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Find My Check Valve
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.

750 CWP is rated to 470ºF.
3600 CWP is rated to 400ºF.
Buna-N CO2 resistant "O" ring is available upon request.
Unit of Measure

OLD NPT #

OLD PART #

 8373A20

Inventory

Inventory

Specifications

Series

 SCV®

Size

 1.50 inDN 40

ASME CLASS

 300

Cold Working Pressure

 750 psig51.7 barg

Working Steam Pressure

 500 psig

Dimension A

 4.75 in121 mm

Dimension B

 3.44 in87 mm

Weight

 4.7 lb2.1 kg

Cracking Pressure CP

 0.24 psig0.017 bar

Trim

 Hastelloy C
Temperature Rating1
37 to 470 ºF3 to 243 ºC

B (Dia.)

 3.44 in87 mm
ENDS2 Socket Weld

Cv

 54

Valve Type

 Check Valve

Materials of Construction

Body

 A351 CN7M

Body Material

 Alloy 20
Seat3 A351 CN7M

Disc

 Alloy 20

Spring

 Hastelloy C276

Body Seal

 Zelon® (470ºF max.)

Available Soft Seat Materials

Available Soft Seat Materials

 Seal Weld (-425 to 700ºF) TFE®-Viton® (-40 to 400ºF) Viton® (-40 to 400ºF) Zelon® (37 to 470ºF)

Codes and Standards

ANSI

 B1.1 B1.20.1 B16.34

MSS

 SP-126 SP-25 SP-61
ASTM4 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

Valve Selection Chart

ASME CWP

 750

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 ASME B16.34
  • 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.