Even if the shape of the thread part is bad, even using Loctite leaked grandly.
The leaks ceased when I repaired the tap and coped.
I confirmed the standard, but since Rc is PT, it should be no problem. Is it NPT?
Whether the hit of the seat of the needle valve is bad afterwards, the handle is heavy as several rotations before touching.
If the perimeter is solid, the handle will stop steadily.
Although there was no leakage of the needle part, it is usable, but the operability is considerably bad.