Flanged Swing Check Valve S6 Series Flanged Swing Check Valve, Valve body made of cast iron, in strict accordance with the relevant product standards, in line with EN ISO 9001 standards. Product Description: S6 Series Flanged Swing Check Valve, Valve body made of cast iron, in strict accordance with the relevant product standards, in line with EN ISO 9001 standards. Scope: Suitable for heating, air conditioning systems, water treatment, water supply systems, agricultural and industrial systems. Can be installed horizontally, low head loss. Not suitable for steam and gas systems. Diameter: DN40-800