I fitted a Torbeck valve to my cold water storage tank exactly a year
ago. I also fitted one of the flow restrictors provided in the kit.
Everything has been fine until about a month ago. Now I get about one
minutes worth of 'thumping' noise as the valve tries to shut off. It
does eventually stop. This only seems to happen after either of the two
toilet cisterns are flushed. It doesn't happen when a bathful of water
is drawn off.

Could the small amount used by the toilets be setting up a small wave
causing the Torbeck to shut - open - shut - open etc??

Regards Chris.

wrote:
I fitted a Torbeck valve to my cold water storage tank exactly a year
ago. I also fitted one of the flow restrictors provided in the kit.
Everything has been fine until about a month ago. Now I get about one
minutes worth of 'thumping' noise as the valve tries to shut off. It
does eventually stop. This only seems to happen after either of the two
toilet cisterns are flushed. It doesn't happen when a bathful of water
is drawn off.

Could the small amount used by the toilets be setting up a small wave
causing the Torbeck to shut - open - shut - open etc??

Regards Chris.

Yes. I just experienced this with my 4 year old Torbeck valve.
Some months ago whilst in B&Q warehouse I spotted that you could buy a
rubber
diaphragm for this valve quite cheaply so I bought one on speculation.
I replaced said diaphragm last night and no more "hammer" from the
tank.

Mungo