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The DFT® Restrictor Check Valve (RCV) is a versatile, all-purpose, spring-assisted, in-line check valve for applications that require higher cracking pressures to open the check valve than those offered by other DFT® check valves. Cracking pressures are available from 2 to 40 psi. Like the Basic-Check® valve, the Restrictor Check provides reliable, low maintenance service for a wide range of fluids and gases at various pressure/temperature combinations. The valve consists of a guard cage, spring, valve disc, retaining ring and seat. It can be combined with pipe fittings such as couplings, drain elbows, etc. (not provided by DFT®) to form a complete check valve unit ideally suited for a broad range of applications. The RCV should not be considered a substitute for a Pressure Relief Valve.
Not recommended for use on discharge of reciprocating compressors.

Warning: Use with extra deep, bell reducer only.
Unit of Measure

Inventory

Inventory

 N/A {0}

Specifications

Series

 N/A Restrictor Check

Outside Thread (MNPT) B

 N/A 4.00 in

Friction Loss (Feet of Pipe)

 N/A 16

Friction Loss (Meter of Pipe)

 N/A 4.9

Valve Cracking Pressure

 N/A 4.6 psi0.317 bar

Cold Working Pressure

 N/A 0 psig450 psig0 barg31.0 barg

Valve Cracking Pressure Tolerance

 N/A ±10%

Approx. Net Weight Each

 N/A 7.00 lb3.2 kg

ENDS

 N/A NPT (Threaded)

Materials of Construction

Seat

 N/A 303 SS

Disc

 N/A 316 SS

Guard

 N/A CF8M

Spring

 N/A 302 SS

Retaining Ring

 N/A 316 SS

Available Soft Seat Materials

Available Soft Seat Materials1 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 B1.20.1

MSS

 N/A SP-25
ASTM2 N/A 303 SS not acceptable for CRN

Features

N/A

  • Higher cracking pressures (2 to 40 psi)
  • 1/4" to 2 1/2" Line size
  • 450 to 2500 CWP
  • Threaded ends
  • Stainless Steel Construction
  • Spring-assisted silent closing
  • Horizontal or vertical installation
  • Tight shut-off - lapped disc & seat
  • Easy maintenance
  • Versatile

Options

N/A

  • Soft seat

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 Buna-N and Viton are not suitable for steam service.
  • 2 CRN: Contact DFT for acceptable materials.