The basis of correct selection of valve electric device

Valve electric actuator is realized program control, automatic control and remote control of the indispensable equipment, its movement process can by travel, torque, or to control the size of the axial thrust. 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. The basis of correct selection of the valve electric actuator are as follows: 1, the operating torque operating torque is the most main parameter selection of valve electric actuator, electric actuator output torque should be valve operation maximum moment of 1. 2 to 1. 5 times. Host 2, operating thrust valve electric actuator structure has two kinds: one kind is not configured thrust plate, direct output torque; The other is a configuration thrust plate, the output torque by thrust plate stem nut into output thrust. 3, the output shaft rotational turns the valve electric actuator output shaft rotation circle the number of how many and nominal diameter of the valve, the valve stem thread pitch, thread, according to M = H/ZS computing ( M for electric devices should satisfy the total number of rotating ring, H is height of valve opens, S for stem drive screw pitch, Z for the stem thread) 。 4, the valve stem diameter for multi-turn rising stem valves, if electric device allows the largest 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 actuator must be greater than rising stem valves stem diameter. In parts of rotary valve and multi-turn valves 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, if the output speed of the valve opening and closing speed too fast, easy to produce water hammer. Therefore, should be used according to different conditions, choosing the proper opening and closing speed. Valve electric device has its own special requirements that must be able to limit torque and axial force. Valve electric device adopts usually limiting torque shafts. When the electric actuator specifications was determined, the control torque is determined. Generally run in a predetermined time, the motor will not overload. Electric gate valves, electric valve click into the product details