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計(jì)量泵技術(shù)
您的當(dāng)前位置：巴特首頁 > 技術(shù)支持 > 計(jì)量泵技術(shù) >計(jì)量泵為什么要配安全閥
來源：巴特計(jì)量泵、齒輪泵公司 發(fā)布時(shí)間：2013-11-07 11:45:51 瀏覽次數(shù)：次
計(jì)量泵為什么要配套安全閥？安全閥在計(jì)量泵系統(tǒng)中起安全保護(hù)作用，如果沒有安全閥，有時(shí)甚至?xí)鸨ㄊ录陌l(fā)生。安全閥根據(jù)工作壓力能自動(dòng)啟閉，一般安裝于封閉系統(tǒng)的設(shè)備或管路上保護(hù)系統(tǒng)安全。當(dāng)設(shè)備或管道內(nèi)壓力超過規(guī)定值時(shí)，即自動(dòng)開啟泄壓，保證設(shè)備和管道內(nèi)介質(zhì)壓力在規(guī)定數(shù)值以內(nèi)，防止發(fā)生事故。當(dāng)系統(tǒng)壓力超過規(guī)定值時(shí)，安全閥自動(dòng)打開，將系統(tǒng)中的一部分氣體排入大氣，使系統(tǒng)壓力不超過允許值，從而保證系統(tǒng)不因壓力過高而發(fā)生事故。
安全閥又稱溢流閥。安全閥的幾種典型結(jié)構(gòu)形式。1.活塞式安全閥，閥芯是一平板。氣源壓力作用在活塞上，當(dāng)壓力超過由彈簧力確定的安全值時(shí)，活塞被頂開，一部分壓縮空氣即從閥口排入大氣。當(dāng)氣源壓力低于安全值時(shí)，彈簧驅(qū)動(dòng)活塞下移，關(guān)閉閥口。此閥密封面要干凈。
安全閥的結(jié)構(gòu)主要有兩類：彈簧式和杠桿式。彈簧式是指閥瓣與閥座的密封靠彈簧的作用力。杠桿式是靠杠桿和重錘的作用力。隨著大容量的需要，又有一種脈沖式安全閥，稱為先導(dǎo)式安全閥，由主安全閥和輔助閥組成。當(dāng)管道內(nèi)介質(zhì)壓力超過規(guī)定壓力值時(shí)，輔助閥先開啟，介質(zhì)沿著導(dǎo)管進(jìn)入主安全閥，并將主安全閥打開，使增高的介質(zhì)壓力降低。
安全閥的排放量決定于閥座的口徑與閥瓣的開啟高度，也可分為兩種：微啟式開啟高度是閥座內(nèi)徑的（1/15）～（1/20），全啟式是（1/3）～（1/4）。
另外，隨著使用要求的不同，有封閉式和不封閉式。封閉式即排出的介質(zhì)不外泄，全部沿著規(guī)定的出口排出，一般用于有毒和有腐蝕性的介質(zhì)。不封閉式一般用于無毒或無腐蝕性的介質(zhì)。
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