Find My Check Valve
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

Specifications

Series

Excalibur®

Size

2.00 inDN 50

Cold Working Pressure

275 psig18.98 barg

Working Steam Pressure

180 psig

ASME CLASS

150

Dimension A

8.00 in203 mm

Dimension B

6.00 in152 mm

Weight

22 lb10 kg

Cracking Pressure CP

0.64 psig0.044 bar

Disc

316 SS
ENDS1 Flanged (RF)

Temperature Rating

37 to 450 ºF

Cv

65

Other

API PED

Hardware

A194-B7, A194-2H

Materials of Construction

Body

A351 CF8M

Body Material

316 Stainless Steel

Trim

316 SS
Seat2 Zelon®

Disc/Stem Assembly

316 SS
Spring3 Inconel® X-750

Bushing

316 SS
Bolting4 A193-B7 (Stud) & A194-2H (Nut)
Gasketing5 CFG

Available Soft Seat Materials

Available Soft Seat Materials6 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

B16.10 B16.20 B16.25 B16.34 B16.5

MSS

SP-126 SP-25 SP-6 SP-61
ASTM7 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.