Common Problems and Handling of Electric Butterfly Valves

The electric butterfly valve relies on the motor of the electric actuator to drive the butterfly valve's shaft to rotate, which in turn drives the butterfly plate to rotate by 90° to open and close the valve, which can be used to cut off and regulate the flow. The electric actuator of the electric butterfly valve is equipped with a limit switch, which can automatically cut off the circuit when the limit is reached, and the electric butterfly valve is equipped with a power overload protection device and a signal light indication in order to protect the engineering safety.

The electric butterfly valve failure and handling methods are generally the following：

Fault 1 electric butterfly valve valve packing at the external leakage

Cause analysis:

①Serious aging of packing.

② the gland bolts are not tightened or are loose.

Solution:

①Replace the packing with new one.

②Tighten the gland bolts evenly.

Fault 2 Leakage at the end cover

Cause analysis:

① Bolts are not tightened.

② damage to the O-ring.

Solution:

① Check if the bolt is loose and tighten it.

② Replace the 0-ring with a new one.

Fault 3 Leakage occurs on the sealing surface

Analysis of causes:

① Butterfly plate not closed in place.

②Dirt accumulates on the sealing surface, resulting in poor closure.

③ Damage to the sealing surface.

Solution:

①Adjust the screws on the electric actuator of the electric butterfly valve to close the butterfly plate in place.

②Clean the accumulated dirt on the sealing surface.

③ Repair the damaged sealing surface.

Fault 4 The electric device does not operate flexibly, resulting in the valve not opening and closing normally

Cause analysis:

① the packing is pressed too tightly.

②The gland of the packing is not fastened in place and is tilted

③ Transition device failure damage.

Solution:

① Do not press the packing gland too tightly, relax it appropriately.

② Correct the verticality of the packing gland.

③ Replace the transition device with a new one.

Fault 5 opening and closing to the head of the motor did not stop or opening and closing incomplete

Cause analysis:

① the limit switch is out of order or the overload protection device is not allowed.

②The limit switch acts too early or reacts too late.

Solution:

① Replace the limit switch or make adjustments to the overload device to ensure accuracy.

② adjust the response speed of the limit switch.