Why are Air Release valves required in Building Riser systems?

Air Release valves are required in dry riser systems installed in buildings. When water is pumped into the riser through Fire Brigade inlets (using Fire Tender pumps), the air in the pipe should be released from the highest point in the piping to allow water to flow in (and prevent compression of the trapped air). Air release valves (installed at the top of the riser) allow the air to be released, but once water reaches the valve, it closes the valve, allowing build up of water pressure in the riser, and enabling fire fighters to use this water for fire fighting

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