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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.
Unit of Measure

Inventory

Inventory

Specifications

Series

 PDC®

Size

 3.00 inDN 80

Cold Working Pressure

 740 psig

Working Steam Pressure

 620 psig

ASME CLASS

 300

Dimension A

 12.5 in318 mm

Dimension B

 8.25 in210 mm

Weight

 50 lb22.7 kg

Cracking Pressure CP

 0.62 psig0.043 bar

Trim Material

 316 SS
Available Soft Seat Materials1 Buna-N (-70 to 250ºF) EPDM (-75 to 300ºF) TFE®-Viton® (-40 to 400ºF) Viton® (-40 to 400ºF) Zelon® (37 to 470ºF)

Disc/Stem Assembly

 316 SS

ENDS

 Flanged (RF)

Cv

 148

Temperature Rating

 37 to 450 ºF2.78 to 232.22 ºC

Hardware

 Stainless Steel

Materials of Construction

Body

 A216 Grade WCB

Body Material

 Carbon Steel
Seat2 Zelon®
Spring3 316 SS

Spring for Ball check

 Inconel® X-750

Bushing

 Rulon®

Seal Ring

 Teflon®/Hastelloy® C276

Spring Retainer - Ball Check

 A479 316

Guide Ring

 Teflon

Ball Check

 440C SS

Orifice Plug

 A479 316
Body Seal4 Durlon 9000

Codes and Standards

ANSI

 B16.10 B16.20 B16.34 B16.5

MSS

 SP-126 SP-25 SP-6 SP-61

ASTM

 A216GR WCB A351GR CF8M CRN NACE

Other

 API 6D API PED

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
  • Meets API 6D

Options

N/A

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

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.