German term (edited): 3/2 Wegeventil Tastrolle bet�tigt mit pneum. R�ckstellung

3/2 means 3 port / two way i.e. 3 connections (for air) and two positions (internal ways).
Roller-lever: the valve is actuated (switched) into one of its two positions by pressing on a lever with a roller on the end of it (Tastrolle).
Air return: the valve is returned (switched) to its original position by applying pneumatic pressure to the opposite end of the valve (i.e. opposite to the lever-roller).

This type of valve is always pneumatic. In English we write air-return (pneumatic is selbstverständlich), and we say "return" rather than "reset" (reset has other implications).