This turning force in a butterfly valve is determined by three factors. Friction of the disc to seat for sealing; Bearing friction; Dynamic torque.

• 这种位于蝶阀内的旋转力由三个因素决定:(1)蝶板与阀座发生密封时的摩擦力;(2)轴承摩擦力;(3)动态扭矩。