Water hammer from unvented cylinder

Taconite5 · 2026-06-08T08:57:24+0100

Johntheo5 said:
I would suggest installing it before the PRV because the PRV closes when the upstream pressure is > 3.0bar so the arrestor wouldn't be of any benefit if installed on the balanced cold, (if the hammer is in the mains leg), the UVC EV should act as a arrestor to relieve the pressure in the balanced ~~main~~ cold if this is where the hammer is occuring as the ICG NRV will then open in the UVC direction.

Wait isn’t the NRV between the balanced cold and the UVC EV/cylinder feed? It’s what stops hot water going back into the balanced cold?

Taconite5 · 2026-06-08T09:06:10+0100

dilalio said:
Can you do a video and post it on YouTube?

Sure can - which bit do you want to see?

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Water hammer from unvented cylinder

Taconite5

Taconite5

DIYnot Local

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