Not sure what you mean by this. Mine is a cylinder shape with a shuttle
inside.
It is charged with nitrogen. When the engine is running the oil is forced
(3
quarts) into the accumulator until equilibrium is reached. Before shutting
down
the engine a manual valve is closed. It could also be done remotely using
an
electric normally closed solenoid valve. I typically have a 70+ psi
charge of
oil to use when starting my engine. I can also easily remove the
accumulator, I
have it mounted on my seat back. When really cold I can remove it, I have
used
hydraulic quick disconnects which do not leak. I can take it to my hotel
room
and keep it warm by a heater. My mounts are also useful for an Oxygen tank
as
well for high altitude flights

THAT is too cool.

And, sadly, it would NEVER be approved for flight in a certificated
aircraft...

:-(
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"