Polyquip manufactures self-priming pumps for clear liquids. Normal centrifugal pump cannot be used for volatile solvents for negative suctions, because foot-valve elastomers give problems and the pump also faces cavitations. These self-priming pump eliminate the above-mentioned problems, but can be used for clear liquids only. The pump is provided compulsorily with mechanical seal, it does not come with gland packing arrangements. It can take a negative suction pipe length of 3 to 4 metre, without foot valve. Initially, the casing is to be filled with liquid to avoid damage to the seal due to dry running. This pump is provided with star vane type impeller and can be used for low capacities only, up to 50 lpm and heads up to 40 metres. It is an ideal pump for underground storage tanks, barrel emptying and other applications. It is available is ss material of construction only.
