Control valve
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Dear experts, is it necessary to mark the sub-gauge of the control valve with a red line? Thank you~~~
Are there any relevant regulatory documents?~~
Anyway, the safety supervision agency has never inspected this at the factory.
We didn’t attach one, because according to the classification of pressure gauges, air pressure gauges belong to the lowest category; they don’t require regular calibration – it’s sufficient to replace them in case of failure. It’s also useful to have one; it allows one to see at a glance that the normal pressure is around the red line.
The key is to determine what accuracy class the anemometer you are using belongs to; for anemometers without such an accuracy class, there is no need to mark them with a red line or to subject them to periodic calibration