Correct.

You do not want a valve that does not close when there is no power to it...if that was what they wanted , they would not have a valve there to begin with. They would have just run a vac line to the canister.

Sorry for being short with you ,but your responces are with a.. "Yeah, BUT...." and you want Specifics...like I was NOT specific ????

I was very specific.
The reason they PULSE the vac from the canister is b/c if the engine just got a big gulp of air from the canister from a wide open purge, it would upset the A/F mixture of the engine, just like a VACUUM LEAK..so , they meter it in small pulses/doses ..that is what the frequency of the pulses are for...and they vary according to the load conditions of the ECU criteria and feedback of the mapping.
The pulses are what you feel in the valve, but just cuz you feel the sol. pulsing the actuating pintle pin DOES NOT mean the valve SEAT is shutting OFF vac when it is not getting a signal...that's all I was trying to tell you and I thought I made that clear.
Ever turn a faucet OFF , but water still leaks out...same deal, except in this case , it can effect the A/F mix to the engine just like you had a vac leak...which you may have.
I just wanted to let you know you had not diagnosed the Purge as OK correctly just cuz you could feel it pulse ..that is only part of the test for purge [ as my very first post states] You must then check flow OPEN/CLOSED. Regardless of the pulsing ....it can be pulsing all day long and not be doing what it is designed to do.[ control/meter vac flow on/off using a predetermined frequency/Htz signal]
The 3 sections to purge system are ECU demand signal to solinoid coil of purge, [ OK/OHMED] actuation of pin by solinoid, [OK/ Feel] and valve seat open/closing for vac flow when pin actuates. [ Not tested] That's it.............you have verified the first two, and now if you verify the flow test, you have eliminated or confirmed the Purge as the cause of your condition and if then verified, I suggest you look elsewhere.

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A Dalton