A fuel shutoff solenoid is an electromagnetically operated valve that remotely shuts off fuel supply to an engine. It consists of a valve body with an integral solenoid assembly connected to the valve stem. The solenoid can be activated manually or by an automated engine management system. It is commonly used in various applications, including as an engine cutoff or part of an automated security system.
A fuel shutoff solenoid is an electromagnetically operated valve used to remotely shut off the fuel supply to an engine. The solenoid usually consists of a valve body with an integral solenoid assembly connected to the valve stem. When the solenoid is activated, the movement of its plunger retracts the spring-loaded valve seat from its seat, allowing fuel to pass through the valve. When the solenoid deactivates, the valve spring pulls the check valve back onto its seat, effectively shutting off the flow of fuel. The shutdown solenoid can be activated manually or be part of an automated engine management system.
Solenoid valves are among the most commonly used remote fluid flow devices and are used in a wide variety of applications. The fuel shutoff solenoid is one such device that is used remotely, and in some cases, automatically shuts off the fuel supply to an engine or burner. These valves are generally one piece units consisting of two separate devices. The first is the actual fuel shutoff valve which, in most cases, is a fairly conventional brass valve. The valve’s operating stem is connected to the plunger of a solenoid that is usually mounted on top of the valve body.
When a suitable electrical current is passed to the solenoid coil, a strong magnetic field is created around it. This field attracts the plunger of the solenoid and rapidly pushes it towards the coil. Connected to the valve stem, the moving solenoid plunger lifts the valve off its seat allowing fuel to pass through the valve. When power to the fuel shutoff solenoid is removed, the valve spring pulls the check valve to its seating position, closing the valve and resetting the solenoid for the next duty cycle.
The power that activates the fuel shutoff solenoid can be controlled manually or by an automated system, or both. In some cases, the shutdown solenoid can be used as an engine cutoff, as is the case on many jet aircraft, or as part of an automated security system. These valves typically open when the system startup sequence is initiated and close if a dangerous condition is detected. This immediately cuts off the flow of fuel to the burner or motor, effectively preventing any escalation of the hazard. The valves are also commonly used as part of various types of vehicle security systems, cutting off the fuel supply in the event of vehicle theft.
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