When the plug is closed, the sealing surface is firmly attached to the edges of the expansion tank opening. The air cannot escape, the pressure is maintained.
When heated, the pressure in the cooling system increases and at values of 0.9-1.15 bar (for models up to August 1978) or 1.2-1.35 bar (for models manufactured after August 1978) the safety valve opens. Now, to reduce the pressure, a small amount of air and steam can escape.
When the temperature drops, the coolant decreases in volume in the cooling system, a vacuum is observed. To compensate for the vacuum in the plug, a second valve is installed. It opens at a reduced pressure of 0.06-0.1 bar, so that outside air can enter the cooling system.
Instruction. In models produced before July 1978, a plug was used, a safety valve that opened at a pressure of 0.9-1.15 bar. Now such plugs are not produced. Currently, corks are produced that open at a pressure of 1.2-1.35 bar.
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