Patent ID: 7452498

Claim:
A pressure controlling apparatus for controlling a pressure in a container capable of storing a molten metal and supplying the molten metal to an outside using a pressure difference, comprising: a supplying portion for supplying a compressed gas to be supplied to the container; a flow passage for supplying the compressed gas from the supplying portion to the container; a first switching valve, being inserted into the passage, capable of manually switching a first mode that enables the passage of the gas between the supplying portion side and the container side and a second mode that enables the passage of the gas between the container side and the outside; an exhausting portion for exhausting a gas from the container; and a second switching valve for switching a pressure applying mode for applying a pressure to the container and an exhausting mode for exhausting the gas from the container, wherein the flow passage includes a first path for connecting the supplying portion and the second switching valve, a second path for connecting the exhausting portion and the second switching valve, and a third path for connecting the second switching valve through to the container side, and wherein the first switching valve is inserted into the third path.