On Wednesday, 24 October 2012 12:34:22 UTC+1, Onetap wrote:
It's how a hydraulic ram works.

No, if you have water hammer, your hydraulic ram stops working. An effective ram relies on the air spring, and in getting nearly all the energy of the ram into that air spring, from where it can then be usefully made use of. All water hammer does is to make your valves bounce.

(And unlike you, I've built rams, and they worked)