W9FF Wetted Flange
W9FF Wetted Flange
W9FFWR31S-DWD-AS-R2 on Foxboro IDP10
W9FFWR31S-B20-BH-RR on Yokogawa EJA110E
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Reotemp’s Flanged Flush-Face Diaphragm Seals are useful in applications where a continuous flow of process across the diaphragm is required to prevent solids buildup and a one-piece, all-welded construction is desired.

  • One-piece Seal Design Bolts Directly to Process Flange
  • Center Instrument Exit
  • Commonly Supplied with Flush/Calibration Ring
  • Ideal for Gauge or Differential Pressure Transmitters

Wetted Materials

Flange: 316SS, 304SS, Monel, Alloy 20, Hast C-276.
Diaphragm: 316SS, Hast C-276, Tantalum, Monel, others

Process Temperature Limits

-110° to 750°F

Ambient Temperature Limits

Determined by the Pressure Instrument

Minimum Recommended Pressure Ranges

Flange Size 1-1/2″ 2″ 3″ & 4″
2.5″ & 3.5″ Gauges 30 psi 15 psi 15 psi
4″, 4.5″, & 6″ Gauges N/A 60 psi 30 psi
Transmitter (Gauge Pressure) 10 psi 100 “H2O 30 “H2O
Transmitter (Differential Pressure) N/A 150 “H2O 30 “H2O

Maximum Working Pressure

Determined by ANSI B16.5 flange ratings.