Title: Spjeldventil.pdf
Before any service work on the final controlling device is carried out, it is essential to isolate the rotary actuator from the power supply (by unplugging the electrical cable if necessary). Any pumps in the part of the piping system concerned must also be switched off and the appropriate slide valves closed (allow all components to cool down first if necessary and allways reduce the system pressure to ambient pressure level). The system must not be returned to service until the butterfly valve and the rotary actuator have been reassembled correctly in accordance with the instructions and the pipeline has been refilled by professionally trained personnel. To avoid a torque increase during off season shut down, exercise the butterfly valve (full open and close) at least once a month.Flow settingThe Belimo butterfly valves have an approximate equal percentage characteristic curve between 0 and 60 percent opening angle.10% 20% 30% 40% 50% 60% 70% 80% 90% 100%DN 25kv (m3/h)0.12610152436