Description Control valve ZK 313 with ZK radial stage nozzle® designed for reducing high differential pressures in industrial installations and power plants and used as:? Injection-cooling valve? Warm-up valve? Drain valve? Steam control valveAll internals are exchangeable. Leakage rating Class VI acc. to ANSI FCI 70-2-2003. For equipment in sizes 1" – 3" two body types are available: straight-through and angle pattern. The body of equipment sizes 4" – 6" is hammer forged and of the angle or Z-type. A sampling valve is available as optional extra on request