The butterfly valve is normally 90 ° from fully open to fully closed? The butterfly valve is simple in structure, small in size and light in weight, and only consists of a few parts. And it can be quickly opened and closed only by rotating 90 °, which is simple to operate? The opening and closing parts of the gate valve are the gate, and the movement direction of the gate is perpendicular to the fluid direction. The gate valve can only be fully opened and fully closed?,? Adjustment and throttling are not allowed. The gate has two sealing surfaces. The advantages of the gate valve are: small fluid resistance, less effort in opening and closing, unrestricted medium flow direction, no flow disturbance and no pressure reduction

In addition, when the elbow is installed at the inlet side of the pneumatic butterfly valve, bias flow will be formed, resulting in an increase in torque. When the valve is in the middle opening, the operating mechanism needs to be self-locking due to the action of the hydrodynamic moment.