The Safoco FRV utilizes a gate vlave and is controlled by a "fail open" hydraulic actuator. Pressure is sensed by two pressure transducers. The pressure at which th evlave opens and recloses are field programmable via a keypad interface. The valve is held in the closed position with hydraulic fluid until an event casues the system to release the hydraulic fluid. The electric controls read the pressure then relase the hydraulic fluid. The valve is forced into the open position immediately by the line pressure in the valve adn 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.