WBV.PU.002.EN VX136Q V2.0
3.2 InjectionSystem
InjectionSystem refers to a special type of pump housing segment for filling optimisation.
The InjectionSystem injects foreign matter directly into the delivery spaces in the pump chamber as they
open, conveying them on to the pump outlet (for improved foreign matter protection).
In addition, an InjectionSystem also improves the internal sealing of the pump.
Injection S (Symmetrical InjectionSystem)
The filling optimisation structure is located at the pump inlet and at the pump outlet. This allows flow in either
direction.
Injection S provides improved pump sealing (with more seal lines), thus allowing higher volumetric efficiency.
Injection A (Asymmetrical InjectionSystem)
The filling optimisation structure is located at the pump inlet only. Therefore, the direction of flow is set in
advance. A brief reverse operation is possible.
Injection A provides improved foreign matter protection with low-viscosity fluids and a high proportion of
foreign matter.
Fig. 1: Flow direction with InjectionSystem
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