H11W不锈钢内螺纹止回阀工作原理：
内螺纹升降式止回阀的结构一般与截止阀相似，其阀瓣沿着通道中以线作升降运动，动作可靠，但流体阻力较大，适用于轻小口径的场合。内螺纹升降式止回阀一般只能安装在水平管路。
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