Automotive PS pumps pump Way more than 1/6gpm, much less than 3000psi,
and bypass all unless the steering is deflected. Diesel pumps, at least
VW, pump 20+bar in pulses-no good for you prolly. The back end (second
stage)of a Barnes log splitter pump will work, but you will need to
deadhead the front end LP circuit to get it to shift. Output gpm will
still be high without a bleed circuit.
JR
Dweller in the cellar


RoyJ wrote:
My latest research project needs a small hydraulic pump, quite a bit
smaller than a standard pump. Plan to drive it with a VFD/3phase motor.
I'd like to get it running by next week so cheap and fast are the
buzzwords.

General specs:
-3000+ psi
-1/6 gallon per minute
-decent duty cycle (run for several hours at a time)
-1750 rpm would be nice (direct drive off a 3 phase motor)
-cast iron case highly desirable (aluminum doesn't hold up well to the
environment
-adjust the output by VFD speed control (trying to avoid a needle valve
and bypass)

I could derate one of these units
http://www.surpluscenter.com/pages/032.pdf
but I'd like to start with something smaller and with a cast iron case

Is there something from the vehicle area that might work better? Diesel
injector pump? Power steering pump? Off the shelf commercial unit that
I'm not finding???

--
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Home Page: http://www.seanet.com/~jasonrnorth
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Dependence is Vulnerability:
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