Pressure washers

[Alex Wolfe <awolfe_98@yahoo.com>]

  I like the pressure washer idea... but... wouldn't the motor burn out
in short order with no cooling fluids actually moving through it?  Also
if I'm not mistaken (which I certainly could be) if you have a
centrifugal pump arrangemenet in which no water is allowed to exit
(i.e. up to pressure), the water int the "spinning part" will approach
the angular momentum of the impelers, causing less and less rotational
resistance... and the motor winds up speeding up something fierce?  I
wonder if it's a piston drivin pump... do such things exist?  I guess
piston pump with overpressure relief would be good.  Hmm.  
  What about a hydraulic ram?  As uncompressible as water is, I would
imagine it would take *very* little compression of the liquid to get
1400 lbs over ambient in a sealed vessel.  How about a cylinder coming
out of the side( or for construction simplicity, just allow the ram
itself to enter the internal fluid area), and a 2-4 ton ram pushing a
fitted piston down into it?  Could be hand powered.  Hmm.

Alex
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