Chell has created a range of precision needle valves capable of repeatably delivering precise flows. The valves range from 0-20sccm to 0-3slpm . All feature stainless steel construction with Perlast® seals (other seal materials are available

The graph on the left shows the opening characteristics of the No. 1 needle valve (0-20sccm) and below is that of the No. 2 needle (0-1000sccm).