Water - Control Valves

Point features representing water valves along the City's water network, includes such types as air release valve, blow off, check valve, and system control valve. Valves are used to regulate the flow of water or to release air from pipes in the water network. Updated as an on going process.本数据集的点要素（Point features）用于表征城市供水管网沿线的各类供水阀门，涵盖排气阀（air release valve）、放空阀（blow off）、止回阀（check valve）以及系统控制阀（system control valve）等类型。此类阀门可调节供水管网内的水流，或实现管道排气功能。本数据集处于持续更新状态。