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Can you tell me in water column what the supply pressure is?
Have you removed valve to check the inlet screen?
the inlet screen is on the entering side where gas pipe attaches...it i to keep pipe dope and oil from entering valve
Actually this valve has had issues. They did not hold up as well as the old units. Many more of these are replaced than the previous version.
The inlet screen inlet cleanable....I do not think that is your issue, but it is a possibilty to check before replacing valve. The reason there is a drip leg or dirt leg on gas appliance piping is because of residue in gas lines...water, oil, pipe dope...that is why there is always a little drip leg before it goes into the appliance.
What is the outlet pressure when calling for heat?
I see, I understood you could light it with a match and it would stay lit. If you have 11" WC in ,pilot tube and orifice is clean, but not getting enough gas out to light pilot, the diaprahm is most likely bad in valve.This is not field repairable. Replace valve.