An electric actuator includes a housing, an electric driving unit, an selector member being rotatable about a rotation axis and moving in a direction of the rotation axis, a position holding member and detection object provided in the selector member, a detector, an engagement groove provided on a cooperation surface inside the housing, and a biasing member biasing the selector member in the direction of the rotation axis to make the position holding member approach the cooperation surface. The engagement groove is formed so that the detection object is positioned in one of a detectable area and an undetectable area when the position holding member is engaged with the engagement groove, and the detector is configured to switch between supply and cutoff of power to the electric driving unit in accordance with whether or not the detection object is detected.

A regulating flap, especially exhaust flap for the exhaust gas stream of an internal combustion engine, includes a flap body (12), a flap diaphragm (16) carried on a pivot shaft (14) that is rotatable about a pivot axis (S) in the interior of the flap body (12). A pivot drive (20) has a drive element (30) to be coupled with the pivot shaft (14). A fixing device (40) fixes the pivot drive (20) in relation to the flap body (12). The fixing device (40) includes a bayonet fastener (38).

An automatic valve actuator unit and method for use with an associated manual shutoff valve configured to permit or restrict the flow of fluid through an associated supply pipe. The unit comprises a housing, an attachment mechanism for securing the housing to at least one of the associated supply pipe or manual shutoff valve, and an actuator at least partially supported in the housing and having an output shaft extending from the housing. The output shaft includes a locating member supported at a distal end thereof for non-rotatingly engaging a surface of a valve handle of the associated manual shutoff valve adjacent a point of attachment of the handle to the associated manual shutoff valve, the locating member configured to center the output shaft over an axis of rotation of the handle of the associated manual shutoff valve.

A method of calibrating a choke system includes connecting to the positioner an electronic controller which is programmed to output a control signal representing the desired position of the plug, connecting to the electronic controller a flowmeter which is configured to provide a flow signal representing the rate of flow of fluid from the pump to the inlet and a pressure sensor which is configured to provide a pressure signal representing the fluid pressure at the inlet, connecting the inlet to a reservoir of fluid via a pump which is operable to pump fluid from the reservoir into the inlet at varying flow rates, and using gain scheduling to determine optimum values of proportional gain and integral gain required for control of the choke using a proportional differential and integral controller at a plurality of different rates of flow of fluid along the central flow passage.

The present invention relates to an emergency control device for a spring return valve actuator, the device including: a power source unit for receiving an alternating current (AC) power source, converting and stepping down an AC voltage of the received AC power source to a given direct current (DC) voltage, and supplying the DC voltage, and transmitting a signal as to whether the power source is supplied; a charge unit for receiving the DC voltage from the power source unit to store electrical energy with a given voltage; and a control unit for receiving the DC voltage from the power source unit to supply the received DC voltage to the electromagnetic brake, and if a power source cutoff signal is received from the power source unit, for supplying the electrical energy stored in the charge unit to the electromagnetic brake for a given set time.

A valve operating machine includes a base having a housing thereon. A motor, and a planetary gearbox are mounted within cavities in the housing. A motor gear, a planetary input gear and an idler gear are mounted within a separate cavity. The motor gear is mounted for rotation with a motor shaft of the motor and the planetary input gear is mounted for rotation with a planetary gear spindle of the planetary input gear. The idler gear is engaged with the motor and planetary input gears. An output socket is connected to the planetary gearbox for connection to a key that is used to exercise a valve.

A leak detection and response system includes a valve assembly with a housing defining an internal passageway. The valve assembly includes an internal inlet port, an internal outlet port, a valve port assembly, an external inlet port, and an external outlet port each in fluid communication with the internal passageway. The valve assembly includes a first sensor port disposed either between the external outlet port and the internal inlet port, or between the external inlet port and the internal outlet port. The valve assembly includes a first leak sensor positioned in the first sensor port for generating a signal indicating a presence of water. The valve assembly includes a controller configured to receive the signal from the first leak sensor, and control the valve assembly to align the valve port assembly to block water flow from the external inlet port.

A building management system is configured to modify an environmental condition of a building. The building management system includes a valve assembly, an actuator device, and a network sensor device. The actuator device includes a motor, a drive device driven by the motor and coupled to the valve assembly, and a controller coupled to the motor. The controller includes a microprocessor and a control application configured to enable closed loop control of the valve assembly. The network sensor device is communicably coupled to the actuator device and configured to measure an environmental property. The control application is configured to perform the closed loop control of the valve assembly based on an input control signal from a mobile device and the measured environmental property from the network sensor device.

A ball valve includes a ball that has a passage hole and is rotatably supported, a ball packing that is made of polyimide and is in contact with an outer circumferential face of the ball, and a ball retainer that holds the ball packing, and a spring-loaded lip seal that is installed between the ball packing and the ball retainer and has a metallic spring fit inside a seal case made of a resin.

A system including a valve positioned in a conduit, wherein the valve is configured to change fluid flow through the conduit. The system includes an actuator having a motor that is configured to selectively rotate the valve toward a desired valve orientation. The system is configured to receive a request for a desired valve orientation, control the motor to move the valve into the desired valve orientation, and sense a condition corresponding to a current valve orientation following movement by the motor. The system is configured to determine if the sensed condition indicates that the current valve orientation matches the desired valve orientation from the request, and, responsive to determining that the current valve orientation does not match the desired valve orientation from the request, control the motor to selectively rotate the valve in a direction to move the valve towards the desired valve orientation.