RAF 40/43 is used to maintain a preset water level of reservoirs or water tanks. The RAF valve is activated by line pressure, and is commanded by an Altitude pilot. The Altitude pilot is mounted on the valve, therefore there is no installation required on top of the reservoir.
The RAF 40 valve controls the maximum water level of the reservoir by controlling the maximum water column pressure generated by the water inside the water storage.
The RAF 40/43 stays open as long as the water level of the reservoir is below a preset level.
The RAF 40 is a modulating service valve, operating as an on/off valve.
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