X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 06 Sep 2012 08:15:35 -0400 Message-ID: X-Original-Return-Path: Received: from nm19.bullet.mail.ne1.yahoo.com ([98.138.90.82] verified) by logan.com (CommuniGate Pro SMTP 6.0c1) with SMTP id 5746702 for lml@lancaironline.net; Thu, 06 Sep 2012 00:53:41 -0400 Received-SPF: none receiver=logan.com; client-ip=98.138.90.82; envelope-from=chris_zavatson@yahoo.com Received: from [98.138.90.52] by nm19.bullet.mail.ne1.yahoo.com with NNFMP; 06 Sep 2012 04:53:06 -0000 Received: from [98.138.226.165] by tm5.bullet.mail.ne1.yahoo.com with NNFMP; 06 Sep 2012 04:53:06 -0000 Received: from [127.0.0.1] by omp1066.mail.ne1.yahoo.com with NNFMP; 06 Sep 2012 04:53:06 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 6745.6892.bm@omp1066.mail.ne1.yahoo.com Received: (qmail 139 invoked by uid 60001); 6 Sep 2012 04:53:05 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:Message-ID:Date:From:Reply-To:Subject:To:Cc:MIME-Version:Content-Type; b=TJJXZlfIkb7X1CSsHJimIxFOuByIBPNgXWCx5SoFXJ89pi5N2QwCLgKpBo9g77rJqKyr7oDySVZIxQcuX8InFPx3Fc6cGS5c3oH0AgHKmqHAa5Jp9tiDh5/3d1DARPbBWNCGDE7wkHaZHP4K59vWGKGTMkfEeaaoyLjUbdnk0io=; X-YMail-OSG: Z6CtwEcVM1mZxsowTKrljYReKGjM_yc4LMCKK8NUW9XYZpD HsAi9Sr8WrWLT2SlFAlbROcTztsPjAvMsn7ybx3R3EMGo.MQ_aaglgjJU3aW Hr.0zMCSP3dLamxl0Zv.9zrIR7GqhyKR.LB0w2o_i1FAQaP7jSyQQqQcPsg7 uj.WzxUNsswdUMyfOzTJLwuISSb8VwzsYdKHzWpxWVnW9gdLJsH0d1GFFe9b CMAHajvm7DYE7wqui7qbqnnxbxMNKTvjOFAeH1K.ZF9zZXqDLWKO0E4ijkxy CZeIGHbrK8JKBTWYFq_n6fZ8dfv.AXY_w3yDx8gABgArkJWe49qONe43rei6 rUKpIe0LpEsScC.rM7taf8XBuRGYGAc90Zz2xIBPp7necynqp4LJf6HJGbsN Jb1Zv9FUipPOgy4q3P2UoP6cGvWnC5Zt7sjfZwCYO.MQUuePk303Hj0pnEpm dDzRZsgfqSINVQ8uAGwdceE3vrYQvC54v3SP4Wo.E_rObxHsSsoaMkkKYcam Trj0GHMQFEkRRELjDWGJd Received: from [76.246.61.55] by web121603.mail.ne1.yahoo.com via HTTP; Wed, 05 Sep 2012 21:53:05 PDT X-Mailer: YahooMailWebService/0.8.121.416 X-Original-Message-ID: <1346907185.96636.YahooMailNeo@web121603.mail.ne1.yahoo.com> X-Original-Date: Wed, 5 Sep 2012 21:53:05 -0700 (PDT) From: Chris Zavatson Reply-To: Chris Zavatson Subject: Adjustable Thermal Relief Valve X-Original-To: Lancair Mailing List X-Original-Cc: Fred Moreno , "n233ee@gmail.com" MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-1682663710-148912604-1346907185=:96636" ---1682663710-148912604-1346907185=:96636 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable I couldn't help myself.=A0 After thinking about the discussion regarding th= ermal expansion of the hydraulic fluid, I went out to the hangar and opened= up the Oildyne pump=A0I use on=A0the test stand.=A0 I removed the high sid= e thermal relief valve and added a check nut, much like is found on the pre= ssure relief valves.=A0 Full engagement of the thermal relief valve spring = is very close to=A0two full revolutions of the assembly.=A0 I backed this o= ff one half turn and tightened the check nut.=0AAfter=A0everything was put = back together, I powered up the system and started heating the fluid.=A0=A0= When=A0system pressure=A0reached about 1800 psi, the thermal relief valve (= TRV) cracked.=A0=A0Pressure bled down about 100 psi.=A0 With continued heat= ing, the cycle continued -pressure cycling between 1,700 and 1,800 psi.=A0= =0AThis looks like a simple way to bring the maximum obtainable system pres= sure down to a more reasonable level relative to our normal operating press= ures.=0AWrite-up and video to follow.=0A=A0=0AChris Zavatson=0AN91CZ=0A360s= td=0Awww.N91CZ.net ---1682663710-148912604-1346907185=:96636 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable

I cou= ldn't help myself. After thinking about the discussion regarding ther= mal expansion of the hydraulic fluid, I went out to the hangar and opened u= p the Oildyne pump I use on&= nbsp;the test stand. I removed the 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 t= wo full revolutions of the assembly. I backed this off one half turn = and tightened the check nut.

After everything was put back together, I p= owered up the system and started heating the fluid. When sy= stem pressure reached about 1800 psi, the thermal relief valve (TRV) cracked. Pressure bled = down about 100 psi. With continued heating, the cycle continued -pressure cyclin= g between 1,700 and 1,800 psi.

This looks like a simple way to bring the maximu= m obtainable system pressure down to a more reasonable level relative to ou= r normal operating pressures.

Write-up and video to follow.

Chris Zavatson

N91CZ

360std

www.N91CZ.net

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