电气类外文翻译---扭矩过载保护器.doc

电气类外文翻译---扭矩过载保护器
Torque overload protection
Valve electric device is used to operate the valve and was one of the valves connected to the device. The device is driven by electricity, their motion process can be stroke, torque, or to control the size of the axial thrust. As the valve should be the work of electrical device characteristics and utilization depend on the type of valves, fittings and valves regulate the work of the pipeline or equipment location. Therefore, control valve electric device the right choice; consider the prevention of overload (working torque higher than the control torque) has e essential to the occurrence of a ring.
Valve electric device right choice should be based on: 1. Operation torque: Operation torque is to select the main valve electrical device parameters. The output torque electric actuator valve operation should be the greatest moment of ~ times. 2. Operation Thrust: the host structure ofMOTORIZED VALVE ACTUATOR the valve electric device, there are two, one is not configured thrust plate, this time directly to the output torque; the other is equipped with thrust plate, and this time the output torque of the valve stem through the thrust disk nut is converted to the output thrust. 3. Number of output shaft rotation circle: valve electric actuator output shaft rotation the number of laps and the valve nominal diameter, stem pitch, thread the first few related, according to M = H / puting (where: M for
the electrical installations should be to meet the total number of rotating ring; H of the valve opening height, mm; S to stem transmission thread pitch, mm; Z to stem the number of screw heads.) 4. Stem Diameter: For multi-turn type valves for the next shot, if the electric actuator allows the maximum stem diameter of the valve stem can not be dispensed, it can not be assembled into electric valve. Therefore, the electrical device hollow output shaft diameter must be greater than specified under the valve stem diamet