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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.
If your pump sits above ground or in the basement, you have a jet pump. This type of pump draws water out of your well through either one or two pipes that run to the well. A jet pump is often combined with a pressure tank. If your pump has one pipe going to the well, you have a shallow well jet pump. If it has two pipes, you have a deep well jet pump. If you have a single pipe coming from your well and into your home that may connect to a pressure tank, you have a submersible pump.