It is necessary to perform and document a risk analysis for each new installation to refute the reproach of negligence in the event of damage. In certain areas, e.g. the separation of the operating or service water network from the public water supply, mixproof shut-off systems are required.
Wherever reliable separation of media is required and where the increased switching leakage compared to double seat mixproof valves and double seat valves can be com- pensated by the more economical price of the leakage butterfly valve.
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