Noisy cistern.

The Novice said:

No, that’s a Siamp along with a Siamp flush valve. If you can’t get to the inlet valve, then you may be able to unscrew the existing top half out and replace the top half, or undo a locking nut (grey in colour) and pull up to separate and insert new one and secure with locking nut.

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Thank you for that. That sounds very helpful. In fact I Googled Siamp and found lots of stuff about them, including their own web site. I will be taking the top off the cistern again and investigating. And thank you for your signature which mentions the Thanks button. I hadn't seen that. All done now.

just pumps said:

Siamp are decent valves.

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Thank you for that. Is it possible to get spares for various parts of the valve or is it a complete unit if I need to replace something ?

could be the shock arrestor needs servicing, depending on the type if it's like ours you have to pump the dry side up occasionally, make sure the right amount of air is left.

John D v2.0 said:

could be the shock arrestor needs servicing, depending on the type if it's like ours you have to pump the dry side up occasionally, make sure the right amount of air is left.

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Thank you for that. Our shock arrestor was placed under the sink in the kitchen because the if the combination tap was turned off abruptly it would make a clunking noise in the tank room upstairs. I am assuming that this arrestor won't have any effect on the downstairs loo Y/N ?

The arrestor would help them all, it would have best effect directly adjacent to the affected appliance though.

John D v2.0 said:

The arrestor would help them all, it would have best effect directly adjacent to the affected appliance though.

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Thank you for that. I've never been that impressed by the arrestor under the sink. We have combination taps everywhere (I think that's what you call them - one handle and side to side for hot/cold and up and down for on and off) and it is possible to shut the water off in a nano second as opposed to turning a tap to stop the flow. If we push the handle down really very quickly on the kitchen tap we can still make the system "clunk"

Servicing the existing Siamp fill valve might fix the problem. Replacement diaphragm seals are available if needed. The big knurled plastic part visible in your pic should unscrew to give access without having to remove the whole valve from the cistern (but make sure the mains water supply to the cistern is turned off first!).
I'm not familiar with that Siamp valve, but if it's operation is similar to the Torbeck one then movement of the diaphragm is controlled by a pilot valve which is operated by the plastic lever. The pilot valve has a tiny (3mm? diameter) rubber seal which is subject to wear. Prising that out carefully and reversing it (or replacing it) can often cure a valve-doesn't-shut-off-properly problem.
If you do end up having to replace the whole fill valve, make sure the flow restrictor included with the new valve is fitted before installing the valve in the cistern.

Alec_t said:

Servicing the existing Siamp fill valve might fix the problem. Replacement diaphragm seals are available if needed. The big knurled plastic part visible in your pic should unscrew to give access without having to remove the whole valve from the cistern (but make sure the mains water supply to the cistern is turned off first!).
I'm not familiar with that Siamp valve, but if it's operation is similar to the Torbeck one then movement of the diaphragm is controlled by a pilot valve which is operated by the plastic lever. The pilot valve has a tiny (3mm? diameter) rubber seal which is subject to wear. Prising that out carefully and reversing it (or replacing it) can often cure a valve-doesn't-shut-off-properly problem.
If you do end up having to replace the whole fill valve, make sure the flow restrictor included with the new valve is fitted before installing the valve in the cistern.

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Thank you for that. I had actually just been looking at some YouTube videos explaining how to dismantle that valve. Having said that the cistern is shutting off as it should. The problem was that just when the filling cycle was complete we were getting a "clunking" noise. I say "were" because today I got ridiculously lucky ! I took the top off the cistern again to try and take some better photos. so that if I had to order a new filling valve then I would know which one to order. I had a bit of a play while I was in there ( I have a bad habbit of fiddling with things even when I don't know what I'm doing !!). Put it all back together again and the clunking has now stopped, or so I am told by She Who Must Be Obeyed. Knowing my luck it will start "clunking" again soon worse than ever but I'm going to enjoy my popularity while it's still available.

I wouldn't have known where to start if it wasn't for all the help that I've been given on this Forum and so thank you all very much.