Seals

SEALS

For the standard parts which are listed in Hygienic Design, the seals have the central function of protecting dead spaces, gaps and cracks from the penetration of cleaning fluids or product residues.

For this, a defined pre-tension or pressing of the seals and lower seal is necessary for a reliable and permanent seal in the installed condition. Within the Hygienic Design product family, seal installation spaces and seal cross sections are calculated and designed with simulation software, so that the necessary surface compression is achieved on installation and the seal ma-terial is not subjected to excess pressure.

A fundamental differentiation can be made between static and moving seals.

• Static seals. The pressure is achieved by tightening. It should be ensured that all surfaces which make contact with the ring have a surface finish of at least Ra 0.8 µm.
• Moving seals. They are designed to allow adjustment in both height and angle, ensuring a gap-free, pre-tensioned seal. With the example of a LM.F-HD-SST levelling elements-Hygienic Design, the illustrated design shows how the various seal con-figurations can be designed.