Cistern Water Suppy Issue

[Last Plumber]

Perhaps there is a foreign body in the supply to the valve?

 

[Plumb37]

Thanks I’ll check that.

It’s strange how the original fill valve and float filled the cistern a couple of times and then stopped to a trickle. Then the brand new fill valve in picture above filled the cistern 5 times and then stopped working.
Two completely different valves doing the same thing so can only be the cold water supply.

What difference would it make if it’s mains fed or tank fed apart from pressure?

Thanks
Gary

 

[Plumb37]

Nice valve, I'm happy to fit them

Really good quality and easy to fit.

 

[Plumb37]

Best thing to do is put a penny valve on cold supply to cistern close penny valve turn back on to see if there is a issue with water supply If cold to cistern and its a standard ball cock it should have a low pressure orfice if its comeing from cold mains should be high pressure orfice use a torbeck valve it comes in a kit with high and low pressure and medium pressure orfice

Thanks for your reply.
The cold feed has a isolating valve already fitted which I turned off to fit the new fill valve and float. When I turned it back on the cistern filled within a minute and worked for 5 fills and flushes. After that its lost pressure and now is not filling. I can’t understand how it can work and then stop with a constant supply.

 

[rpm]

Two completely different valves doing the same thing so can only be the cold water supply.

What difference would it make if it’s mains fed or tank fed apart from pressure?

Thanks
Gary

I can’t understand how it can work and then stop with a constant supply.

Mains fed should give a constant feed however if it is tank fed then perhaps, just perhaps the problem is there.
Try holding the float down and keep it down and flush the cistern when the water is high enough - I expect the water to stop entering the cistern after your 5 flushes and the fault lies within the tank feeding the cistern.

 

[Plumb37]

Mains fed should give a constant feed however if it is tank fed then perhaps, just perhaps the problem is there.
Try holding the float down and keep it down and flush the cistern when the water is high enough - I expect the water to stop entering the cistern after your 5 flushes and the fault lies within the tank feeding the cistern.

Ok many thanks I’ll try that when I get home.

 

[Ric2013]

Another suggestion is that there could be a foreign body in the water and it is obstructing the flow through the isolation valve. When you worked on the system, the FB [edit: foreign body] fell down the pipe and then it came back up with water flow. Mind you, this is a very long shot!

 

[rpm]

Another suggestion is that there could be a foreign body in the water and it is obstructing the flow through the isolation valve. When you worked on the system, the FB fell down the pipe and then it came back up with water flow. Mind you, this is a very long shot!

English please Ric, FB?

 

[Ric2013]

Apologies for confusion. FB was intended to be Foreign Body, as I'd already used the term and thought it was ***bersome enough having to write it once.

 

[rpm]

How about connecting a pipe to the cistern feed and running it to the toilet or basin then open the isolating valve and see what happens over time?