Diaphragm seal, welded design with screw-in tread

Type series DD8050

Diaphragm seal, welded design with screw-in tread - DD8050


  • Completely welded design
  • Suitable for pressure up to 200 bar
  • Volume optimised diaphragm base
  • Process connection G1/2 A and 1/2" NPT
  • System fillings for different applications
  • Measuring device connection: directly welded, directly screwed, with temperature decoupler, with capillary


  • NACE compliant
  • Oxygen free of oil and grease
  • Material certificate acc. to EN 10204-3.1

Technical Data

Constructional design / case
Design: - PN 60, max. pressure 60 bar at max. 200 °C
- PN 200, max. pressure 200 bar at max. 200 °C
  Higher pressure stages upon request.
Diaphragm: Flat diaphragm
Material wetted parts: Diaphragm: Stainless steel mat.-no. 1.4435 (316L), alternative Hastelloy C276.
Further materials upon request.
  Basic body: Stainless steel mat.-no. 1.4404/1.4435 (316L), alternative Hastelloy C276.
Further materials upon request.
Process connection
Design: G1/2 A per EN 837-1
1/2" NPT per EN 837-1
Sealing are not included in the scope of delivery.
Measuring device connection
See order details.
Material stainless steel mat.-no. 1.4301 (304)
System filling
See order details; further fillings upon request.
Further details about pressure transmission fluids see general technical information TA_038.
Temperature error
In order to optimise the system we provide a detailed error calculation upon request.
Without measuring device connection approx. 360 g (PN 200).
Further information about diaphragm seals see general technical information TA_031.
Flame arrester MF21xx for connection of measuring devices to zone 0 see data sheet D6-025.
Type series


  • D5-042-1

    Data sheet

  • TA_038

    Technical Information - Pressure Transmission Fluids