Chapter 4 Compressor Safety
39
CONTROL SYSTEM OPERATION
The following discussion explains the operation of the control system from a condition of “no
load” to a condition of “full capacity” at working pressure. For the working pressure range of
your machine, refer to applicable data in “Specifications”.
The pressure regulator, mounted on the coalescer head, operates as follows:
1
As the demand for air decreases, the receiver pressure rises. When this pressure exceeds
the set point of the pressure regulator, the regulator opens sending a secondary pressure
signal to the inlet valve. The poppet valve moves towards the valve inlet against the force of
the modulating spring inside the valve. This regulates the opening area of the inlet valve.
2
If the air demand goes to zero, (service valve closed or air dead headed at tool) the inlet
valve will close completely.
3
As the demand for air increases, the secondary pressure signal to the inlet valve is removed
and the inlet valve poppet modulates to full open.
