重力流输水压力调节和水锤控制探讨

近年来,我国的长距离、大口径管道输水工程发展迅速,建设规模愈来愈大。管道系统的压力调节和水锤控制是关系到工程建设成本和运行安全的大问题,值得认真对待。本文列举了重力流管道输水系统竖向设计的几种纵剖面形式,论述了压力调节和水锤控制的特点和技术措施,并介绍了关键设备—在线式减压阀的应用。

管力阀结构特性与泵站输水管道水锤控制

介绍了管力阀的结构特点和工作原理,分析了管力阀的结构特性。根据结构特性对管力阀水锤控制进行了分析。并论述了管力阀工程应用情况,启泵、关阀过程平稳,水锤控制效果明显。

电磁阀设计理论与控制方法研究动态

电磁阀是管道流体输送系统中广泛使用的控制元件.阀门的发展方向主要是扩大产品参数,发展节能、省力以及自动控制阀门,并通过改进结构、采用新材料和新工艺提高阀门的使用寿命;同时要扩展专用阀门系列的应用.

电磁阀原理和设计选型原则及依据

电磁阀门是管道流体输送系统中应用最广泛最重要的执行机构和控制元件，控制系统中不可缺少的设备。本文介绍了电磁阀的工作原理，以及电磁阀的设计选型依据和选型原则。

Analytic study on the optimal control of water hammer waves in pipes

To realize the accurate control of water hammer in pipes by valve stroking, based on basic differential equations of water hammer subjected to initial and boundary conditions, the traveling solution of wave equations in finite region was applied to the linear water hammer problem. With the given velocity function at the valve and the introduction of curve integration independent of integral path, the exact analytic solution of dimensionless water hammer pressure was obtained in the course of valve closing. Based on the definition of eigen wave height, optimal eigen wave height and observation time, the control goal of water hammer pressure and the judgment rule of the optimal eigen wave height were determined, then the optimal velocity function in the calculated example was derived, which can reduce the water hammer pressure maximally. According to this function, a valve closing program was set, and the optimal control of water hammer could be realized.