Effects of surge anticipation valve on water hammer process in a pumping station with high head were analyzed by means of the water hammer theory and method of characteristics, the optimized combinations of the related parameters of the valve were explored as well. The transient processes were analyzed under 13 opening and 10 closing modes for the surge anticipation valve. It was found that the surge anticipation valve can effectively suppress the highest pressure in the pumping station system; unfortunately it also can reduce the lowest pressure in the system in some circumstances. The opening time period, fully opening time period and closing time period are the three key parameters that affect the protective effect on water hammer pressure for a surge anticipation valve. There is an optimal combination among them to keep the highest pressure being at the lowest level and with a minimum drop in the lowest pressure. Also, it was found that the valve must be fully opened before the first pressure wave arrives under the accidental pumpstop condition. To avoid further declination in the lowest pressure caused by too much water leakage, it is suggested that the fully opening time period should maintain short. The highest pressure in the system declines with increasing closing time period; so a longer closing time period is more in favor of protective effect on water hammer pressure for an anticipation valve. The results may be useful to water hammer protection with surge anticipation valves in a newly built or existing pumping station with high head.
Liu Zhiyong, Liu Meiqing. Analysis and optimization of main influencing parameters for waterhammer prevention characteristic of air valves[J]. Transactions of the Chinese Society for Agricultural Machinery, 2009, 40(6):85-89.(in Chinese)
Wang Wenquan, Zhang Lixiang, Yan Yan, et al. Numerical simulation of the water hammer caused by accidental pumpstop in long water supply systems[J]. Transactions of the Chinese Society for Agricultural Machinery, 2010,41(11):63-66.(in Chinese)