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Mark Dionne
Works at CalorieMinder.com
Attended Michigan State University
Lives in Newton, MA
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Mark Dionne

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The symbols we use every day have fascinating and surprisingly recent origins, explains author Joseph Mazur in his new book
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Mark Dionne

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Mark Dionne

commented on a video on YouTube.
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The video is great, but it leaves out one important thing: the second solenoid, which was not shown and sits under the electric terminals, routes a small amount of pressurized gas to the bottom of the big diaphragm which effectively operates the main outlet valve (and also regulates the pressure). Gas pressure is used as the operating force for the main valve. This is important on "millivolt" versions of this valve, where a bigger 700 millivolt thermopile provides all the electricity to operate both solenoids. The thermopile would have to be very large to provide enough power to operate the main gas valve all by itself.

190055joe asked how 20 mv can operate the solenoid. The voltage does not "pull in" the solenoid, it just holds the solenoid in its fully-in position. That takes less current/voltage. The solenoid is "pulled in" when the Pilot button is pressed in by the person lighting the pilot.
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Actually I did mention that it is pilot operated.  I did not explain the operation of that part of the valve because this video is more about how the pilot safety works than how the gas is used to open the valve.  Perhaps I should do one on how a pilot valve works.  Thanks for the thoughts.  
GFM
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As Einstein once said, any two variables should correlate as highly as possible, but no more so
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Mark Dionne

commented on a video on YouTube.
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Toward the end: Al and Doria Dupere (my dad's second cousins), Al's wife Rita and Rita's mother Hannah Duquette Buote.
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commented on a video on YouTube.
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Looks like a rat at 2:02. :-)
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People
In his circles
141 people
Have him in circles
101 people
bruce macdonald's profile photo
Dj haste's profile photo
David Coletta's profile photo
Madalin Stanciu's profile photo
Frank Paynter's profile photo
John Ruttenberg's profile photo
Berry Davenport's profile photo
Jon Waldron's profile photo
Greg Parsons's profile photo
Work
Occupation
Software developer
Employment
  • CalorieMinder.com
    Founder, 2007 - present
  • Kayak.com
    Software Architect, 2009 - 2010
  • Kurzweil Educational Systems
    VP Engineering, 1996 - 2006
  • Interleaf, Inc
    Director Engineering, 1983 - 1996
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Currently
Newton, MA
Previously
Westwood, MA - East Lansing, Michigan - Vancouver, British Columbia
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I like to take things apart.
Education
  • Michigan State University
  • University of British Columbia
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Male
They never shovel snow from the sidewalk in front of their building, forcing people to walk in Route 9 traffic. I'm sure this does not bother their customers in their Maseratis, but it's a kick in the face to the other 99%. (They will tell you, like they told me, that it is the responsibility of the landlord. Well they need to twist the landlord's arm or do it themselves.)
Public - 2 months ago
reviewed 2 months ago
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