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Threaded Process Connection Diaphragm Seals

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Threaded Process Connection Diaphragm Seals

Plastic Design
Model No: 990.31

All-plastic design


Process connection with thread for direct mounting, but also suitable for bonding (PVC-U) or welding (PP, PVDF)


Pressure rating PN 10 (with water, 20 °C)

Suitable pressure ranges 0 ... 1 bar to 0 ... 10 bar not suitable for + / - ranges and vacuum ranges

Operating pressure and process temperature See also diagram pressure-temperature rating on data sheet

Upper housing (instrument connection) G ¼ female G ½ female

Material: PP (polypropylene), fibre-glass reinforced, blue RAL 5022

Diaphragm with sealing ring EPDM, with PTFE foil on the medium side

Lower housing (process connection) d 25, G ¼ female (optional ¼ NPT) d 32, G ½ female (optional ½ NPT)

Material: PVC-U (polyvinyl chloride), grey RAL 7011 PP (polypropylene), grey-beige RAL 7032 PVDF (polyvinylidene fluoride), opaque, yellowish white

Multi-purpose connection, optionally via threaded neck, bonding neck (PVC-U) or welding neck (PP, PVDF)

Mounting position any position possible, preferably measuring instrument on top


Process instrumentation in chemical plants

Plating industry

Waste water treatment

Fertiliser industry