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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.
Contacted a local plumber, who troubleshot the the well pump, they said the pump had very low amps, and wanted to pull the well pump (200 feet). They pulled the old pump (13 years old), and advised me to replace the pump. 3/4 Grundfo pump installed, they used same wire which was in good shape replaced adapters on old plastic pipe, new control box.