Float chamber

A float chamber is a device for automatically regulating the supply of a liquid to a system.

However, this arrangement is found in many automatic liquid systems, for example the cistern of most toilets could be said to be a type of float chamber.

The float valve uses a pointed needle against a square-edged seat, to give a positive shut-off.

Some designs, such as the SU, may allow a separate float chamber body to be adjusted relative to the carburettor to compensate for this.

One drawback of the basic type of float chamber described is that it only operates correctly when it is the right way up, so more sophisticated solutions are needed in aircraft.