This document specifies:a)field of application;b)requirements for pressurised air inlet valves;c)dimensional and the physico-chemical properties and the properties of general hydraulic, mechanical and acoustic design of pressurised air inlet valves DN 15 to DN 50;d)test procedure and requirements for verifying these properties;e)marking and presentation;f)acoustics.This document specifies the characteristics of pressurised air inlet valves DN 15 to DN 50 that are suitable for use in drinking water systems at pressures up to 1 MPa (10 bar) and temperatures up to 65 °C and for 1 h at 90 °C.