Pneumatic Actuator (BT Series) KT Pneumatic Actuator (Double-Acting and Single-Acting) is used to control quarter-turn valves such as ball valve, butterfly valve, etc. I. Air supply connection is designed in accordance with NAMUR Standard to install solenoid valves II. Bottom mounting connection is designed in accordance with ISO 5211, DIN 3337 standards for direct mounting Of valve gear boxes or mounting brackets. III. The NAMUR drive shaft and NAMUR top mounting connection allow the installation of accessories such as limit switch box and positioners.