Based on physical experiments , establishing mathematical model , carrying on theoretical calculations , and contrasting experimental results with theoretical ones , it turned out that under the same initiate flow rate , the quicker the closing of the ball valve , the longer the stable time when the liquid gets to vaporizing pressure , and the bigger the water hammer in water interception collision ; under the same closing velocities of the ball valve , the larger the initiate flow rate , the longer the stable time when the liquid gets to vaporizing preesure , and the bigger the water hammer in water interception collision 在试验研究的基础上，建立了含气水锤数学模型，进行数值计算，并与试验结果进行了比较，结果表明，在管道初始流量相同的情况下，球阀关闭速度越快，液体达到汽化压力凡时稳定的时间越长，弥合水锤压力也越大;在球阀关闭速度相同的情况下，管道初始流量越大，液体达到汽化压力凡时稳定的时间越长，弥合水锤压力也越大。
Three mathematical models are presented to express the characteristics based on the systematical analysis of mechanical , hydraulic and fluid dynamic characteristics during three transient process , and numerical calculation methods are carried out to the three mathematical models . with the rigid water hummer theory and hydraulic characteristics , this paper has improved the boundary condition equation at pump during the suspending period , and drew a simplified mathematical model 针对大型低扬程泵站过渡过程的具体特点，利用刚性水锤理论，对事故停泵时泵处的边界条件方程进行改进，并结合泵装置水力特性，得出大型低扬程泵站停泵过渡过程简易计算方法的数学模型；针对具体数学模型编制程序进行计算求解。
The litter - resistance slowly closing butterfly check valve is developed a newest product based on our butterfly check valve , hydra - matic transmission to be add in the valve with unique design , new stuction and optimum performance , can be used pipeline of water supply and dring with such media : fresh water , sea water , sewage , raw water , ect . the valve should be installed at outlet of the water pump , in stapping the pump , the process of slowly closing after valve plate shuts rapidly . can be guard effectively against the destruction water hummer , so to ensure the safe operation of the pipline 微阻缓闭蝶式止回阀是在我厂生产的蝶式双瓣止回阀的基础上利用能量转换原理增设油压缓闭装置的新型模式止回阀，设计独特，结构新颖，性能优宜，适用于净水，源水，污水，海水等介质的供、排水管路中，安装于水泵出口端，停泵时由于油压阻尼作用法盘先速闭后缓闭，以消除破坏性水锤，保证灌路安全运行。
Once the water reaches its maximum speed , the valve slams shut and pressure is built up in the pump . this pressure forces open a second valve linked to the delivery pipe . when nullah water falls past the hydraulic ram , its momentum will lift a tenth of the water to a storage tank located near the esther li building photo 2 泵内有活门，当溪水在流动中受阻，会产生比正常压力高十倍以上的瞬时水锤压力，此时，泵内的另一活门会打开，把十分之一的溪水抽往设于李慧珍附近的储水缸备用（图二） 。
Water wave pump combines the functions of air wave charger and water hammer pump to show fine performance , where the total energy of inflow is redistributed to heighten the presure of a part of the the flow to the desired level whereas for the rest of flow a low level of pressure is maintained , which causes moving water with high energy to reach to a higher place 水波泵是一种巧妙地综合气波增压器和水锤泵功能的全新的水泵，它通过合理利用水波动力的特殊性质，将来流中的总体能量进行重新分配，使一部分来流水提高到所需的高压力，而其馀部分水则降到较低的压力，即完成一个大多数能量向部分来流水转移的过程。
