DFT® Inc
DFT® Inc
140 Sheree Blvd. PO Box 566
Exton, PA 19341-0566
Phone: 800.206.4013
Fax: 847.540.1422
Email: dft@dft-valves.com
Website: www.dft-valves.com
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The TLW® Check Valve (Tapped Lug Wafer) was engineered for applications where exposed studs are not suitable. This non-slam spring-assisted, center-guided, lugged pattern wafer check valve is designed to prevent water hammer and reverse flow. The lightweight compact design fits between mating flanges and meets API 594 face-to-face dimensions. The TLW® Check Valve body design eliminates potential leak paths to the environment and is an easy-to-maintain check valve for applications involving liquids, gases, or steam. Tapped holes are provided in the body for lifting lugs to assist with installation (10" and larger sizes only).

Standard Features:
  • Sizes 2" thru 24"
  • ASME Class 150 and 300
  • Standard Body Materials:
    • A216 Grade WCB Carbon Steel
    • A351 CF8M Stainless Steel
  • API 594 Face-to-Face Dimensions
  • Threaded Lug Design
  • ASME B16.5 Bolt Hole Pattern
  • RF Wafer Ends
  • Horizontal or Vertical Installation
TLW® Wafer Check Valves
Unit of Measure
Items TLW® Wafer Check Valves
425H1A4A5
API 594 Face-to-Face 2" 316 SS Trim A351 CF8M Class 150 TLW® Wafer Check Valve 		TLW® Wafer Check Valves
425H1B4A5
API 594 Face-to-Face 2" 316 SS Trim A351 CF8M Class 300 TLW® Wafer Check Valve 		TLW® Wafer Check Valves
422H1B4A5
API 594 Face-to-Face 2" A216 WCB Body, 316SS Trim ANSI Class 300 TLW® Wafer Check Valve 		TLW® Wafer Check Valves
422H1A4A5
API 594 Face-to-Face 2" A216 WCB Body, 316SS Trim ANSI Class 150 TLW® Wafer Check Valve 		TLW® Wafer Check Valves
422H1A4H5
API 594 Face-to-Face 2" 316 SS/Viton®-F A216 WCB Class 150 TLW® Wafer Check Valve
Series N/A TLW®
Size N/A 2.00 in
Cold Working Pressure N/A 275 psig N/A 720 psig N/A 740 psig N/A 285 psig N/A
Working Steam Pressure N/A 110 psig N/A 435 psig N/A 530 psig N/A 110 psig N/A
ASME CLASS N/A 150 N/A 300 N/A 300 N/A 150 N/A 150
Dimension A N/A 2.38 in
Dimension B N/A 6.00 in N/A 6.50 in N/A 6.50 in N/A 6.00 in N/A 6 in
Dimension C N/A
O.D. N/A
Weight N/A 15 lb N/A 17 lb N/A 17 lb N/A 15 lb N/A 15 lb
Cracking Pressure CP N/A 0.65 psig0.045 bar N/A 0.65 psig0.045 bar N/A 0.5 psig0.035 bar N/A 0.5 psig0.035 bar N/A 0.5 psig0.034 bar
Body1 N/A A351 CF8M N/A A351 CF8M N/A A216 Grade WCB N/A A216 Grade WCB N/A A216 Grade WCB
Trim N/A 316 SS
Temperature Rating2 N/A -460 to 700 ºF-273.33 to 371.11 ºC N/A -460 to 700 ºF-273.33 to 371.11 ºC N/A -20 to 700 ºF-28.89 to 371.11 ºC N/A -20 to 700 ºF-28.89 to 371.11 ºC N/A -40 to 400 ºF
Seat N/A 316 SS N/A 316 SS N/A 316 SS N/A 316 SS N/A 316 SS/Viton® F
Spring3 N/A Inconel® X-750
ANSI N/A B1.1 B16.34 B16.5 N/A B1.1 B16.34 B16.5 N/A B1.1 B16.34 B16.5 N/A B1.1 B16.34 B16.5 N/A B16.34 B16.5
Available Soft Seat Materials N/A Buna-N (-70 to 250ºF) EPDM (-75 to 300ºF) TFE®-Viton® (-40 to 400ºF) Viton® (-40 to 400ºF) Zelon® (37 to 470ºF)
Applications N/A Autoclaves Boiler Feed & Discharge Chemical Lines Compressor Discharge Condensate Lines Cookers Cooling Towers Crude & Refined Product Lines Cryogenics Digester Evaporators Fly Ash System Generator Inlet & Discharge Hydraulic Lines Metering Pumps Mine Dewatering Nitrogen Purge Process Lines Pump Discharge Refrigeration Steam Lines Vacuum Breaker Water Lines Water Treatment
ASTM N/A A216GR WCB A351GR CF8M
MSS N/A SP-25 SP-6 SP-61
Body Material N/A 316 Stainless Steel N/A 316 Stainless Steel N/A Carbon Steel N/A Carbon Steel N/A Carbon Steel
Disc/Stem Assembly N/A 316 SS/Nitronic 60
Bushing4 N/A A479 316
Gasketing5 N/A CFG (Corrugated Flexible Graphite)
Other N/A API 594
ENDS N/A Wafer (RF)
Cv N/A 120
  • 1 Other Body Material Available.
  • 2 Pressure/Temperature ratings in accordance with ASME/ANSI B16.34
    For Class 600/900/1500/2500 Consult DFT Factory.
  • 3 316 SS Spring is Available.
  • 4 Teflon® bearing on 14", 16", 18", 20", and 24". Maximum Temperature 450º F.
  • 5 316/Graphite Material. Gaskets Only Used on Valves 10" and Larger