On Sun, 31 Jul 2005 11:06:49 +1000, the opaque "Murphy"
clearly wrote:

I am learning about hydraulics presently and am fascinated by their
simplicity and potential. There are a number of issues that are still
unclear to me and I would be appreciative if someone could answer these
questions if I post them here from time to time...

Get thee to the library and read up! Or grab inexpensive books off
www.Half.com , www.Ebay.com , etc.

Audel put out some, like "Pumps, Hydraulics, & Air Compressors",
"Pneumatics & Hydraulics", etc. Audel books are all KEEPERS! I have
half a dozen of them now covering quite a range of subjects. (They'll
be better than gold after "the fall." /survivalism)

I've found others on Ebay like "Let's Get Into HYDRAULICS, Farm
Equipment ELECTRICAL SYSTEMS, Hydraulic Systems DIAGNOSIS", a
collection of articles from Implement & Tractor Magazine. It covers
both theory and troubleshooting.


The first being with regards to the hydraulic pump. It appears that 2200 PSI
is a standard line pressure used in hydraulics, do all pumps produce this
pressure with the variation between pumps being the flowrate or are all
pumps basically the same with the flow rate and pressure being determined by
the power source for the pump ?

Pumps of a given displacement are designed for a certain flow and
pressure. Variable-displacement pumps are one exception. Valving
can alter flow, too, as can regulation.


For example does a pump produce either high pressure at a low flow rate or
low pressure at a high flow rate with the flow rate and pressure determined
by the power source ?

I'm fascinated by it, too. From what I've read, flow is pretty much
set by the pump volume @ RPM and pressure is adjustable within a given
range as determined by the type of regulator.


--
Guns don't kill people. Rappers do!
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