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COMPRESSOR CAPACITY CONTROL
The capacity of the compressor is controlled by the action of the Turn Valve and the Compressor Inlet
Valve.
The turn valve controls compressor delivery to match demands of 40% to 100% of the compressor’s
maximum capacity. The inlet valve throttles to control compressor delivery to match demands of 0% to
40% of the compressors maximum capacity.
Example with normal setting of 100 PSIG:
Compressor Delivery
Inlet Valve Position
Turn Valve Position
Discharge Manifold
Pressure
(psi)
Full Capacity
Open
Closed
100
70% Capacity
Open
50% Open
100
40% Capacity
Open
Full Open
100
30% Capacity
Closing
Full Open
103
20% Capacity
Closing
Full Open
103
0% Capacity
Closed
Full Open
103