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Randy,
Perplexing...
While I have certainly noted the pressure in the low side
rise and fall from thermal influence when parked in the hangar(up to ~1000 psi),
I do not recall having the high side follow this trend. In the extended
position the lowest resistance path to the reservoir has been closed off.
Theoretically both sides could hold pressure, up to relief valve
settings, if pressurized by some means. The high side would lag very
far behind since the entire high side circuit would
be depressurized and hoses completely relaxed before any thermal
influences would start building pressure.
I can run another hair dryer test on the bench
similar to what I did to demonstrate the up-side behavior with
thermal heating and cooling of the cylinders. I'm not sure what to
expect.
As far as momentary pump starts are concerned. I have
such an over-ride circuits built right into the panel. They are
nothing more than momentary push buttons that jumper across the pressure
switches. These were installed during the time of a previous
generation of pressure switches which had a habit of sticking
open.
Chris
Chris Zavatson
N91CZ
360std
www.N91CZ.com
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