It sets up a mathematical models for the calculation of hydraulic transients on the basis of the boundary conditions of air valves,and carry out a numerical simulation for a water supply project,at last,this paper analysis the influences of different air valves flow features on the water hammer characteristics of pump systems.

By comparing the three types of air valves,valve circuit downlink access law,summed up their respective connections,control theory and the advantages and disadvantages.

Study on air admission and exhaust characteristics of air valve in long water supply system;

Research on characteristics of protection against water hammer of air valve in long water supply systems;

Analysis on performance and operation of air valve for large-scale water conveyance system of Mid-route of South-to-North Water Transfer Project

The butterfly valve closing procedure of water transfer work from Fengjiashan Reservoir to Baoji city is optimized for water hammer protection,and the concept of air valve set is proposed.