The High-Temperature test of the butterfly valve was done in two days. The valve is placed inside a metal vessel, with an inlet connect to heat-up blower. The interior part of the vessel has a 10cm layer of thermal isolation materials. Only the butterfly valve sits in the vessel and the actuator stays out. The roof of the vessel is covered with 6cm thick thermal isolation wools. One floating thermocouple will measure the temperature of the ambient inside the vessel. One thermocouple is connected to the bonnet, one to the outer body of the valve and one is connected to the inside body of the valve. No floating thermocouple is placed in the flow bore of the valve. Determination of actuator torque will be done by measuring the lowest air pressure, at which the butterfly element of the valve starts to move. This pressure can be transferred to the torques according to the provided table. The perfromance test was done in three phases:
1. Before Heat Up phase
2. At 355 Degree Celsius phase
3. After cool down to ambient temperature phase