Upon pressure testing, if leakage is found at the rear end of valve, first of all, pressure has to be released, then, union shall be rotated 1/4 round with wrench to stop leakage.

• 在试压测试时在阀门的后端假如有任何的泄露，应先泄压后再使用板手将大壳转1/4圈去止漏。