HP series - Direct gas / hydraulic actuator with ductile iron housing and carbon steel cylinders
Spring return and double acting actuators
Quarter-turn output torques to 27,000 Nm / 240,000 lb. in.

The partial stroke test device (PSTD) feature of Biffi Morin actuators allows the mechanical testing of emergency shutdown (ESD) and other critical valves without a shutdown. This animation shows the movements of the actuator during the procedure.