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Water hammer arrestors are designed to absorb water hammer pressure surges caused by sudden changes in water demand generally caused by system pump activation or switch off and excessive water velocity changes due to demand or system valve operations. The AIT and AIF valves are fitted with an internal diaphragm that is pneumatically pressurised via an external valve to 10% to 20% above the maximum water system pressure. In this way the water hammer arrestor acts as a shock absorber.
Pressure gauge shows internal air pressure.
AIF and AIT - Water Hammer Arrestors