Baffled by Ballvalve

[Mark Carver]

I have a leaky ballvalve, in an Ideal Standard/Armitage Shanks cistern.

I phoned Ideal Standard's help line and they very kindly send me a kit of replacement washers and a new diaphragm.

struggled to take the thing apart, I'm totally baffled how it should work. The Ballvalve cap in the centre of the picture fits over the top of the diaphragm, but I fail to understand how the float arm, that fits on hinges on the top of the cap, can possibly do anything ? There's a tiny hole that a rubber bung in the float arm sits over when the cistern is full.

And where does that red plastic valve come into play ? Needless to say I've reassembled, and it doesn't work, though it did before dissembly !

Can anyone help please ?

-- Mark Please replace invalid and invalid with gmx and net to reply.

[Mark Carver]

Don't worry, I've finally realised:-

a: You need to apply enough water pressure for the thing to shut off

b: You need to wait a few seconds for it to work.