PRESSURE CONTROLLER FOR PRESSURIZED DIVING TANK

PURPOSE:To control the pressure in a diving tank by discharging a gas contained in the tank and enhance the accuracy of the control, by a method wherein a gas chamber communicated with a liquid phase part of a diving tank is provided, and a pressure difference between the gas chamber and the liquid phase part is measured. CONSTITUTION:The gas chamber 18 communicated with the liquid phase part 25 of a pressurized diring tank 1 is provided, and it is also provided with a gas- supplying valve 20 and an exhaust valve 22. After a diver 2 dives, the interior of the tank is pressurized by opening gas-supplying valves 4', 20, and the supply of a gas is stopped when a predetermined pressure is reached. Thereafter, when the pressure in the tank is raised by the gas supplied from cylinders 13 and expired by the diver 2, the water level 23 is lowered, and the pressure in the gas chamber 18 is raised. A pressure difference measuring transmitter 21 detects the rise of the pressure in the tank by measuring the pressure in the chamber 18, and controls an exhaust valve 11, thereby maintaining the pressure in the tank to be constant. The accuracy of detection can be enhanced by reducing the diameter of a connecting trunk 19 for the gas chamber 18.