What happens to the actuator if the filter regulator gets broken during the actuator stroke?
In case of filter regulator loss and output pressure from the compressor above the minimum one during the air stroke, the actuator will continue the travel with no excess of torque produced. Any eventual pressure above the minimum one will be applied on the mechanical end stopper at the end of the stroke. For most of our pneumatic actuators, such stopper is however designed to withstand a maximum supply pressure of 12 bar - see definition of MAWP above.
If, on top of the above conditions of filter malfunctioning and increased air pressure supply up to the MOP value, the valve gets stuck during the travel, the actuator output torque generated by the cylinder may exceed (depending on the inlet pressure supplied) the MAST of the actuator and of the valve as well.
Technically, if the actuator is selected considering both minimum and maximum supply pressure (by selecting the option 'Actuator MAST mandatory' in the sizing sheet) the actuator MAST issue disappears, but the output model is oversized in most of the cases with a non negligible commercial impact and probably issues on the valve MAST. A possible proposal to remove or at least reduce the extent of the oversizing is the introduction of a relief valve limiting the real maximum pressure far below the one available from the compressor.