1.Proper exhaust during empty pipe water filling;
2.Micro exhaust under working pressure during pipeline operation;
3.High speed suction during pipeline emptying or transient negative pressure;
The above three functions are called ventilation function of air valve, or respiratory function; The valve with ventilation function can be called “air valve” or “composite exhaust valve” or “breathing valve”.
4.Short time delay (e.g. ≤ 200ms @-2kpa) during transient negative pressure destroys vacuum and suppresses bridging water hammer;
5.The valve with the above four functions can be called “waterproof hammer air valve” – anti surge air valve;
6.At the same time, it has the function of not only not afraid of blowing and blocking, but also restraining the water hammer of closing the valve at the large orifice during the water filling of the empty pipe;
7.At the same time, it has the function of micro delay of transient negative pressure response (≤ 20ms @-1kpa);
The valve with the above seven functions can be called “perfect airing valve assembly”.