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GC31-IOM Rev. B
07/19
Enidine / Conoflow
105 Commerce Way
Westminster, SC 29693
Tel: (864) 647-9521
Fax: (864) 647-7993
INSTRUCTION AND MAINTENANCE MANUAL
GC31 COMMANDAIRE POSITIONER
PRINCIPLE OF OPERATION
The COMMANDAIRE Model GC31 positions the actuator by applying a sufficient air pressure in the load chamber to overcome the cushion load
pressure, plus any external forces or load acting on the actuator stem. An increase in air signal pressure acts on a diaphragm and moves the yoke to
the right. This closes an exhaust port and opens the supply valve. Air flows through the supply valve into the load chamber and drives the piston
downward, extending the actuator stem. Piston movement extends the range spring,
which in turn
, causes the bellcrank to rotate
counterclockwise.
This rotation of the bellcrank exerts a force against the yoke pin and moves the yoke towards a balanced position. A decrease in instrument air pressure
reverses the procedure, closing the supply valve and opening the exhaust port. This vents the pressure in the load chamber to atmosphere and allows
the cushion load pressure to move the piston and retract the actuator stem.
WARNING
Conoflow products are designed and manufactured using
materials and workmanship required to meet all applicable
standards. The use of these products should be confined to
services specified and/or recommended in the Conoflow
catalogs, instructions, or by Conoflow application engineers.
To avoid personal injury or equipment damage resulting from
misuse or misapplication of a product, it is necessary to select
the proper materials of construction and pressure-temperature
ratings which are consistent with performance requirements.
