Overview of Motorized Butterfly Valve

The motorized butterfly valve relies on the motor of the motorized actuator to drive the valve shaft of the butterfly valve to rotate, and the valve shaft drives the butterfly plate to rotate 90° to open and close the valve. It can be used to cut off and adjust the flow. The motorized actuator of the motorized butterfly valve is equipped with a limit switch, which can automatically cut off the circuit when the limit is reached. At the same time, to ensure the safety of the project, the motorized butterfly valve is equipped with an electric overload protection device and a signal light indicator.

There are generally the following types of faults and treatment methods for motorized butterfly valves:

Fault 1: Leakage at the packing of the motorized butterfly valve

Cause analysis:

① The packing is seriously aged;

② The gland bolts are not tightened or loose;

Solution:

① Replace the new packing;

② Tighten the gland bolts evenly;

Fault 2: Leakage at the end cover

Cause analysis:

① The bolts are not tightened;

② The O-ring is damaged;

Solution:

① Check whether the bolts are loose and tighten them;

② Replace the new O-ring;

Fault 3: Leakage on the sealing surface

Cause analysis:

① The butterfly plate is not closed in place;

② The sealing surface is dirty, resulting in poor closure;

③ The sealing surface is damaged;

Solution:

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

② Clean the dirt accumulated on the sealing surface ;

③Repair the damaged sealing surface;

Fault 4: The motorized device is not flexible, causing the valve to fail to open and close normally

Cause analysis:

① The packing is pressed too tightly;

② The packing gland is not tightened in place and tilts;

③ The transition device is damaged;

Solution:

① Do not press the packing gland too tightly, loosen it appropriately;

② Correct the verticality of the packing gland;

③ Replace a new transition device;

Fault 5: The motor does not stop or the opening and closing are incomplete after the opening and closing are completed

Cause analysis:

① The limit switch fails or the overload protection device is inaccurate;

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

Solution:

① Replace the limit switch or adjust the overload device to ensure accuracy;

② Adjust the reaction speed of the limit switch;