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How to correctly identify your NABIC valve
has an interesting article relating to Backflow Prevention in the Technical section of their website
ideal for inspection and maintenance of backflow preventer type BA
Chrome Vanadium spring
Advice must be obtained from your local water authority to ensure compliance with
NABIC 568 & 568SS Anti-Vacuum Valve Size:NA-568-GM-DN25 How to correctly identify yourDescription NABIC 568 Anti Vacuum Valves are used to protect drying cylinders, calorifiers and tankers from collapse due to internal vacuum. They are also used on steam systems, to assist condensate drainage and to prevent suction of contents from vats. Vacuum valves are normally fitted vertically, at the top of the vessel or pipeline being protected. Horizontal revolving cylinders however should have a 568 fitted at each end, diametrically opposite
