Unit verification protocols

Each batch of plastic and elastomeric components undergoes dimensional checks to verify that threaded connections and press fits match original technical drawings. This inspection prevents play during repetitive running movements.

Valve seat check

The elastomeric membrane must sit flat against the rigid polycarbonate base.

• Seal testing: Light negative pressure is applied to confirm that the one-way valve prevents backflow.
• Source traceability: Each plastic component comes from batches with documented polymer composition and free of phthalates.

Impact on regular practice

A uniformly calibrated valve ensures that the resistance felt by the user corresponds to the level selected on the numbered dial without unexpected fluctuations.