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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
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Excalibur® Flanged Check Valves

A216 Grade WCB 2" 316 SS Trim Class 600 RF Excalibur® Flanged Check Valve
Excalibur® Flanged Check Valves

A351 CF8M 2" 316 SS Trim Class 300 RF Excalibur® Flanged Check Valve
Excalibur® Flanged Check Valves

A216 Grade WCB 2" 316 SS Trim Class 300 RF Excalibur® Flanged Check Valve
Excalibur® Flanged Check Valves

A351 CF8M 2" 316 SS Trim Class 900 RF Excalibur® Flanged Check Valve
Excalibur® Flanged Check Valves

A216 Grade WCB 2" 316 SS Trim Class 1500 RF Excalibur® Flanged Check Valve
Series N/A Excalibur®
Size N/A 2.00 inDN 50
Cold Working Pressure N/A 1480 psig102.12 barg N/A 720 psig49.68 barg N/A 740 psig51.06 barg N/A 2160 psig149.04 barg N/A 3705 psig255.65 barg
Working Steam Pressure N/A 1235 psig N/A 495 psig N/A 620 psig N/A 1485 psig N/A 3090 psig
ASME CLASS N/A 600 N/A 300 N/A 300 N/A 900 N/A 1500
Dimension A N/A 11.50 in292 mm N/A 10.50 in267 mm N/A 10.50 in267 mm N/A 14.50 in368 mm N/A 14.50 in368 mm
Dimension B N/A 6.50 in165 mm N/A 6.50 in165 mm N/A 6.50 in165 mm N/A 8.50 in216 mm N/A 8.50 in216 mm
Weight N/A 35 lb15.9 kg N/A 29 lb13.2 kg N/A 29 lb13.2 kg N/A 81 lb36.7 kg N/A 81 lb36.7 kg
Cracking Pressure CP N/A 0.64 psig0.044 bar N/A 0.64 psig0.044 bar N/A 0.64 psig0.044 bar N/A 0.85 psig0.059 bar N/A 0.85 psig0.059 bar
Body N/A A216 Grade WCB N/A A351 CF8M N/A A216 Grade WCB N/A A351 CF8M N/A A216 Grade WCB
Body Material N/A Carbon Steel N/A 316 Stainless Steel N/A Carbon Steel N/A 316 Stainless Steel N/A Carbon Steel
Trim N/A 316 SS
Seat1 N/A 316 SS
Disc/Stem Assembly N/A 316 SS
Disc N/A 316 SS
Spring2 N/A 316 SS
Bushing N/A 316 SS
Bolting3 N/A A193-B7 (Stud) & A194-2H (Nut)
Gasketing4 N/A 316 Spiral wound with Flexible Graphite Filler N/A CFG N/A CFG N/A 316 Spiral wound with Flexible Graphite Filler N/A 316 Spiral wound with Flexible Graphite Filler
Available Soft Seat Materials5 N/A Buna-N (-70 to 250ºF) EPDM (-75 to 300ºF) TFE®-Viton® (-40 to 400ºF) Viton® (-40 to 400ºF) Zelon® (37 to 470ºF)
ENDS6 N/A Flanged (RF)
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
Temperature Rating N/A -20 to 450 ºF N/A -460 to 450 ºF N/A -20 to 450 ºF N/A -460 to 450 ºF N/A -20 to 450 ºF
Cv N/A 65 N/A 65 N/A 65 N/A 51 N/A 51
Other N/A API PED
Applications 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
Hardware N/A A194-B7, A194-2H
  • 1 Soft seats are available for bubble-tight shutoff.
  • 2 Inconel® 750 spring is available.
  • 3 Contact DFT for stainless steel or other bolting materials.
  • 4 Contact DFT for other gasket materials.
    CFG - 316 graphite material.
  • 5 TFE-Viton : Teflon Encapsulated Viton
  • 6 Consult DFT for availability
  • 7 Contact DFT for NACE.