<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Keith Bradshaw,<br>
<br>
I am about to install a Magnatrol 24V direct acting cryogenic fill
valve on our fill station. We will preserve our manual shutoff valve
and add a 1-hour spring wound timer for fills. We've found fills times
for our 160 L cylinders takes about an hour given our bulk tank
pressure of 40 psi and expect it to take longer, in the future, when we
raise this 3000 gallon tank from 40 to 80 psi (i.e. a larger "flash
loss").<br>
<br>
It is interesting to read about your experience. I have no experience
with electronic direct acting cryogenic valves and bulk fills. I did
consider a pilot-operated valve using the tanks N2 pressure as the
motive force but I went for the simpler direct acting route using an
electromagnetic valve. <br>
<br>
Choosing 24V AC means I can run a cable to the fill station and avoid a
110V hazard. <br>
<br>
I'm not looking for any surprises so your warning is appreciated!<br>
<br>
Bob Hamilton<br>
<br>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<meta name="ProgId" content="Word.Document">
<meta name="Generator" content="Microsoft Word 11">
<meta name="Originator" content="Microsoft Word 11">
<link rel="File-List"
href="file:///C:%5CDOCUME%7E1%5Cbob%5CLOCALS%7E1%5CTemp%5Cmsohtml1%5C01%5Cclip_filelist.xml">
<o:smarttagtype
namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"></o:smarttagtype><o:smarttagtype
namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="PlaceType"></o:smarttagtype><o:smarttagtype
namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="PlaceName"></o:smarttagtype><o:smarttagtype
namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="City"></o:smarttagtype><o:smarttagtype
namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="State"></o:smarttagtype><o:smarttagtype
namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="PostalCode"></o:smarttagtype><!--[if gte mso 9]><xml>
<w:WordDocument>
<w:View>Normal</w:View>
<w:Zoom>0</w:Zoom>
<w:PunctuationKerning/>
<w:ValidateAgainstSchemas/>
<w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid>
<w:IgnoreMixedContent>false</w:IgnoreMixedContent>
<w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText>
<w:Compatibility>
<w:BreakWrappedTables/>
<w:SnapToGridInCell/>
<w:WrapTextWithPunct/>
<w:UseAsianBreakRules/>
<w:DontGrowAutofit/>
</w:Compatibility>
<w:DoNotOptimizeForBrowser/>
</w:WordDocument>
</xml><![endif]--><!--[if gte mso 9]><xml>
<w:LatentStyles DefLockedState="false" LatentStyleCount="156">
</w:LatentStyles>
</xml><![endif]--><!--[if !mso]><object
classid="clsid:38481807-CA0E-42D2-BF39-B33AF135CC4D" id=ieooui></object>
<style>
st1\:*{behavior:url(#ieooui) }
</style>
<![endif]-->
<style>
<!--
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{mso-style-parent:"";
margin:0in;
margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:12.0pt;
font-family:"Times New Roman";
mso-fareast-font-family:"Times New Roman";}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;
text-underline:single;}
a:visited, span.MsoHyperlinkFollowed
{color:purple;
text-decoration:underline;
text-underline:single;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.25in 1.0in 1.25in;
mso-header-margin:.5in;
mso-footer-margin:.5in;
mso-paper-source:0;}
div.Section1
{page:Section1;}
-->
</style><!--[if gte mso 10]>
<style>
/* Style Definitions */
table.MsoNormalTable
{mso-style-name:"Table Normal";
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-parent:"";
mso-padding-alt:0in 5.4pt 0in 5.4pt;
mso-para-margin:0in;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.0pt;
font-family:"Times New Roman";
mso-ansi-language:#0400;
mso-fareast-language:#0400;
mso-bidi-language:#0400;}
</style>
<![endif]-->
<p class="MsoNormal"><span style="font-family: Arial;">Robert Hamilton<o:p></o:p></span></p>
<p class="MsoNormal"><st1:placetype w:st="on"><span
style="font-family: Arial;">University</span></st1:placetype><span
style="font-family: Arial;"> of <st1:placename w:st="on">California</st1:placename>
at <st1:city w:st="on"><st1:place w:st="on">Berkeley</st1:place></st1:city><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: Arial;">Microlab
Facilities Manager<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: Arial;">Rm406 Cory Hall<o:p></o:p></span></p>
<p class="MsoNormal"><st1:place w:st="on"><st1:city w:st="on"><span
style="font-family: Arial;">Berkeley</span></st1:city><span
style="font-family: Arial;">, <st1:state w:st="on">CA</st1:state> <st1:postalcode
w:st="on">94720-1770</st1:postalcode></span></st1:place><span
style="font-family: Arial;"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: Arial;">510-642-2716<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: Arial;">510-642-2916
(Fax)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: Arial;">510-325-7557
(Cell)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: Arial;"><a
href="mailto:bob@silicon2.eecs.berkeley.edu">bob@silicon2.eecs.berkeley.edu</a><o:p></o:p></span></p>
<br>
<br>
On 3/25/2010 12:43 PM, Keith Bradshaw wrote:
<blockquote
cite="mid:40190E926F94485B93FE27DCC0304407@campus.ad.utdallas.edu"
type="cite">
<meta http-equiv="Content-Type"
content="text/html; charset=ISO-8859-1">
<meta name="Generator" content="Microsoft Word 11 (filtered medium)">
<o:smarttagtype
namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="PlaceName">
<o:smarttagtype
namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="PlaceType"><o:smarttagtype
namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="City">
<o:smarttagtype
namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"><!--[if !mso]>
<style>
st1\:*{behavior:url(#default#ieooui) }
</style>
<![endif]-->
<style>
<!--
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{color:purple;
text-decoration:underline;}
p.MsoAutoSig, li.MsoAutoSig, div.MsoAutoSig
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:Arial;
color:windowtext;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.25in 1.0in 1.25in;}
div.Section1
{page:Section1;}
-->
</style>
<div class="Section1">
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;">We had a LN2 electric
valve stick during filling and are
looking for a better system.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;">What do you use for
filling the big LN2 dewars? We are
filling from a 3,000 gallon tank.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;">Cordially,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;">Keith Bradshaw<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoAutoSig"><font size="3" face="Times New Roman"><span
style="font-size: 12pt;">Keith Bradshaw<o:p></o:p></span></font></p>
<p class="MsoAutoSig"><font size="3" face="Times New Roman"><span
style="font-size: 12pt;">972-883-2099<o:p></o:p></span></font></p>
<p class="MsoAutoSig"><font size="3" face="Times New Roman"><span
style="font-size: 12pt;">RL 10<o:p></o:p></span></font></p>
<p class="MsoAutoSig"><st1:placetype w:st="on"><font size="3"
face="Times New Roman"><span style="font-size: 12pt;">University</span></font></st1:placetype>
of <st1:placename w:st="on">Texas</st1:placename> at <st1:city
w:st="on"><st1:place w:st="on">Dallas</st1:place></st1:city>
Clean Room<o:p></o:p></p>
<p class="MsoAutoSig"><font size="3" face="Times New Roman"><span
style="font-size: 12pt;">NSERL building<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span
style="font-size: 12pt;"><o:p> </o:p></span></font></p>
</div>
<pre wrap="">
<fieldset class="mimeAttachmentHeader"></fieldset>
_______________________________________________
labnetwork mailing list
<a class="moz-txt-link-abbreviated" href="mailto:labnetwork@mtl.mit.edu">labnetwork@mtl.mit.edu</a>
<a class="moz-txt-link-freetext" href="https://www-mtl.mit.edu/mailman/listinfo.cgi/labnetwork">https://www-mtl.mit.edu/mailman/listinfo.cgi/labnetwork</a>
</pre>
</o:smarttagtype></o:smarttagtype></o:smarttagtype></o:smarttagtype></blockquote>
</body>
</html>