KITZ's highly reliable B-series pneumatic spring return actuators and cast steel ball valves are available in a wide range of sizes.
B-series actuators can be used to meet a wide variety of industrial actuator needs.

At the moment the air is discharged to the atmosphere through the solenoid valve, the spring force pushes the piston to the reverse direction, and the scotch-yoke activates clockwise rotation of the shaft to reversely operate the valve. Air failure will cause the valve return to the original open or closed position automatically, following the preset mode, unlike the valve driven by Type B actuator. The BSW actuator is driven with the same mechanism as Type BS, but provided with a handwheel for manual operation. Please beaar it in mind that the handwheel must be factory mounted.

The air pressure supplied into the cylinder pushes the piston out ward and energizes its movement to rotate the scotch-yoke counter-clockwise, compressing the spring. The scotch-yoke converts linear movement of the piston rod to counter-clockwise rotational movement of the drive shaft by 90 , to open or close the valve, following the preset mode.