At present, the butterfly valve, as a component to realize the on-off and flow control of the pipeline system, has been widely used in many fields, such as petroleum, chemical industry, metallurgy, hydropower and so ...
In the daily use of the valve, often encounter a variety of faults, valve leakage is one of the most common faults, and valve leakage generally have two cases of internal leakage and external leakage! So...