Pneumatic ball valves sometimes experience internal leaks. The following are some causes of internal leakage and their common treatment methods: The zero position of the pneumatic ball valve actuator is not set, and the valve has not reached the fully closed position. How to adjust: Close the valve manually (make sure it is fully closed) and close the valve manually. Push on the side that is a little hard to screw in, then return it half a turn (valve open direction). Then adjust the valve.
Selection of stroke pneumatic ball valve: the valve rotates 90° to open and close. The actuator torque is insufficient to easily reach the fully closed position without pressure. Unable to suppress rotational force and liquid, no thrust. Treatment method: switch to a larger thrust actuator or switch to a balanced spool to reduce the uneven force on the medium.
Pneumatic ball valve internal leakage due to manufacturing quality: the manufacturer did not strictly control the valve material, processing technology, assembly process, etc. during the manufacturing process, resulting in unqualified sealing surface grinding. Eliminates internal leaks in pneumatic ball valves. Treatment method: Reprocess the sealing surface. Pneumatic ball valves control internal leakage that locally affects the valve.
The conventional control methods of pneumatic ball valves include valve limit switches, over-torque switches and other mechanical control methods. These control elements are affected by ambient temperature, pressure and humidity, resulting in incorrect valve positioning and spring fatigue. Objective factors such as uneven thermal shrinkage coefficient will lead to internal leakage of pneumatic ball valves. What to do: Readjust the limit.
