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Diaphragm In-Line Seals

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Diaphragm In-Line Seals

For Flange Connections, Flange Type
Model No: 981.27

Completely round, no corners and edges, European Patent No. 0629846

For direct installation between two flanges

Wide choice of special materials

Process connection for flanges following EN 1092-1 / ASME B 16.5 DN 25, 40, 50, 80, 100 or 1”?, 2”?, 3”?, 4”? Nominal size: see drawing and tables (DN) Sealing face, Form B1 or ASME RF 125 ... 250 AA

Pressure rating PN 16/40 or Class 150/300

Pressure ranges preferably mounted to pressure gauges NS 63, 100, 160 or pressure transmitters, Pressure ranges 0 ... 0.6 to 0 ... 40 bar

Body and material of wetted parts Stainless steel (AISI 316L)

Measuring instrument connection Pressure gauge or transmitter directly welded, process pressure transmitter with threaded adapter

Options Process connection

Larger nominal sizes

Other flange connections on request

Sealing faces per EN 1092-1, form B2 or per ASME B 16.5, RF 125 AA, 500 AA, RFSF; EN 1092-1 groove and tongue; projection and recess; ASME B 16.5 snap ring groove form RJF (limited for special materials, please request)

Flame arrester approved for Zone 0

Material of wetted parts

Staniless steel 1.4571, 1.4435, 1.4541, Monel, Hastelloy B3, C4, C22, C276, tantalum

PFA coating max. +260 °C

ECTFE (Halar®) coating max. +150 °C

Measuring instrument connection

Capillary, when ordering please specify: length of capillary

Cooling tower (for directly mounted gauge when fluid temperature > +140 °C)


Custom lengths between 1 and 15 m

Soft polyethylene or PTFE armour

For direct, permanent installation in pipelines

For flowing, pure and aggressive media

Chemical process industry

Petrochemical industry