Lever vs Button Toilet?

roddydogs

Can a lever be a syphon and dual flush? I suppose they must be as its an eu directive. Agree button flushes often leak, mine does but its so small not worth the bother of paying to get fixed.

bob_a_builder

Yes - they do exist , but they are logically the wrong way round to my mind
The "Depress and Let go" should give you the water saving flush - rather than the full flush

Labels just about readable
https://ibb.co/t2fDFNC

getmore4less

Just googles dual flush they are dirt cheap <£5
press and hold explained here
https://www.vivasanitary.co.uk/news/how-a-dual-flush-syphon-works.aspx

Jeepers_Creepers

One of the lever type I looked at for this thread was pull up lever for short, down for full flush - or vice versa. No idea what sort of mech was inside - I suspect not syphon.

southcoastrgi

Jeepers_Creepers said:

One of the lever type I looked at for this thread was pull up lever for short, down for full flush - or vice versa. No idea what sort of mech was inside - I suspect not syphon.

..........

roddydogs

Do you need to go back to the outside overflow for a dual flush syphon?

getmore4less

roddydogs said:

Do you need to go back to the outside overflow for a dual flush syphon?

No 

The flush volumes are done by holes to let the air into the stem of the plunger which is why you need to hold the handle down the higher the plunger the sooner the air gets in as  the level drops they could do a design with the short flush on release the handle but that could be more prone to failure as you need to seal the hole when holding the handle down   

getmore4less

Mickey666 said:

roddydogs said:

Can a lever be a syphon and dual flush? I suppose they must be as its an eu directive. Agree button flushes often leak, mine does but its so small not worth the bother of paying to get fixed.

So do mine, but it's trivially easy to replace the silicone seal for a couple of quid and there are loads of online videos showing how.   The problem is that they are so unreliable that they fail after a few years and because they leak into the pan most people don't even notice.  Goodness knows how many millions of litres of pure, clean, potable water are lost in this way each year.  They are a classic example of a cure (dual-flushing volumes to save water) being worse than the disease (water waste).

As has been shown they are not the only option for dual flush and it is not always the dual flush that is the design issue of leak failures.

One of ours goes wrong with a small build up of scale that neds a dismantle and descale.

A siphon can't leak without an inlet failure, or the seal fails where it goes through the cistern base.