Automatic electric/pneumatic air shut off system

The automatic electric to pneumatic air shut off system is designed to continuously monitor diesel engine RPM to immediately shutdown the engine in the event of an overspeed condition.
The RevGuard Speed Switch monitors engine RPM through either a flywheel mounted magnetic pickup or a signal from the Automatic Electric to Pneumatic Overspeed Detection Shutdown System engine alternator. The RevGuard Speed Switch will immediately activate the 3-way pneumatic solenoid when the engine RPM exceeds a preset limit, which pressurizes the Air Intake Shutoff Valve to close.
The system also includes a manual override toggle switch that can be used to manually close the Air Intake Shutoff Valve.


Electric/Pneumatic Air Shutoff System

Butterfly or Swing Gate Air Intake Shutoff Valve

Used to seal off intake air to a diesel engine for emergency shutdowns

  • Sizes range from 1” to 7”
  • Pneumatic version in 90-130 psi (6.2 - 9.0 bar)
  • Available temperature range from -40°F to +550°F (-40°C to 288°C)
  • Position indicator switch available

RevGuard Speed Switch
Monitors engine RPM to shut down a runaway engine at a preset limit
  • Operates on 12 or 24 VDC systems
  • LED trip indicator
  • Built-in 2/3 of RPM test switch to simulate overspeed


Circuit Breaker
Protects system from over current
  • 12 VDC, 30 amps
  • 24 VDC, 30 amps
Magnetic Pickup RPM Sensor
Sensor measures engine flywheel RPM and sends signal to the RevGuard Speed Switch
  • Installs in threaded port
  • Unaffected by dirt or foreign materials collecting at sensor tip
Manual Override Toggle Switch
Enables an operator to manually close the air intake shutoff valve
  • Includes safety thumb guard and decal
  • Option for military switch
  • Silver contacts for durability
3-way solenoid valve
Uses the trip signal to actuate the air pressure to close the air intake shutoff valve
  • 12 or 24 VDC
  • Normally open contacts
  • Simple on/off circuit
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