What is engine shut off valve?
Air intake shut off valves provide emergency overspeed shutdown protection for diesel engines and are the most effective way of preventing a runaway situation. The valves completely block the engine air intake system, cutting off an uncontrolled external fuel source and the air required to keep the engine running.
How is a diesel engine shut off?
In simple terms – there is a valve mounted on the rear or side of the diesel fuel injection pump. When vacuum (suction) is applied to this valve, the lever moves and shuts the fuel flow off inside the pump. Without fuel the engine cannot continue to run. If the valve acts quickly the engine will shut off quickly.
What is a positive air shut off?
Positive air shutoff systems are used to protect people and equipment from diesel engine runaway. This occurs when a diesel engine ingests a hydrocarbon vapor and uses it as an uncontrolled fuel source. When this happens, the only way to effectively shut down the engine is by either removing the air or fuel supply.
What is overspeed shutdown?
Diesel Engine Safety Couldn’t Be Easier ThrottleStop Overspeed Protection System is a revolutionary plug-and-play solution to stop diesel engine runaway. The preprogrammed module monitors RPMs and triggers the throttle valve to immediately shut down the engine in the event of an overspeed.
What is the purpose of diesel engine emergency shutdown?
Also known as ASOV, AISV, ESD or emergency shutdown valves, air intake shut off valves are systems that allows for emergency over speed shutdown and protection for diesel engines. They are by far the most efficient systems are used to prevent engines getting into runway situations today.
What causes a diesel engine to keep running after turned off?
Dieseling or engine run-on is a condition that can occur in spark-plug-ignited, gasoline powered internal combustion engines, whereby the engine keeps running for a short period after being turned off, drawing fuel through the carburetor, into the engine and igniting it without a spark.
What is a shocker pass?
Manufacturer of the ShockerPASS positive air shutoff system. A North American built air intake shutoff valve for diesel engines. We prevent diesel engine runaway by monitoring your engine RPM and shutting off the engine air supply with our valve before an engine over speed can occur.
How does an emergency shut off valve work?
An emergency shutoff valve is designed to operate when an accident of this sort dislodges the dispenser. The top portion of the valve shears off, releasing a spring-loaded poppet inside the valve that immediately closes, shutting off the flow of gasoline.
How does an emergency shutdown on a diesel generator work?
Emergency shutdown operation is different from normal shutdown operation. Emergency shutdown operation. Once the operator finds that there is a serious fault or distribution fault in the diesel generating set, he can press the emergency stop button of the control panel to stop the unit immediately.
What makes up an emergency shut down system?
Traditionally risk analyses has concluded that the Emergency Shutdown system is in need of a high Safety Integrity Level, typically SIL 2 or 3. Basically the system consist of field-mounted sensors, valves and trip relays, system logic for processing of incoming signals, alarm and HMI units.
How do you shut down a diesel engine?
Normal shutdown operation. Before stop the diesel genset, the load should be cut off first, and the fuel pump switch handle is immediately turned to the position where the oil circuit is cut off, so that the diesel engine immediately stops; the pressure gauge value of the unit drops below the specified value.
How does an oil and gas emergency shutdown system work?
Basically the system consist of field-mounted sensors, valves and trip relays, system logic for processing of incoming signals, alarm and HMI units. The system is able to process input signals and activating outputs in accordance with the Cause & Effect charts defined for the installation.