One. The direction of the corner switch is as follows.
Under normal circumstances, rotating the angle valve clockwise will open it, while rotating it counterclockwise will close it. However, during the opening or closing of the angle valve, it is important to ensure that the rotation occurs within a specific angle to prevent the valve from coming loose and causing leakage.

Two. What to do if the valve cannot be turned?
1、Strike the handle of the hammer
If the corroded valve cannot be unscrewed, you can use a hammer to knock it loose. First, place the wrench on the valve, and then gently tap the handle of the wrench with a hammer to loosen the valve. once loosened, the valve can be easily removed. Be careful not to apply excessive force when unscrewing, as this could damage the valve.
2、 Apply lubricating oil.
If the valve stem is rusted and cannot be removed, apply lubricating oil. First, pour hot water over the valve stem to loosen it. Then, apply lubricating oil or oil to the valve stem, allowing the oil to penetrate. Finally, use a wrench and a wire brush to remove the valve stem.
III. How to clean and maintain corner joints
A valve may become difficult to turn if it hasn't been properly cleaned, leading to debris accumulating in the threads. Therefore, it's important to understand the cleaning methods for valves to prevent this issue.
1. After prolonged use, corner valves may accumulate stains on their surfaces. To remove these stains, simply rinse with water. Even stubborn stains can be easily removed by wiping with a cloth and then rinsing with water.
2. If the stains on the corner groove are difficult to remove, you will need to purchase specialized cleaning agents. Then, use a cloth to apply the cleaning agent to the corner groove, which can effectively dissolve the stains. After wiping, rinse the stains with water.