3.4 Hydraulic Circuit Design
Following general design rules help to operate the pump system optimally considering efficiency, optimum
priming behavior and low shear forces:
1. The general rule for minimum shear forces and optimum priming behavior is to minimize the
pressure drop in the inlet circuit and avoid negative pressure at the inlet of the pump head.
2. Minimize tubing length at the inlet of the pump head and maximize the ID (not smaller than the
pump head inlet ID of 9.4 mm is recommended). This reduces the pressure drop and the tendency
of cavitation.
3. Avoid any restrictions, valves, elbows, bended tubing and sharp edges at the inlet circuit of the
pump head, which potentially cause cavitation resulting in higher shear forces and bubble
collection in the pump head with the danger of priming loss.
4. Place the pump at the lowest point of the hydraulic circuit. Optimum is as much as possible below
a tank or reservoir. This optimizes priming behavior and keeps the inlet pressure positive for low
shear forces.
5. Keep the liquid level in the reservoir tank or bag as high as possible, which increases the inlet
pressure of the pump head and minimized heat up of the liquid.
6. When horizontal mounting of the driver the optimum outlet angle of the pump head is 45 degree
(see Figure 27) hence allowing gas bubbles to leave the pump head and keep it primed.
7. To minimize heat up of the liquid the overall pressure drop in the hydraulic circuit shall be reduced
as much as possible.
8. It shall be avoided to pump longer times against a closed valve, which can cause heat-up of the
liquid and higher shear forces.
9. At higher liquid temperature rules mentioned above become more important due to higher
cavitation tendency of the liquid.
Contact the Levitronix
®
Technical Service department (see Section 8) for more detailed considerations and
support on the design of the hydraulic circuit.
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