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The DFT® Model WLC Wafer style Silent Check Valve is a lightweight, spring-assisted, in-line 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.

Size/Class
  • 1", 1 1/2" - 150/300
  • 2" to 8" - 150/300
  • 10" - 150
Unit of Measure

OLD NPT #

OLD PART #

 N/A 9035-1

Specifications

Series

 N/A WLC®

ASME CLASS

 N/A 150 300

Size

 N/A 1.50 inDN 40

Dimension A

 N/A 2.5 in64 mm

Dimension B

 N/A 3.75 in95 mm

Weight

 N/A 4 lb1.8 kg

Cracking Pressure CP

 N/A 0.012 bar0.17 psig

Cracking Pressure CP Tolerance

 N/A ±10%

ENDS

 N/A Wafer (RF)

Cv

 N/A 36

Materials of Construction

Body

 N/A A351 CF8M

Body Material

 N/A Stainless Steel

Disc/Stem Assembly

 N/A A351 CF8M/A479 316

Seat

 N/A A351 CF8M

Spring

 N/A A313 316

Bushing

 N/A A479 316 (No bushing in 1" and 1.5", 150 & 300)

Trim

 N/A CF8M/316 SS

Available Soft Seat Materials

Available Soft Seat Materials

 N/A Buna-N (-70 to 250°F) EPDM (-75 to 300°F) TFE®-Viton® (-40 to 400°F) Viton® (-40 to 400°F) Zelon® (37 to 400°F)

Codes and Standards

ANSI

 N/A B1.1 B16.25 B16.34 B16.5
MSS1 N/A SP-125 SP-126 SP-25 SP-6 SP-61

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

Options2 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

Inventory

Inventory

 N/A {0}
  • 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.
  • 2 NACE - Contact DFT for NACE