The 81523601 is a pneumatic bistable memory element designed for industrial automation and control applications. It functions as a 4/2 directional control valve that stores and maintains pneumatic signals, delivering output at normal industrial pressure. The device features a manual override capability and integrated pressure indicator for enhanced operational visibility. Operating across a pressure range of 2 to 8 bar with an orifice diameter of 2.7 mm, it delivers 200 NI/min flow at 6 bars and maintains its state until a new command signal is received. With a mechanical life exceeding 10 million operations and operating temperature range of -5°C to +50°C, this memory element is ideal for pneumatic logic circuits, automation sequences, and control systems requiring reliable state retention in industrial environments.