The working principle of the manual pneumatic ball valve

a, open the process in the closed position, the sphere of pneumatic valve stem [ wiki] Mechanical [ / wiki] Pressure effect, press on the pneumatic valve seat.
when counterclockwise rotation handwheel, pneumatic valve stem is reverse movement, the Angle at the bottom of the plane made a sphere release pneumatic valve seat.
pneumatic valve stem continue to ascend, and pneumatic valve rod guide pin of interaction in the spiral groove, the sphere began to rotate without some friction.
until to the fully open position, pneumatic valve stem ascending to limit position, sphere rotation to the full open position.

2, closing process is closed, the handwheel clockwise, pneumatic stem began to drop and the ball left pneumatic seat begin to spin.
to rotate handwheel, pneumatic valve stem is embedded in the spiral groove on the role of the guide pin, pneumatic stem and ball ° rotating at the same time.
almost closed, sphere has been in contact with the pneumatic valve seat without rotating under the condition of the °.
the hand wheel rotation of the last few laps, pneumatic valve stem mechanically wedge Angle at the bottom of the plane to the oppression of a sphere, make its strong pressure on the pneumatic valve seat, completely sealed.