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1. 08:42 PM - pneumatic system woes (Elmar & Manuela Hegenauer)
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| Subject: | pneumatic system woes |
Keith and others,
I usually have my all my check valves
on my CJ overhauled with every annual.
For that purpose I have stocked up springs
and rubber pads but I can't remember the
supplier :-(
To make a long story short, all those rubber
pads I have used over the years have failed
sooner or later between the annuals, so I
got curious.
Now let's get technical, Brian Lloyd are
you still alive?
The rubber pad in a CJ check valve has a
nominal diameter of 13 mm what translates
into a area of circle of roughly 132 square
millimetres or 1.32 square centimetres.
The physical weight introduced to this little
piece of rubber is around 66kgs/145 lbs at
50 bars/700 psi.
That is a lot of pressure on a small rubber disc
going against the sharp and perforated
seat of the lower check valve assembly.
I have done some tests in my workshop at factor
1.5 over a period of several months and the rubber
pads all disintegrated (with and without air tool oil),
the material seems to be too thin and soft!!!
Any constructive thoughts or ideas?
cheers
Elmar
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