Burkert's 2031 diaphragm valve and 8630 control system permit a variety of on/off, positioning and proportional control options. The 2031 is designed to accommodate polluted, dirty, abrasive and high-viscosity fluids. With a two-way 316L stainless steel body, the unit is an alternative to ball valves. The 8630 is a self-calibrating digital positioning unit that provides continuous functionality. PID values can be automatically set to control a process.