Water hammer arrestors?

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Greenmountain

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I would assume that in an ideally plumbed boiler system they would not generally be necessary?
But anyone ever use them? Even with relatively slow flow any fast closing valve can cause some hammer, true?
Pros/cons for their use in a zone valved boiler system?
thanks
 

WorthFlorida

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It's a closed circulating system where the pressure on both sides of a valve closing is nearly the same, therefore no hammer.
 

Greenmountain

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I thought it was caused by "shock waves" from the impact of moving water being suddenly forced to stop?
Can't the impact waves still travel through the water and piping even in a closed system, regardless of pressure?
If I understand correctly, it's really just a problem with fast shutting valves. The more momentum, and the faster the valve shuts, the more potential for hammer.
 

Fitter30

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Hot water should never hammer unless zone valve piped backwards. Steam bringing everything up to system temp can hammer if piping or air bleeds aren't working properly.
 
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