Patent ID: 7637482

Claim:
A liquid substance supply device that supplies gas via a gas supply line to a substance container which stores a liquid substance comprising a liquid organometal or an organometal solution, supplies the liquid substance by pressure of the gas to a liquid substance transfer line, and supplies the liquid substance to a vaporizer via said liquid substance transfer line, comprising: a four port three valve directional control valve that is of unitary structure and comprises a first valve body which is provided between a first conduit and a second conduit and performs an ON-OFF control of transfer of fluid between said first conduit and said second conduit, a second valve body which is provided between said first conduit and a third conduit and performs an ON-OFF control of transfer of fluid between said first conduit and said third conduit, and a third valve body which is provided between said third conduit and a fourth conduit and performs an ON-OFF control of transfer of fluid between said third conduit and said fourth conduit, said first conduit being provided between said first valve body and said second valve body, said third conduit being provided between said second valve body and said third valve body, wherein: four port three valve directional control valve is provided between said liquid substance transfer and said gas supply lines and said substance container; said first conduit and said gas supply line are connected together; said second conduit and a gas region of said substance container are connected together; said third conduit and said liquid substance transfer line are connected together; said fourth conduit and a liquid region of said substance container are connected together; and said substance container and said four port three valve directional control valve can be attached to and removed from said gas supply line and said liquid substance transfer line as one unit.