A. Butterfly valves do not used gland packings and thus spindle doesn’t have anything to keep it in position and can open by vibration B. Butterfly valve does have a spindle packing but same cannot be excessively tightened to have good grip on the spindle to prevent it from opening against vibration C. Butterfly valves can move by vibration but that is not the main consideration, the main consideration being opening/closing against liquid pressure D. All the butterfly valves do not have locking arrangement as there is no such requirement for the same « Previous Next »
Post a Comment