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閘閥
閘閥（gate valve）是一個啓閉件閘板，閘板的運動方向與流體方向相垂直，閘閥只能作全開和全關，不能作調節和節流。
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Start adding your projects to your portfolio. Click on "Manage Projects" to get started
閘閥（gate valve）是一個啓閉件閘板，閘板的運動方向與流體方向相垂直，閘閥只能作全開和全關，不能作調節和節流。