Bleed Screws – Central Heating

Bleed Screw

This webpage is about central heating bleed screws. This web page explains:

· What a bleed screw is.

· What a bleed screw does.

· How to use a bleed screw.

What Is A Bleed Screw?

A bleed screw allows the temporary opening of a system to allow a liquid or gas to escape.

The liquid or gas comes out due to the pressure inside a system being greater that the pressure outside a system.

What A Bleed Screw Does

In central heating a bleed screw allows air to escape from, for instance, a central heating pump or a radiator.

Air in central heating is not good, it prevents water flow; bleed a radiator or pump to increase efficiency.

The image below shows a radiator bleed screw.

How To Use A Bleed Screw

Turn a bleed screw half a turn at a time, listen for escaping air, as soon as you hear escaping air stop turning.

Prepare for a small water leakage.

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