译文：
　 　当市政供水压力不足，需要建筑给水加压，提升供水压力才能满足使用要求。现代建筑几乎无例外地采用离心泵加压。众所周知，当水泵的额定转速一定，水泵加压所能达到的压力由水泵的外特性曲线(当n一定时的H：fcQ特性曲线)所制约。也就是说，给水加压系统的{zg}压力受离心泵的外特性曲线限制，加压系统不会超过水泵所能达到的{zg}压力。　　在使用过程当中，当水泵突然开、停、止回阀突然开、闭，电磁阀快速开、关等等，在管网系统中可能出现水锤冲而。在发生水锤时，在管网系统中可能形成很高的压力，引起管网爆裂。应当指出，发生水锤与多种因素有关，很难在设计阶段确定。在系统调试时如果发生水锤，则应采取针对性的措施进行解决。　　由此可见，对于给水加压系统而言，在通常情况下，系统不会出现超压，在不发生水锺的情况下，其{zg}压力不会超过水泵的{zg}压压力。设离心泵的额定压力为P2；按水泵样本，在零流量下的{zg}压力通常为Pmax≤1.3P2。为确保安全给水管网和设备必须能承受Pmax而不致于损坏；在设计上无必要设置安全阀等防超压措施。　　应当指出，用设置安全阀来防水锤超压是不可靠的。水锤通常是通过调试来发现并合理解决；在设计阶段通常不予考虑。我们认为，管网系统为不能承受离心泵在零流量下的{zg}压力Pmax是不安全的。　　综上所述，我们认为对于给水系统无必要设置安全阀，管网和设备应能承受离心泵在零流量出现的{zg}压力(对于有驼蜂H=f(Q)外特性的离心泵，其{zg}压力可能在某一小流量下出现)。

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原文：
When the municipal water supply pressure of inadequate water pressure necessary to build and upgrade the water supply pressure to meet the use requirements. Almost without exception, modern buildings with centrifugal pressure. As we all know, when the pump's rated rotational speed, pump pressure can reach the outer pressures from the pump characteristic curves (when n certain time H: fcQ characteristic curve) and control. In other words, water pressure system, the maximum pressure by the centrifugal pump characteristic curve of the outer limits, pressurized pump system does not exceed the maximum pressure attainable. The use of the process, when the pump suddenly open, stop, check valve suddenly opened, closed, solenoid valve fast opening and closing, etc., in the pipe network system, water hammer may occur in the red. In the event when the water hammer in the pipe network system may form a high pressure, causing burst pipe network. It should be noted that the occurrence of water hammer with a variety of factors, it is difficult to determine at the design stage. Debugging in the system, if water hammer occurs, it should take appropriate measures to resolve. Thus, for the pressurized water supply systems, under normal circumstances, the system does not appear over-pressure, water does not occur in the case of Chung, the maximum pressure does not exceed the most high pressure water pump. Rated pressure centrifugal pump-based P2; according to pump samples, at zero flow rate is usually under the maximum pressure Pmax ≤ 1.3P2. To ensure safety to the water supply network and equipment must be able to withstand Pmax, they would not damage; in the design is not necessary to set safety valve and other measures to prevent overpressure. It should be noted that setting up to water hammer overpressure valve is not reliable. Water hammer is usually through the debugger to find and reasonable solution; normally not be considered in the design stage. We believe that the pipe network system can not withstand centrifugal pump at zero flow rate under the maximum pressure Pmax is unsafe. In summary, we believe that for the water supply system is not necessary to set safety valve, pipe network and equipment, centrifugal pumps should be able to withstand the maximum occurs at zero flow pressure (for a camel Bee H = f (Q) outside the characteristics of centrifugal pumps, their The maximum pressure may occur in a small flow rate).

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