Any one have a simple answer to how torbeck compact valve works

[Readingplumber]

Hi Experts i wonder if you can help me again - with a torbeck compact valve - [DLMURL]http://www.toolstation.com/images/library/stock/webbig/11132.jpg[/DLMURL]

Basically the float valves used in virtually all new toilet cisterns -

when you take the valve apart you come across a diaphram -

Me being oldfashioned thought that when the ball rises the lever pushes in the diaphram but in this case it just shuts a air hole blocking the diaphram, - does anyone have a simple way to explain how the air blocking the diaphram causes the diaphram to push in and stop the water.

Thanks again folks in advance

 

[justlead1]

Hi. It works on the same principal at an equilibrium ball valve. The mains pressure is allowed through the small hole to create balanced pressure (pushing against its self) needing only a small amount of force to close the valve. Good Luck