Pneumatic actuators is how to work?

Pneumatic actuators is how to work? When the compressed air from A tube tip into the pneumatic actuator, gas drive double piston to both ends ( Cylinder head side) Linear motion, the piston rack drive axis lying on the function of gear counterclockwise rotation C, the valve is open. At this point at the ends of the pneumatic valve with B officer tip discharge gas. Conversely, when the compressed air from B officer tip into the pneumatic button into profit both ends of the line of gas drive double plug to the middle line movement, the rack on the piston driven gear rotate clockwise rotation axis lying to C, the valve is closed. The pneumatic actuator with A pipe in the middle of the gas nozzle. The above for standard transmission principle. Pneumatic actuators can be device according to user requirements, in contrast to the standard transmission principle, namely choose standard shaft rotate clockwise to open valve, counterclockwise rotation to close the valve. The single function ( Spring return type) Pneumatic actuator tube tip for air inlet, A tube to vent (B B pipe nozzle should be installed muffler) 。 When A pipe nozzle inlet to open valve, expired on close valve spring force.