Access

Valves with sealing bellows

A distinctive feature of rising stem control valves is that they have a critical external leakage point precisely at the dynamic stem-packing seal.

To minimize leakage in this area, a bellows seal can be used, optionally in combination with single or double packings, which act as a safety backup in case of bellows failure.

Bellows seals are particularly suitable for applications involving lethal, toxic, or especially costly fluids.

Advantages

  • Significant improvement of dynamic sealing in the stem area. Possibility to choose the bellows material to ensure optimum compatibility with the process fluid (e.g. Inconel, Monel, SS316L, etc.).

Disadvantages

  • The production of bellows for high pressures and/or long strokes can lead to a significant increase in production costs.
Want to download catalogue? Register here