X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 06 Feb 2008 15:49:25 -0500 Message-ID: X-Original-Return-Path: Received: from p01c11o145.mxlogic.net ([208.65.144.68] verified) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTPS id 2717968 for lml@lancaironline.net; Wed, 06 Feb 2008 13:45:23 -0500 Received-SPF: none receiver=logan.com; client-ip=208.65.144.68; envelope-from=dave@edt.com Received: from unknown [198.107.46.129] (EHLO swift.edt.com) by p01c11o145.mxlogic.net (mxl_mta-5.3.0-3) over TLS secured channel with ESMTP id 2400aa74.2741255072.343547.00-021.p01c11o145.mxlogic.net (envelope-from ); Wed, 06 Feb 2008 11:45:22 -0700 (MST) Received: from CO2 (dhcp-97 [198.107.47.97]) by swift.edt.com (8.13.8+Sun/8.12.9) with SMTP id m16IifEB019835 for ; Wed, 6 Feb 2008 10:44:41 -0800 (PST) X-Original-Message-ID: <009001c868f0$5639afc0$612f6bc6@CO2> From: "David Lowry" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] 235/320/360 gear dump valve idea X-Original-Date: Wed, 6 Feb 2008 10:44:37 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_008B_01C868AD.44F2E8A0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 X-Spam: [F=0.0100000000; S=0.010(2008012801)] X-MAIL-FROM: X-SOURCE-IP: [(unknown)] This is a multi-part message in MIME format. ------=_NextPart_000_008B_01C868AD.44F2E8A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable This is exactly how the Legacy gear system is designed. 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 system 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 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. ------=_NextPart_000_008B_01C868AD.44F2E8A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

This is exactly how the Legacy gear = system is=20 designed.

With the way the hydraulic system is = currently=20 designed, you equalize the pressure on the high and low sides when it = is=20 opened. For those of us who have pressure gauges, you can see that you = can=20 have significant pressure on the system even when the valve is opened. = I want=20 to be able to not only equalize the pressure between the high and low = sides of=20 the hydraulic system with the dump valve but also release the pressure = on both=20 sides.

Today I purchased a 3 way valve to do just that. The = idea =20 is to open the valve connecting the high and low sides and = also=20 releasing the pressure back to the tank.
I will most likely run a = low=20 pressure line like nylaflow back to the pump and make spin up a custom = fitting=20 on the lathe out of aluminum to go into the dipstick hole and = terminate the=20 return line there. I will make a needle dipstick checker that will = screw into=20 the same fitting for checking fluid level.
If you wanted to do it = the easy=20 way, you could always just dump the low pressure line out the belly of = the=20 airplane onto the ground. It would take very little fluid to drop the = pressure=20 and there would be no need to deal with connecting the low pressure = fluid line=20 to the tank.
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