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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.

 

Standard Features:

  • 2" to 26" Line Size
  • ASME Class 150 to 1500
  • Standard Body Materials:
    • Carbon steel
    • Stainless steel
  • Stainless Steel Trim
  • Stainless Steel Spring
  • Ends available in RF Flanged & RTJ
  • Pulse-Damped Design
  • Horizontal or Vertical Installation
  • Center Guided Trim
  • Meets API 6D
  • ASME B16.10 Face-to-Face Dimensions
  • One-Piece Body
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Unit of Measure
Items
PDC® Flanged Check Valves

A216 WCB 2" 316 SS Class 150 RF PDC® Flanged Check Valve
PDC® Flanged Check Valves

A216 WCB 2" 316 SS Class 300 RF PDC® Flanged Check Valve
PDC® Flanged Check Valves

A216 WCB 2" 316 SS Class 600 RF PDC® Flanged Check Valve
PDC® Flanged Check Valves

A216 WCB 2" 316 SS Class 900 RF PDC® Flanged Check Valve
PDC® Flanged Check Valves

A216 WCB 2" 316 SS Class 1500 RF PDC® Flanged Check Valve
Series N/A PDC®
Size N/A 2.00 inDN 50
Cold Working Pressure N/A 285 psig N/A 740 psig N/A 1480 psig N/A 2220 psig N/A 3705 psig
Working Steam Pressure N/A 185 psig N/A 620 psig N/A 1235 psig N/A 1855 psig N/A 3090 psig
ASME CLASS N/A 150 N/A 300 N/A 600 N/A 900 N/A 1500
Dimension A N/A 8 in203 mm N/A 10.5 in267 mm N/A 11.5 in292 mm N/A 14.5 in368 mm N/A 14.5 in368 mm
Dimension B N/A 6 in152 mm N/A 6.5 in165 mm N/A 6.5 in165 mm N/A 8.5 in216 mm N/A 8.5 in216 mm
Weight N/A 20 lb9.1 kg N/A 27 lb12.2 kg N/A 30 lb15.9 kg N/A 65 lb29.5 kg N/A 65 lb29.5 kg
Cracking Pressure CP N/A 0.41 psig0.028 bar N/A 0.49 psig0.034 bar N/A 0.41 psig0.028 bar N/A 0.35 psig0.024 bar N/A 0.35 psig0.024 bar
Body N/A A216 Grade WCB
Body Material N/A Carbon Steel
Trim Material N/A 316 SS
Seat1 N/A 316 SS
Spring2 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 Seal3 N/A Durlon 9000 N/A Durlon 9000 N/A 316 SS / Flexible Graphite N/A Spiral Wound Graphite N/A 316 SS / Flexible Graphite
Available Soft Seat Materials4 N/A 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 N/A 316 SS
ENDS N/A Flanged (RF)
ANSI N/A 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 N/A A216GR WCB A351GR CF8M CRN NACE N/A A216GR WCB A351GR CF8M CRN NACE N/A A216GR WCB A351GR CF8M CRN NACE N/A A216GR WCB A351GR CF8M CRN NACE
Other N/A API 6D API PED
Cv N/A 62 N/A 62 N/A 62 N/A 55 N/A 55
Temperature Rating N/A -20 to 450 ºF-28.89 to 232.22 ºC
Applications N/A Compressor Discharge Metering Pumps Process Lines Pump Discharge Refrigeration
Hardware N/A Stainless Steel
Note N/A
  • Contact DFT® for pricing and availability of RTJ ends
  • Zelon® - Teflon Encapsulated Viton
  • Rulon®, Teflon®/Hastelloy®; C276, Teflon® - 500 ºF maximum.
  • Teflon® Encapsulated Viton
  • PDC temperature rating is limited by the spring material and nonmetallic components.
  • 1 Soft seats are available for bubble-tight shutoff.
  • 2 Inconel X-750 spring is available. (500°F maximum)
  • 3 Contact DFT for other materials.
  • 4 Teflon Encapsulated Viton