X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 06 Nov 2007 21:18:06 -0500 Message-ID: X-Original-Return-Path: Received: from dmzmta102.na.baesystems.com ([149.32.252.102] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTPS id 2458920 for lml@lancaironline.net; Tue, 06 Nov 2007 17:01:53 -0500 Received-SPF: none receiver=logan.com; client-ip=149.32.252.102; envelope-from=Christopher.Zavatson@baesystems.com Received: from BLUMS0033.bluelnk.net (blums0033.bluelnk.net [10.40.96.54]) by dmzmta102.na.baesystems.com (Switch-3.2.5/Switch-3.2.5) with ESMTP id lA6LxPrW009520 for ; Tue, 6 Nov 2007 16:59:25 -0500 Received: from usdmta001.na.baesystems.com ([10.40.96.57]) by BLUMS0033.bluelnk.net with InterScan Message Security Suite; Tue, 06 Nov 2007 17:01:14 -0500 Received: from GLDMS00005.goldlnk.rootlnka.net ([10.44.64.11]) by usdmta001.na.baesystems.com (Switch-3.2.0/Switch-3.2.0) with ESMTP id lA6LwZrT017633 for ; Tue, 6 Nov 2007 16:58:36 -0500 Received: from gldms10602.goldlnk.rootlnka.net ([10.64.39.19]) by GLDMS00005.goldlnk.rootlnka.net with Microsoft SMTPSVC(6.0.3790.3959); Tue, 6 Nov 2007 17:01:14 -0500 Received: from GLDMS10607.goldlnk.rootlnka.net ([10.64.39.20]) by gldms10602.goldlnk.rootlnka.net with Microsoft SMTPSVC(6.0.3790.1830); Tue, 6 Nov 2007 14:01:13 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C820C0.8AC5B4CD" Subject: RE: [LML] Re: LNC2 Hyd Chirp Tim/ Joe/ Brent Question X-Original-Date: Tue, 6 Nov 2007 14:01:11 -0800 X-Original-Message-ID: In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] Re: LNC2 Hyd Chirp Tim/ Joe/ Brent Question Thread-Index: AcggvA30nRlJ22L6QDKJEqgOTsL4AwAASw4Q References: From: "Zavatson, Christopher J (US SSA)" X-Original-To: "Lancair Mailing List" X-OriginalArrivalTime: 06 Nov 2007 22:01:13.0648 (UTC) FILETIME=[8C1B7B00:01C820C0] This is a multi-part message in MIME format. ------_=_NextPart_001_01C820C0.8AC5B4CD Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Randy, The next thought experiment might by to ask whether or not your (and Lorn's) spool valve is returning to center for some reason after pump shut down. That would allow pressure to build in the low and high sides simultaneously. Generally it takes quite a bit of force to move the spool valve around. The O-ring provides a lot of friction. Two things are obvious though. First, the valve is working properly while the pump is running since you (and Lorn again) see zero pressure on the low side. The second constant is that when the pump is not running and actively pushing the spool valve against the poppet valve, your systems are sealing themselves up. If your spool valve had very little or no friction I could see this happening. The poppet valve does have a very light spring to help close it when not subjected to any other forces. This video was posted previously. It shows the system responding to an intentional leak from high to low. The pump cycles repeatedly without affecting the low side pressure reading. www.N91CZ.com/VideoClips/Pump_Cycling_1.wmv Randy, the answer is out there........somewhere. Chris ------_=_NextPart_001_01C820C0.8AC5B4CD Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Randy,
The next thought experiment might by to ask = whether or not=20 your (and Lorn's) spool valve is returning to center for some reason = after pump=20 shut down.  That would allow pressure to build in the low and high = sides=20 simultaneously.  Generally it takes quite a bit of force to move = the spool=20 valve around.  The O-ring provides a lot of friction.  Two = things are=20 obvious though.  First, the valve is working properly while the = pump is=20 running since you (and Lorn again) see zero pressure on the low = side.  The=20 second constant is that when the pump is not running and actively = pushing the=20 spool valve against the poppet valve, your systems are sealing = themselves=20 up.  If your spool valve had very little or no friction I = could=20 see this happening.  The poppet valve does have a very = light=20 spring to help close it when not subjected to any other=20 forces.
This video was posted previously.  It = shows the system=20 responding to an intentional leak from high to low.  The pump = cycles=20 repeatedly without affecting the low side pressure = reading.
www.N91CZ.com= /VideoClips/Pump_Cycling_1.wmv
Randy, the answer is out=20 there........somewhere.
Chris
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