彈簧力把先導孔關(guān)閉，入口壓力通過旁通孔迅速腔室在關(guān)閥件周圍形成下低上高的壓差，流體壓力推動關(guān)閉件向下移動，關(guān)閉閥門。
特點： 流體壓力范圍上限較高，可任意安裝（需定制）但必須滿足流體壓差條件。

：蔡韻
一八七七一零二二八二九

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