Randy,
I’m not getting this
concern. The dump line goes to the tank and ends submerged in fluid with
a ¼” down tube in the reservoir. Additionally, in my opinion no fluid
would ever travel upstream toward the valve. Thus, no air would be added
to the system by use of a 3 way vavle.
Larry
From: randy
snarr [mailto:randylsnarr@yahoo.com]
Sent: Sunday, February 10, 2008 9:59
PM
To:
lml@lancaironline.net
Subject: Re: [LML] Re: 235/320/360 gear
dump valve idea
Chris,
Is there such a thing as a check valve that
could be incorporated into the 3rd pressure dump line to the hyd
reservoir?
That way you could open the dump valve releasing positive
pressure from the high/low sides of the system but you would not be allowing
air from that same line if the was no positive pressure or negative
pressure?
Could a shuttle valve help do that?
Randy
Snarr
Chris
Zavatson <chris_zavatson@yahoo.com>
wrote:
<<From: Randy
<randystuart
Then
the pump pressurizes the high side and it stops, and the shuttle valve
centers,...>>
This is where pumps in the fleet differ. In my
two pumps the shuttle valve does not return to center. It stays where
the fluid last pushed it. The O-ring on the spool offers up much more
friction than the spring on the poppet valve could ever hope to
overcome. I am curious if all pump vintages have O-rings on the spool
valve and/or how snug the fit might be? If the spool can be made
to stay put, the problem goes away. I am simply suggesting this as
something to investigate before a lot of new plumbing is added to the
system.
A little over a year ago, when this issue was last
discussed, I took a series of photos showing the effect of heating and
cooling. What is observed is that the high side pressure goes up and
down with temperature (heat gun and ice bath) while the low side
remains at zero.
My pumps are '95 and
newer.
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