X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 08 Sep 2012 18:22:17 -0400 Message-ID: X-Original-Return-Path: Received: from nm37.bullet.mail.ne1.yahoo.com ([98.138.229.30] verified) by logan.com (CommuniGate Pro SMTP 6.0c1) with SMTP id 5751013 for lml@lancaironline.net; Sat, 08 Sep 2012 12:04:28 -0400 Received-SPF: none receiver=logan.com; client-ip=98.138.229.30; envelope-from=chris_zavatson@yahoo.com Received: from [98.138.90.51] by nm37.bullet.mail.ne1.yahoo.com with NNFMP; 08 Sep 2012 16:03:52 -0000 Received: from [98.138.89.193] by tm4.bullet.mail.ne1.yahoo.com with NNFMP; 08 Sep 2012 16:03:52 -0000 Received: from [127.0.0.1] by omp1051.mail.ne1.yahoo.com with NNFMP; 08 Sep 2012 16:03:52 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 304971.88230.bm@omp1051.mail.ne1.yahoo.com Received: (qmail 60219 invoked by uid 60001); 8 Sep 2012 16:03:52 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=Mo7mu7b5pk8Jl2fYeDcquoBuj94Cejm/fB/VPwGg15nmjPJQpVkkWX4uhPuOWKlgXM79zSNvu6m9vt6AyDs9mXC/bIX2L2HJCHfLp3rwo1xyio+O8hROh7fnrPcEtVoG3fwsP6uD+2yV2wsmHZXnFgnFpCb4n+vLGeH6+acBPKw=; X-YMail-OSG: L6UKC98VM1kI8_E0cijFKeCD8OYE_1DHGtlDoWzoBVmTuid Mqmwsj95oFopG6iTXQJsL4eNLxba1U0OraK4sp.Qxw7Ju5Dosw.04NKyCEUE 6hxhQEYl2cP.A_rDmsLsSyEA93923YqDoEV5Qou3Um8vPv5poKY4daqY5f9R wSuQdDT2Tih1i0iOIUecolR.L.STlxIeNfJgaRotefl4AWJ_B.5K7TxMETMX oqzyQbDnbe.fLcw18f9w41jR7lCz9tjUFrPYR.47KTFS24oL9vFE9DI6enuI K70SuRNnDYQafN2bYHGin8ncIeFxCyLBCR4_uDsF0Y6vzwFytT7JDT6.3SvH KUpz6kXmMf5BIJhpqdepVjuYXx96u1MwrtOLbFuPZp8l9Hm2MgVAUUJuQCo_ QXRnkgeDB33QtmiyRnbskpQgTmD2Ay2DqAVMvTP7gQz3cEDqqlF.4Eof5dfz OXglbOPyWhoT69UrAcFCj_mlcIqDbJpfdJVHFl4zpmC2zG4whtSQez.BHcql fUMUb.YYRysNlhYr_MAQhtOAY6.BUQFjTE9S46piS0IMYhYj1uIEjCH_MMes u88GPQA0tw_gb0E0NSIPpgV6HRiuMHxd.U0LidQ3GAv9BIJUqUQS5uutzvQ6 6rjLaWFcJrA-- Received: from [76.246.61.55] by web121601.mail.ne1.yahoo.com via HTTP; Sat, 08 Sep 2012 09:03:52 PDT X-Mailer: YahooMailWebService/0.8.121.416 References: X-Original-Message-ID: <1347120232.49201.YahooMailNeo@web121601.mail.ne1.yahoo.com> X-Original-Date: Sat, 8 Sep 2012 09:03:52 -0700 (PDT) From: Chris Zavatson Reply-To: Chris Zavatson Subject: Re: [LML] Adjustable Thermal Relief Valve X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-1977980688-310572716-1347120232=:49201" ---1977980688-310572716-1347120232=:49201 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Below is link to a video showing the pressure response of the lowered therm= al relief valve setting.=A0 It is about three minutes in length.=0Ahttp://w= ww.n91cz.com/misc/Adjusted%20TRV%20hi-res.wmv=0A=A0=0AChris Zavatson=0AN91C= Z=0A360std=0Ahttp://www.n91cz.net/=0A=0A=0A________________________________= =0AFrom: Chris Zavatson =0ATo: lml@lancaironline.= net =0ASent: Thursday, September 6, 2012 5:15 AM=0ASubject: [LML] Adjustabl= e Thermal Relief Valve=0A=0A=0AI couldn't help myself.=A0 After thinking ab= out the discussion regarding thermal expansion of the hydraulic fluid, I we= nt out to the hangar and opened up the Oildyne pump=A0I use on=A0the test s= tand.=A0 I removed the high side thermal relief valve and added a check nut= , much like is found on the pressure relief valves.=A0 Full engagement of t= he thermal relief valve spring is very close to=A0two full revolutions of t= he assembly.=A0 I backed this off one half turn and tightened the check nut= .=0AAfter=A0everything was put back together, I powered up the system and s= tarted heating the fluid.=A0=A0When=A0system pressure=A0reached about 1800 = psi, the thermal relief valve (TRV) cracked.=A0=A0Pressure bled down about = 100 psi.=A0 With continued heating, the cycle continued -pressure cycling b= etween 1,700 and 1,800 psi.=A0=0AThis looks like a simple way to bring the = maximum obtainable system pressure down to a more reasonable level relative= to our normal operating pressures.=0AWrite-up and video to follow.=0A=A0= =0AChris Zavatson=0AN91CZ=0A360std=0Ahttp://www.n91cz.net/ ---1977980688-310572716-1347120232=:49201 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Below is link to a video showing the pressure response of the lowered thermal relief valve settin= g.  It is about three minutes in length.
 
Chris Zavatson
N91CZ
360std

From:= Chris Zavatson <chris_zavatson@yahoo.com>
To: lml@lancaironline.net
Sent: Thursday, September 6, 2012 5:= 15 AM
Subject: [LML] Adj= ustable Thermal Relief Valve

I couldn't help myself.  After thinking about the discussion rega= rding thermal expansion of the hydraulic fluid, I went out to the hangar an= d opened up the Oildyne pump I use on the test stand.  I removed th= e high side thermal relief valve and added a check nut, much like is found = on the pressure relief valves.  Full engagement of the thermal relief = valve spring is very close to two full revolutions of the assembly.&nb= sp; I backed this off one half turn and tightened the check nut.
After everything was put back together, I powered up the system a= nd started heating the fluid.  When system pressure rea= ched about 1800 psi, the thermal relief valve (TRV) cracked.  Pressure b= led down about 100 psi.  With continued heating, the cycle continued -pressure cycling bet= ween 1,700 and 1,800 psi. 
This looks like a simple way to bring the maximum obtainable system pr= essure down to a more reasonable level relative to our normal operating pre= ssures.
Write-up and video to follow.
 
Chris Zavatson
N91CZ
360std


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