A gas-regulating unit for regulating a gas pressure in a gas-tight tank

摘要

A gas-regulating unit (10) for regulating an internal gas pressure in a gas-tight liquid-storage tank is mounted on the gas-tight tank in which stored liquid is sealed from outside atmosphere by covering a top surface of the stored liquid with an isolating-gas. The gas-regulating unit (10) includes a main gas-exhausting unit (3) and an isolating-gas regulator (4). The main gas-exhausting unit (3) includes an exhaust valve (8) for opening and exhausting gases from the gas-tight tank (1) when an internal gas pressure in the gas-tight tank (1) increases to more than a specified level. The isolating-gas regulator (4) supplies the isolating-gas when an isolating-gas pressure decreases to less than a specified level. The main gas-exhausting unit (3) and the isolating-gas regulator (4) are integrally coupled with each other.