The rational choice of valve electric device
1, operating torque: operating torque is to select the main parameters of valve electric device. Electric actuator output torque should be 1 valve operating torque. 2 to 1. 5 times. 2, operating thrust: there are two kinds of valve electric device of the host structure, one kind is not configured thrust plate, the direct output torque; Another is to configure the thrust plate, the output torque by thrust plate stem nut can be converted into output thrust. 3, output shaft rotation ring count: the number of laps valve electric actuator output shaft rotation with nominal diameter of the valve, the valve stem thread pitch, thread, calculated at M = H/ZS ( Type: M for electric devices should satisfy the total number of rotating ring; H for the valve opening, mm; S for the stem drive screw pitch, mm; Z to stem thread. ) 4, stem diameter, for rising stem valves multi-turn class, if electric device allows stem diameter can't through the stem of the valve, cannot assemble into electric valve. As a result, the inner diameter of the hollow output shaft electric device than rising stem valves stem diameter. For part of the rotary valve and multi-turn valves of non-rising stem valves, although need not consider stem diameter through the problem, but also should fully consider when selecting the valve stem diameter and the size of the keyway, after assembly to work properly. 5 and the output rotational speed, the valve opening and closing speed, easy to produce water hammer. Therefore, we should according to the different conditions of use, select the appropriate opening and closing speed. 6, installation, connection mode: the installation of electric way have installed vertical, horizontal, fall to the ground; Connection mode is: the thrust plate; Stem through ( Rising stem multi-turn valves) ; Non-rising stem multi-turn; No thrust plate; The valve stem not through; Part of the rotary electric actuator USES is very wide, is the realization of program-controlled valve, automatic control and remote control of the indispensable equipment, its main use on the closed valve.