The series are mostly self-priming jet pumps.Self-priming is achieced by using an ejector,housed in the pump body.The total delivery produced by the closed centrifugal imperller is sent only partly to the delivery opening.The remaining water isre-circulated through the ejector ,which is connected to the suction chamber and generates the necessary vacuum to sele-prime the pump. When we first starting the pump,fill the pump body with water without bothering to fill the suction piping and eliminate any air pockets.When the pump is started up ,the water in the pump body circulates through the ejector and vacuum thus generated causes water to rise in the suction piping ,thus self-priming the pump.

Since the self-priming system operates continuously,these pumps are practically unaffected even by the presence of large amounts of entrained air in the fluid being pumped.

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