Tuning Hatsan air tube and valve.

Not new to shooting but new to airgunning so I may as well be new to shooting. Installed a Huma reg. in my brand new Bullboss .22. Began the tuning process. went to unscrew the air tube and it is unscrewing from the valve. In other words i have no other way to degas than to dry fire .Has anyone encountered a similar problem? I don't like to dry fir but that's what Im going to do as long as necessary. I have ordered a new valve and reservoir assembly in case I damage the valve when removing. Thanks for the help.