標気罐減圧弁
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標気罐減圧弁W21.8-14RH(F)の文字は何を意味していますか？外ねじはどの文字ですか？
40リットルのメタン用鋼製ボンベQF-30、QF-30Aなどで、ねじはW21.8-14LH（F）です。W21.8の外径はØ21.8mmで、1インチあたりの歯数は14歯です。14という数字はピッチが1.8142mmを意味し、LHはねじの回転方向を示しています。
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