3.5 Hydraulic Circuit Design
Following general design rules for the hydraulic circuit shall be considered for a robust operation of the pump
system and optimum priming behavior:
1. The general rule for 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 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 causes cavitation resulting in gas 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 removal of gas bubbles.
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. In general the pump system placement and circuit shall be designed in a way that gas bubbles
can leave the pump housing and that the pump head remains 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.
9. At higher liquid temperature above rules become more important due to higher cavitation
tendency of the liquid.
10. Load and stress at the inlet and outlet by heavy tubing and inexact mounting alignment shall be
avoided (see Figure 24) as this can cause leakage issues due to distortion of the plastic pump
housing.
Figure 24: Avoidance of stress forces and torques at the inlet and outlet of the pump head
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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