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Hi Ed,
I have a similar door on my hanger, it is 30ft wide and made of steel
sq-tubing. It is lifted by two hydr cylinders through a knee-lever which goes
over dead center at full open. I had to install a hand valve on one side for
balancing the opening and closing with changing temperature. This is much
simpler than an automatic balancer, and it will not work without any balancing.
There was no leak or any other problems in 7years of operation.
One safety feature I installed is a temporary pushbutton switch, which
makes it impossible to walk away while the door is opening. This makes me watch
the door all the time while it is going up or down. Some times, I even open the
door only partially and leave it there all day long on the hydraulics without
any problem.
I think you did the right pick with the hydraulics.
FWIW.
Richard Sohn
N-2071U
----- Original Message -----
Sent: Monday, August 14, 2006 4:54
AM
Subject: [FlyRotary] Re: Emailing:
DoorOpenLside.jpg
Hi Jarrett,
Actually, I believe that if the hose breaks
anywhere the pressure will drop everywhere
and the two cylinders will both lower (more or less) together. I could
be wrong about that, but until an hydraulic expert tells me otherwise, that is
what my eyeball analysis indicates to me.
Ed
----- Original Message -----
Sent: Monday, August 14, 2006 12:11
AM
Subject: [FlyRotary] Re: Emailing:
DoorOpenLside.jpg
Ed, looks like you have it well in hand.. any plan however, for a hose
break [or leak over time] which would lower one cylinder but not the
other?
Jarrett
----- Original Message -----
Sent: Sunday, August 13, 2006 9:52
PM
Subject: [FlyRotary] Re: Emailing:
DoorOpenLside.jpg
Good Idea, Lynn. Screw the hose in one side of the
aluminum block, up flow pushes through the restrictor and check valve,
back flow closes check valve and only flows through
restrictor. Shouldn't be that hard to make.
Thanks
Ed
----- Original Message -----
Sent: Sunday, August 13, 2006 11:36
PM
Subject: [FlyRotary] Re: Emailing:
DoorOpenLside.jpg
Not a bad idea, Ben. They would slow down
the opening a bit, but would probably slow down the closing even
more. I'll check into it.
Ed
Assemble a swing check valve in parallel with your restrictor. So,
most of the up flow is unrestricted and any downflow closes the check
valve and goes through the restrictor.
Or machine the whole thing in a small block of aluminum.
Lynn E. Hanover
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