Is it necessary to install a check valve on the toilet angle valve?

[McLayla]

It is necessary to install a check valve on the toilet angle valve because the flush toilet tank is connected to the main water supply line. Once the water supply is interrupted or the water pressure is low, the water level will drop rapidly, creating negative pressure inside the sealed tank. This can cause the water in the tank to be sucked back into the main supply line, a situation that often occurs in households above the 5th floor. Installing a check valve on the pipeline between the water meter and the toilet valve can prevent the backflow of water from the toilet. The steps to install a check valve on the toilet are as follows: 1. The check valve resembles a large screw and can be unscrewed into two parts. The part with the valve is inserted through the window opening from outside, while the other part is aligned and screwed onto the first part to clamp the window glass. Before tightening completely, rotate the check valve so that the larger end of the valve faces downward, then tighten it firmly. 2. Attach the range hood duct. The indoor part of the check valve is compatible with three different duct sizes. Choose the appropriate duct size and secure it in place using screws or adhesive tape. If the duct size does not match the check valve, consider purchasing a variable-diameter duct for adjustment. The installation position of a vertical lift check valve should be on a vertical pipeline. Since check valves are prone to damage, they should be installed close to the pump outlet. A shut-off valve should be installed above the check valve for easy maintenance. To facilitate pressure release before removing the check valve, a pressure relief drain valve should be installed between the check valve and the shut-off valve if the check valve itself does not come with one.