As a complement to its range of butterfly valves the KSB Group launched a special version for fire protection applications. The Boax-B FM valves, painted in red, are fitted with a specially designed manual gearbox. Suitable for an operating pressure of up to 16 bar, the valves are available from DN 40 to DN 300. The abbreviation FM stands for Factory Mutual, an international set of requirements for fire protection applications. Fire-fighting systems pose a challenge for valves as the piping can be subjected to full pressure for a year or two without the valve being actuated. The one-sided load presses the liner of butterfly valves in the downstream direction. This may result in leakage if the elastomer quality is inadequate. KSB’s design and the liner quality used ensure that the liner does not move, also under pressure, thus providing permanent and lasting tightness. The spherically machined valve disc and the liner, which is moulded accordingly, make for a perfectly tight shut-off at the stem passages. The Boax-B FM valves satisfy the safety requirements of Annex 1 of the European Pressure Equipment Directive 97/23/EC. The flange connections comply with the EN, ISO and ASME standards.
Hall 27, Booth D31
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