往復真空ポンプの吸排気バルブの問題
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なぜ往復式真空ポンプの排気バルブ用スプリングは吸気バルブ用スプリングより太いのでしょうか？
出口のバネの弾性係数は大きく、開放圧力の要求値に達しやすい。往復式の圧力出口では入口の圧力よりも高く、一定の圧力に圧縮されて初めて開放される。つまり、排気圧力がバネの弾力に達した時にのみ排気弁が開くのである！
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