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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
Unit of Measure

Specifications

Series

 N/A TLW®

Size

 N/A 20.0 inDN 500

Cold Working Pressure

 N/A 275 psig18.98 barg

Working Steam Pressure

 N/A 180 psig

ASME CLASS

 N/A 150

Dimension A

 N/A 8.62 in219 mm

Dimension B

 N/A 27 in685.8 mm

Weight

 N/A 708 lb321.2 kg

Cracking Pressure CP

 N/A 0.54 psig0.037 bar
Temperature Rating1
N/A -460 to 450 ºF-273.33 to 232.22 ºC

ENDS

 N/A Wafer (RF)

Cv

 N/A 3750

Materials of Construction

Body2 N/A A351 CF8M

Trim

 N/A 316 SS

Seat

 N/A 316 SS
Spring3 N/A Inconel® X-750

Body Material

 N/A 316 Stainless Steel

Disc/Stem Assembly

 N/A 316 SS/Nitronic 60
Bushing4 N/A A479 316
Gasketing5 N/A CFG (Corrugated Flexible Graphite)

Codes and Standards

ANSI

 N/A B1.1 B16.34 B16.5

ASTM

 N/A A216GR WCB A351GR CF8M

MSS

 N/A SP-25 SP-6 SP-61

Other

 N/A API 594

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)

Application

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

Industry

N/A Building Maintenance Chemical Processing Food, Beverage & Pharmaceutical Gas Transmission Mining Petroleum Production & Refining Power Generation Primary Metals Pulp & Paper Textiles

  • 1 Pressure/Temperature ratings in accordance with ASME/ANSI B16.34
    For Class 600/900/1500/2500 Consult DFT Factory.
  • 2 Other Body Material Available.
  • 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