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A submersible pump, which is the type most often used in drilled wells, consists of a pump and motor unit. The pump is placed directly into the well, below the water level. Jet pumps are not installed in the well, but installed above ground. Jet pumps operate by forcing water through a jet or Venturi, a narrow, cone-shaped device that creates a partial vacuum (suction) and draws water from the well into the pumping system. Shallow well jet pumps that are used where the water is less than 25 feet below the surface have the jet located in the pump itself.
When we first turn on the well pump it fills the bottom bladder of the well tank with water. As the tank fills up the top bladder filled with air is contracted and as a result the air pressure builds. On the outside of a tank there is a pressure switch which measures the amount of pressure in the well tank. When the well pump has filled the tank to the point where the top bladder has contracted to 60 pounds of pressure the pressure switch cuts off electric to the pump and water stops flowing. Letâs now say someone in the home goes to take a shower.