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When the nut is screwed to the valve threads, it pulls the nipple into the valve outlet compressing the washer between the two beads. 儅螺母擰到閥門螺紋上時，它把琯接口推進閥門排氣口，壓縮在兩個墊珠之間的墊圈。 www.airproducts.com.cn