FX Fx dream line valve seat won’t seal

I've heard you can grind it out with valve grinding compound, but I didn't have much luck with it.

This is in the manual:
• Never fire the rifle when it is empty of air or when air cylinder is removed!

It's in there with the rest of the warnings that make so much sense that you (I) skip over them. "Don't shoot at other human beings!" "Do not taunt Happy Fun Ball!" But that one counts; you can mess up your Dreamline that way.
 
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I would go ahead and order at least 1 poppet plus a spare, as well as 2 valve seats.
UTAH AIR most likely has them in stock
Buying multiples not only gives you a spare but also defrays some of the shipping costs

Also, you can find the proper part #'s on the Dreamline Parts list at the FX website

Hope this is helpful

just my 2 spares
Edward


 
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Still not sealed the valve seat it was stuck solid when I removed the old one the new one is easy to fit in and take out should it be harder to take out if fitted properly should I need to give the seat a light tap in with a punch for it to seal properly or should picking down on it with the valve stem be enough for it to fit snug
Not sure about tapping on it. Did you try to fill off a tank or compressor? New valve and seat may require a quick blast of hp air from a tank initially to seat.
 
My Boss had that issue, but I dont know if the Dream is the same:

If you can see the area where the hammer strikes the poppet you should see about 1/4 inch of post. If not then the valve guide is peened and preventing the poppet from seating.

Dry firing can cause that.
EXACTLY ... look threw small hole passing side to side threw lower receiver. You SHOULD SEE the poppet stem protruding from the air tank side & see face of hammer from the rear of receiver.
No stem showing ? Yup a peened poppet stem or a burr created on the bushing poppet stem slides within.
 
The seat should just push into place with a firm but gentle push with a blunt (not metal) object that is larger than the seat's ID
Make sure you have not put the seat in backwards.
The O-Ring side of the seat goes in first
Here is a good picture of the proper orientation

Hope this helps
Edward