The S3 Pressure relief valve it`s used to maintain the pressure upstream of the valve to an adjusted set point.
When upstream pressure rises above a set point, the valve opens proportionally pressure rising.
This series of regulators is suitable for steam, gases (group 1 and 2) and liquids.
A relief pressure valve is not a safety valve, and then if necessary, an overpressure protection must be installed.

* Zoekterm: stoomwater, steam water, druk ventielen, pressure relief valve