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® Basic-Check® Valve is a versatile all-purpose, non-slam valve that provides reliable, low-maintenance service for a wide range of liquids, steam 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 reducing couplings, drain elbows, etc. to form a complete check valve unit ideally suited for a broad range of pipeline applications or incorporated into machinery for OEM applications. The metal-to-metal sealing area of the Basic-Check® valve’s disc and seat is precision-lapped, providing very tight shutoff of gas, steam and liquid. If bubble-tight shutoff is required, optional resilient soft seats are available.

Standard Features:
  • 1/4" to 2 1/2" Line Size
  • 450 to 6000 CWP
  • Threaded Ends
  • Stainless Steel Construction
  • Spring-Assisted Silent Closing
  • Horizontal or Vertical Installation
  • Tight Shutoff - Lapped Disc & Seat
  • Easy Maintenance
Unit of Measure

Inventory

Inventory

 N/A {0}

Specifications

Series

 N/A Basic-Check®

Size

 N/A 2.50 in

Line Size Inlet (FNPT) A

 N/A 2.50 in

Outside Thread (MNPT) B

 N/A 4.00 in

Style

 N/A BSS
Cold Working Pressure1 N/A 450 psig

Working Steam Pressure

 N/A 350 psig

Friction Loss (Feet of Pipe)

 N/A 16

Friction Loss (Meter of Pipe)

 N/A 4.9
Valve Cracking Pressure2 N/A 0.1 psi0.007 bar2.6 in.water

Valve Cracking Pressure Tolerance

 N/A ±10%

Approx. Net Weight Each

 N/A 7.00 lb

Temperature Rating

 N/A -75 to 300 ºF-59.44 to 148.89 ºC

ENDS

 N/A NPT (Threaded)

Cv

 N/A 90

Materials of Construction

Seat

 N/A 303 SS/EPDM

Disc

 N/A 316 SS

Guard

 N/A CF8M

Spring

 N/A 316 SS

Retaining Ring

 N/A 316 SS

Available Soft Seat Materials

Available Soft Seat Materials3 N/A Buna-N (-70 to 250ºF) EPDM (-75 to 300ºF) TFE®-Viton® (-40 to 400ºF) Viton® (-40 to 400ºF) Zelon® (37 to 450ºF)

Codes and Standards

ANSI

 N/A B1.20.1 B16.11

MSS

 N/A SP-25

Features

N/A

  • 1/4" to 2 1/2" Line size
  • 450 to 6000 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

  • Inconel® 750 Spring
  • 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 Contingent on service ratings of matching pipe and fittings.
  • 2 Cracking pressure for vertical flow will be slightly different: upward flow, slightly higher; downward flow, slightly less.
    Not recommended for use on discharge of reciprocating compressors.
  • 3 Soft seats are not available for the Style BSE check Valve. Buna-N and Viton are not suitable for steam service.