(57) An actuator (14) for use in an engine protection or shutdown system, connectable
to a source of fluid under pressure (12), which has a body (170) defining a chamber
(172), an inlet port (29) and a vent port (224), and a cup-shaped piston (188) and
rolling diaphragm (194) connected to a rod which is electrically actuated by a solenoid
valve (240) to selectively move the rod from a first to a second position, to selectively
connect the source of fluid to the vent port or the inlet port thus causing a shift
between a shutdown and a run position. The invention extends to a shutdown system
for an internal combustion engine including such an actuator in which the source of
pressurized fluid may also include fluid control means (102) and pressure regulating
valve means (296).
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