Re: Water cutter

Dan Mauch wrote:

> By knowing the pressure on both sides of the piston you will see whcih way
> the piston must move. A differential piston may work better. Hmmmmmmm!
>
> There seems to be something missing and I'll have to think about what it is.

Yes, most certainly, you need a piston with 2 different diameters. Often a
10:1 area ratio is used. The lower pressure pushes on the large end of the
piston, the smaller end pushes the liquid out the nozzle at approximately
10 x the pressure. This is how the fuel injectors on most Diesel engines
work. the put an intensifier right in the injector body, so they only have to
pipe ~1000 PSI fuel, and the 10,000 PSI fuel is only in the small space
between the piston and the nozzle.

Jon