Home decoration generally requires angle valves in 4 positions: 1 single cooling is required for the toilet water inlet. The water on the washbasin needs 1 cold and 1 hot. The top of the kitchen sink needs 1 cold and 1 hot. The upper nozzle of the water heater needs 1 cold and 1 hot.

According to the above calculation, a total of 7 angle valves are required, 4 cold and 3 hot. If you have 2 toilets at home, you need 8 angle valves, 5 cold and 3 hot. If you have two bathrooms, two washbasins, and two toilets, you need a total of 10 angle valves, 6 cold and 4 hot.