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 bay0-omc2-s41.bay0.hotmail.com ([65.54.246.177] verified) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTP id 2720370 for lml@lancaironline.net; Thu, 07 Feb 2008 22:25:21 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.246.177; envelope-from=randystuart@hotmail.com Received: from hotmail.com ([65.55.139.25]) by bay0-omc2-s41.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.3959); Thu, 7 Feb 2008 19:24:41 -0800 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Thu, 7 Feb 2008 19:24:40 -0800 X-Original-Message-ID: Received: from 68.183.63.181 by BAY134-DAV15.phx.gbl with DAV; Fri, 08 Feb 2008 03:24:37 +0000 X-Originating-IP: [68.183.63.181] X-Originating-Email: [randystuart@hotmail.com] X-Sender: randystuart@hotmail.com From: "Randy" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: 235/320/360 gear dump valve idea X-Original-Date: Thu, 7 Feb 2008 19:24:34 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_008A_01C869BF.11EF3AE0" 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-OriginalArrivalTime: 08 Feb 2008 03:24:40.0863 (UTC) FILETIME=[24203AF0:01C86A02] X-Original-Return-Path: randystuart@hotmail.com This is a multi-part message in MIME format. ------=_NextPart_000_008A_01C869BF.11EF3AE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable What happens is, the shuttle valve in the pump opens the low side when = it forces fluid to the high side. This allows the fluid from the low = side to pass the shuttle port and direct the fluid back to the = reservoir. Then the pump pressurizes the high side and it stops, and the = shuttle valve centers, which closes the low port to the reservoir and = the high port to the reservoir. Here's where the problem starts. When = the valve closes the low side everything is fine..... UNTIL the low side = fluid expands from heat. At this point the fluid has no were to go = because the shuttle valve closed. The pressure switch opens from the = pressure and now you can't lower the gear until you release the pressure = on the low side.=20 Adding the extra shuttle valve, as I described should solve this problem = because it can direct the expending fluid back to the reservoir without = using the pumps shuttle valve.=20 A T-shuttle valve is just a small T fitting with a ball bearing inside = that rocks back and forth across two of the three ports of the T. It = directs fluid one way or another way depending on the pressure flow. = Works the same way as the one in pump except it won't close when the = flow stops. They cost about $5.=20 Randy Stuart LNC2 ----- Original Message -----=20 From: Chris Zavatson=20 To: lml@lancaironline.net=20 Sent: Thursday, February 07, 2008 4:43 PM Subject: [LML] Re: 235/320/360 gear dump valve idea Randy S,, et al <> I have often wondered why this is only occurring in some of our pumps, = more likely the older ones. The shuttle valve in current vintage pumps = requires significant force to move while the return springs on the = poppet valves is very light. Perhaps something as simple as an O-ring = change on the shuttle could eliminate the problem altogether with no = external plumbing changes needed. Chris Chris Zavatson N91CZ 360std www.N91CZ.com =20 -------------------------------------------------------------------------= ----- Looking for last minute shopping deals? Find them fast with Yahoo! = Search. ------=_NextPart_000_008A_01C869BF.11EF3AE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
What happens is, = the shuttle=20 valve in the pump opens the low side when it forces fluid to the high = side. This=20 allows the fluid from the low side to pass the shuttle port and direct = the fluid=20 back to the reservoir. Then the pump pressurizes the high side and it = stops, and=20 the shuttle valve centers, which closes the low port to the reservoir = and the=20 high port to the reservoir. Here's where the problem starts. When the = valve=20 closes the low side everything is fine..... UNTIL the low side fluid = expands=20 from heat. At this point the fluid has no were to go because the shuttle = valve=20 closed.  The pressure switch opens from the pressure and now you = can't=20 lower the gear until you release the pressure on the low side.=20
Adding the extra = shuttle=20 valve, as I described should solve this problem because it can direct = the=20 expending fluid back to the reservoir without using the pumps shuttle = valve.=20
A T-shuttle valve = is just a=20 small T fitting with a ball bearing inside that rocks back and forth = across two=20 of the three ports of the T. It directs fluid one way or another way = depending=20 on the pressure flow. Works the same way as the one in pump except it = won't=20 close when the flow stops. They cost about $5. =
 
Randy=20 Stuart
LNC2
----- Original Message -----
From:=20 Chris=20 Zavatson
Sent: Thursday, February 07, = 2008 4:43=20 PM
Subject: [LML] Re: 235/320/360 = gear dump=20 valve idea

Randy=20 S,, et al <<The problem is that when the = pump stops the=20 shuttle valve, in the pump, closes.>> I=20 have often wondered why this is only occurring in some of our = pumps, more=20 likely the older ones.  The shuttle valve in current vintage = pumps=20 requires significant force to move while the return springs on the = poppet=20 valves is very light.  Perhaps something as simple as an O-ring = change on=20 the shuttle could eliminate the problem altogether with no external = plumbing=20 changes needed. Chris       Chris=20 Zavatson N91CZ 360std www.N91CZ.com

 
Looking for last minute shopping deals? Find=20 them fast with Yahoo! Search. ------=_NextPart_000_008A_01C869BF.11EF3AE0--