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The DFT® Model GLC® Silent Check Valve is a spring-assisted, center guided, in-line, flanged check valve that provides reliable, low maintenance service for a wide range of fluids and pressure/temperature combinations. The valve consists of a body, seat, spring, disc with stem and guide bushing. Some valves have body or gasket seals. The DFT® GLC® check valve has the advantage of minimum pressure loss with silent, non-slam operation.
Unit of Measure

Inventory

Inventory

 N/A {0}

Specifications

Series

 N/A GLC®

Size

 N/A 1.00 inDN 25

Cold Working Pressure

 N/A 740 psig51.06 barg

Working Steam Pressure

 N/A 665 psig

ASME CLASS

 N/A 300

Dimension A

 N/A 4.75 in121 mm

Dimension B

 N/A 4.88 in124 mm

Weight

 N/A 9 lb4.1 kg

Cracking Pressure CP

 N/A 0.85 psig0.059 bar

Trim Material

 N/A 316 SS

Disc

 N/A 316 SS

ENDS

 N/A Flanged (RF)

Cv

 N/A 19

Other

 N/A API 6D API 6FD (ASME CLASS 150/300, 2" to 24" Only) API PED (Except Cast Iron)

Temperature Rating

 N/A -20 to 250 ºF

Materials of Construction

Body

 N/A A216 Grade WCB

Body Material

 N/A Carbon Steel
Seat1 N/A Buna-N (75 dur.)
Spring2 N/A Inconel® X-750

Bushing

 N/A 316 SS
Gasketing3 N/A No Gasket in 1" & 1.5"- 150, 300, 600 Class

Available Soft Seat Materials

Available Soft Seat Materials4 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 B16.20 B16.34 B16.5
MSS5 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)
ASTM6 N/A A126 CLASS B A216GR WCB A351GR CF8M

Features

N/A

  • "Short" Face-To-Face dimensions
  • API 6FA Fire Test
    • ASME Class 150 and 300
    • 2" to 24"
  • Meets API 6D
  • ASME Class 150 to 2500
    • 1" to 42" Line Size
    • 316 SS Trim
    • RF Flanged Ends
    • MSS-SP61 Seat Leakage
  • One-Piece Body
  • Standard Body Materials:
    • A216 Grade WCB Carbon Steel
    • A351 CF8M Stainless Steel
  • Spring-Assisted Silent Closing, Non-Slam
  • Center-Guided
  • Dual-Guided Stem
  • Horizontal or Vertical Installation
  • Axial Flow/Nozzle Style
  • Easy Maintenance

Options

N/A

  • Inconel® X-750 Spring
  • Soft Seat (For Bubble-Tight Shutoff)
  • Custom Sizing Low Flow
  • Body Materials
    • Alloy 20, Duplex SS, Hastelloy®, Monel, Nickel-Aluminum Bronze
  • Severe Service Trim
  • Stellited trim (600 ºF+)
  • RTJ Ends
  • 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

  • 1 Soft seats are available for bubble-tight shutoff.
  • 2 Inconel® X-750 spring is available.
  • 3 CFG Corrugated flexible graphite (316 graphite material) (Class 150 & 300), 316 SS/Graphite Spiral Wound (Class 600 & up).
  • 4 TFE-Viton: Teflon Encapsulated Viton
  • 5
    1. SP-61: Class 125 and 250 Cast Iron valves are leak tested in accordance with AWWA.
    2. SP-125, SP-250: Cast Iron Valves only.
    3. SP-126: Except Cast Iron Valves.
  • 6
    1. API 6D, API 6FA: ASME 150 & 300, 2" to 24" only.
    2. Contact DFT for NACE.