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Butterfly valve fully open to fully closed is usually less than 90° , butterfly valve and butterfly stem itself has no self-locking ability, in order to position the butterfly plate, a worm gear reducer is added to the stem.

The use of this valve can improve the closing sealing performance of the conveying pipeline system and eliminate leakage to the maximum extent.

This water flow velocity and pressure with the time and position and the change of the phenomenon, known as water hammer (or water strike).