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Science Forum Index » Mechanics Forum » Solenoid Valve
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| Guest |
 Posted: Tue Mar 25, 2008 11:02 am |
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I'm looking for a 3 way SST diaphragm solenoid valve. I want it to be
direct acting with a 24 VDC coil. I'd also like it to have positive
position feedback that a PLC could interpret. I want to use this
valve to shut off the upstream hydrogen fuel supply and vent the
downstream pressure caused by the supply of resident hydrogen gas.
Anyone have any ideas?
Thanks for your help. |
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| dlzc |
| Posted: Wed Mar 26, 2008 6:44 am |
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Dear dfroe...:
On Mar 25, 2:02 pm, dfroe...@mmm.com wrote:
Quote: I'm looking for a 3 way SST diaphragm solenoid
valve.
Hydrogen embrittles stainless, I believe. Diaphragms use supply
pressure and "controlled leaks" to operate the valve. Diaphragm
valves fail in horrible ways, ways that you would not want to occur in
a fuel cell system, for example.
Quote: I want it to be direct acting with a 24 VDC coil.
Direct acting *diaphragm* solenoid valves do not exist. You might get
a motorized cam to close a diaphragm with still a very high Cv.
Quote: I'd also like it to have positive position feedback
that a PLC could interpret. I want to use this
valve to shut off the upstream hydrogen fuel
supply and vent the downstream pressure
caused by the supply of resident hydrogen gas.
Anyone have any ideas?
Motorized ball valve, 2-way, and let the engine bleed off and oxidize
the last of the fuel, rather than sending that shot to space. If you
have to, use a 3 way and vent it to a catalytic converter. Ball
valves have stems that are easy to monitor for position. Do not get
one with all ports in a plane perpendicular to the actuation axis.
Get one with the common port in line with the axis of acutation. That
way you have a hope of sealing the hydrogen gas.
David A. Smith |
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| Brian Whatcott |
| Posted: Wed Mar 26, 2008 9:09 pm |
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Guest
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On Tue, 25 Mar 2008 14:02:12 -0700 (PDT), dfroell1@mmm.com wrote:
Quote: I'm looking for a 3 way SST diaphragm solenoid valve. I want it to be
direct acting with a 24 VDC coil. I'd also like it to have positive
position feedback that a PLC could interpret. I want to use this
valve to shut off the upstream hydrogen fuel supply and vent the
downstream pressure caused by the supply of resident hydrogen gas.
Anyone have any ideas?
Thanks for your help.
This looks like an ideal application for a supplier's technical
support phone line.
Brian W |
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