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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.
Your pump tank, or well tank, is the blue steel tank in your home. It is generally in your basement or in a utility closet and has the well pipe from your well pump connected on one side and the cold water main to your house connected on the other side. This is how your pump tank works: Inside of that tank are two bladders that sit on top of each other. The top bladder is completely sealed and filled with air. The air pressure in the tank varies for the house, but the standard is when the tank has no water in it we pre-charge the air pressure to 38psi. The bottom bladder is a water reservoir that is connected to the plumbing system. When we first turn on the well pump it fills the bottom bladder of the well tank with water.