旋启式止回阀是工业管线中应用极为广泛的自动阀门，其公称尺寸通常覆盖DN 50至DN 750的大口径范围。与升降式止回阀不同，旋启式止回阀采用内装摇臂旋启式结构，启闭件（阀瓣）像一扇门一样，依靠介质流动的力量绕轴旋转，自行开启或关闭。

Swing check valves are widely used automatic valves in industrial pipelines, with nominal sizes typically covering the large-diameter range of DN 50 to DN 750. Unlike the lift check valve, the swing check valve adopts an internal rocker arm swing structure, and the opening and closing member (valve disc) rotates around the axis like a door, relying on the force of medium flow to open or close on its own.

这种独特的悬臂内置回转设计，不仅减小了阀体的外漏点，还使得阀瓣在360度范围内具有一定的自由度，能够实现微量位置补偿，确保密封面全面接触。当介质正常流动时，阀瓣被推开，由于流道通畅，流体几乎不受阻碍，因此压力降极小；当介质逆流时，阀瓣在反向力和重力作用下迅速关闭。

This unique cantilever built-in rotary design not only reduces the external leakage points of the valve body, but also gives the valve disc a certain degree of freedom within a 360 degree range, which can achieve micro position compensation and ensure full contact of the sealing surface. When the medium flows normally, the valve disc is pushed open, and due to the unobstructed flow path, the fluid is almost unobstructed, resulting in minimal pressure drop; When the medium flows back, the valve disc quickly closes under the action of reverse force and gravity.

旋启式止回阀的阀瓣与阀座密封面通常堆焊硬质合金，具备极强的耐磨、耐高温和抗擦伤性能。其动作灵敏、低压密封性好，且关闭快速，能有效减小水锤压力。无论是在-46℃的低温还是550℃的高温环境下，旋启式止回阀都能在水、蒸汽、油品及天然气等介质的输送中保持卓越性能，是石油、化工等长输管线中不可或缺的防回流卫士。

The valve disc and seat sealing surface of the rotary check valve are usually welded with hard alloy, which has strong wear resistance, high temperature resistance, and abrasion resistance. It is sensitive in action, has good low-pressure sealing, and closes quickly, effectively reducing water hammer pressure. Whether in low temperature environments of -46 ℃ or high temperature environments of 550 ℃, swing check valves can maintain excellent performance in the transportation of media such as water, steam, oil, and natural gas, making them an indispensable anti backflow guard in pipelines such as petroleum and chemical industries.

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