Technical information

Clamping Options

5 4 3

In the clamping zone, the diaphragm is fastened between the housing flanges under sufficient pressure (thread-fastening, clamping). The diaphragm in this case acts like a static seal. Deformation damage caused by excessive clamping pressures must be avoided through flange stops and/or specified torque levels. Depending on the diaphragm material and diaphragm thickness, additional flat or profile seals may be used for sealing. With PTFE diaphragms, sealing performance can be improved by a V-profile surface structure of the respective assembly components, meaning the V-profile structure of the housing or supporting parts is pushed into the PTFE, resulting in improved sealing performance.
Design and Clamping zone

Diaphragm with Bead
2

Flat Diaphragm
1

For mechanical articulation, the diaphragm is typically clamped between the supporting and the pressure disc. The individual components are joined by a threaded connection, riveting or vulkanized. When designing the support, it must be ensured that the surfaces contacting the diaphragm are burr-free and that there are sufficiently dimensioned transition radii.

General rule: R ≥ 4 x s

  • R = radius
  • s = diaphragm thickness

Dimensioning Legend for Engineering Drawings

  • DAØ outside
  • DW Ø eff
  • b (radial bead width)
  • S (membrane thickness in the bead area)
  • P (pressure)
  • Hmax (maximum lift)
  • R (radii at the transition points)