Types of diaphragm seals

Contents

Inline diaphragm seal

Inline diaphragm seal, sterile process connection NEUMO BioConnect (Series DF6100).

In tubular diaphragm seals, a cylindrical diaphragm is welded into a section of tubing. This eliminates any turbulence, flow obstructions, dead spaces and other hygiene risks. It should be noted, however, that the temperature error may be greater than with flat-diaphragm pressure transmitters. Inline diaphragm seals are available with all standard pipe connections.

Particular strengths

Easy to clean and self-draining. This makes it particularly suitable for applications requiring a dead-space-free design, frequent changes of fluid, and viscous media.

Highlights

  • Stainless steel body and flush mounted diaphragm
  • Special materials such as tantalum, titanium, Hastelloy, high-vacuum-resistant PTFE liners, etc.
  • Very low temperature influence
  • System fillings for various applications
  • Various device connections available

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Flat diaphragm seal

Flange-type diaphragm seal per EN and ASME (Series DA1120). Suitable for mounting to bourdan tube pressure gauges and pressure transmitters.

In flat pressure transmitters, the diaphragm lies in a single plane and is usually circular. This gives the diaphragm good spring characteristics, making the pressure transmitter less sensitive to temperature fluctuations. Furthermore, they are relatively simple to manufacture. Flat diaphragm seals are available with a wide range of connection options.

Particular Strengths

Applications requiring high accuracy or low pressures, as the flat diaphragm design offers good spring characteristics. A wide range of mounting options. Can be easily removed for cleaning or calibration.

Highlights

  • Hygienic designs with guaranteed surface roughness
  • Volume-optimised membrane bed
  • EHEDG-certified designs
  • System packings for various applications
  • Various instrument connections available

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