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The DFT® Model WLC® Wafer Style Check Valve is a lightweight, spring-assisted, center-guided, non-slam check valve that provides reliable, low-maintenance service for a wide range of fluids and pressure/ temperature combinations. The joint between the seat ring and body is sealed by the flange gasket upon installation preventing any leakage through the joint when the valve is in service.
Unit of Measure

Inventory

Inventory

 N/A {0}

Specifications

Series

 N/A WLC®

Size

 N/A 4.00 inDN 100

Cold Working Pressure

 N/A 740 psig

Working Steam Pressure

 N/A 635 psig

ASME CLASS

 N/A 150 300

Dimension A

 N/A 4 in101.6 mm

Dimension B

 N/A 7.09 in180.09 mm

Weight

 N/A 20 lb9.07 kg

Cracking Pressure CP

 N/A 0.19 psig0.013 bar

Cracking Pressure CP Tolerance

 N/A ±10%

Other

 N/A API 594 (600#, 900/1500#) API PED (EXCEPT CAST IRON VALVES)

Disc

 N/A 316 SS

ENDS

 N/A Wafer (RF)

Cv

 N/A 265

Temperature Rating

 N/A -20 to 400 ºF-28.89 to 204.44 ºC

Materials of Construction

Body

 N/A A216 Grade WCB

Body Material

 N/A Carbon Steel

Spring

 N/A 316 SS

Bushing

 N/A A479 316

Trim

 N/A 316 SS

Disc/Stem Assembly

 N/A 316 SS

Seat

 N/A Teflon Encapsulated Viton®

Available Soft Seat Materials

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)

Codes and Standards

ANSI

 N/A B1.1 B16.20 B16.34 B16.5
MSS1 N/A SP-125 (CAST IRON VALVES ONLY) SP-126 (EXCEPT CAST IRON VALVES) SP-25 SP-6 SP-61(CLASS 125 & 250 CAST IRON VALVES)

ASTM

 N/A A126 CLASS B A216GR WCB A351GR CF8M

Features

N/A

  • Wafer design
  • Lightweight
  • Spring-assisted silent closing
  • Edge guided (1" & 1 1/2"-ASME 600 to 2500)
  • Center guided/Dual guided stem
    - 1" to 10" ASME 150/300
    - 2" to 10" ASME 600 to 2500
  • Horizontal or vertical installation
  • Protected spring
  • ASME 150 to 2500
    - 1" to 10" Line Size
    - WCB & SS bodies
    - SS trim
    - Ends:
      - Wafer RF
      - Wafer RTJ
    - MSS-SP 61 seat leakage
    - API 594 Face-to-Face dimension:
      - Class 600 RF
      - Class 900/1500 RF
  • Axial flow
  • Nozzle style

Options

N/A

  • Inconel® X-750 - CP Standard (X)
  • Inconel® X-750 - CP 0.1 psi (XC001)
  • Inconel® X-750 - CP 0.2 psi (XC002)
  • Soft Seat
  • Custom Sizing- low flow
  • Body Materials:
    - Alloy 20, Hastelloy, Inconel® 625,
    Titanium
  • Stellited trim (600°F+)
  • Weld Neck Flanges to meet B16.10
  • Face-to-Face dimensions
  • NACE

Application

N/A Autoclaves Boiler Feed & Discharge Chemical Lines Condensate Lines Cookers Cooling Towers Crude & Refined Product Lines Cryogenics Digester Evaporators Fly Ash System Generator Inlet & Discharge Hydraulic Lines Metering Pumps Mine Dewatering Process Lines Pump Discharge Refrigeration Steam Lines Vacuum Breaker Water Lines Water Treatment

Note

Note

 N/A Sizes 1" to 8" are Dual Rated Class 150/300
Contact DFT for Class 2500 Availability.
  • 1
    • SP-61: Class 125 and 250 Cast Iron valves are leak tested in accordance with AWWA.
    • SP-125: Cast Iron Valves only. TFE-Viton® - Teflon Encapsulated Viton.
    • SP-126: Except Cast Iron Valves.