The sealing ring is also called the leakage reducing ring. The gap between the impeller inlet and the pump casing is too large to cause the water in the high-pressure area of the pump to flow to the low-pressure area through this gap, which affects the water output of the multistage pump and reduces the efficiency! If the clearance is too small, friction between the impeller and the pump casing will cause abrasion. In order to increase the reflux resistance, reduce internal leakage, and delay the service life of the impeller and the pump casing, a sealing ring is installed at the junction of the inner edge of the pump casing and the external aid of the impeller, and the sealing gap should be kept between 0.25 and 1.10 mm.
