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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.
Locate the circuit breaker that provides power to the well pump, and turn it to the off position. Label each wire that connects to the switch, and disconnect the conduit from the cover. Check the inside of the switch housing for the pressure range of the switch, and replace it with one that has the same range.