The Herz 2421789 GMW DN 15MF is a genuine Herz automatic circuit balancing valve designed for precise and constant volume flow regulation in heating, cooling, and ventilation systems. Constructed from dezincification-resistant brass (DR brass), this high-quality valve ensures durability and reliable performance. It features a DN 15 (1/2 inch) internal female thread connection according to EN 10226-1, suitable for various pipe installations. With a nominal pressure rating of PN 16 bar and an operating temperature range up to 110 °C, it provides stable flow control within an adjustment range of 0.08 to 0.28 m³/h. Ideal for maintaining hydraulic balance and energy efficiency in complex building services.