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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

 N/A {0}

Specifications

Series

 N/A PDC®

Size

 N/A 20.0 inDN 500

ASME CLASS

 N/A 900

Dimension A

 N/A 47 in1194 mm

Dimension B

 N/A 32 in813 mm

Weight

 N/A 4019 lb1823 kg

Cracking Pressure CP

 N/A 0.5 psig0.034 bar

Trim Material

 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)

ENDS

 N/A Flanged (RF)

Cv

 N/A 6780

Hardware

 N/A Stainless Steel

Materials of Construction

Body

 N/A A351 CF8M

Body Material

 N/A 316 Stainless Steel
Seat2 N/A Metal
Spring3 N/A 316 SS

Spring for Ball check

 N/A Inconel® X-750

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 SS / 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 API 6D CRN 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
  • 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

Note

Note

 N/A
  • Contact DFT® for pricing and availability of RTJ ends
  • Zelon® - Teflon Encapsulated Viton
  • Rulon®, Teflon®/Hastelloy®; C276, Teflon - 500 ºF maximum.
  • Low Temp Carbon Steel: Add $200 NET per line item for required Charpy Test.
  • Teflon Encapsulated Viton
  • PDC temperature rating is limited by the spring material and nonmetallic components.
  • 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.