Common quarter-switch ball valves are manually operated utilizing a handle. For actuation, some ball valves aspect a mounting pad in the housing for immediate mounting to a pneumatic or electric actuator. บริษัท สมหวังทรัพย์ เอ็นจิเนียริ่ง จำกัด Sirca pneumatic actuator from Europe import to Thailand, started its action as maker of finish https://andersoniovvx.dgbloggers.com/17292073/pneumatic-actuator-types-fundamentals-explained