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Faults and maintenance methods of common butterfly valves
Faults and solutions of common butterfly valves:
Possible failures:
Sealing surface leakage:
1. The butterfly plate and the sealing surface are clamped with foreign bodies.
2. The closing position of butterfly plate and sealing surface is not in good agreement.
3. The stress of flange bolts on the outlet side is uneven.
Elimination methods:
1. Eliminate impurities and clean valve chamber.
2. Adjust the adjusting screw of worm wheel or actuator so that the valve is in the correct closing position.
3. Inspection of flange plane and bolt tightening.
Leakage at both ends of butterfly valve:
1. Failure of sealing gaskets on both sides.
2. Non-uniform or non-tightening of pipe flange.
3. Failure of upper and lower gaskets of sealing rings.
Solutions:
1. Replace the sealing gasket.
2. Compress flange bolts.
3. Remove the pressure ring of the valve, replace the sealing ring and invalidate the gasket.
The butterfly valve can be divided into offset plate, vertical plate, inclined plate and lever type according to its structure. According to the sealing form, it can be divided into soft sealing type and hard sealing type. Soft seal type is usually rubber ring seal, hard seal type is usually metal ring seal. According to the connection form, it can be divided into flange connection and clip Lina sister. According to the rotation mode, it can be divided into manual, gear transmission, pneumatic, electric and hydraulic.