D
–EIMWC00508-16EN - 26/48
Spring Force + Oil Pressure
Suction/Discharge Differential Pressure = Slide valve moves toward unload
Suction/Discharge Differential Pressure > Spring Force = Slide valve moves toward load
C
APACITY
C
ONTROL
A
CTION
S
OLENOID VALVE
A
1
S
OLENOID VALVE
B
Load compressor
Oil is vented from the capacity control cylinder. The suction/discharge
differential pressure overcomes the force of the spring and moves the slide
valve towards the maximum load position.
Energised (open)
De-energised
(closed)
Unload compressor
High-pressure oil is admitted to the capacity control cylinder. The force of the
spring supplemented by oil pressure overcomes the suction/discharge
differential pressure and moves the slide valve towards the minimum load
position.
De-energised
(closed)
Energised (open)
Hold slide valve position
The slide valve is hydraulically locked at the desired load position.
De-energised
(closed)
De-energised
(closed)
Fig. 14 - Capacity control mechanism
Unload
Carico Compressore
Load
Summary of Contents for EWWQ380B-SS
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