Stem diameter: rising stem valves for multi-turn class. Cannot assemble into electric valve. Therefore, if the electric butterfly valve device allows the largest stem diameter can't through the stem of the valve. The inner diameter of the hollow output shaft electric actuator must outweigh the rising stem valves stem diameter. In local rotary valve and multi-turn valves non-rising stem valves, although need not consider stem diameter through the problem, but should also be abundant consider when selecting the valve stem diameter and the size of the keyway, after assembly to work properly. Operating torque: operating torque is the most main parameter selection of valve electric actuator. Electric butterfly valve movement process can be made of the trip or the size of the axial thrust and torque control. Due to the working characteristic of valve electric device and work efficiency depends on the type of valve, the device specification and the position of the valve in the pipeline or equipment, electric butterfly valve device is programmable valve, control Industrial Valves and remote control of the indispensable equipment. Therefore, the correct selection of valve electric device, to prevent overload phenomenon, Work torque is higher than the control torque) Is of crucial importance. Usually, the basis of correct selection of valve electric butterfly valve. electric actuator output torque should be operating maximum moment of 1. 21. 5 times. Electric butterfly valve operating thrust: the host structure of valve electric device has two kinds: one kind is not configured thrust plate. Output torque by thrust plate of stem nut can be converted into output thrust. Direct output torque; The other is a configuration thrust plate. Output shaft rotation circle count: the number of laps valve electric actuator output shaft rotation with nominal size of the valve, the valve stem thread pitch, thread. H is height of valve opens, according to M = HZS computing ( M for electric devices should satisfy the total number of rotating ring. S for the stem drive screw pitch, Z for stem thread.
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