The isolation valves are crucial components of water distribution systems (WDS) that are used to shut down a segment of the network to repair or replace failed pipes. In this paper, an algorithm to find adjacent valves to isolate a failed pipe was proposed and the global resilience analysis method was implemented to find out the critical segments based on the isolation valves. The method was applied to Net3 network with three different isolation valve configurations.

The location of isolation valves changed the resilience of the WDS considerably. The critical pipes and segments were also varied with different valve configurations. More than 60% of the most critical pipes are different between N valves and N-1 valves configurations. The resilience of limited valves configuration (with 52 valves) was 22% and 15% less than the resilience of N valves and N-1 valves configurations with 228 and 105 valves, respectively. Furthermore, with adding valves to the critical segments, the resilience can be enhanced noticeably.

隔离阀是水分配系统（WDS）的关键组件，用于关闭一部分网络以修理或更换出现故障的管道。本文提出了一种寻找相邻阀门来隔离故障管道的算法，并采用全局弹性分析方法来基于隔离阀门找出关键段。该方法已应用于具有三种不同隔离阀配置的Net3网络。

隔离阀的位置大大改变了WDS的弹性。关键管道和管段也随阀门配置的不同而变化。N阀和N-1阀配置之间超过60％的最关键管道不同。受限阀配置（具有52个阀）的弹性分别比N阀和具有228和105个阀的N-1阀配置的弹性低22％和15％。此外，通过将阀添加到关键段，可以显着提高弹性。