Description of the problems existing in the use of the vacuum butterfly valve

1. Because the multi-layer soft and hard stack sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium forms a frontal flush on the sealing surface thereof, and the soft sealing band in the metal sheet interlayer is directly washed, which directly affects the sealing performance.

2. Limited by structural conditions The structure is not suitable for valves with a diameter below DN200. The reason is that the overall structure of the valve plate is too thick and the flow resistance is large.

3. Due to the principle of the rubber-lined butterfly valve, the seal between the sealing surface of the valve plate and the valve seat is pressed against the valve seat by the torque of the transmission device. In the case of a positive flow condition, the higher the medium pressure, the tighter the sealing kneading. When the flow medium is reversed, the pressure of the medium increases, and the unit positive pressure between the valve plate and the valve seat is smaller than the medium pressure, and the seal opening leaks.