力士樂安全閥DBDH6G1A/400上海韋米機(jī)電設(shè)備有限公司主營產(chǎn)品之一，銷售熱線： ；聯(lián)系人：雷青；業(yè)務(wù)QQ：---；手機(jī)微信： ； ；傳真 ；原廠直銷，質(zhì)量保障，現(xiàn)貨庫存，價格優(yōu)惠！

安全閥是啟閉件受外力作用下處于常閉狀態(tài)，當(dāng)設(shè)備或管道內(nèi)的介質(zhì)壓力升高超過規(guī)定值時，通過向系統(tǒng)外排放介質(zhì)來防止管道或設(shè)備內(nèi)介質(zhì)壓力超過規(guī)定數(shù)值的特殊閥門。安全閥屬于自動閥類，主要用于鍋爐、壓力容器和管道上，控制壓力不超過規(guī)定值，對人身安全和設(shè)備運(yùn)行起重要保護(hù)作用。注安全閥必須經(jīng)過壓力試驗(yàn)才能使用。

安全閥是閥門家族比較特殊的一個分支，它的特殊性是因?yàn)椴煌�于其它閥門僅僅起到開關(guān)的作用，更重要的是起到保護(hù)設(shè)備的安全。隨著我國經(jīng)濟(jì)建設(shè)的快速發(fā)展，在帶有壓力操控的設(shè)備項(xiàng)目工程越來越多。鑒于設(shè)備泄壓的需要，安全閥在保護(hù)設(shè)備過程中起到至關(guān)重要的作用。截止2013年各類安全閥制造商和貿(mào)易商已超過700多家，每日交易詢盤達(dá)到200多條，安全閥供求市場明顯升溫。通過*季度數(shù)據(jù)初步分析，安全閥需求量要高出二十個百分點(diǎn)。安全閥是鍋爐、壓力容器和其他受壓力設(shè)備上重要的安全附件。安全閥(又稱泄壓閥)是根據(jù)壓力系統(tǒng)的工作壓力(工作溫度)自動啟閉，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)壓力或溫度超過安全閥設(shè)定壓力時，自動開啟泄壓或降溫，保證設(shè)備和管道內(nèi)介質(zhì)壓力(溫度)在設(shè)定壓力(溫度)之下，保護(hù)設(shè)備和管道正常工作，防止發(fā)生意外，減少損失。安全閥主要被廣泛應(yīng)用于：蒸汽鍋爐、液化石油氣汽車槽車或液化石油氣鐵路罐車、采油井、蒸汽發(fā)電設(shè)備的高壓旁路、壓力管道、壓力容器等。安全閥一般按結(jié)構(gòu)形式分為彈簧式安全閥和杠桿式安全閥、脈沖式安全閥，其中彈簧式安全閥應(yīng)用*為普遍;按連接方式分為螺紋安全閥和法蘭安全閥。安全閥口徑一般都不大，常用的都在DN15mm-DN80mm之間，超過150mm一般都稱為大口徑安全閥。2013年安全閥行業(yè)市場規(guī)模擴(kuò)大，這已是一個不爭的事實(shí)。我國能夠有資質(zhì)生產(chǎn)安全閥會。

 

安全閥在系統(tǒng)中起安全保護(hù)作用。當(dāng)系統(tǒng)壓力超過規(guī)定值時，安全閥打開，將系統(tǒng)中的一部分氣體/流體排入大氣/管道外，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。


安全閥結(jié)構(gòu)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(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，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。

按結(jié)構(gòu)分
按其整體結(jié)構(gòu)及加載機(jī)構(gòu)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(jù)杠桿原理，它可以使用質(zhì)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(zhì)量)來調(diào)整安全閥的開啟壓力。
重錘杠桿式安全閥結(jié)構(gòu)簡單，調(diào)整容易而又比較準(zhǔn)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(jié)構(gòu)比較笨重，加載機(jī)構(gòu)容易振動，并常因振動而產(chǎn)生泄漏；其回座壓力較低，開啟后不易關(guān)閉及保持嚴(yán)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(zhuǎn)動它上面的調(diào)整螺母來調(diào)節(jié)，利用這種結(jié)構(gòu)就可以根據(jù)需要校正安全閥的開啟(整定)壓力。彈簧微啟式安全閥結(jié)構(gòu)輕便緊湊，靈敏度也比較高，安裝位置不受限制，而且因?yàn)閷φ駝拥拿舾行孕�，所以可用于移動式的壓力容器上。這種安全閥的缺點(diǎn)是所加的載荷會隨著閥的開啟而發(fā)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(jié)構(gòu)變得復(fù)雜起來。
3.脈沖式安全閥
脈沖式安全閥由主閥和輔閥構(gòu)成，通過輔閥的脈沖作用帶動主閥動作、其結(jié)構(gòu)復(fù)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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R901419086 DBDS10G1X/375E
R900424744 DBDS10G1X/400
力士樂安全閥DBDH6G1A/400


按介質(zhì)分
按照介質(zhì)排放方式的不同， 安全閥又可以分為全封閉式、半封閉式和開放式等三種。
1.全封閉安全閥
全封閉式安全閥排氣時，氣體全部通過排氣管排放，介質(zhì)不能間外泄漏，主要用于介質(zhì)為有毒。易燃?xì)怏w的容器。
2.半封閉式安全閥
半封閉式安全閥所排出的氣體一部分通過排氣管，也有一部分從閥蓋與閥桿間的間隙中漏出，多用于介質(zhì)為不會污染環(huán)境的氣體的容器。
3.開放式安全閥
開放式安全閥的閥蓋是敞開的，使彈簧腔室與大氣相通，這樣有利于降低彈簧的溫度，主要適用于介質(zhì)為蒸汽，以及對大氣不產(chǎn)生污染的高溫氣體的容器。

按閥瓣開啟分
按照閥瓣開啟的*大高度與安全閥流道直徑之比來劃分，安全閥又可分為彈簧微啟封閉高壓式安全閥和彈簧全啟式安全閥兩種。
1.彈簧微啟封閉式高壓安全閥
微啟式安全閥的開啟高度小于流道直徑的1/4，通常為流道直徑的1/40一1/20。微啟式安全閥的動作過程是比例作用式的，主要用于液體場合，有時也用于排放量很小的氣體場合。
2.彈簧全啟式安全閥
全啟式安全閥的開啟高度大于或等于流道直徑的1/4。全啟式安全閥的排放面積是閥座喉部*小截面積。其動作過程是屬于兩段作用式，必須借助于一個升力機(jī)構(gòu)才能達(dá)到全開啟，全啟式安全閥主要用于氣體介質(zhì)的場合。
3.中啟式安全閥
開啟高度介于微啟式與全啟式之間。即可以做成兩段作用，也可以做成比例作用式。
力士樂安全閥DBDH6G1A/400
R900340395 DBDS10G1X/400SO32
R900337132 DBDS10G1X/400W1
R901421159 DBDS10G1X/400-320
R900967544 DBDS10G1X/400-330
R901283265 DBDS10G1X/400-350
R900934571 DBDS10G1X/400-350V
R900558953 DBDS10G1X/400-370
R901243540 DBDS10G1X/400-400
R900342738 DBDS10G1X/400/12
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R900535540 DBDS10G1X/400/2
R900471909 DBDS10G1X/400/5
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力士樂安全閥DBDH6G1A/400