Find My Check Valve
The DFT® Model PDC Silent Check Valve is specially designed for use on the discharge side of reciprocating air or gas compressors. It includes a pulse damping chamber to maintain the disc in the open position during the momentary reductions in flow associated with each cycle of a reciprocating compressor and to protect against premature seat wear.

Notes
  • Contact DFT® for pricing and availability of RTJ ends
  • Zelon® - Teflon Encapsulated Viton
  • Rulon®, Teflon®/Hastelloy®; C276, Teflon- 500°F maximum.
  • "Low Temp Carbon Steel": Add $200 NET per line item for required Charpy Test.
  • Teflon Encapsulated Viton
Unit of Measure

Specifications

Series

N/A PDC®

ASME CLASS

N/A 600

Size

N/A 3.00 inDN 80

Dimension A

N/A 14 in356 mm

Dimension B

N/A 8.25 in210 mm

Weight

N/A 58 lb26.3 kg

Cracking Pressure CP

N/A 0.046 bar0.66 psig
Available Soft Seat Materials1 N/A Buna-N (-70 to 250°F) EPDM (-75 to 300°F) TFE®-Viton (-40 to 400°F) Viton® (-40 to 400°F) Zelon® (37 to 400°F)

ENDS

N/A FLG (RF)

Cv

N/A 142

Materials of Construction

Body

N/A A352 LCC

Body Material

N/A Low Temp. Carbon Steel

Disc

N/A A351 CF8M
Seat2 N/A A351 CF8M
Spring3 N/A A313 316 (450°F max.) Option

Spring for Ball check

N/A Inconel® X-750

Disc Guide

N/A A479 316

Bushing

N/A Rulon®

Seal Ring

N/A Teflon®/Hastelloy® C276

Spring Retainer - Ball Check

N/A A479 316

Guide Ring

N/A Teflon

Ball Check

N/A 440C SS

Orifice Plug

N/A A479 316
Body Seal4 N/A 316 / Flexible Graphite

Codes and Standards

ANSI

N/A B1.1 B16.10 B16.20 B16.34 B16.5

MSS

N/A SP-126 SP-25 SP-6 SP-61

ASTM

N/A A216GR WCB A351GR CF8M CRN NACE

Other

N/A CRN NACE

Options

Options

N/A Inconel® X-750 NACE Soft Seat X-750 Spring

N/A

  • Soft seat
  • Inconel® X-750 Spring (500°F max due to non-metallic components)
  • Monel trim
  • NACE

Features

N/A

  • Pulse damped design
  • Modulating "air" or "gas" applications:
    - Discharge of reciprocating air/gas compressors
    - Self sizing - accommodates varying flows without chattering
  • Mediums:
    - Air
    - Gas
  • ASME B16.10 Face-to-Face dimensions
  • One piece body
  • Spring-assisted silent closing
  • 2" to 12" Line size
  • ASME 150 to 1500
  • WCB, SS & LCC body
  • SS trim
  • SS spring (450°F max)
  • Ends:
    - RF Flanged
    - RTJ
  • Center guided
  • Horizontal or vertical installation
  • Tight shut-off
  • Protected spring
  • Easy maintenance
  • Versatile
  • Axial flow
  • Nozzle style

Application

N/A Compressor Discharge Metering Pumps Process Lines Pump Discharge Refrigeration

  • 1 Teflon Encapsulated Viton
  • 2 Soft seats are available for bubble-tight shutoff.
  • 3 Inconel X-750 spring is available. (500°F maximum)
  • 4 Contact DFT for other materials.