Pressure equalisation valve
According to VGB 112, pneumatically fillable silos and tanks must be fitted with overpressure / low pressure protection. The Mahr pressure equalisation valve is supplied in the nominal diameter DN 200.
The response pressure is adjusted using sliding weights. The low pressure can be set to between 5 and 13 mbar and the overpressure to max. 40 mbar.
The low-cost alternative is a DN 250 spring loaded overpressure / low pressure protection device