The toilet flush cistern is a fundamental part of domestic plumbing. Inside it is the float valve, an essential component that regulates the filling of the cistern after each flush. Over time, this mechanism can fail, causing annoying problems and wasting water. In this post we will show you step by step how to replace the float in a porcelain toilet flush cistern.
Index:
- What is a float valve and what is it used for?
- When should you replace the float valve?
- What do you need for replacement?
- Step-by-step guide: replacing toilet float valve
- How to install the new float valve
- Video guide: how to replace toilet float valve
- Why should you replace toilet float valve
What is a float valve and what is it used for?
The float valve is a mechanical device located inside the cistern that regulates the water level. It works thanks to a lever system which, when a certain water level is reached, automatically stops the flow, thus preventing the cistern from filling up more than necessary.
If the float fails or loses efficiency (often due to limescale or wear and tear on the rubber components), problems such as automatic flushing may occur, because the water level reaches the so-called ‘overflow’ or the cistern fails to refill. For this reason, proper maintenance or replacement of the float valve is essential for the proper functioning of the toilet and to avoid unnecessary water waste.
When should you replace the float?
A malfunctioning float valve gives clear signs. In fact, it is not always a sudden failure: often it is gradual wear caused by limescale residues and deterioration of the rubber parts. Here are the most common signs that indicate the need to replace it:
- Water continues to flow even when the cistern is full
- The cistern does not fill up at all
- Water overflows from the top of the cistern
- The filling noise is continuous and annoying
What do you need for replacement?
Before you begin, it is important to have everything you need at hand. This will allow you to work quickly and avoid interruptions. We recommend that you get:
- A new compatible fill valve
- A pipe wrench
- An absorbent cloth for any water leaks
- Replacement gaskets
Step-by-step guide: replacing toilet float valve
Replacing the float valve is a fairly simple operation that can be performed even without any particular technical skills. Just follow these steps carefully:
1 – Turn off the water
First, locate the shut-off valve (if present) near the cistern and turn it off. If there is no shut-off valve, you will need to turn off the main water supply.
2 – Loosen the connections
Using a wrench, loosen the two nuts connecting the shut-off valve to the float. This will allow you to release the float valve from the hydraulic system.
3 – Unlock the fixing ring nut
Unscrew the ring nut that secures the float valve to the porcelain cistern. Once removed, you will have enough clearance to pull out the component.
4 – Remove the defective float valve
Gently pull the float valve upwards to remove it completely. Be careful not to damage other internal parts of the box.
How to install the new float valve
With the cistern emptied and the old float valve removed, you can move on to installing the new component. This part is similar to the removal process and requires precision in repositioning the connections.
1 – Install the new fill valve
Place the new float valve in the same housing as the previous one, ensuring that the rod passes correctly through the hole in the box. Screw the ring nut to secure it firmly.
2 – Reconnect the fittings
Retighten the nuts on the shut-off valve or water supply pipe. Check that the connections are tight, but do not overtighten to avoid damage.
3 – Turn the water back on and check that everything is working properly
Turn on the tap and observe how the new float valve behaves. If everything has been installed correctly, the cistern will fill up to the expected level and the water will stop automatically, without leaks or overflowing.
Video guide: how to replace toilet float valve
We have created a detailed video tutorial on Elettronew’s YouTube channel, showing you how to replace your toilet float valve step by step.
Why should you replace toilet float valve
Replacing a faulty float valve is a quick, inexpensive and effective solution to minor but annoying toilet problems. All it takes is a few minutes and the right equipment to get everything working perfectly again. On Elettronew.com you will find replacement float valves and a wide range of professional plumbing supplies for every need.
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