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Common Faults and Maintenance Methods of Electric Soft-sealed Butterfly Valves

  • 2021-05-04 16:31

The electric soft sealing butterfly valve relies on the motor of the valves.com/a/PRODCUTS/Butterfly_Valve/2021/0419/15.html' target='_blank'>electric actuator to drive the valve shaft of the butterfly valve to rotate, and the valve shaft drives the butterfly plate to rotate 90° to realize the opening and closing of the valve. It can be used for cutting off and adjusting the flow. The valves.com/a/PRODCUTS/Butterfly_Valve/2021/0419/15.html' target='_blank'>electric actuator of the electric soft-sealed butterfly valve is equipped with a limit end limit switch, which can automatically cut off the circuit at the end. At the same time, in order to ensure engineering safety, the electric soft-sealed butterfly valve is equipped with an electric overload protection device and a signal lamp. The faults and treatment methods of electric soft-sealed butterfly valves are generally as follows:
 

Fault 1. Leakage at the valve packing

Reason:
1. The packing is seriously aging.
2. The gland bolts are not tightened or loose.

 

Solution:
1. Replace with new packing.
2. Tighten the gland bolts evenly.

 

Fault 2. Leakage in the end cover

Reason:
1. The bolt is not tightened.
2. The O-ring is damaged.

 

Solution:
1. Check whether the bolt is loose and tighten it.
2. Replace with a new O-ring.

 

Fault 3. Leakage on the sealing surface

Reason:
1. The butterfly board is not closed properly.
2. Dirt accumulates on the sealing surface, resulting in lax closing. 3. The sealing surface is damaged.

 

Solution:
1. Adjust the screws on the electric actuator of the electric butterfly valve to close the butterfly plate in place.
2. Clean up the accumulated dirt on the sealing surface.
3. Repair the damaged sealing surface.

 

Fault 4. The inflexible operation of the electric device causes the valve to fail to open and close normally

Reason:
1. The packing pressure is too tight.
2. The gland of the packing is not fastened in place and is inclined. 3. Excessive device failure and damage.

 

Solution:
1. Don't press the packing gland too tightly, and loosen it appropriately.
2. Correct the verticality of the packing gland.
3. Replace with a new transition device.

 

Fault 5. The motor has not stopped or the opening and closing is incomplete.

Reason:
1. The limit switch is out of order or the overload protection device is inaccurate.
2. The limit switch action is too early or the response is too late.

 

 Solution:
1. Replace the limit switch or adjust the overload device to ensure accuracy.
2. Adjust the response speed of the limit switch.

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