Pneumatic cylinders suffer from a limitation that these can be
stopped at only extreme position of either at the front end or rear end.
Many applications such as in thermal power plants, steel plants, cement
plants, textile units and other chemical and petrochemical process
industries call for stopping of pneumatic cylinders at select
intermediate positions for controlling of the degree of opening of
dampers on knife gate valves or butterfly valves or other valves and
in turn controlling process parameters. Schrader Duncan Limited offers
Pneumatic Positioners, Electro Pneumatic Positioners and Smart
A sleek guide mechanism is used for position
feedback and avoids clumsy linkages. Available in cylinder bore
sizes ranging from 50 to 350mm and upto 1000mm stroke length.