Air and water volume control apparatus for hydropneumatic tanks

A hydropneumatic tank control for a water supply system having a closed water tank with a water inlet and outlet, an air compressor to supply pressurized air through a manifold and into said tank and a water pump connected to a water supply to supply water to said tank, said control comprising:

• a tank adapter mounted directly on said water tank,
• a first pressure limit switch mounted on said manifold to detect a low and high air pressure threshold in said tank,
• a second pressure limit switch mounted on said manifold to detect a low air pressure threshold in said tank,
• a first water level electrode for detecting a high water level threshold in said tank,
• a first circuit means for energizing said water pump in response to said first pressure limit switch detecting a low air pressure threshold and deenergizing said water pump when said first pressure limit switch detects a high air pressure threshold in said tank,
• a second circuit means for energizing said water pump in response to said second pressure limit switch detecting a low air pressure threshold in said tank and deenergizing said pump in response to said first water level electrode detecting a high water level threshold in said tank,
• means to connect the first or second circuit means in said control exclusively to select the mode in which the water pump is controlled,
• a third pressure limit switch located in said tank adapter to detect when the air pressure in said tank exceeds a dangerous pressure level threshold, and
• a third circuit means for deenergizing said first and second circuit means responsive to the third pressure limit switch detecting a dangerous pressure level in said tank.