Solenoid Valve
A look at what is currently available on eBay
 Asco Red-Hat Valve 8223G21, No Solenoid, NO RESERVE! US $4.99 
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 CDK Solenoid valve LLO-04-25NO US $39.99
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 2 Position 5 Way Air Solenoid Valve 4V310-10 DC 24V US $20.84
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 Aluminum 9 Row Stations Manifold Solenoid Air Pilot Valve Base US $24.63
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 Single Head 2 Position 3 Way Pneumatic Control Air Solenoid Valve US $13.32
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 SOLENOID VALVE US $99.00
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How does a solenoid valve work?
Hi everybody,
I need some information about the operation of a double solenoid valve and how to control it using a PLC
A double solenoid has two solenoids, and when voltage is supplied to one (and not the other) the valve shifts. Note that if voltage is supplied to both solenoids at the same time, the valve will stay in the position is was in (i.e. it won't shift since the solenoids will be working against each other). This is typically not desired, so make sure you remove voltage from one side when supplying it to the other.
If no voltage is supplied to either solenoid, the result will be the same as if voltage is supplied to both, in that the valve will stay in the position is was in.
What this means is that the cylinder has no home position, so when power is cut, the valve will stay where it was at that time, and the cylinder will continue to do work in the direction is was working in. Again, depending upon what the cylinder was doing, this may or may not be desired.
For Conrolling with PLC you may need to wire two discrete outputs of PLC to those two solenoids using relay. And the ON/OFF those two outputs as required.
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October 26th, 2007 in
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