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Temperature Control Valve
This may be manually or automatically controlled to provide the desired temperature in the cabin. It is set so that a certain quantity of hot air (say at 200°C) goes direct to the mixing chamber while the rest of the air goes via the cooling system which may cool it to as low as -20°C (Concorde).
When set to 'automatic' the valve is controlled either by a >bridge system< or by a computer. Sensors are placed in the system and in the cabin to send signals to the bridge system or the computer. The output of the temperature control system will control the valve so that a certain amount of hot air is sent to the mixing unit to be mixed with a certain amount of cold air ensuring the temperature of the air to the cabin is 'just right'.