X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 08 Feb 2008 15:13:56 -0500 Message-ID: X-Original-Return-Path: Received: from wa-out-1112.google.com ([209.85.146.176] verified) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTP id 2720448 for lml@lancaironline.net; Fri, 08 Feb 2008 00:50:21 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.146.176; envelope-from=vonjet@gmail.com Received: by wa-out-1112.google.com with SMTP id j4so213873wah.1 for ; Thu, 07 Feb 2008 21:49:41 -0800 (PST) DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=aw5n+Eywu3PGX26rvRNBarScCB6Zr996L43S2TfrkDmwt+OYyIYNFD6xOVRFKcMrTOjttFEJZTMYi9ZTveonXpR2affjxsJTPcmxa3esobYXgFX5igJ6tbPS9IQFpkfUOsY4vJqx5jRqHOnC5DWHdDyUZWklrTUm+S7xABs1AEM= Received: by 10.114.52.1 with SMTP id z1mr2542861waz.123.1202449781428; Thu, 07 Feb 2008 21:49:41 -0800 (PST) Received: by 10.115.89.2 with HTTP; Thu, 7 Feb 2008 21:49:41 -0800 (PST) X-Original-Message-ID: X-Original-Date: Thu, 7 Feb 2008 21:49:41 -0800 From: "Bryan Wullner" X-Original-To: "Lancair Mailing List" Subject: Re: [LML] FW: [LML] 235/320/360 gear dump valve idea In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_803_33345393.1202449781420" References: ------=_Part_803_33345393.1202449781420 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Randy, When I removed the plug in my pump a spring and a steel ball came out. Do = I remove these and then Install the 1/4" return line to this port? Bryan On Feb 7, 2008 10:34 AM, LHenney wrote: > Randy, > > > > Hold off on the machine work. Your pump is designed with a third port > (between the two now in use). It is threaded and ready for your return > line. A =BC " tubing can be installed as a down tube in the tank (mine c= ame > with the tube installed). > > > > Also, Randy Stuarts idea of a T shuttle sounds very, very interesting. I > don't completely know what a T shuttle valve is however. Thus, I'm > grappling with check valve analogies and getting a lot of "how would that > work?" thoughts. Does this mean pressure on up circuit triggers opening= of > shuttle from down circuit, therefore T goes to third port??? I'm tempted= to > like this idea. Additionally, could second T also tie in to third port a= nd > allow 3 way dump common path to reservoir. Please tell us more R. Stuart= =85.. > > > > Larry Henney > > N360LH > > Much less chirping lately after changing out pump O rings; Lancair also > got more pressure gauges in stock and shipped mine. > > > ------------------------------ > > *From:* Sky2high@aol.com [mailto:Sky2high@aol.com] > *Sent:* Wednesday, February 06, 2008 2:49 PM > *To:* lml@lancaironline.net > *Subject:* Re: [LML] 235/320/360 gear dump valve idea > > > > Randy, > > > > Remember that the reservoir needs a small vent hole so that air pressure > or vacuum does not build up in the reservoir itself. Usually the vent is= in > the filler cap or its threads. > > > > Scott Krueger AKA Grayhawk > Lancair N92EX IO320 SB 89/96 > Aurora, IL (KARR) > > Pilot not TSO'd, Certificated score only > 70%. > > > > > > In a message dated 2/6/2008 11:29:13 A.M. Central Standard Time, > randylsnarr@yahoo.com writes: > > With the way the hydraulic system is currently designed, you equalize the > pressure on the high and low sides when it is opened. For those of us who > have pressure gauges, you can see that you can have significant pressure = on > the system even when the valve is opened. I want to be able to not only > equalize the pressure between the high and low sides of the hydraulic sys= tem > with the dump valve but also release the pressure on both sides. > > Today I purchased a 3 way valve to do just that. The idea is to open the > valve connecting the high and low sides and also releasing the pressure > back to the tank. > I will most likely run a low pressure line like nylaflow back to the pump > and make spin up a custom fitting on the lathe out of aluminum to go into > the dipstick hole and terminate the return line there. I will make a need= le > dipstick checker that will screw into the same fitting for checking fluid > level. > If you wanted to do it the easy way, you could always just dump the low > pressure line out the belly of the airplane onto the ground. It would tak= e > very little fluid to drop the pressure and there would be no need to deal > with connecting the low pressure fluid line to the tank. > > I hate pulling the airplane out of a cool hanger into the warm sunshine > and watching the gear pressures rise to 6-700 lbs before the master switc= h > is turned on! We all know what happens when they hit 900. Yep no gear > retraction as the upper limit has been tripped by the system pressure. > My new valve would fix that!!! > I hope... > > > > > > ------------------------------ > > Who's never won? Biggest Grammy Award surprises of all time on AOL Music.= > ------=_Part_803_33345393.1202449781420 Content-Type: text/html; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Randy,

When I removed the plug in my pump a spring and a steel ball = came out.  Do I remove these and then Install the 1/4" return lin= e to this port?

Bryan



On F= eb 7, 2008 10:34 AM, LHenney <LHe= nney@charter.net> wrote:

Randy,

 

Hold off on the machine work. = ; Your pump is designed with a third port (between the two now in use).  It is thr= eaded and ready for your return line.  A =BC " tubing can be installed as a down= tube in the tank (mine came with the tube installed).

 

Also, Randy Stuarts idea of a T sh= uttle sounds very, very interesting.  I don't completely know what a T shutt= le valve is however.  Thus, I'm grappling with check valve analogies and getting a lot of "how would that work?" thoughts.   Does this mea= n pressure on up circuit triggers opening of shuttle from down circuit, there= fore T goes to third port???  I'm tempted to like this idea.  Addition= ally, could second T also tie in to third port and allow 3 way dump common path t= o reservoir.  Please tell us more R. Stuart=85..

 

Larry Henney

N360LH

Much less chirping lately after ch= anging out pump O rings; Lancair also got more pressure gauges in stock and shippe= d mine.

 

From: Sky2high@aol.com [mailto:Sky2high@aol.= com]
Sent: Wednesday, February = 06, 2008 2:49 PM
To: lml@lancaironline.net
Subject: Re: [LML] 235/320= /360 gear dump valve idea

 

Randy,

 

Remember that the reservoir need= s a small vent hole so that air pressure or vacuum does not build up in the reservoir itself.  Usually the vent is in the filler cap or its threads.<= /font>

 

Scott Krueger AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)

Pilot not TSO'd, Certificated score only > 70%.

 

 

In a message dated 2/6/2008 11:2= 9:13 A.M. Central Standard Time, randylsnarr@yahoo.com writes:

With the way the hydraulic syste= m is currently designed, you equalize the pressure on the high and low sides whe= n it is opened. For those of us who have pressure gauges, you can see that you c= an have significant pressure on the system even when the valve is opened. I wa= nt to be able to not only equalize the pressure between the high and low sides= of the hydraulic system with the dump valve but also release the pressure on b= oth sides.

Today I purchased a 3 way valve to do just that. The idea  is to open = the valve  connecting  the high and low sides and also releasing the pressure back to the tank.
I will most likely run a low pressure line like nylaflow back to the pump a= nd make spin up a custom fitting on the lathe out of aluminum to go into the dipstick hole and terminate the return line there. I will make a needle dipstick checker that will screw into the same fitting for checking fluid level.
If you wanted to do it the easy way, you could always just dump the low pressure line out the belly of the airplane onto the ground. It would take = very little fluid to drop the pressure and there would be no need to deal with connecting the low pressure fluid line to the tank.

I hate pulling the airplane out of a cool hanger into the warm sunshine and watching the gear pressures rise to 6-700 lbs before the master switch is turned on! We all know what happens when they hit 900. Yep no gear retracti= on as the upper limit has been tripped by the system pressure.
My new valve would fix that!!!
I hope...

 

<= br>


------=_Part_803_33345393.1202449781420--