The Herz differential pressure controller, identified by part number GHYANE (also 1420241), is engineered for precise regulation in heating and cooling systems. This robust controller features a DN15 nominal diameter and 1 1/2 inch external thread connections, ensuring compatibility with standard installations. Constructed from dezincification-resistant brass, it offers superior durability and reliability. It operates effectively within a differential pressure range of 0.05 to 0.25 bar, with a maximum operating temperature of 110 °C and a maximum operating pressure of 16 bar. The controller boasts a kvs value of 2.5 m³/h, providing efficient flow control.