Quiescent Chambers

Test Equipment
1 Use a hydraulic test circuit as illustrated in Figure 1.
2 Size the lines connecting hydraulic components so that turbulent mixing exists throughout.

3. Take precautions to insure against contaminant traps, silting areas, and combinations of cyclonic separation zones and quiescent chambers.

what does quiescnt chamber mean here ? This paragraph is all about solenoid directional control valve. Tks everyone.