How to Adjust the Toilet Fill Valve

How to Adjust the Toilet Fill Valve- Feature Image

There are two valves inside a toilet tank. These are a flush valve and a fill valve respectively. The flush valve is the one that you activate when you flush your toilet. The fill valve as the name suggests refills the toilet tank. This valve is connected to the water supply.  It acts more like a faucet. It comes into action after the flushing of the toilet. Here a mechanism is utilized to turn on and to turn off the fill valve automatically. Otherwise, the user of the toilet will need to do the turning on and turning off the fill valve manually. The toilet fill valve’s mechanism does not follow a unique mechanism. How the toilet fill valve will function varies from the model fill valve to another. Another thing is it is the fill valve’s mechanism that you need to adjust when the water inside of a toilet tank stays either too high or too low that leads to problems in matter the type of flushing toilet you are using.

Different Types of Toilet Fill Valve

Although professional plumbers believe that there are4 different types of flush valve available in the market, only two types are common. These are float valves and float less respectively. The Afloat valve is a cup or ball. It buoys on the tank water. It does not let water enter into the tank when the water reaches the accurate height inside of it. A floatless one is more sophisticated. It can sense the water pressure inside the tank. It shut off when it senses the water inside of a toilet tank has reached the optimum level. Though floatless valves are more advanced compared to float valves, they are not quite reliable. North American toilets use three different styles of float valves. These are

Plunger style

This is the oldest style of the fill valve. It is also known as ballcocks. It features a plastic ball that is attached with a meta arrangement A plunger mechanism is adopted here to control water flow inside the tank. Except for the ball, the rest of the parts of this fill valve is metal which makes it susceptible to corrosion and requires regular lubrication.


In this style, a float ball is attached with a metal or plastic float arm. This valve uses an elastic diaphragm to regulate the water flow inside the tank.


Another name of this style is Fluidmaster. This name originates from the company that first introduced the fill valve into the toilet market. These valves come with a sealed cup that glides up and down in the fill tube. The usefulness of these valves are they occupy less space inside the toilet tank, easy to adjust, and more trustworthy than a ball valve. New toilets feature cup-style valve

Adjusting the Ball Style Fill Valve

There are two reasons that result in a running toilet. One reason is a leaking toilet flapper that facilitates water seeping through the toilet bowl. Another reason is if the fill level of a fill valve is placed too high that allows water to flow through the overflow tube. If the fill valve is adjusted accurately, the water level should stay one to half-inch below the overflow tube when the valve is closed. If the fill valve comes with a float ball, you can fix the overfilling of the tank in two ways.

Increase the length of the float arm by turning the screw counterclockwise a couple of times that is used to attach the ball with the arm. Increasing the length of the float arm will force the fill valve to shut off quickly and thus stopping the water flow into the toilet tank. Another process is to rotate the float arm so that the bend in the middle of the arm is facing upward. The arm will them push the ball to sink deep into the tank which will also switch off the water flow. If the arm is made of metal or straight, detach it from the fill valve arrangement, bend it to some extent and then replace it.

Adjusting the Fluid Master Style Fill Valve

The float cup of a fluidmaster type fill valve is attached to the valve arrangement by a vertical plastic rod and a screw. Turn the screw counterclockwise to elongate the rod and increase the water level.

Adjusting the Pressure-Sensitive Fill Valve

Find the adjustment screw which can be found on top of the valve assembly sinking under the water of the tank. Turn this adjustment screw clockwise with a screwdriver.  The adjustment of the screw will increase the cut off the pressure and will increase the water level inside the tank. If you turn the screw counterclockwise, the process will lower the cut off pressure and so is the water level in the toilet tank.

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