Scope of application: Closed and open water circuits (pH >7) Liquid temperature: 6...100°C (−10...6°C on request) Pipe connection: External thread G (ISO 228-1) Tightness Control branch: A – AB: airtight, tightness A (EN 12266-1) / bypass B – AB: tightness class I Flow characteristics: Regulation branch A – AB: equal percentage /bypass B – AB: linear (flow 70% of kvs value)