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 HYDRAMECHANICAL PROTECTIVE SYSTEM
SYSTEMS OPERATION
Air Inlet Shutoff
The air inlet shutoff consists of a shutoff valve in
the engine air inlet housing and a hydraulic actuator that
holds the shutoff valve in the "OPEN" position.
If an engine is operated in a combustible atmo-
sphere, such as an oil or gas blow out on an oil rig, the
air supply must be stopped to give a positive method of
engine shutdown. If only the fuel control linkage was
moved to the "SHUTOFF" position, the engine may
continue to run on the air-oil-gas mixture pulled into the
engine air intake.
SHUTOFF CONTROL GROUP
The hydramechanical protective system closes
3. Shutoff control group. 4. Engine oil pressure
the air inlet shutoff valve to stop combustion air supply to
line. 7. Diverter valve. 9. Oil line to thermostatic
the engine in an overspeed condition, to give a more
pilot valve. 10. Oil line to fuel shutoff actuator.
positive shutdown. The air inlet shutoff valve is also
closed when the emergency manual shutoff is operated.
Since overspeed is a serious occurrence, the air inlet
shutoff must be manually reset. This action requires a
person t6 physically go to the engine and see if any
damage has occurred.
Fuel Shutoff Actuator
This actuator is located on top of the Woodward
UG-8 or the Caterpillar 3161 Governor. The actuator
can be either an electric or hydraulic actuator that is
operated any time the hydramechanical protective
system causes engine shutdown. When operated by the
diverter valve, the actuator moves the governor shutoff
strap which causes the governor to move the engine fuel
AIR INLET SHUTOFF
control linkage to the "SHUTOFF" position.
11. Air inlet shutoff housing. 12. Air inlet shutoff
actuator. 13. Aftercooler housing.
COMPONENT LOCATIONS ON ENGINE
SHUTOFF CONTROL GROUP
1. Oil lines to air inlet shutoff actuator. 2. Rack
sequence valve. 3. Shutoff control group. 4.
AIR INLET SHUTOFF
Engine oil pressure line. 5. Emergency manual
11. Air inlet shutoff housing. 13. Aftercooler
shutoff valve. 6. Cover (oil reservoir). 7. Diverter
housing. 14. Reset knob.
valve. 8. Air inlet sequence valve.
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