Electric ball valves sometimes show internal leakage. Let's talk about several reasons for internal leakage and their common treatment methods. The zero position of the electric ball valve actuator is not set, and it has not reached the fully closed position of the valve. Adjustment method : manually close the valve (must confirm that it has been completely closed), then manually close the valve harder, whichever is slightly harder to screw it, and then turn it back (open valve direction) half a turn; then adjust the limit.
The selection of the stroke mode of the electric ball valve: the valve is opened and closed by rotating 90°, and the torque of the actuator is not large enough. It is easy to reach the fully closed position when there is no pressure. When there is rotating force, the thrust of liquid propulsion cannot be restrained., So the closure is not in place. Treatment method: change to a large thrust actuator, or change to a balanced spool to reduce the uneven force of the medium.
Internal leakage caused by the manufacturing quality of electric ball valves: The valve manufacturers do not strictly control the valve material, processing technology, assembly technology, etc. during the production process, resulting in unqualified sealing surface, and failure to eliminate defective products such as pitting and trachoma. The internal leakage of the electric forged steel ball valve is eliminated. Treatment method: reprocess the sealing surface. The electric ball valve controls the internal leakage that locally affects the valve.
The traditional control method of electric ball valve is through mechanical control methods such as valve limit switch and over-torque switch. Because these control elements are affected by the environmental temperature, pressure, and humidity, the valve positioning is inaccurate, the spring is tired , and the thermal contraction coefficient is uneven. And other objective elements, forming the internal leakage of the electric forged steel ball valve. Treatment method: readjust the limit.
