5. Classification by operating temperature
(1) High temperature butterfly valve. Butterfly valve with t<450 ℃.
(2) Medium temperature butterfly valve. 120℃
(3) Normal temperature butterfly valve- 40℃
(4) Low temperature butterfly valve- 100℃
(5) Ultra low temperature butterfly valve. Butterfly valve with t ≤ - 100 ℃.

If the wafer type pneumatic butterfly valve can not reverse normally under the rated voltage, check whether the connector (plug) of the solenoid coil is loose or not in contact. The method is to unplug the plug and measure the resistance of the coil. If the resistance is too large or too small, the solenoid coil is damaged and should be replaced.