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[LML] Looking for Toggle-type Alternate Static
Valve (LIVP
What was the conclusion of this search for an alternative to the
Clippard MJTV-3 valve controlling the door seal on the LIVP?
I noted my door seal valve deflated the door seal a couple times
today above altitude 10K', something that is not observed on the
ground. A finger over the "EXHAUST" valve arrests this
cyclic phenom.
Have people found a simple solution. My door seal valve is
7 years old, so maybe a simple replacement is adequate.
http://www.clippard.com/store/display_details.asp?sku=MJTV-3
Jeff L
N334P (LIVP)
From: Tom Gourley
Sender: marv@lancaironline.net
Subject:
Re: [LML] Looking for Toggle-type Alternate Static Valve
Date:
Sun, 07 May 2006 19:45:29 -0400
To: lml@lancaironline.net
I know the type of
valve you're referring to. My Commander 112 uses one. You
might try calling Wentworth Salvage or maybe one of the following
links might help:
http://www.specialtymfg.com/m1toggle.htm
http://www.clippard.com/store/display.asp?dept_id=2000
http://specialtymfgco.thomasnet.com/category/miniature-valves-toggle-push-button-needle-valves
http://airinc.thomasnet.com/item/air-valves/humphrey-tac-valves/4v?&seo=110
Tom
Gourley
----- Original Message -----
From: Clark Still
To:
Lancair Mailing List
Sent: Saturday, May 06, 2006 4:53 PM
Subject:
[LML] Looking for Toggle-type Alternate Static Valve
I'm looking of a toggle switch-like valve to use for an alternate
static switch in my LIVPT. The Lancair IVP door seal
toggle valve looked perfect, but two I tested leaked during static
tests at the equivalent of 10,000 feet. I guess the seals
weren't designed for this type of pressure differential. In any
case, I need a valve that can easily adapt to the quarter
inch static lines (1/8" NPT I think) and has an electrical toogle
switch like handle. Any suggestions would be appreciated, Clark
Still (NY).
From: Leighton
Sender: marv@lancaironline.net
Subject:
inflatable canopy seals
Date:
Sun, 07 May 2006 19:46:59 -0400
To: lml@lancaironline.net
The recent discussions about the inadvertant deflation of a door seal
by apparently switching off the toggle valve has inspired me to relay
a different approach we've taken to operate the inflatable seals.
Instead of using the Clippard MJTV-3 toggle valve we are using a small
electric solenoid valve, ETO-3, also made by Clippard. When no
electric power is supplied to the seal pump assembly the seal is
vented through the valve. When power is applied the valve
directs compressed air to the seal and closes the vent line. So,
whenever the "cabin seal" switch is turned off the seal
automatically deflates. Or if the master is turned off it also
goes limp. Recently we did a retrofit installation of an
inflatable seal on John Halle's Legacy and decided to make it even
more idiot proof by putting a simple micro switchwired in
series, behind the canopy lever in the closed position so that
when the canopy is unlatched the seal also deflates. Works great
and is easier than reeducating the idiots. I'm sure there are
any number of small pneumatic solenoid valves that will do the job as
well.
On the subject of the seal pump assemblies, we've noticed that the
pressure switches that come with them have been arriving set at
about 22 psi which is too high and will cause the canopy or door to be
forced outward. Somewhere between 5 and 10 psi seems about
right. There is an adjusting screw between the spade terminals
on the pressure switch, although my first attempt at finding it caused
some head scratching as it was covered with a black coating of some
kind. Scrape it off and the screw can be turned counterclockwise
to reduce the pressure setting. I use a simple mechanical gauge
with a small hose hooked to the air output to set it.
Someone recently was looking for a toggle type air valve to use as an
alternate static source and said the MJTV-3 wouldn't
work. However, it should work fine if the exhaust port is
plugged making it a two way valve.
Leighton Mangels
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