union wrench 中文意思是什麼
union wrench
解釋
管接頭扳手-
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
在試壓測試時在閥門的後端假如有任何的泄露,應先泄壓后再使用板手將大殼轉1 / 4圈去止漏。
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