HERZ-Flow Controller with Integrated Control Valve made of cast iron GG 25 with male thread fl at seal, PN 16. Suitable for controlling the fl ow rate in cold and hot water dystems. Max. differential pressure 10 bar. Diff. pressure accross the restrictor 0.2 bar. Temperature range: 5°C to 130°C Gasket material FPM Cones, stem, seat material WN1.4057, WN1.4404, WN1.4021 Impulse tupe WN1.4301 Diaphragm material EPDM.