DFT® Inc
DFT® Inc
140 Sheree Blvd. PO Box 566
Exton, PA 19341-0566
Phone: 800.206.4013
Fax: 847.540.1422
Email: dft@dft-valves.com
Website: www.dft-valves.com
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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

Standard Features:
  • 1/4" to 2 1/2" Line Size
  • Higher Cracking Pressures (2 to 40 psi)
  • 450 to 2500 CWP
  • Threaded Ends
  • Stainless Steel Construction
  • Spring-Assisted Silent Closing
  • Horizontal or Vertical Installation
  • Tight Shutoff - Lapped Disc & Seat
Restrictor Threaded In-Line Check Valves
Unit of Measure
Items Restrictor Threaded In-Line Check Valves
5642
1/4" 10.9 psig Restrictor Threaded In-Line Check Valve 		Restrictor Threaded In-Line Check Valves
5650C204
1/8" 20.4 psig Restrictor Threaded In-Line Check Valve 		Restrictor Threaded In-Line Check Valves
5641
1/4" 8.1 psig Restrictor Threaded In-Line Check Valve 		Restrictor Threaded In-Line Check Valves
5639
1/4" 3.3 psig Restrictor Threaded In-Line Check Valve 		Restrictor Threaded In-Line Check Valves
5640
1/4" 5.3 psig Restrictor Threaded In-Line Check Valve
Series N/A Restrictor Check
Outside Thread (MNPT) B N/A 1.00 in
Friction Loss (Feet of Pipe) N/A 7
Friction Loss (Meter of Pipe) N/A 2.1
Valve Cracking Pressure N/A 10.9 psi0.752 bar N/A 20.4 psi1.407 bar N/A 8.1 psi0.558 bar N/A 3.3 psi0.228 bar N/A 5.3 psi0.365 bar
Cold Working Pressure N/A 0 psig2500 psig
Valve Cracking Pressure Tolerance N/A ±10%
Approx. Net Weight Each N/A 0.38 lb
Seat N/A 303 SS
ENDS N/A NPT (Threaded)
Disc N/A 316 SS
Guard N/A 303 SS
Spring N/A 302 SS
Retaining Ring N/A 316 SS
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)
ANSI N/A B1.20.1
MSS N/A SP-25
ASTM2 N/A 303 SS not acceptable for CRN
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
  • 1 Buna-N and Viton are not suitable for steam service.
  • 2 CRN: Contact DFT for acceptable materials.