Haldex’s Reservoir Purge Valve is engineered to keep contaminants from building up in the reservoir by purging the tank when the parking brake is set or emergency air is released from the towed vehicle. Once the supply air pressure is removed from the valve, the Reservoir Purge Valve opens up the reservoir line to purge, and when the reservoir air pressure reaches 90 psi, the valve shuts off the purge operation, maintaining the reservoir pressure at “ready” and allowing for a quick system recharge for the vehicle’s next trip. The valve’s purge function is not dependent on inputs from electrical, manual or differential tank pressure influences. The valve has a maximum system pressure of 150 psi and an operating temperature range of -45 to 180 degrees Fahrenheit. Serviceable filters, which can be cleaned and replaced without removing the valve from the vehicle, protect the valve from debris. The valve is small, lightweight and has a built-in mounting bracket for easy installation options, including retrofitting to existing vehicles, but must be used in conjunction with a manual drain valve as prescribed in FMVSS121.