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Series I
Series B and J
Series R
Series AP
Series T
Series LS

Series AP

Product Detail

bulletProcess Control Device
bulletUtilized with Series B & J Cylinders
bullet2 1/2" - 8" Bores
bullet250 PSI Pneumatic

C31 and J21 or J22 Actuator Positioner for Air Cylinders

Ideal for the Positioning of:

  1. Butterfly Valves
  2. Dampers
  3. Louvers
  4. Gas and Oil Burner Valves
  5. Blast Gates
  6. Variable Pitch Fans
  7. Metering Pumps
  8. Speed Change

Positioner cylinder operating pressure: 20 PSI to 100 PSI air only.

Standard: Instrument Span: 12 PSI
Range: 3 PSI to 15 PSI
Consult factory for other options.

Repeatability: 1/8" to 1/4" on all positioners.

2DO NOT ROTATE PISTON ROD. This will affect factory setting.

Mounting Options: Flush mount (except Model B490)
Front face mount
Front flange mount (from Series B & J)
Front, rear or center trunnion (from Series B & J)
Accessories (from Series B & J)

Positioner Specifications

The C31 Positioner is a single acting, spring return. The piston rod extends on instrument air increase. A spring on the piston rod end causes the piston rod to retract as instrument air is decreased or lost. If air supply is lost, piston rod will retract. The extending force is diminished by the spring force; therefore, it is impossible to get 100% force in either direction.

Model Spring Forces Available Strokes
B490 Consult Factory 2" - 10"
B700 Not Available 2" - 10"
B960 Consult Factory 2" - 10"
B1600 Consult Factory 2" - 10"
B1960 Not Available  
J2800 Consult Factory 2" - 10"
J5000 Consult Factory 6" - 14"

The J21 or J22 Positioners are double acting. The J21 starts out with the piston rod fully retracted and extends on instrument air increase. The J22 starts out with the piston rod fully extended and retracts on instrument air increase. 100% force in both directions is possible with the J21 or J22.

Standard stroke lengths are 2" through 14" in 1" increments.

C31 Specifications J21 or J22 Specifications
Supply Pressure Effect: Less than 0.15% per PSI Supply Pressure Effect: Less than 0.15% per PSI
Ambient Temperature Range: -20°F to +150°F Ambient Temperature Range: -20°F to +150°F
Flow Capacity (Dynamic): Up to 5.0 SCFM in either direction with a 100 PSI supply. Flow Capacity (Dynamic): Up to 5.0 SCFM in either direction with a 100 PSI supply.
Air Consumption (Static) 0.3 SCFM with 40 PSI supply pressure. Air Consumption (Static) 1.0 SCFM with 40 PSI supply pressure.
Air Supply: 20 PSI to 100 PSI Air Supply: 20 PSI to 100 PSI
Adjustment: Zero adjust is external and can be made without tools. Adjustment: Zero adjust is external and can be made without tools.

STANDARD REPAIR KITS CAN BE USED TO REPAIR J21 OR J22 CYLINDERS. C31 CYLINDERS SHOULD BE REPAIRED AT THE FACTORY BECAUSE OF HIGH COMPRESSION SPRING INSIDE.

REPLACEMENT C31, J21 OR J22 POSITIONERS, RANGE SPRING OR RANGE SPRING ASSEMBLIES CAN BE PURCHASED. CONSULT FACTORY FOR OTHER PARTS.

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