Emerson VSG & VSSG Spécifications télécharger pdf (Page 44)

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Section 2 • Operational Descriptions

Single Screw Compressor PLC Operation Manual • Vilter/Emerson • 35391CM

COMPRESSOR

CONTROL

TARGET

100

DISCHARGE

RECYCLE

SETTING

DISCHARGE

PRESSURE

DISCHARGE

RECYCLE VALVE

POSITION (% OPEN)

Figure 2-17. Operational Diagram - Discharge Recycle Valve

DISCHARGE RECYCLE VALVE

Reference Figure 2-17

NOTE

Discharge recycle valve must be controlled by others

when multiple compressors are connected to a

common header.

If installed, the discharge recycle valve is a motorized or

air actuated valve that recycles discharge gas back to the

suction of the compressor. The valve acts as a regulator,

opening to maintain the set pressure in the discharge

line.

A PID controller adjusts the opening degree of the valve

to maintain a desired pressure on the high pressure side

of the valve. When the recycle control pressure exceeds

the desired pressure plus a deadband, the valve will start

to open to recycle high pressure gas back to suction.

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Emerson VSG & VSSG Spécifications Page 44