has a first end portion which is rotationally fixed to the driveshaft, and the driveshaft has a receiving area in which the end portion is mounted. The coupling element additionally has a second end portion which is rotationally fixed to the exhaust gas flap shaft via a coupling element, and the receiving area is designed as a groove which is provided on the end face of the driveshaft. The groove has a groove base and two groove flanks which delimit a width b of the groove. The width b decreases towards the groove base, and/or the coupling element has a form-fitting connection with the second end portion in a direction of the central axis k.

An actuating device for displacing a control device, such as a valve, gate valve, or the like, particularly for use in oil or gas production systems. The actuating device includes at least one torque motor having an electric drive and a thread drive that is rotatable by the electric drive. The actuating device also includes a threaded spindle, a screw nut, a torque control/regulation device, and a position detection device. The threaded spindle is axially displaceable to displace a flow control device between an advanced position and a retracted position. The torque motor is connected to the screw nut in a rotationally-fixed manner and the position detection device is assigned to the threaded spindle to determine the axial position thereof.

An actuator includes housing having a reciprocation axis, drive gear configured to couple to the motor, and electromagnetic clutch configured to couple to the motor and coupled to the drive gear. The clutch engages first and second clutch plates responsive to being powered and disengages the clutch plates responsive to not being powered. Actuator includes a ball screw including a nut and a threaded shaft. The nut is coupled to the drive gear and rotation of the drive gear induces rotation of the nut about the reciprocation axis. Rotation of the nut induces motion of the threaded shaft along the reciprocation axis. Actuator includes a fluid damper having a piston coupled to the threaded shaft and disposed within a chamber containing a fluid. Piston includes a port that couples a first chamber portion to a second chamber portion. A brake assembly limits rotation of the nut responsive to the assembly being engaged.

An expansion valve operable by a stepper motor, the expansion valve including a housing; a hollow shaft arranged in the housing; a valve base that supports the hollow shaft and closes the housing; a rotor drivable by a stator of the stepper motor; a center spool arranged in the hollow shaft and drivable by the rotor so that a rotation of the center spool is transferrable by a threaded connection into an axial movement of the center spool that opens or closes the expansion valve; and a sleeve that includes a receiving portion that includes at least portions of the center spool, of a compression spring and of a force transmission element respectively and a valve needle, wherein the receiving portion of the sleeve element is closed by a bushing.