Selection Principle of Electric Butterfly Valve
The maximum stem diameter allowed by the electric butterfly valve device cannot pass through the stem of the equipped valve. Stem diameter: for multi-turn type rising stem valves. It cannot be assembled into an electric valve. Therefore, the inner diameter of the hollow output shaft of the electric device must be larger than the outer diameter of the stem of the rising stem valve. For partial-turn valves and dark-stem valves in multi-turn valves, although there is no need to consider the passage of the stem diameter, the stem diameter and the size of the keyway should also be fully considered when selecting, so that it can work normally after assembly.
The valve electric butterfly valve device is an indispensable equipment for realizing valve program control, automatic control and remote control. Operating torque: operating torque is the most important parameter for selecting valve electric devices. The movement process of the electric butterfly valve can be controlled by the stroke, torque or axial thrust. Since the working characteristics and utilization of the valve electric device depend on the type of valve, the working specifications and the position of the valve on the pipeline or equipment, the correct selection of the valve electric device can prevent overload (Working torque is higher than control torque) is very important. Usually, the correct choice of valve electric butterfly valve device is the basis.
