Pressure relief valves SDD 912 limits the static pressure to a constant and maximal settled value by opening the outlet (to the discharge line) when the pressure is overriding. The right angle concept allows small dimensions with a reduced weight for easiest fitting on line than any conventional in-line straight pressure relief valve. All wetted parts are in plastics; without any metallic parts exposed to the atmosphere it allows a location in corroding vapours.

The SDD 912 valves may be used as pressure relief valves on volumetric pumping system. These equipment protection devices havr to be fitted on by-pass.