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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.
Well Pump for a Shallow Well. The most commonly used well pump for a shallow well is a jet pump. The pump is normally mounted in a basement, well house or crawl space over the well. This type of pump uses suction to pull the water from the well. An electric motor drives and impeller that in turn moves the water.