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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.
Because the pump cylinder is below the water table, a long pump rod has to reach down to the pump cylinder, connecting it to the pump handle. This complicates the maintenance process since the pump rod, the riser main, and the pump cylinder all have to be removed from the well, which can be hundreds of feet deep.