The new GEMÜ 651 piston operated 2/2-way diaphragm valve is designed for use in sterile applications. It is available in an "Open/Closed" or "position control" version. An automation module is integrated in the actuator. Versions for installation in traditional cabling systems and standard signals as well as an AS-Interface version are available. The device can be mounted, automatically programmed and commissioned when it is used as a position control valve and within a process control system. The valve has Normally closed, Normally open and Double acting control functions and is suitable for inert and corrosive liquid and gaseous media. Due to its compact design it can be used in very restricted spaces, e.g. in valve batteries or as a component in multi-port valve blocks. The standard version has M5 control air connectors in the flow direction. Ninety-degree rotated connectors are optional. The pneumatic actuator housing is made of stainless steel, the automation module housing of PP (polypropylene). The protection class is IP 65, electrical connection is via a 5-pin screwed standard plug.