The double-eccentric principle makes closing reliable as possible and nearly free from wear. Due to the double displacement of the shaft the valve disc is raised up from its seat at the beginning of the opening move. The seat is then free from heavy pressure over the whole circumference, this means that 90° turning is frictionless at even reduced torques. Due to these construction features an extremely high rate of operational functionality is achieved and maintained - also at a high frequency of operations.

The recommended flow direction (arrow on body) guarantees absolute tightness. The working pressure (differential pressure) of the medium also supports the function of sealing, pressing the seat against the sealing surface of the disc. The insert ring and the body protect the flexible seat with efficiency against negative flow conditions, even in case of flow and pressure changes the valve remains tight.

The seat is a functional part and very easy to reach and service, seat changing can be done on-site in a short space of time without the need of special tools.