System Selection Guides

The automatic electric overspeed protection shutdown system is designed to continuously monitor diesel engine RPM to immediately shutdown the engine in the event of an overspeed condition. The Speed Switch monitors engine RPM through either a flywheel mounted magnetic pickup or an AC lead from the engine alternator. The Speed Switch will immediately activate the Air Intake Shutoff Valve. The system also includes a Manual Override Toggle Switch that can be used to trigger a manual emergency closure of the Air Intake Shutoff Valve.

The automatic electric to pneumatic overspeed detection shutdown system is designed to continuously monitor diesel engine RPM to immediately shutdown the engine in the event of an overspeed condition. The Speed Switch monitors engine RPM through either a flywheel mounted magnetic pickup or an AC lead from the engine alternator. The Speed Switch will immediately activate the pneumatic solenoid when the engine RPM exceeds a preset limit, which triggers the shutdown of the Air Intake Shutoff Valve. The system also includes a manual override toggle switch that can be used to trigger a manual emergency closure of the Air Intake Shutoff Valve.

The automatic hydro-mechanical failsafe overspeed detection shutdown system uses an Overspeed Sensing Valve to monitor engine RPM to immediately shutdown the engine in the event of an overspeed condition. This system is designed to be used when electrical power is not available or is not desired for the application. The Failsafe Air Intake Shutoff Valve is held open by the air or oil pressure in the control system. The AMOT 4110 Overspeed Sensing Valve monitors engine RPM through the engine tachometer drive that immediately vents the pneumatic or oil pressure control signal when the engine RPM exceeds a preset limit. When the control system is vented, the loss of pressure triggers the Failsafe Air Intake Shutoff Valve to close.

The automatic self-contained overspeed shutdown system is a flow actuated valve requiring no external electrical or mechanical input devices. The closing force on the valve is provided by the intake air flow passing through the valve. The valve closes automatically when the engine speed exceeds a pre-set point. The valve automatically resets open soon after the engine has stopped, so engine is ready for re-starting.

There are 5 basic types of manually actuated overspeed protection systems available:

Manual Pneumatic Shutdown System
The pneumatic manual shutdown system uses the pneumatic manual toggle valve to pressurize the air intake shutoff valve to close.

Local or Cable Operated Shutdown System
The cable operated system uses a pull cable with T-handle to manually close the air intake shutoff valve.