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By allowing air to enter the soil system, it protects water seals and minimises the amount of vent pipes in a building, which would normally be vented through the roof to atmosphere.
The valve will be in a closed position, preventing foul air from escaping from the pipework or when positive pressure is created in the soil stack by the discharge from pressured appliances within the system. When it comes across negative pressure, the valve will open automatically and allow for air to enter, preventing loss of water seals in the appliance traps by balancing pressures.