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Subject: RE: [LML] 235/320/360 gear dump valve idea
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Thread-Topic: [LML] 235/320/360 gear dump valve idea
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From: "McCune, Duane" <DMccune@csuchico.edu>
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=20


________________________________

	From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of =
LHenney
	Sent: Tuesday, February 12, 2008 4:45 AM
	To: lml@lancaironline.net
	Subject: [LML] 235/320/360 gear dump valve idea
=09
=09

	Randy,

	=20

	I'm not getting this concern.  The dump line goes to the tank and ends =
submerged in fluid with a =BC" down tube in the reservoir.  =
Additionally, in my opinion no fluid would ever travel upstream toward =
the valve.  Thus, no air would be added to the system by use of a 3 way =
vavle.

	=20

	Larry

	=20

=09
________________________________


	From: randy snarr [mailto:randylsnarr@yahoo.com]=20
	Sent: Sunday, February 10, 2008 9:59 PM
	To: lml@lancaironline.net
	Subject: Re: [LML] Re: 235/320/360 gear dump valve idea

	=20

	Chris,
	Is there such a thing as a check valve that could be incorporated into =
the 3rd pressure dump line to the hyd reservoir?
	That way you could open the dump valve releasing positive pressure from =
the high/low sides of the system but you would not be allowing air from =
that same line if the was no positive pressure or negative pressure?
	Could a shuttle valve help do that?
=09
	Randy Snarr
=09
	Chris Zavatson <chris_zavatson@yahoo.com> wrote:

	<<From: Randy <randystuart

	Then the pump pressurizes the high side and it stops, and the shuttle =
valve centers,...>>

	This is where pumps in the fleet differ.  In my two pumps the shuttle =
valve does not return to center.  It stays where the fluid last pushed =
it.  The O-ring on the spool offers up much more friction than the =
spring on the poppet valve could ever hope to overcome.  I am curious if =
all pump vintages have O-rings on the spool valve and/or how snug the =
fit might be?  If the spool can be made to stay put, the problem goes =
away.  I am simply suggesting this as something to investigate before a =
lot of new plumbing is added to the system.

	=20

	A little over a year ago, when this issue was last discussed, I took a =
series of photos showing the effect of heating and cooling.  What is =
observed is that the high side pressure goes up and down with =
temperature (heat gun and ice bath) while the low side remains at zero.  =


	http://www.n91cz.com/Hydraulics/Heat_Cool_Series.doc=20

	My pumps are '95 and newer.

	=20

	Chris Zavatson

	N91CZ

	360std

	www.N91CZ.com <http://www.n91cz.com/>=20

	=20

=09
________________________________


	Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try =
it now. =
<http://us.rd.yahoo.com/evt=3D51733/*http:/mobile.yahoo.com/;_ylt=3DAhu06=
i62sR8HDtDypao8Wcj9tAcJ%20>=20

	=20

	 =20

=09
________________________________


	Looking for last minute shopping deals? Find them fast with Yahoo! =
Search. =
<http://us.rd.yahoo.com/evt=3D51734/*http:/tools.search.yahoo.com/newsear=
ch/category.php?category=3Dshopping>=20


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<BODY lang=3DEN-US vLink=3Dblue link=3Dblue>
<DIV dir=3Dltr align=3Dleft>&nbsp;</DIV><BR>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
  <DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
  <HR tabIndex=3D-1>
  <FONT face=3DTahoma size=3D2><B>From:</B> Lancair Mailing List=20
  [mailto:lml@lancaironline.net] <B>On Behalf Of =
</B>LHenney<BR><B>Sent:</B>=20
  Tuesday, February 12, 2008 4:45 AM<BR><B>To:</B>=20
  lml@lancaironline.net<BR><B>Subject:</B> [LML] 235/320/360 gear dump =
valve=20
  idea<BR></FONT><BR></DIV>
  <DIV></DIV>
  <DIV class=3DSection1>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dblue size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt; COLOR: blue; FONT-FAMILY: =
Arial">Randy,<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dblue size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt; COLOR: blue; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dblue size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt; COLOR: blue; FONT-FAMILY: Arial">I=92m not =
getting this=20
  concern.&nbsp; The dump line goes to the tank and ends submerged in =
fluid with=20
  a =BC=94 down tube in the reservoir.&nbsp; Additionally, in my opinion =
no fluid=20
  would ever travel upstream toward the valve.&nbsp; Thus, no air would =
be added=20
  to the system by use of a 3 way vavle.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dblue size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt; COLOR: blue; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dblue size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt; COLOR: blue; FONT-FAMILY: =
Arial">Larry<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dblue size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt; COLOR: blue; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <DIV>
  <DIV class=3DMsoNormal style=3D"TEXT-ALIGN: center" =
align=3Dcenter><FONT=20
  face=3D"Times New Roman" size=3D3><SPAN style=3D"FONT-SIZE: 12pt">
  <HR tabIndex=3D-1 align=3Dcenter width=3D"100%" SIZE=3D2>
  </SPAN></FONT></DIV>
  <P class=3DMsoNormal><B><FONT face=3DTahoma size=3D2><SPAN=20
  style=3D"FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: =
Tahoma">From:</SPAN></FONT></B><FONT=20
  face=3DTahoma size=3D2><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Tahoma"> randy=20
  snarr [mailto:randylsnarr@yahoo.com] <BR><B><SPAN=20
  style=3D"FONT-WEIGHT: bold">Sent:</SPAN></B> Sunday, February 10, 2008 =
9:59=20
  PM<BR><B><SPAN style=3D"FONT-WEIGHT: bold">To:</SPAN></B>=20
  lml@lancaironline.net<BR><B><SPAN=20
  style=3D"FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [LML] Re: =
235/320/360 gear=20
  dump valve idea</SPAN></FONT><o:p></o:p></P></DIV>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt">Chris,<BR>Is there such a thing as a check =
valve that=20
  could be incorporated into the 3rd pressure dump line to the hyd=20
  reservoir?<BR>That way you could open the dump valve releasing =
positive=20
  pressure from the high/low sides of the system but you would not be =
allowing=20
  air from that same line if the was no positive pressure or negative=20
  pressure?<BR>Could a shuttle valve help do that?<BR><BR>Randy=20
  Snarr<BR><BR><B><I><SPAN style=3D"FONT-WEIGHT: bold; FONT-STYLE: =
italic">Chris=20
  Zavatson &lt;chris_zavatson@yahoo.com&gt;</SPAN></I></B>=20
  wrote:<o:p></o:p></SPAN></FONT></P>
  <DIV>
  <DIV>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt">&lt;&lt;From: Randy=20
  &lt;randystuart<o:p></o:p></SPAN></FONT></P></DIV>
  <DIV>
  <P class=3DMsoNormal><EM><B><I><FONT face=3D"Arial Narrow" =
size=3D4><SPAN=20
  style=3D"FONT-WEIGHT: bold; FONT-SIZE: 13.5pt; FONT-FAMILY: 'Arial =
Narrow'">Then=20
  the pump pressurizes the high side and it stops, and the shuttle valve =

  centers,...&gt;&gt;</SPAN></FONT></I></B></EM><o:p></o:p></P></DIV>
  <DIV>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt">This is where pumps in the fleet =
differ.&nbsp; In my=20
  two pumps the shuttle valve does not return to center.&nbsp; It stays =
where=20
  the fluid last pushed it.&nbsp; The O-ring on the spool offers up much =
more=20
  friction than the spring on the poppet valve could ever hope to=20
  overcome.&nbsp; I am curious if all pump vintages have O-rings on the =
spool=20
  valve and/or how snug the fit might be?&nbsp; If the spool can be made =

  to&nbsp;stay put, the problem goes away.&nbsp; I am simply suggesting =
this as=20
  something to investigate before a&nbsp;lot of new plumbing is added to =
the=20
  system.<o:p></o:p></SPAN></FONT></P></DIV>
  <DIV>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt">&nbsp;<o:p></o:p></SPAN></FONT></P></DIV>
  <DIV>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt">A little over a year ago, when this issue =
was last=20
  discussed, I took a series of photos showing the effect of heating and =

  cooling.&nbsp; What is observed is that the high side pressure goes up =
and=20
  down with temperature (heat gun and ice bath) while the low side=20
  remains&nbsp;at zero.&nbsp; <o:p></o:p></SPAN></FONT></P></DIV>
  <DIV>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt"><A=20
  =
href=3D"http://www.n91cz.com/Hydraulics/Heat_Cool_Series.doc">http://www.=
n91cz.com/Hydraulics/Heat_Cool_Series.doc</A>&nbsp;<o:p></o:p></SPAN></FO=
NT></P></DIV>
  <DIV>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt">My pumps are '95 and=20
  newer.<o:p></o:p></SPAN></FONT></P></DIV>
  <DIV>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt">&nbsp;<o:p></o:p></SPAN></FONT></P></DIV>
  <DIV>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt">Chris =
Zavatson<o:p></o:p></SPAN></FONT></P></DIV>
  <DIV>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt">N91CZ<o:p></o:p></SPAN></FONT></P></DIV>
  <DIV>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt">360std<o:p></o:p></SPAN></FONT></P></DIV>
  <DIV>
  <P class=3DMsoNormal style=3D"MARGIN-BOTTOM: 12pt"><FONT face=3D"Times =
New Roman"=20
  size=3D3><SPAN style=3D"FONT-SIZE: 12pt"><A=20
  =
href=3D"http://www.n91cz.com/">www.N91CZ.com</A><o:p></o:p></SPAN></FONT>=
</P></DIV></DIV>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <DIV class=3DMsoNormal style=3D"TEXT-ALIGN: center" =
align=3Dcenter><FONT=20
  face=3D"Times New Roman" size=3D3><SPAN style=3D"FONT-SIZE: 12pt">
  <HR align=3Dcenter width=3D"100%" SIZE=3D1>
  </SPAN></FONT></DIV>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt">Be a better friend, newshound, and =
know-it-all with=20
  Yahoo! Mobile. <A=20
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