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The spring is typically located around a central shaft that is attached to the closing disk. The entire assembly is securely enclosed in a machined brass housing that contains the workings of the check valve. The check valve is generally located above the submersible pump unit by a few inches. This ensures that the long column of water remains in the well pipe. This increases the efficiency of the pump by not having to refill the length of the pipe every time the system calls for water.
The jet nozzle and venturi are alsoknown as ejectors/ejector kits.On a shallow-well jet pump the ejector kit(jet nozzle and venturi) is located in thepump housing in front of the impeller.A portion of the suction water is recircu-lated through the ejector with the rest go-ing to the pressure tank.hallowwell installations go down to a water depth of about 25 feet. Deep wells are down 150 feetto water, where surface pumps are involved.The jet pump is a centrifugal pump with one or more impeller and diffuser with the additionof a jet ejector. A JET EJECTOR consists of a matched nozzle and venturi.