Model 990.12

Flanged Process Connection, Diaphragm Seals

Threaded Design

Selected documents
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Applications

  • Suitable for corrosive, contaminated, highly viscous or hot pressure media
  • Chemical process industry
  • Petrochemical industry
  • High process pressures

Special Features

  • Flanged process connection per EN/ASME DN 15, 20, 25 or DN (NPS) ½", ¾", 1"
  • Design with internal diaphragm and diaphragm bed, upper and lower housing threaded
  • Wide variety of special materials

Description

Pressure rating
PN 25 ... 250 resp. class 150 ... 1500

Suitable pressure ranges
0 ... 0.6 bar to 0 ... 250 bar

Upper housing (instrument connection)
Material stainless steel 316 L, G ½ female

Diaphragm
Material stainless steel 316 L, welded with upper housing
Effective diameter of diaphragm Mb = 52 mm

Sealing ring
FPM (Viton®) max. 200 °C

Lower housing (process connection)
Material stainless steel 316 L
Flanges DN 15, 20, 25 following EN 1092-1, sealing face form B1 or NPS ½", ¾", 1" per ASME B 16.5, RF 125 ... 250 AA

Fastening parts
Retainer flange, hexagonal bolts and nuts:
galvanised steel max. 200 °C

Optional extras

Upper housing (instrument connection)

  • Stainless steel 1.4571, 1.4541, titanium
  • Capillary extension (welded with upper housing)
  • Cooling tower for directly mounted gauge when fluid temperature > 100 °C

Diaphragm

  • Stainless steel 1.4571, 1.4435, 1.4539, 1.4541, 1.4462
  • Hastelloy B3, C4, C276, Monel 400, Nickel, lnconel 600,
  • lncoloy 825, tantalum, titanium, zirconium (upper housing titanium)
  • Silver foil max. 150 °C
  • PTFE foil max. 260 °C ≤ 100 bar
  • PFA coating max. 260 °C
  • ECTFE (Halar®) coating max. 150 °C
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