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ldart66

07:10AM | 06/24/06
Member Since: 06/23/06
3 lifetime posts
Bvplumbing
A few months ago we replaced our upstairs hot water heater. At the same time, the service we used "Superior Plumbing" suggested we upgrade the valves on our water pipes. Which we did, replacing the main valve in the house as well.

a few weeks later both toilets in the house would run periodically, which we corrected by replacing the rubber seal inside the float in the back of the tank.

Now,when flushing the upstairs toilet we get horrible water hammer. It makes no difference how much or little flow is turned on to the toilet, and it only happens with the upstairs.

What would be the cause, and what would you recommend to fix it?

Billhart

07:29AM | 06/24/06
Member Since: 04/25/05
1915 lifetime posts
Two completely different things are oftened called water hammer.

The true water hammer is caused when fast moving water is sudden turned off (by an "automatic valve such as a toilet or washing machine). With it you will hear a single BANG and possibly followed by a rattle, rattle from loose pipes.

The other problem, which I suspect that you are talking about, is caused by "something" in the water flow that is free to move around. Depending on what is is the sound can be a rat-tate, a fast machine gun fire sound, or a whistling.

From the work something could have been dislodged and stuck in the pipe. But most commonly the problem is a loose washer/seal in a valve or the stem is loose.

I would start with checking the stop valve washer. If that is not the problem then I would replace the whole fill vavle.

If that is not the problem then remove the stop vavle (it if is threaded, if not do this on the toilet supply line side, but the problem could be trapped by the stop valve). And rig a hose to it. Then turn on the house water and flush the line.


ldart66

05:13PM | 06/24/06
Member Since: 06/23/06
3 lifetime posts
Thank you, will try that.
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