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Threaded Connection Diaphragm Seal

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Threaded Connection Diaphragm Seal

Threaded Design Large Working Volume
Model No: 990.40

Internal diaphragm with large working volume

Special materials available

Low temperature error due to large diaphragm diameter (realisation of low measuring ranges possible)

Wide temperature application range due to large working volume

Integrated flushing connections (optional)


Process connection Thread

Nominal pressure PN 100 with diaphragm Ø 89 mm

Pressure ranges max. 0 ... 100 bar

Upper body Stainless steel 316L

Diaphragm Stainless steel 316L, welded with upper body

Sealing PTFE (up to a maximum of 260 °C)

Lower body (process connection) Stainless steel 316L, G ½, ½ NPT (female) G ½ B, ½ NPT or M20 x 1.5 (male)

Screws Stainless steel 1.4571

Measuring instrument connection Direct assembly (weld-in connection)


For assembly (direct assembly, via a cooling element or a capillary) with measuring instruments for low pressures and with differential pressure measuring instruments

For aggressive, contaminated or hot media

Filter monitoring

Level measurement