Never seen one before and am absolutely facinated.
Does someone understand the physics so much as to tell me what would happen if you'd block the fist checkvalve top, so that it wouldn't leak half the water from there? Does it stop the water from activating the valve?
Its actually not that complicated. the key to it all is the spring operated flap valve - how strong the spring is and its range of travel.
Water flows down a feed pipe, building up kinetic energy.
When it is travelling fast enough, it carries the flap valve with it and slams shut
This sudden stop builds a pressure pulse within the water - which momentarily flows through a second NRV (non-return-valve) - into a second chamber and away up a delivery pipe to wherever you want to use it
With the water now at a stand-still, the spring can overcome the pressure of the water in the feed pipe and open, allowing water to begin flowing again.
The cycle is continuous and I seem to recall that 60 to 100 beats per minute are the most efficient.
Still trying to find my video, but Photobucket is having a hissy fit!
Ogri the trog