This one of a kind Diaphragm valve is highly recommended to be used with aggressive media. Its features unclude a flow-optimized body, zero dead volume, a removable radial true union and spigot connections and a unique self-draining quality. This manually operated valve is compact in appearance specifically designed to consist of plastic bodies, a diaphragm seal, a PPS bonnet and a PPS hand wheel which controls the flow. The easily replaced diaphragm functions either as a switching element and a seal element towards the outside. The revolutionary valves consists of no dead volume and may be mounted to be self-draining.