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真空節(jié)流破壞閥,smc板材,smc氣動(dòng)原件,KQZD10-03S一級(jí)經(jīng)銷商,*,歡迎選購(gòu)
真空破壞閥（Vacuum Breaker Valve）是一種安全閥。主要用于容器或管道中，在管道或容器因系統(tǒng)運(yùn)行或停止而產(chǎn)生負(fù)壓或真空逐步升高時(shí)，該閥能自動(dòng)開啟，破壞真空效應(yīng)，使管道及其它設(shè)備不至產(chǎn)生癟、凹裂等現(xiàn)象，以保護(hù)設(shè)備的安全。
發(fā)展歷史
*代氣壓式
原始的氣壓式真空破壞閥由于需要專門的氣源和直流設(shè)備，已逐步淘汰。
第二代電動(dòng)式
第二代的電動(dòng)式真空破壞閥同水泵同通電，斷電。一旦出現(xiàn)非事故的停電，此閥就能自動(dòng)馬上打開，破壞虹吸，截?cái)嗨?，防止水流倒灌?huì)產(chǎn)生主機(jī)的葉輪飛揚(yáng)的事件。
此閥門關(guān)閉動(dòng)力源是采用100%節(jié)能電磁鐵，工作電源是采用220V，50Hz，其維護(hù)工作電壓只要300毫安。能長(zhǎng)時(shí)間工作，電磁鐵的溫升只要10K。開閥動(dòng)力采用蓄能彈簧，能在2~5秒之間打開。還設(shè)有手動(dòng)開閥、關(guān)閥的裝置。人工操作方便、安全系數(shù)大。
但由于此閥耗電且一旦其電路發(fā)生故障即*失效，所以也沒(méi)有*得到市場(chǎng)的認(rèn)可。
第三代機(jī)械式
第三代真空破壞閥為機(jī)械式結(jié)構(gòu)。在系統(tǒng)形成真空時(shí)由大氣壓力直接頂開擋板往系統(tǒng)加氣，迅速破壞真空，防止負(fù)壓危害。0.2bar的密封壓力保證了在系統(tǒng)正壓時(shí)*不滲漏。由于不需要耗電，使用壽命長(zhǎng)，破真空及時(shí)而得到市場(chǎng)的*歡迎。
真空節(jié)流破壞閥,smc板材,smc氣動(dòng)原件,KQZD10-03S一級(jí)經(jīng)銷商,*,歡迎選購(gòu)
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