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The DFT® Excalibur® Silent Check Valve is a spring-assisted, center guided, in-line, check valve that provides reliable, low maintenance service for a wide range of fluids and pressure/temperature combinations. The valve consists of a body, gasket, seat, spring, disc with stem and guide bushing. Excalibur® check valves are available in a wide range of sizes and pressure ratings and in a variety of metals to meet most check valve requirements.

Standard Features:
  • 2" to 24" Line size
  • ASME Class 150 to 1500
  • ASME B16.10 Face-to-Face Dimensions
  • Standard Body Materials:
    • A216 Grade WCB Carbon Steel
    • A351 CF8M Stainless Steel
    • Other Options Available
  • Standard Ends are RF Flanged
  • Optional Ends (4): Butt Weld, Flanged x Butt Weld, RTJ, Victaulic®
  • Center-Guided / Dual-Guided Stem
  • Two-Piece Body
  • Horizontal or Vertical Installation
Unit of Measure

Inventory

Inventory

 N/A {0}

Specifications

Series

 N/A Excalibur®

Size

 N/A 4.00 inDN 100

Cold Working Pressure

 N/A 3705 psig255.65 barg

Working Steam Pressure

 N/A 3090 psig

ASME CLASS

 N/A 1500

Dimension A

 N/A 21.50 in546 mm

Dimension B

 N/A 12.25 in311 mm

Weight

 N/A 276 lb125.2 kg

Cracking Pressure CP

 N/A 0.74 psig0.051 bar

Disc

 N/A 316 SS
ENDS1 N/A Flanged (RF)

Temperature Rating

 N/A -20 to 450 ºF

Cv

 N/A 187

Other

 N/A API PED

Hardware

 N/A A194-B7, A194-2H

Materials of Construction

Body

 N/A A216 Grade WCB

Body Material

 N/A Carbon Steel

Trim

 N/A 316 SS
Seat2 N/A 316 SS

Disc/Stem Assembly

 N/A 316 SS
Spring3 N/A 316 SS

Bushing

 N/A 316 SS
Bolting4 N/A A193-B7 (Stud) & A194-2H (Nut)
Gasketing5 N/A 316 Spiral wound with Flexible Graphite Filler

Available Soft Seat Materials

Available Soft Seat Materials6 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 B16.10 B16.20 B16.25 B16.34 B16.5

MSS

 N/A SP-126 SP-25 SP-6 SP-61
ASTM7 N/A A216GR WCB A351GR CF8M

Features

N/A

  • ASME B16.10 Face-to-Face dimensions
  • Spring-assisted silent closing, non-slam
  • 2" to 24" Line size
  • ASME 150 to 1500
  • WCB & SS bodies
  • SS trim
  • Ends:
    - RF Flanged
    - RTJ
  • Center guided
  • Dual guided stem
  • Horizontal or vertical installation
  • Tight shut-off
  • Two piece body
  • Protected spring
  • Easy maintenance
  • Versatile
  • Axial flow
  • Nozzle style

Options

N/A

  • Soft seat
  • Inconel® X-750 Spring
  • Custom sizing - low flow
  • Severe service trim
  • Body Materials:
    - Alloy 20
    - Hastelloy®
    - Inconel® 600
    - Monel
  • Stellited trim (600°F+)
  • Ends:
    - Butt weld
    - Flanged x Butt weld
    - Victaulic®
  • NACE

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

  • 1 Consult DFT for availability
  • 2 Soft seats are available for bubble-tight shutoff.
  • 3 Inconel® 750 spring is available.
  • 4 Contact DFT for stainless steel or other bolting materials.
  • 5 Contact DFT for other gasket materials.
    CFG - 316 graphite material.
  • 6 TFE-Viton : Teflon Encapsulated Viton
  • 7 Contact DFT for NACE.