Reasons Why Your Toilet Tank's Fill Valve Is Constantly Running

The toilet is one of the indispensable devices in our daily lives. However, sometimes we encounter problems, such as the water supply valve of the toilet tank continuously filling water. Here are the reasons why the toilet tank's water supply valve keeps filling water nonstop.

1、Water Supply Valve Leak

The water supply valve is one of the key components controlling the water entry into the tank. If the water supply valve has poor sealing or is damaged, it will result in continuous water filling. This could be due to long-term use or improper use. The solution is to replace the water supply valve. You can purchase a new one from a nearby bathroom supply store and follow the manual for replacement. When maintaining the water supply valve, make sure to turn off the water source to prevent repeated water filling, which can cause waste and excessive water pressure.

2、Tank Leak

Another possible reason is that there might be a leak in the tank itself. Check if the tank has any damage or cracks; sometimes small cracks can be difficult to detect. If you find a leak in the tank, it's advisable to replace the tank directly. Purchase an appropriate tank and ensure it is installed correctly. Additionally, always keep the area clean; when cleaning, use soft-bristle brushes or similar gentle tools to avoid damaging the water supply valve.

3、Improper Adjustment of the Rod

Inside the toilet tank, there is a rod that connects to the water supply valve and controls its opening and closing. If the rod is improperly adjusted, it can prevent the water supply valve from closing correctly, causing the continuous water filling issue. To resolve this, simply adjust the rod's position so that it correctly connects to the water supply valve.

4、Abnormal Float Ball

The float ball in the toilet tank is another crucial part that controls the water supply valve. When the water level in the tank decreases, the float ball descends and opens the water supply valve, allowing water to fill the tank. If the float ball is abnormal, such as being stuck or damaged, it will keep the water supply valve open continuously, leading to nonstop filling. In this case, you will need to replace or repair the float ball. Additionally, regularly checking and maintaining the water supply valve can extend its lifespan and ensure the toilet operates normally.

summary：

we have discussed the reasons why the toilet tank's water supply valve keeps filling water nonstop. This could be due to issues such as a leaking water supply valve, a leaking tank, improper adjustment of the rod, or an abnormal float ball. It's important to carefully examine these components and take appropriate measures to resolve the issue. If you are unsure how to handle it, it is recommended to consult a professional plumber to ensure the problem is thoroughly resolved.