The selection rules of butterfly valve

     The selection rules

     Stem diameter: bright bar on multi turn valves. It can not be assembled into electric valve. Therefore, if the electric butterfly valve device allows the maximum stem diameter can not bedispensed through the valve stem. The electric device hollow output shaft diameter must be greater than specified under the valve stemdiameter. On the local rotary valve and multi turn valves in the dark bar valve, though not considered by the stem diameter, but alsoshould fully consider the matching stem diameter and keyway size,so that work can be assembled.

     Operating torque: torque operation is to select the main parametersof valve electric device. Electric butterfly valve movement can be stroke, torque or to control the size of the axial thrust. Because the position standard device and valve type, valve actuators of the operating characteristics and utilization depends on the valve in the pipeline or equipment, electric valve butterfly valve device is programmed to achieve the valve, automatic control and remote control devices indispensable. 

      Therefore, the correct choice of electric valve actuators, to prevent overload of the phenomenon(torque is higher than that of control torque) is essential. Typically,the correct choice of electric valve butterfly valve device based on.

Electric device output torque should be 1.2-1.5 times the maximum torque valve operation.

Transmission chain

     Electric butterfly valve operating thrust: the structure of main valve electric device has two kinds: one is not configured thrust plate.The output torque is converted to the output thrust through the thrust plate of the stem nut. The direct output torque; the other is configured thrust plate.

     Output: output shaft rotation number of valve electric device shaftrotation number and valve nominal diameter, pitch, thread numberof stem. H is the valve opening height, according to the calculation of M=HZS (M for the electric device shall meet the total rotation number. S for the stem drive screw thread, Z for the stem thread number.

     Chinabase is able to offer custom, cost-optimized solutions in accordance with customer drawings - such as ready-to-install machine parts and profiles - in addition to our standard products. Our internal Application Technology department and field staff are happy to provide free advice on custom solutions.

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