Primary / Secondary frictional connection  

In the conventional primary joint (left picture) the connection force of flanges is transmitted through the sealing material. 

The secondary frictional connection (right picture) bypasses the introduced force exceeding a definite limit around the gasket so that the laload is subjected to a defined pressing force, and the applied excessive force is exclusively effective as connecting force of metallic components. 

This system is described in detail in a separate brochure.

Spring loaded sealing systems for flanges

Flange gaskets must always be subjected over a minimum surface pressure to maintain the needed sealing effect. The mathematical proof can be carried out relatively accurately with the available calculation methods.

However, the disadvantage of these calculation models is that the calculation can only be carried out precise for static states. The calculation of changing states as the heating up or cooling down phase is less precise. 

One way to maintain the required sealing pressure is to use spring washers. Their effect is independent of the thermal expansion, since the power transmission of a spring washer takes place via its geometry and not via a change in temperature.  

Spring-loaded sealing systems for shaft sealings

The aim of spring loaded systems for valves is to improve them with regard to their tightness, service life and functionality. The main focus is on maintaining the required sealing pressure throughout the entire operating period. 

For this purpose, spring columns are used as additional components, which act on the packing over a defined deflection and with a deflection force adapted to the operating conditions.

The optimized packings consist of a clamp-fitting (first and last ring) and the sealing zone in between. The additional spring columns keep the sealing force largely constant over a defined deflection way. When the packing is placed, the cover of the spring columns are sitting on the shell surrounding the springs, so that a visible gap is created as an indicator that the spring columns need to be tightened. The bolts do not need to be replaced because the extension is already integrated into the spring columns.