Helical spline design 
Compact quarter-turn pneumatic actuators for on-off and modulating control of ball, butterfly, plug or damper style valves in heavy duty service. Generating output torques up to 300,000 Nm, it is the ideal solution where space is limited. 

Product overview
Designed with a unique helical slot design, which transforms the linear movement of a piston into a quarter-turn rotation, generating high break torques to actuate large valves. With its spring integrated into the cylinder, it is very compact with the same dimensions whether for double-acting or spring return; spring to open or spring to close operations.