On Wednesday, October 24, 2012 9:50:53 PM UTC+1, Andy Dingley wrote:

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)

How does it generate a higher pressure pulse than the pressure of the water stream?

By bringing the water stream to a sudden halt and converting the kinetic energy into pressure.

And what is this effect called?

Water hammer. http://en.wikipedia.org/wiki/Water_hammer#Applications

"The water hammer principle can be used to create a simple water pump called a hydraulic ram."

http://en.wikipedia.org/wiki/Hydraulic_ram

"The device uses the water hammer effect to develop pressure that allows a portion
of the input water that powers the pump to be lifted to a point higher than where the water originally started."

Unlike you I am neither a patronizing dullard nor wrong.

I shall expect your apology shortly after you grow a spine.