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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.
Clogs in your well pump can be fixed for $100 to $300, depending on where the clog is. Repairing broken inlet or outlet hoses are more expensive. Often times, repair cannot be possible if the damage is to the unit itself. If the unit is repairable, expect a cost of $200 to $500 to repair the pump to working form. Pipe breaks underground are another matter. If you are experiencing a loss of water pressure in the system, chances are there is a leak somewhere in the line.