The ROSS Controls DM2DDA54B21 is a solenoid-controlled, pilot-operated double valve from the DM2® Series D family. It is engineered specifically for safety-critical pneumatic applications, such as clutch/brake control on mechanical power presses and other machinery requiring redundant, reliable operation. This valve features a patented dynamic monitoring and memory system that continuously checks for synchronous movement of the two internal valve elements. If an asynchronous fault is detected, the valve locks out, preventing further operation until the system is reset, thereby ensuring the machine returns to a safe state. Its robust, dirt-tolerant design makes it a dependable choice for demanding industrial environments, enhancing machine safety and helping to meet regulatory standards.