Cant see the wood for the trees

[townfanjon]

This is one of them, am i missing something ?

Customers ensuite cistern ball valve keeps letting by during the night (or thats when see hears it most just a small dribble lol.
so i put a new fluid master side entry yesterday, same thing happens last night
so i put another one in today, hoping its a faulty new valve, oh no , shes just rung and this ones letting by.

pressure spikes , maybe , never had anything like this before, any ideas boys.

thank you

 

[drip-dry]

Well probably not faulty valve,,maybe syphon with split in it letting water level drop over period of time when not in use or if seating syphon ,maybe letting by into pan

 

[townfanjon]

That did cross my mind ,the water level definatly rises, but not enough to come back into the pan. Its baffled me lol

 

[zzzjim]

Small uncomplicated setup ,or lots of long pipe runs involved ?
Does she only heat at night ?
Water meter ?

 

[buckley plumb]

had one doing this replaced syphon and valve with fluid master kit and it stopped

 

[townfanjon]

Lol, pipes everywhere, not sure about meter, its local ish to me so i know mains pressure is around 6 bar or more, started off a problem at night but it does happen through the day, like i say this a pressure prob i am sure .

 

[JCplumb]

Pressure reducing valve on the feed? About £20, if you're sure it's a pressure problem - job sorted.

 

[zzzjim]

Like you say pressure , any crud at bottom of cistern ?
( may only move thru system when pressure high / flow rate good )

Thinking crud ,getting stuck in seal surface
(If they can be dismantled these days )

 

[Phil]

Water trickles into pan and triggers ballvalve?

 

[townfanjon]

No nothing comes into pan.. Level is well high so valve should have knocked off, like i say it happened on the first valve ,admittantly an old one but now on two brand new fluid masters

 

[zzzjim]

Living in a high pressure HA house a replacement Valve lasted a 1 day after tennants wound their stop tap fully open . Sudden shut off slam was killing valve !
-- More isn't always best --

 

[Best]

Just fill the cistern up and then dry the water around the top part of inside of bowl. Then use a torch to shine on back of bowl to see if there is a trickle of water. Seen the odd syphon with a crack in it & obviously loads of these modern flush valves letting water pass

 

[plumben]

I'd swap the siphon for a new one just in case its letting a very small amount pass by which over time is letting the water level drop, and maybe fit a prv and inline strainer on the feed

 

[townfanjon]

Thanks for all advice chaps, i am back on monday, but customer says defo no water coming back into pan .

 

[townfanjon]

Update for anybody interested.... Went back yesterday and just put a torbeck on , with this jobs history i never in a million years thought it would work. Just rung customer everything's ok.(fingers crossed)