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The DFT® Model SCV® is a corrosion resistant, dependable, versatile and economical spring-assisted, in-line check valve for a wide range of applications. Whether the fluid is liquid, gas or steam, the SCV® provides tight shut-off and protects other equipment in the system from water hammer. Its stainless steel construction insures a long service life.
Unit of Measure

OLD NPT #

OLD PART #

 N/A 8311-54

Specifications

Series

 N/A SCV®

Size

 N/A 3.00 inDN 80

ASME CLASS

 N/A 300

Cold Working Pressure

 N/A 0 to 750 psig0 to 51.7 barg

Working Steam Pressure

 N/A 500 psig

Dimension A

 N/A 6.75 in171 mm

Dimension B

 N/A 6.19 in157 mm

Weight

 N/A 18.8 lb8.5 kg

Cracking Pressure CP

 N/A 0.2 psig0.014 bar

Trim

 N/A 316 SS
Temperature Rating1
N/A 37 to 470 ºF3 to 243 ºC

B (Dia.)

 N/A 6.19 in157 mm
ENDS2 N/A Threaded NPT

Cv

 N/A 180

Materials of Construction

Body

 N/A A351 CF8M

Body Material

 N/A A351 CF8M
Seat3 N/A A351 CF8M/Zelon®

Spring

 N/A Inconel® X-750

Body Seal

 N/A Zelon®

Available Soft Seat Materials

Available Soft Seat Materials

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

Codes and Standards

ANSI

 N/A B1.1 B1.20.1 B16.34

MSS

 N/A SP-126 SP-25 SP-61
ASTM4 N/A A351GR CF8M

Features

N/A

  • 1/2" to 3" Line size
  • 750 & 3600 CWP
  • NPT & SW ends
  • Stainless Steel Construction
  • Inconel® X-750 spring
  • Spring-assisted silent closing, non-slam
  • Zelon® body "O" ring body seal
  • Horizontal or vertical installation
  • Body guided disc
  • Tight shut-off - lapped disc & seat
  • Simplified construction - 5 parts
  • Easy maintenance
  • Versatile

Options

N/A

  • 316 SS Springs
  • Body seal weld (700°F Maximum)
  • Soft seat
  • Alloy 20 body & seat (ASME 300)
  • Hastelloy C body & seat (ASME 300)
  • Socket weld ends
  • SCV-R restrictor check (higher cracking pressure)
  • Butt weld ends
  • NACE
  • Light cracking pressure springs

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

Inventory

Inventory

 N/A {0}
  • 1 ASME B16.34-2004
  • 2 NPT x SW available.
  • 3 Soft seats are available for bubble-tight shutoff. Body seal and soft seat material are the same unless otherwise requested.
  • 4 Contact DFT for NACE.