Quantification of Internal Air Leakage in Ball Valve using Acoustic Emission Signals

A relationship between internal leakage rate, acoustic emission (AE) signals and other factors is proposed to calculate internal leakage rate through valves. Firstly, ASL value of AE data, inner leakage rate, valve size and pressure were collected for valve under two typical leakage conditions including tiny open ing and sealing damage. Secondly, stepwise regression analysis and partial least square method were used to process AE data and then two empirical models co ncerning the quantification of internal leakage rate through valve were gained. Results sho w that the average prediction error of leakage rate calculation model is less than 10% in certain conditions, which is feasible in rapidly predict air internal leakage rate in ball valve.