-Utilized with Series B & J Cylinders
-2 1/2" - 8" Bores
-250 PSI Pneumatic
Material And Design Specifications
C31 and J21 or J22 Actuator Positioner for Air Cylinders Ideal for the Positioning of:
- Butterfly Valves
- Gas and Oil Burner Valves
- Blast Gates
- Variable Pitch Fans
- Metering Pumps
- 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)
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.
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.
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.