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Selection Rules
May 24, 2017

The selection rules are explained in the following ways:

Stem diameter: For many rotary type of clear rod valve, can not be assembled into electric valve. Therefore, if the maximum stem diameter of the electric butterfly valve is not passed through the valve stem of the valve, the inner diameter of the hollow output shaft of the electric device must be greater than that of the valve stem of the clear rod valve. For the local rotary valve and many rotary valve in the dark rod valve, although not to consider the valve stem diameter through the problem, but in the selection should also fully consider the stem diameter and keyway size, so that the assembly can work properly.

Operation Torque: The operation torque is the main parameter of selecting the valve electric device. The motion process of the electric butterfly valve can be controlled by the size of the stroke, torque or axial thrust. Because of the operating characteristics and utilization of the valve electric device depends on the type of valve, working standard and the position of the valve in the pipeline or equipment, the valve electric butterfly valve device is realizes the valve program control, self-control and the remote control indispensable equipment. Therefore, the correct choice of the valve electric device, to prevent the overload phenomenon (working torque is higher than the control torque) is essential. Usually, this is the correct choice valve electric butterfly valve installment basis.

The output torque of the electric device shall be 1.2-1.5 times times the maximum torque of the valve operation.

Electric Butterfly valve Operation Thrust: The main structure of the valve electric device has two kinds: one is to configure the thrust disk, the output torque is converted to the output thrust through the valve stem nut in the thrust disk, and the direct output moment is not configured.

Output shaft Rotation Number: The number of the output axis of the valve electric device is related to the nominal diameter of the valve, the pitch of stem and the number of thread. To press M Hizs (h for the valve to open the height, m for the electric device should meet the total number of rotating rings, s for the stem drive thread pitch, z for the stem Thread head number) calculation.