Ross Controls Series DM2C Control Reliable Double Valve with Dynamic Monitoring & Memory are designed for Category 4 air dump/release applications. Memory, monitoring, and air flow control functions are integrated into two identical valve elements. Valves lockout if asynchronous movement of valve elements occurs during actuation or de-actuation, resulting in a residual outlet pressure of less that 1% of supply. An action is required for reset, the valve cannot be reset by removing and re-applying supply pressure. Reset can only be accomplished by the optional integrated electrical (solenoid) reset.