This feature is of particular importance in buildings with seasonal occupancy such as universities and colleges, football stadia etc.
where the building may be unoccupied during the summer months.
In these circumstances, stagnation of the stored water coupled with high ambient temperatures can lead to conditions which allow legionella and other harmful organisms to colonise the tank and multiply.
Other advantages offered by this type of float valve kit are: delayed action for full flow during tank filling, no water hammer, valve bounce or dribble, tank capacity is maximised and the valves are suitable for Types AA, AB, AF and AG air gaps.
The Keraflo KP Type valve kit comprises a Keraflo 'Aylesbury' KB Type float valve which may be located in the tank itself or in a valve chamber, together with a large in-line KP Type control valve mounted in the supply pipework.
The KP Type valve is opened and closed by the KB Type, acting as a pilot valve.
The KB Type float valve is only 20mm (3/4") in diameter which means that any tank chamber can be kept extremely compact.
This valve is operated by transfer of weight in an actuator tube which causes the valve to open or close, rather than giving the gradual opening and closing achieved with a conventional ball valve.
Attached to the actuator is a 2m long chain with a float and buoy assembly which offers a fully variable differential between opening and closing water level settings by simple adjustment of the length of chain between the actuator and the floats.
The valve is maintenance free and changes in water levels and settings can be made quickly by the installer or maintenance engineer without the use of tools.
Water discharge is via an 'up and over' pipe to facilitate air gap compliance and provide back siphonage protection.
The KP Type in-line valve, which is available in 50mm (2"), 80mm (3"), 100mm (4"), 150mm (6") and 200mm (8"), may be floor-mounted or, alternatively, located either outside or inside the tank itself, above the water level.For more information,please visting http://www.bossgoo.com
