A new range of Astra-Plus balancing valves have been introduced by the fluid control specialist ARI Armaturen (UK). These bellows-sealed valves feature metal-to-metal seating. This, combined with setting and resetting make these products suitable for process applications including high temperature water and thermal fluid systems. These valves are manufactured in modular iron (CGG-40.3), and can be supplied in nominal sizes from DN15 to DN400 diameters. A gland packed spindle seal is used on the DN250 and larger valves, together with a V-port plug design which can tolerate in excess of 2bar differential pressure. Maximum process fluid temperatures of up to 175C can be accommodated as standard, with an upper limit of 350C being possible on products to special order. Flange tappings are also provided to facilitate measurement using instruments.
