Profile: Helical Technology Ltd. specializes in the design & manufacture of actuators for turbochargers and valve rotators for large diesel & gas engines. Springs for the actuators & valve rotators are also designed and manufactured in-house. Rotators are used on large diesel and gas engines. Each time a valve closes, the valve rotator turns the valve slightly, and allows the inlet & exhaust valves to be heated and cooled symmetrically. It also prevents valves sticking due to uneven carbon build-up, or wear on the valve seat.