Changing a Flush Valve
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Toilets in many modern bathrooms incorporate a flush valve instead of a siphon. Flush valves are quiet and effective and are favoured because they can be used with push button pneumatic flush plates that complement contemporary design. Typically toilet cisterns are hidden behind a partition as shown in the photos below. In these photos you will see how a faulty flush valve is removed and replaced.
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The toilet with a faulty flush valve |
Remove the flush plate |
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Remove the pump |
Expose the mounting bracket |
Obtaining the correct replacement flush valve
Obtaining the correct flush valve is half the task as there are many different valves on the market and most are not interchangeable. If you are in the fortunate position of choosing the sanitary ware in the bathroom before it is installed, check that spare parts are easily available through plumbers’ merchants or bathroom specialists.
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Remove the float valve support |
Remove the mounting bracket |
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Loosen the valve |
Remove old valve through the flush plate opening |
Gaining access and removing the faulty valve
The photos on this page show a Valsir flush valve being changed because water was constantly running from the cistern into the pan through the internal overflow, which is a common problem with flush valves. These Valsir valves proved particularly difficult to obtain as they are not an item stocked in the UK. We managed to get the valves imported from Italy
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The faulty flush valve |
The replacement flush valve |
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Insert new valve through opening |
Reverse the removal procedure |
Installing the new flush valve
The process of replacing the valve is reasonably straight forward as shown in the photos. The water should first be isolated; there is normally a shut-off valve inside the cistern and then flush the toilet. Cisterns can be accessed from the side through the flush plate or from the top. Once exposed the flush valve should twist out. Some water will drop through the flush pipe to the pan. Removing the valve should not cause a leak as it is an internal part of the cistern, but a check with the manufacturer is advised. To fit the flush valve and reposition the flush plate, just reverse the removal procedure.
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