Toilet flush valve problem

[maurice28]

Hi all,

I'm hoping someone can help with what is probably a really stupid question from a plumbing novice! Recently, my push button flush toilet has occassionally continued to empty water into the bowl after flushing. Then, last night, as I was lifting the lid off the cistern to have a look, the flush valve (I hope this is the right term!) popped up and is now sitting too high to put the cistern lid down properly.

At the moment, it looks like this http://img715.imageshack.us/img715/4528/cistern1.jpg

What I'm referring to as the flush valve is the blue and white bit on the left. I know it's hard to say, but should there be a way to adjust this so it can be lowered again so I can get the cistern lid back on? If so, how is this likely to be achieved, e.g. by turning and pushing down for example?

Apologies again if this is a really basic/stupid/unanswerable question, just thought I'd ask before poking around and potentially breaking something!

 

[Charnwood]

The white bit in the middle id the flush valve. the blue and white bit is the inlet valve (ballcock in old money).
Some are height-adjustable and should be locked in place.
Yours might not have been locked and popped up under the water pressure.

Be aware that it might go ballistic at any time and zoom of into the ceiling if that's the case.

 

[maurice28]

The white bit in the middle id the flush valve. the blue and white bit is the inlet valve (ballcock in old money).
Some are height-adjustable and should be locked in place.
Yours might not have been locked and popped up under the water pressure.

Be aware that it might go ballistic at any time and zoom of into the ceiling if that's the case.

Ah, thanks Charnwood, now I have the right terminology! I'll take a look at adjusting the inlet valve. Do you know if these are normally adjustable in situ or if it is likely the whole thing will need taking out?

 

[Charnwood]

You should be able to adjust in situ.
There will probably be a locking ring on the shaft.