bigmike
You will not be able to replicate this by hand using the flush lever.
You were at the exact spot where the mechanical valve was just open enough and then the water pressure going through the lines was just enough to close it again. Hence all of the cavitation or in this case, really, just on and off.
It will take some time, I guess to replicate this but you have found the exact spot where this happened.
That weekend you should have done the lottery!!
Not every scenario can be thought of in the design on this particular one would be impossible to design out of ever happening again.
Donāt forget, the actual pump on and off is controlled by the pressure sensing circuit . The water path is opened by the mechanical valve Which at the start of a shot reduces the pressure to zero. The pump stops when the pressure is reached and then the non return valves then take over.
When using normally for a shot the flush lever is not a flush lever. It is just the linkage between the cam on the main lever and the plunger for the water valve.
Two terms commonly linked to the Evo are very confusing when you do not fully understand what is happening. The first one is flush lever. The second one is pre-infusion pressure.
I am not sure what I would call the pre-infusion pressure. Something along the lines of pump trip set point. Well that is quite a mouthful. I agree.
For what is a very simple machine to operate, the actual design and implementation is actually very clever.
