If the water flow indicator is divided into÷©✔ two categories, it can be div↔₩←ided into an impeller type;₹≤ a floating ball type, whic§¶≠σh belongs to a through-mirror and is ∏•an essential accessory fo ©®r observing the flow of the medium ≥≥in the pipe. The flow indicator includes a thrΩ✘¶eaded water flow indicator, a welded wat®γ∞'er flow indicator, a flanged wate♥♦↕r flow indicator, a saddle water flow indic♣♣ >ator, and a saddle water flow indicat‍☆×™or. The water flow indicato✘£βr can also be used as a sprinkler system, <₽<which can be installed on the main water supply p≤βφipe or the cross-bar water pipe to giveβ↔× an electric signal of wat$β‍er flow in a small area of a sub-areaσ☆, and the electric signal can be sent to the e  φlectric control box. , but usually not used a↔αs a control switch to start the fire pump.÷♥‍ε