In order for the vane pump to function properly, the vanes must always contact the cam wall to form a tight seal. The centrifugal force provides some force to actuate the blade, but the force itself is insufficient. The hydraulic force exerted by the pumped liquid tends to push the blade back into the rotor. Typically, this is accomplished by determining the discharge pressure below the blade through a slit in the side panel or a hole in the blade. Newer models such as the Z-Series and PZ Series have blade/blade drives that allow the blades/blades to maintain a better seal against the cam.
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