Hi,
I just moved into a fairly modern house (three bed semi c. 1991) with a standard open-vented gravity-fed hot/cold water system. The cold water storage cistern is in the loft, and the hot water cylinder is on the first floor (same floor as bathroom).
When I switch on the cold water tap of the bath mixer, there is a repetitive banging noise (about three bangs per second) with a very small amount of water flow. The hot water tap of the same mixer works fine (so I am sure that this tap must be fine for low pressure/head). The hot/cold feeds to this bath mixer are fed via 22mm pipe and a pair of double check valves. I do not know the make or type of this bath mixer, since there are no obvious branding marks. The taps operate over 1/4 of a turn, so I guess they are ceramic disc?
In the same bathroom, both the hot and cold taps of the basin mixer flow OK, as does the cold water feed to the toilet cistern.
Questions:
- Can this banging be caused by faulty ceramic disks or faulty cartridge, or indeed a faulty mixer?
- Can anyone identify this bath mixer?! I would like to try and find a replacement cartridge, before removing the existing one. See image:
[img=http://img144.imageshack.us/img144/8586/img9484smalloa4.th.jpg]
It looks kinda like a Pegler Xia, but it only has three arms on the headgear (rather than the Xia's four).
- Is there anything I can do to further diagnose this problem?
I would be surprised if there was an airlock, as the flow to nearby taps is OK (i.e. the pipe layout looks professional - as it was originally installed). Also, I guess the fact that there are double check valves inline, means that I can't try blowing the airlock back out of the system using the "mains cold water" technique?
Any help or advice gratefully received!
I just moved into a fairly modern house (three bed semi c. 1991) with a standard open-vented gravity-fed hot/cold water system. The cold water storage cistern is in the loft, and the hot water cylinder is on the first floor (same floor as bathroom).
When I switch on the cold water tap of the bath mixer, there is a repetitive banging noise (about three bangs per second) with a very small amount of water flow. The hot water tap of the same mixer works fine (so I am sure that this tap must be fine for low pressure/head). The hot/cold feeds to this bath mixer are fed via 22mm pipe and a pair of double check valves. I do not know the make or type of this bath mixer, since there are no obvious branding marks. The taps operate over 1/4 of a turn, so I guess they are ceramic disc?
In the same bathroom, both the hot and cold taps of the basin mixer flow OK, as does the cold water feed to the toilet cistern.
Questions:
- Can this banging be caused by faulty ceramic disks or faulty cartridge, or indeed a faulty mixer?
- Can anyone identify this bath mixer?! I would like to try and find a replacement cartridge, before removing the existing one. See image:
[img=http://img144.imageshack.us/img144/8586/img9484smalloa4.th.jpg]
It looks kinda like a Pegler Xia, but it only has three arms on the headgear (rather than the Xia's four).
- Is there anything I can do to further diagnose this problem?
I would be surprised if there was an airlock, as the flow to nearby taps is OK (i.e. the pipe layout looks professional - as it was originally installed). Also, I guess the fact that there are double check valves inline, means that I can't try blowing the airlock back out of the system using the "mains cold water" technique?
Any help or advice gratefully received!
