A mechanical activation system including a first mechanical device mechanically connectable to and controllable by an external device, with a rotational orientation of the first mechanical device controllable by the external device, the rotational orientation representative of a parameter of the external device. The first mechanical device and second mechanical device having interacting surfaces for controlling a valve for preventing the parameter of the external device from reaching a critical value. An operator actuation device interacts with a surface of the first mechanical device, permitting a single operator input that is automatically resettable by the system.