美國DFT公司已經(jīng)有超過65年的歷史,專注于單向閥的設(shè)計和制造,DFT單向閥以防止和**
管道系統(tǒng)的水錘現(xiàn)象而聞名。美國DFT*初設(shè)計的基本型單向閥是為了滿足一個客戶的小型金屬密封
單向閥要求,隨著幾十年的發(fā)展,現(xiàn)在已形成一個全系列產(chǎn)品,共十大系列ALC®,DLC®,
DSV®,Excalibur®,F(xiàn)BC®,GLC®,GPV®,PDC®,SCV®和WLC®,每一個系列都對應(yīng)一種特殊的用途。
美國DFT傳統(tǒng)單向閥(旋啟式單向閥)一般依靠閥盤自重或介質(zhì)反向作用力關(guān)閉閥門。如事故停泵后介質(zhì)開
始倒流,在倒泄介質(zhì)的作用下,單向閥迅速關(guān)閉,由于閥座摩阻及介質(zhì)慣性的影響,美國DFT單向閥關(guān)閉通常滯后于開始倒流的時間,即在倒流量增至一定值,甚至在*大倒流量的瞬間迅速關(guān)閉,則能在單向閥處產(chǎn)生非常大的壓力。壓力峰值高,而且持續(xù)時間較長,*易產(chǎn)生水錘 。
美國DFT緩沖式單向閥:采用彈簧復(fù)位,緩沖式設(shè)計,可以**或*大限度減小水錘效應(yīng)。閥門有優(yōu)化的關(guān)閉特性,如在突然停泵時可迅速關(guān)閉,阻止介質(zhì)倒流保護(hù)水泵不致發(fā)生反轉(zhuǎn),達(dá)到保護(hù)水泵的目的;且可在關(guān)閉的*后階段實現(xiàn)緩閉,減少突然關(guān)閉造成管路中的水錘,達(dá)到保護(hù)管路的目的。壓力峰值小,持續(xù)時間短,避免了如其它形式單向閥閥盤撞擊閥座產(chǎn)生的水錘現(xiàn)象,降低系統(tǒng)噪音,并防止管路系統(tǒng)損壞。
經(jīng)營產(chǎn)品:
美國DFT單向閥、美國DFT控制閥、美國DFT調(diào)節(jié)閥等
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