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Old 06-18-2015, 09:12 PM   #16
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Imo, it's a good idea to open the valve all the way then back it off slightly.

Let us know if that solved the problem. Thanks.
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Old 06-18-2015, 11:15 PM   #17
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Hi,

Thanks again for quick reply.

Please I would like just to seek some advices further clear my misconception of the “Loose Jumper Washer” in Stopcock is originally intended to be a “loose” component in nature? Or not to be confused with the “faulty loosen jumper” which I could have been misunderstood of reading from some web site’s descriptions of possible root cause of water hammer noises?

Attached two files shown the internal structure of Stopcocks diagram for your reference.

Best Regards.
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Old 06-19-2015, 08:33 AM   #18
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It's possible, but not likely it's a loose jumper in the valve causing the water hammer because the valve is normally opened.

If that is the case, then you would have to narrow down what valve(s) it's coming from, then either rebuild or better yet replace the bad valve. This could be time consuming in an apartment complex such as yours.

Like your maintenance building supervisor said, give it a couple days and see if what he did fixes the problem.

Others will be along with more suggestions/advice.
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Old 06-19-2015, 10:23 AM   #19
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I always run stopcocks full open.

I don't normally associate occasional water hammer with a partially open stopcock. Usually they hum, shudder, or vibrate as the turbulent water tries to flow past the floppy rubber seal that's positioned right in the middle of where the water wants to go. But I suppose they could also hammer when water pressure / water usage varies.

If the rubber washer is making noise, it's wearing out. Eventually, when you go to shut off the water, the degraded washer will make a poor seal and be unable to fully shut off the flow of water.

As for scaling, I suppose the risk of freezing might be slightly higher on a fully open valve that lacks a back seat (a second sealing washer that protects the shaft packing from water pressure when fully open). But a valve with a back seat should be opened all the way, hard up against the stop. By keeping water out of the shaft packing, it should be much less likely to corrode or scale and be frozen when you need to close it.
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Old 06-20-2015, 07:37 AM   #20
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Water Hammer Noise Caused by Faulty Water Pipe System


Hi, Many thanks for your prompt reply and information.

I have clearer understanding now of main stopcock should be fully open position and the internal loose jumper washer is a floppy rubber seal with a small free play space which it may not generate a high knocking sound that associate to water hammer noise, nevertheless the unusual sounds heard were from the water pipe structure and I think suppose there a loosen component that “vibrate and shudder” could has created by a moving water shock wave? when a valve/tap turn off quickly.

Apparently the building water steel pipes structure were cemented through all base floors and it’s probably not create noises, if a section of pipe vibrate and knocking against the walls, hence the pipes inadequately fastened may not be in this case.

As suggested by the water department maintenance team officer, I would continue monitoring for next few days and update this problem accordingly.

Thanks again and best regards.
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Old 06-25-2015, 05:25 AM   #21
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Water Hammer Noise Caused by Faulty Water Pipe System


Hi All,
Update on the water pipes knocking noises status. Apparently we are on track to find the root cause, since last Thursday after Water Department maintenance team had turned the upper floor units main stopcocks to fully open position, the knocking noises has seems to "stop" for few days over last weekend.

On Monday the town council team has called to inform the decision is to replace new stopcock valves for 6th floor two house units and scheduled on Wednesday to eliminate the two suspects faulty stopcocks, indeed this is a positive step to solve the problem.

Now I am hopeful the root cause of many months long outstanding noises disturbance problem to be solved soon….Nevertheless, there remains two puzzles; (1) How does the upper floor neighbors claimed that never heard such noises when town council team carried out the investigation and involved them a few occasions, whereby the unusual knocking noises were occurred just right outside the main door entrance along the common corridor? (2) The loud knocking noises heard are probably caused by main stopcock not fully open or it may not be created by any loosen part or component within stopcock shaft packing, then could it be “a resonant vibration sound” cause by shock wave when large volume of water flows in pipes? Particularly when a valve/washing machine internal solenoid shuts quickly?

Thanks everyone here for supports and your valuable advices. I would say that I have learn many plumbing knowledge from this forum and I will update status again.

Best Regards.
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