Problems Existing in the Use of Multi-level Butterfly Valve
Multi-level hard seal butterfly valve for the eccentric metal seal structure, sealing form for metal to metal seal, can replace the metal seal ring to metal seal, stainless steel plate and graphite composite plate sealing ring to metal seal. Hard seal butterfly valves are divided into electric multi-level butterfly valves, worm multi-level butterfly valves, pneumatic multi-level butterfly valves, etc. The following is a multi-level butterfly valve in the use of the common problems.
1., because the multi-layer soft and hard stacked sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium forms a positive scour on its sealing surface, and the soft sealing band in the metal sheet sandwich directly affects the sealing performance after being scoured.
2. limited by the structural conditions of the structure is not suitable to do the following diameter DN200 valve, the reason is that the overall structure of the valve plate is too thick, flow resistance.
3., due to the principle of three eccentric structure, the sealing surface of the valve plate and the valve seat are sealed between the valve plate and the valve seat by the torque of the transmission device. In the positive flow state, the higher the medium pressure, the tighter the seal extrusion. When the channel medium backflow with the increase of the medium pressure between the valve plate and the valve seat unit positive pressure is less than the medium pressure, the seal began to leak.
For more information, consult Henan Shangvalving manager 13703820603/15551530000