Choice of electric butterfly valve

Stem diameter: open stem valve for multiple turns.It cannot be assembled into an electric valve.Therefore, if the maximum stem diameter allowed by the electric butterfly device does not pass through the stem of the supplied valve.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 valve.For local rotary valve and multi-rotary valve in the dark stem valve, although do not consider the diameter of the stem through the problem, but in the selection should also consider the diameter of the stem and keyway size, so that the assembly can work normally.

Operating moment: The most important parameter of choosing the valve electric device is operating moment.Electric butterfly valve movement process can be controlled by the stroke, torque or axial thrust size.Because the working characteristics and utilization of the valve electric device depends on the type of valve, device work specification and valve position in the pipeline or equipment, the valve electric butterfly valve device is to realize the valve program control, automatic control and remote control is indispensable equipment.Therefore, the correct choice of valve electric device, to prevent overload phenomenon (working torque is higher than the control torque) is crucial.In general, the correct choice of valve electric butterfly valve device basis.

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

Electric butterfly valve operating thrust: the main engine structure of the valve electric device has two kinds: one is not equipped with a thrust disk.The output torque is converted to thrust through the stem nut in the thrust tray.Direct output torque;The other is to configure the thrust disk.

Number of turns of output shaft: the number of turns of output shaft of valve electric device is related to the nominal size of valve, stem pitch and number of threads.H is the opening height of the valve, which should be calculated according to M=HZS (M is the total number of turns that the electric device should meet.S is the pitch of stem drive thread, Z is the number of stem threads.