力士樂安全閥DBDH6K1C/210E上海韋米機電設備有限公司主營產品之一，銷售熱線： ；聯系人：雷青；業務QQ：---；手機微信： ； ；傳真 ；原廠直銷，質量保障，價格優惠！

安全閥在系統中起安全保護作用。當系統壓力超過規定值時，安全閥打開，將系統中的一部分氣體/流體排入大氣/管道外，使系統壓力不超過允許值，從而保證系統不因壓力過高而發生事故。
安全閥結構主要有兩大類：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，也稱為先導式安全閥，由主安全閥和輔助閥組成。當管道內介質壓力超過規定壓力值時，輔助閥先開啟，介質沿著導管進入主安全閥，并將主安全閥打開，使增高的介質壓力降低。

 

按結構分
按其整體結構及加載機構的不同可以分為重錘杠桿式、彈簧式和脈沖式三種。
1.重錘杠桿式安全閥
重錘杠桿式安全閥是利用重錘和杠桿來平衡作用在閥瓣上的力。根據杠桿原理，它可以使用質量較小的重錘通過杠桿的增大作用獲得較大的作用力，并通過移動重錘的位置(或變換重錘的質量)來調整安全閥的開啟壓力。
重錘杠桿式安全閥結構簡單，調整容易而又比較準確，所加的載荷不會因閥瓣的升高而有較大的增加，適用于溫度較高的場合，過去用得比較普遍，特別是用在鍋爐和溫度較高的壓力容器上。但重錘杠桿式安全閥結構比較笨重，加載機構容易振動，并常因振動而產生泄漏；其回座壓力較低，開啟后不易關閉及保持嚴密。
2.彈簧微啟式安全閥
彈簧微啟式安全閥是利用壓縮彈簧的力來平衡作用在閥瓣上的力。螺旋圈形彈簧的壓縮量可以通過轉動它上面的調整螺母來調節，利用這種結構就可以根據需要校正安全閥的開啟(整定)壓力。彈簧微啟式安全閥結構輕便緊湊，靈敏度也比較高，安裝位置不受限制，而且因為對振動的敏感性小，所以可用于移動式的壓力容器上。這種安全閥的缺點是所加的載荷會隨著閥的開啟而發生變化，即隨著閥瓣的升高，彈簧的壓縮量增大，作用在閥瓣上的力也跟著增加。這對安全閥的迅速開啟是不利的。另外，閥上的彈簧會由于長期受高溫的影響而使彈力減小。用于溫度較高的容器上時，常常要考慮彈簧的隔熱或散熱問題，從而使結構變得復雜起來。
3.脈沖式安全閥
脈沖式安全閥由主閥和輔閥構成，通過輔閥的脈沖作用帶動主閥動作、其結構復雜，通常只適用于安全泄放量很大的鍋爐和壓力容器。
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力士樂安全閥DBDH6K1C/210E


按作用原理分
按作用原理分類，可以分為直接作用式安全閥和非直接作用式安全閥。
1.直接作用式安全閥
直接作用式安全閥是在工作介質的直接作用下開啟的，即依靠工作介質壓力的作用克服加載機構加于閥瓣的機械載荷，使閥門開啟。這種安全閥具有結構簡單，動作迅速，可靠性好等優點。但因為依靠結構加載，其載荷大小受到限制，不能用于高壓、大口徑的場合。
2.非直接作用式安全閥
這類安全閥可以分為先導式安全閥、帶動力輔助裝置的安全閥。
先導式安全閥是依靠從導閥排出的介質來驅動或控制的。而導閥本身是一個直接作用式安全閥，有時也采用其他形式的閥門。先導式安全閥適用于高壓、大口徑的場合。先導式安全閥的主閥還可以設計成依靠工作介質來密封的形式，或者可以對閥瓣施加比直接作用式安全閥大得多的機械載荷，因而具有良好的密封性能。同時，它的動作很少受背壓的影響。這種安全閥的缺點在于它的可靠性同主閥和導閥有關，動作不如直接作用式安全閥那樣迅速、可靠，而且結構較復雜。
帶動力輔助裝置的安全閥是借助于一個動力輔助裝置，在低于正常開啟壓力的情況下強制安全閥開啟。這種安全閥適用于開啟壓力很接近于工作壓力的場合，或需定期開啟安全閥以進行檢查或吹除粘著、凍結的介質的場合。同時，也提供了一種在緊急情況下強制開啟安全閥的手段。
力士樂安全閥DBDH6K1C/210E
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力士樂安全閥DBDH6K1C/210E