The control valves are tested by the German Technical Inspec- torate (TÜV) according to DIN EN 14597 and have been defined as shut-off and control devices. The standard version of the valve is suitable for water and steam up to 220 °C and the version with an insulating section up to 350 °C at operating pressures listed in Technical data (Table 1) and at a maximum permissible ambient temperature of 50 °C. In safety circuits, a strainer (e.g. Type 2 NI according to Data Sheet u T 1015) must be installed in the direction of flow upstream of the con- trol valve.