Product passages are smooth and the special seals ensure thorough cleaning.Unique metallic stop prevents the valve flanges from being tightened too much and protects the valve seal from mechanical over-stress thus improving seal lifetime.One actuator covers all diameters from 1? (25 mm) - 4? (100 mm).Slide bearings on the pivots of the discs increase operating reliability.Visual indication of open/closed position.SVS1F intermediate flange design allows simple removal and easy access of valves that are in lengthy or fixed pipelines.ATEX compliant modelsDesigns with electro-pneumatic control (flow control) with Bürkert positionerSV1 valves are available from DN 25 DN 150, 1 4.SVS1F valves are available from DN 25 to DN 250, 1” – 6” OD, 2”- 6” Sch5