Century Instrument Co. - Valve Positioners

For automatic throttling control a valve positioner is required.

The positioner accepts a 3 - 15 psig. or 6 - 30 psig. variable signal from a control instrument or D/P cell and positions the valve in its stroke to maintain a constant and stable condition of pressure or flow in accordance with a varying demand or load.

For information on Electro-pneumatic positioners to accept a milli-amp signal and convert it to a pneumatic signal contact the factory or your nearest sales representative.

Unit of Measure

Items	73N12F Valve Positioners	73N12FG Valve Positioners	73NB Valve Positioners	73NBG Valve Positioners	72P315 Valve Positioners
Description	N/A Built-in Top-Loading with No Output Gauge Built-in Positioner for Type "C" (air to air) and type "H" (air close-spring open) No. 73N12F is top-loading positioner, therefore on a rising instrument air signal the valve will close.	N/A Built-in Top-Loading with Output Gauge Built-in Positioner for Type "C" (air to air) and type "H" (air close-spring open) No. 73N12FG is top-loading positioner, therefore on a rising instrument air signal the valve will close.	N/A Built-in Bottom-Loading with No Output Gauge Built-in Positioner for Type "C" (air to air) and type "H" (air close-spring open) No. 73NB is bottom-loading positioner which means that on a rising instrument air signal the valve will open.	N/A Built-in Bottom-Loading with Output Gauge Built-in Positioner for Type "C" (air to air) and type "H" (air close-spring open) No. 73NBG is bottom-loading positioner which means that on a rising instrument air signal the valve will open.	N/A Side-Mounted with Bypass & Gauges Side Mounted Positioners for Air to Open-Spring closed Valves Side mounted positioners can be adjusted so that on a rising instrument air signal the valve will open or close as required. All the above positioners are suitable for operating air pressures of 100 psig. For information on Electro-pneumatic positioners to accept a milli-amp signal and convert it to a pneumatic signal contact the factory or your nearest sales representative.
Positioner Type	N/A Built-in	N/A Built-in	N/A Built-in	N/A Built-in	N/A Side Mounted
Air Pressure	N/A 3 - 15 psig6 - 30 psig	N/A 3 - 15 psig6 - 30 psig	N/A 3 - 15 psig6 - 30 psig	N/A 3 - 15 psig6 - 30 psig	N/A 100 psig