浮子在城市给排水工程中应用较多，尤其在浮球阀。水位标示和排水自动控制方面，更离不开浮于。主要有塑料空心浮球、铜皮空心浮球、聚苯乙烯泡沫浮球等，浮球原本都是为浮球阀设计。因为其特点主要是浮力大、自重轻、均为球体，所以，浮球并不适合在城市排水中应用，只是代用 Floats are used in urban water supply and drainage projects, especially in floating ball valves. Water level indication and automatic drainage control are more inseparable. There are mainly plastic hollow floats, hollow copper floats, and polystyrene foam floats. The floats were originally designed for float valves. Because its characteristics are mainly buoyancy, light weight, and all spheres, the floats are not suitable for use in urban drainage, but only substitutes.