How does the vent valve work?
| Radiator bleed valves have many names, including air bleed valve, bleed valve, and bleed nipple. | |
| The purpose of an exhaust valve is to release air that sometimes gets into radiators, reducing their efficiency. |
 | The valve consists of a plug that screws into the radiator inlet at the top of the radiator and an adjustable 5mm square head bleed screw in its center. The plug, which usually has half-inch British Standard Pipe (BSP) threads, is screwed into one of the top two holes, female threaded holes in each corner of the heatsink. |
 | The drain screws on most modern radiators also have a slot in their head so they can be loosened and tightened with a screwdriver. |
 | Some forks have external hex heads that can be turned with a regular wrench of the right size or an adjustable wrench. |
 | Others have a square notch, also known as a square section, that is installed or removed using the square end of some multi-purpose radiator wrenches. |
 | Turning the air bleed screw counterclockwise with the radiator bleed key lets all the air out of the radiator. Turning clockwise tightens again. |
 | For a step-by-step guide to the bleeding procedure, see: How to bleed a radiator |
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