Pure water machine copper ball pneumatic valve is leaking

pure water machine after installing leakage due to improper installation technique, the leaking point of failure in copper ball pneumatic valve pressure barrels.
the following paper analyzes the reasons of leaking:
the first, second in charge of the shear is not standard, the nozzle is incomplete, skew, burr will cause interface leak; The solution is to use special tube cutter shearing second in charge.
the second, and the second in charge of the failed to put in place, leaking; The solution is to find feel, the visual size. Just insert pipe joint mm, will be stop once, then need to insert joint force, will once again into the mm.
the third, pneumatic ball valve installation, lack of sealing ring; Solution is to seal and pneumatic ball valve, sealing ring will leak.
the fourth, pneumatic ball valve and pressure bucket of water nozzle installing tie ribbons; Solution is this step is not allowed to tie ribbons, and tighten the pneumatic ball valve with the hand, observe the watertight can
the fifth, the installation process pneumatic ball valve and pressure bucket of water mouth docking skew; Solution is to ensure the installation of two mating parts center line must be on the same lines, and the strength of installation.