Selection of Reservoir Capacity

(1) Selection Based on Pump Output Capacity
Generally, reservoir capacity should be three to five times larger than the pump output capacity. In a closed circuit, the reservoir capacity can be about 50 percent of the pump output capacity.
(2) Selection Based on Oil Level Variation
The amount of oil in a reservoir fluctuates with actuator operation. The reservoir should have return and suction lines where the oil can be kept, regardless of oil level fluctuations. Capacity that is three times larger or more than the minimum oil level is generally recommended.
(3) Selection Based on Heat Radiation Area
Heat generated by hydraulic equipment is radiated from the reservoir surface. The recommended reservoir size is, therefore, determined by the presence of a heat exchanger.
(4) Selection Based on Space of Reservior Top
For mounting of a pump, a motor, and valves on the reservoir top, the space of the reservoir top should be taken into consideration.
(5) Compliance with the Safety Laws
The law stipulates that empty space in a reservoir must be equal to or less than ten percent of the reservoir capacity in Japan.
Figure 12.1 shows an example of a hydraulic unit containing a pump, a motor, and control valves. The figure also shows names of optional components and settings.

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