Research Control® SRD series of digital valve positioners provide real-time performance statistics and include explosion-proof SRD 960 and intrinsically safe SRD 991 models. Research Control SRI series, also available, comprises analog valve positioners. Used to reduce adverse effects of on-line valve friction, SRD/SRI positioners consequently enable higher thrust and shorter positioning time. Optional limit switches can be added to stroke or rotary actuators to serve as end positions.
This story is related to the following:Valve Positioners