Abstract:In order to improve the detection accuracy and precision of valve sealing,the disadvantage of traditional test methods was analyzed,and a new valve sealing testing method based on gas sensor was proposed.This detection method used 4% hydrogen and 96% nitrogen mixed gas as the detection of gas,used the measured difference of gas concentration in detection unit to calculate the leakage,then determined the sealing performance of the workpiece.This method can eliminate the effect on the detection results by the factors such as time,temperature and pipeline capacity,the accuracy and speed of test is improved.