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(jì)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(jì)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(jì)，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(shí)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
 
部分型號：DFT Inc. 1" DSV Sanitary Check Valve  
DFT CHECK VALVE 8373HC 1-1/2" IN-LINE STAINLESS STEEL CHECK VALVE THREADED
NEW DFT WLC WAFER CHECK VALVE 9026
DFT Durable Stainless Steel Threaded In-Line Check Valve 8003 0.60PSI
DFT Durable Stainless Steel Threaded In-Line Check Valve 8003 0.60PSI
 
LAM 4420 Etcher Inner Gate Valve Drive 853-012200-002-H-DFT Working
DFT S/S Check Valve #8369 1" FNPT 750 CWP CF8M Body 510 PSI at 470F (NIB)
 
NEW DURABLA DFT 8003 STAINLESS THREADED 1/2IN NPT CHECK VALVE UNIT D309059
NEW - DFT 3" WAFER CHECK VALVE MODEL: 9022V
 
DFT 9012V CHECK VALVE WLC CLASS 250 SS 2-1/2"
NEW DFT STAINLESS STEEL 1-1/2" ID CHECK VALVE 3-1/2" OD 700 CWP MODEL 8007
NEW DFT INLET CHECK VALVE STAINLESS STEEL S/S 8008 2" 303SS 450 CWP 300/450° F
NEW DFT INLET CHECK VALVE S/S STAINLESS STEEL 8007 1-1/2" NPT BSS
 
DFT 9012V CHECK VALVE WLC CLASS 250 SS 2-1/2" NIB!!
DFT 9004 Check Valve 2" Class 150/300 Type 316 Stainless CF8M Body WLC one way
 
LOT OF 4, DFT STAINLESS STEEL CHECK VALVES, 8033, 1" BSSV, 9/16" DIA. INLET
NEW DFT VALVES 8008 2 BSS 303SS THREADED INLINE 2 IN NPT CHECK VALVE D280983
NEW DFT 1" SCV 8369HCY Check Valve Hastelloy Class 300 Cost over $675
 
 *NEW* STAINLESS STEEL DFT BASIC CHECK VALVE 8007 1-1/2"F NPT BSS X 3" MNPT 303SS10
NEW DFT WLC 11912 9026 3" WAFER 150/300 CHECK VALVE 316 SS Dual Rated Durabla
DFT 8003 Stainless Steel Threaded In-Line Check Valve FREE SHIPPING
WLC DFT 9014 WAFER STYLE SILENT CHECK VALVE / SPRING ASSISTED / SIZE 2.5
DFT DSV Sanitary Horizontal Check Valve P/N 2117V 2" Sanitary Flange 150CWP (NEW
DFT DSV Sanitary Horizontal Check Valve P/N 2117 2" Sanitary Flange 150CWP (NEW)
NEW DURABLA DFT DLC CF8M CLASS 300 3" CHECK VALVE SS STAINLESS STEEL 8"X12.385"NEW DURABLA DFT DLC CF8M CLASS 300 3" CHECK VALVE SS STAINLESS STEEL 8"X12.385"