This diaphragm valve sets new standards regarding safety, efficiency and simplicity. Instead of the commonly used four metal screws it has a central union nut - this non-corrosive connection is characterized by homogeneous temperature behavior, an even surface pressure and pressure rating up to 150 psi. The optimal flow geometry offers double the Cv values. With almost linear flow characteristics this guarantees stable processes. The weir of the zero-static valve has been reduced to an absolute minimum and thus the purity was increased at the same time. Lockable handwheel, two-colored indicator and an interface for a self-adjusting limit switch. EPDM seals and diaphragm. Valves have socket end connections.