Series R The Serie R valve is Mecafrance most common used manual operated, 3 piece ball valve for general industrial applications. This range is available from DN 8 to DN 250, in pressure ratings up to PN 100, and temperatures ranging from -40 to +450 ˚C, in function of the selected materials. Each R valve features the swing-out design allowing easy maintenance on sealing components without taking the valve completely from the line. Butt weld, treaded, socket and double flanged ends are available. Serie R valves are over the years awarded with a large spread of international approvals, such as for example API 609/6D, BS 6755.