旋啟式止回閥是工業(yè)管線中應(yīng)用出彩為廣泛的自動(dòng)閥門(mén)，其公稱尺寸通常覆蓋DN 50至DN 750的大口徑范圍。與升降式止回閥不同，旋啟式止回閥采用內(nèi)裝搖臂旋啟式結(jié)構(gòu)，啟閉件（閥瓣）像一扇門(mén)一樣，依靠介質(zhì)流動(dòng)的力量繞軸旋轉(zhuǎn)，自行開(kāi)啟或關(guān)閉。

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.

這種獨(dú)特的懸臂內(nèi)置回轉(zhuǎn)設(shè)計(jì)，不僅減小了閥體的外漏點(diǎn)，還使得閥瓣在360度范圍內(nèi)具有一定的自由度，能夠?qū)崿F(xiàn)微量位置補(bǔ)償，確保密封面多維度接觸。當(dāng)介質(zhì)正常流動(dòng)時(shí)，閥瓣被推開(kāi)，由于流道通暢，流體幾乎不受阻礙，因此壓力降出彩??；當(dāng)介質(zhì)逆流時(shí)，閥瓣在反向力和重力作用下迅速關(guān)閉。

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.

旋啟式止回閥的閥瓣與閥座密封面通常堆焊硬質(zhì)合金，具備出眾的耐磨、耐高溫和抗擦傷性能。其動(dòng)作靈敏、低壓密封性好，且關(guān)閉快速，能有效減小水錘壓力。無(wú)論是在-46℃的低溫還是550℃的高溫環(huán)境下，旋啟式止回閥大多能在水、蒸汽、油品及天然氣等介質(zhì)的輸送中保持出眾性能，是石油、化工等長(zhǎng)輸管線中不可或缺的防回流衛(wèi)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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