Electric ball valves sometimes show internal leakage, and the following are several reasons for internal leakage and their common treatment methods. The zero position of the electric ball valve actuator is not set and does not reach the full closing position of the valve. Adjustment method: manually close the valve (need to confirm that it has been completely closed), and then manually close the valve, which shall prevail if it cannot be twisted with a little force; Then twist back (in the direction of opening the valve) half a turn; Then adjust the limit.

The choice of the stroke mode of the electric ball valve: the valve is rotated 90° opening and closing, the torque force of the actuator is not large enough, and it is easy to reach the full closing position when there is no pressure, and when there is a rotating force, the thrust of the liquid propulsion cannot be restrained, so the closing is not in place. Solution: Replace the actuator with high thrust, or change to a balanced spool to reduce the unbalanced force of the medium.

Internal leakage caused by the manufacturing quality of electric ball valves: the manufacturer does not strictly control the valve material, processing technology, and assembly process in the consumption process, resulting in unqualified sealing surface grinding, pitting, trachoma and other defective products are not removed, resulting in the internal leakage of electric forged steel ball valves. Treatment: Rework the sealing surface. Electric ball valves control internal leakage that affects the valve locally.

The traditional control mode of electric ball valve is through the valve limit switch, torque switch and other mechanical control mode, because these control elements are affected by the ambient temperature, pressure, humidity, the formation of valve positioning inaccuracy, spring fatigue, uneven thermal shrinkage coefficient and other objective elements, the formation of electric forged steel ball valve leakage. Solution: Readjust the limit.