Tritium (³H) and Gas Containment: Why Bellows Valves Are the Reference Solution

A Gas That Leaves No Room for Compromise

Tritium's very high diffusivity means it can permeate materials where other gases would remain contained. Conventional dynamic seals, stuffing box membranes or friction-exposed O-rings, represent potential weak points. 

In a nuclear environment, even the smallest leak is unacceptable: it puts site safety, regulatory compliance, and operator protection at risk.

The Bellows Valve: Sealing Without Compromise

Against these constraints, the bellows valve has established itself as the reference solution. Its design eliminates the dynamic seal at the stem: the opening and closing motion is transmitted through a welded metal bellows, ensuring near-absolute tightness between the fluid and the external environment.

Concrete advantages in a tritium context:

• No dynamic leakage: the bellows does not rub, it deforms elastically, with no contact wear.
• Full material compatibility: materials in contact with the fluid are selected for their resistance to permeation and radioactive environments.
• Reduced contamination risk: controlled tightness limits operator exposure and contamination of adjacent circuits.
• Long-term reliability: in environments where maintenance is constrained by radiological dose rates, the durability of the solution is a non-negotiable requirement.
• Enhanced safety: bellows valves meet the highest performance and regulatory compliance standards in force in the nuclear industry.

Rotarex's Commitment to Nuclear Applications

Rotarex designs and manufactures bellows valves dedicated to tritium containment, developing solutions adapted to these critical environments. Mastering gas fluid handling under extreme conditions (whether pressure, temperature, or radioactivity) is at the core of Rotarex's expertise.

As nuclear fusion establishes itself as one of the most promising pathways for tomorrow's energy, securing the infrastructure that makes it possible is a priority. Rotarex bellows valves are contributing to that goal today.