Common faults of high-performance butterfly valves and their causes

Common faults and causes of butterfly valves

Before installation, confirm whether the performance of the product and the arrow of the medium flow direction are consistent with the movement conditions, and the inner cavity of the valve is inserted and cleaned. No foreign matter attached to the sealing ring and butterfly plate is allowed, and the butterfly plate is never allowed to be closed before cleaning. , So as not to damage the sealing ring.

1. Leakage of sealing surface

1. There are sundries on the butterfly plate and sealing surface

2. The closing position of the butterfly plate and the sealing surface is not correct

3. The outlet side is equipped with flange bolts that are unevenly stressed or not according to the requirements of Figure 1.

4. The direction of the pressure test is not in accordance with the requirements of Figure 1

Solution:

1. Remove impurities and clean the inner cavity of the valve

2. Adjust the adjusting screw of the worm gear or electric actuator to achieve the correct closing position of the valve

3. Check the mounting flange plane and bolt compaction country, which should be evenly compacted

4. Press in the direction of the tip seal

2. Leakage on both ends of the valve

1. The sealing gaskets on both sides fail

2. The pipe flange is unevenly tightened or not pressed tightly

3. The upper and lower gaskets of the sealing ring are invalid

Solution:

1. Replace the sealing gasket

2. Tighten the flange bolts (uniform force)

3. Remove the pressure ring of the valve, replace the sealing ring, and the failed gasket

3. Leakage of sealing surface

1. There are sundries on the butterfly plate and sealing surface

2. The closing position of the butterfly plate and the sealing surface is not correct

3. The outlet side is equipped with flange bolts that are unevenly stressed or not according to the requirements of Figure 1.

4. The direction of the pressure test is not in accordance with the requirements of Figure 1

Solution:

1. Remove impurities and clean the inner cavity of the valve

2. Adjust the adjusting screw of the worm gear or electric actuator to achieve the correct closing position of the valve

3. Check the mounting flange plane and bolt compaction country, which should be evenly compacted

4. Press in the direction of the tip seal

4. Leakage on both ends of the valve

1. The sealing gaskets on both sides fail

2. The pipe flange is unevenly tightened or not pressed tightly

3. The upper and lower gaskets of the sealing ring are invalid

Solution:

1. Replace the sealing gasket

2. Tighten the flange bolts (uniform force)

3. Remove the pressure ring of the valve, replace the sealing ring, and the failed gasket