The Safoco FRV utilizes a gate valve and is controlled by a "fail open" hydraulic actuator. Pressure is sensed by two pressure transducers. The pressure at which the valve opens and re closes are field programmable via a keypad interface. The valve is held in the closed position with hydraulic fluid until an event causes the system to release the hydraulic fluid. The electric controls read the pressure then release the hydraulic fluid. The valve is forced into the open position immediately by the line pressure in the valve and an internal spring within the actuator. The system is completely self-contained, requiring no external power source. The relief system is monitored and controlled by an HMI system in the data van. This system records all pressure readings, settings, and events.