Model 990.FR

Flanged Process Connection Diaphragm Seal

Threaded Design

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

Special Features

  • Flanged process connection per DN (NPS) 1", 1½", 2", 3", 4"
  • Design with internal diaphragm and diaphragm bed, upper and lower housing threaded
  • Wide variety of special materials


Pressure rating
PN 25 ... 40 resp. class 150 ... 600

Suitable pressure ranges
0 ... 15 psi to 0 ... 1000 psi

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

Material stainless steel 316 L, welded with upper housing

Process Connection
ASME B 16.5, 1½" to 4"

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 > 212 °F


  • Stainless steel 316TI, 316, 904L, 321
  • Hastelloy B3, C276, Monel 400, Nickel, lnconel 600,
  • lncoloy 825, tantalum, titanium
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