Flanged valves for heating, cooling, district heating and air handling systems. The valves are designed for use with Regin RVAN actuators. Adapters are also available for use with other brands of actuators. The valves are primarily designed for district heating and replacement of the TAC valve STL. The valves (DN20 ... DN40 kvs 0.6-4.0) are also available in DIN length, then available as FRSD ..., eg FRSD32-1.6. The standard FRS DN15 valve is already DIN standard.