The impeller cover (diffuser) for ESPA Silen 100 and Silen S 100 pumps is a stationary hydraulic component that surrounds the impeller and converts the kinetic energy of the water into pressure.
A correctly shaped diffuser is essential for the pump’s hydraulic efficiency — damage or cracks lead to internal bypassing and a drop in flow.
The shared design for both the Silen 100 and Silen S 100 models allows a single spare part to be used for both ranges, simplifying stocking and servicing.
The diffuser is replaced after removing the front pump section and loosening the fastening screws, without the need to dismantle the entire unit from the pipework.
Original ESPA manufacturing guarantees the precise geometry of the flow channel, which is a prerequisite for restoring the pump’s original performance.
