the IV bag could be put in a housing with holes drilled in it. You would be
able to see
oil levels easily as there is a calibration on the bags. ie you would take
a note of the
oil level with all the pistons retracted. I don't know how large an orifice
they have or what
volume of oil per minute would & could be pumped into them.
Just thinkiing outside the box again.
----- Original Message -----
Sent: Monday, March 29, 2010 5:34
AM
Subject: Re: [PSUBS-MAILIST] Rudder
Indicator using 3 Reed Relays
In a message dated 3/27/2010 1:52:59 P.M. Pacific Daylight Time,
vbra676539@aol.com writes:
How will you seal one to the
other?
Hi Vance. I'll try using clear vinyl tubing and hose barbs to connect the
oil lines between the bladder and components needing pressure compensation.
The rubber CV boot can have a small air bubble at the top if there's a few
small ones that work their way through the system. That's what the fill/bleed
valve is for. There shouldn't be any pressure differential in the system as
the flexible bellows will expand and retract as needed.
For sealing I'm using the same stuff as the electrical wires. Brass hose
barb fittings threaded into the components and thru-hulls, vinyl tubing
and hose clamps, then all the connections get covered with a coating of
Vulchem. It's a liquid form of polyurethane that can be painted on. It looks
like that "plasti-dip" stuff for dipping tool handles in, except it sticks
better.
Alan..... I was just looking at the pictures you put up
with the wooden scale model of the actuator filled
with water. It looks like it's sealed up with no where for the
water to go so the bellows doesn't expand or collapse, but just deforms.
I think the IV bag idea might work but not sure how tough it would be,
or resistant to sunlight and abrasion. Frank
D.