Common resilient seated butterfly valves are made mainly for fluid isolation as they have got very poor control properties. The seat is really an elastic single piece that retains in place the valve overall body. This style might have its integrity compromised Should the valve is held partially open. บทความเครื่องจักรกลการเกษตรและอะไหล่ https://floweter43197.sharebyblog.com/15834447/5-easy-facts-about-electric-actuator-described