Yes, you can twist it with air in it, it could be a little tight but it won’t hurt it. there is something very small stuck between the valve and the seat.
If firing and twisting does not help it must be taken apart and cleaned as I said before, it is not hard to do.
Have u Tryed dryfirinh it a few time? IV had that problem and I snakes mine with a rubber mallet and that fixed mine. Try that worst case drain the tank and pull it apart and clean well.
1. Empty the tank.
2. Remove brass valve insert, right under top hat.
3. put polishing compound on delrin valve and seat.
4. Push together and spin to polish seat.
5. Clean up and reinstall.
Ok I twisted the top hat and IT WORKED!!!! Thanks everyone for ur help!!