toilet slow to fill

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I opened the back of this toilet I cannot see any brandname on the float. It is a push button on the top centre inside I saw a white cuboid float about 2" x 3" x 2"  slides up/down on a white pole with a grey screw thread, height adjustment for the fill level.  

When the float is down the water is coming in a very small hole making a fine jet of water instead of a good flow of water. so it takes ages to fill.  

A plastic lever is fixed to the grey screw thread, when float goes down the lever goes up which opens the valve.  I removed the lever from the grey screw thread to see if I was able to push it up more so that it would open the valve more but it does not.  

I'm guessing this is a quiet fill valve? 

How do I fix it to increase the water flow?

Bendy_House

We need to know the make of the inlet valve so we can hopefully advise on how to dismantle it. Some are very easy, others not quite so.

Photo please?

Most likely causes would be a partially blocked orifice, or a restrictor has been added to suit mains-pressure water, when it's supplied by a tank in t'loft.

Has it ALWAYS been like this, or is it a recent development?

GDB2222

Is this a hard water area?

The only time I took one of the fiddly plastic valves to pieces I ended up buying a replacement. The old brass ones were easier to service. 

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It has been like this since we bought the house, the house was never really occupied by previous owner who just renovated it and then sold it.  

We don't have a tank in loft -combi boiler- and other 2 toilets fill normally.  

Don't have ability to upload photos. 

Don't know about water hardness.  kettle stays clean if that means anything. 

I'll have another look for a brand name with a torch. 

Bendy_House

xxxxxxxx said:

It has been like this since we bought the house, the house was never really occupied by previous owner who just renovated it and then sold it.  

We don't have a tank in loft -combi boiler- and other 2 toilets fill normally.  

Don't have ability to upload photos. 

Don't know about water hardness.  kettle stays clean if that means anything. 

I'll have another look for a brand name with a torch. 

Useful info.

Likely to be pretty much brand new item, then? And unlikely to be scale build-up. And combi boiler implies mains pressure, so the wrong - smaller - inlet restrictor being fitted inappropriately would not be the case either.

That leaves: cistern isolating valve is partially closed - can you check it? (Should be on the pipe supplying the toilet). Or, pipe debris from the installation is causing a partial blockage - this is very common on new fitments, especially if the installer didn't carry out a pipe-flush before fitting the valve. Or, something else... Could just be a faulty valve, I guess!

Do you have a camera on your phone? Or, could you bring up  page of Google images for "toilet inlet valve' or similar, and compare them - "That's the one!"

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It is a SIAMP inlet valve and float 

probably the 

https://www.siamp.co.uk/compact-99b/

The high force of this jet of water leads me to believe the mains tap is fully open to the valve,  it is a slotted screw type isolating valve and the slot is inline with the pipe, leads me to think fully open.  it is also not accessible to try (which is slightly worrying.). 

Bendy_House

xxxxxxxx said:

It is a SIAMP inlet valve and float 

probably the 

https://www.siamp.co.uk/compact-99b/

The high force of this jet of water leads me to believe the mains tap is fully open to the valve,  it is a slotted screw type isolating valve and the slot is inline with the pipe, leads me to think fully open.  it is also not accessible to try (which is slightly worrying.). 

Thanks - I'll look it up.

Yes, screwdriver slot in-line with the pipe is 'on'. It's a bit worrying that you cannot get easy access to it - would a longer SD blade help? If not, then obviously the whole house water will need shutting off - and it won't go back on until you refit the valve, fixed or no!

(The high force of the small jet of water would exist even if the isolating valve were partially closed, as enough flow and pressure would be getting past the semi-closed isol valve to match that small jet. But if the inlet valve opened fully so you had a big jet, then the reduced flow through the isolating vale would have an effect.)

Bendy_House

https://siamp.co.uk/wp-content/downloads/manuals/50_5455_00_LD.pdf

There might be YouTube videos to help  

Once you remove the 'valve' part, get someone to slowly open the mains stopcock to flush the pipes, and also check there's a good flow into the cistern. Be ready with a cup or similar to catch and deflect the resulting jet into the cistern, and if for any reason this fills too much, just flush the toilet. Ie - DO NOT PANIC!

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This 
https://www.diynot.com/diy/threads/siamp-cistern-not-stopping-filling.361188/  

suggests the fine jet of water is normal.  crazy but normal?  

quiet fill  i.e. (a fine jet of water that takes ages to fill.)
https://www.tradewashrooms.co.uk/toilets/toilet-cisterns/inlet-valves/compact-99b-inlet-valve/

Bendy_House

Just how long does it take to refill?

Bendy_House

Yes, that IS thin!

I suspect that the thin jet is actually just a valve-control jet - ie is a diverted stream only used to operate the valve, and shut it off when the correct level is reached. The actual FILLING flow will be elsewhere, perhaps fed by a floppy plastic tube? Or, it'll head down the vertical pipe, inside that outer skin, to flow in to the cistern below water level. Any sign of that?

If the other flow isn't obvious, then the valve will be faulty. That's IF there should be another flow... Can't possibly be that thinny!