| 摘要 |
PURPOSE:To stabilize a valve opening operation by providing a high pressure valve which can simultaneously close high pressure side inlet and outlet ports on one side while closing a low pressure side port on the other side, and expediting pressure drop on said low pressure port which serves as a driving force for opening this valve. CONSTITUTION:A high pressure side inlet port 72 which is always connected into an enclosed container 51 and a high pressure side outlet port 74 which is always connected to a discharge pipe 73 are provided adjacent to each other. Also, a low pressure side port 76 which is connected to a low pressure part through an introducing passage 79, is provided opposite to the high pressure side inlet port 72 and the high pressure side outlet port 74, while providing a disk-like high pressure valve 77. This high pressure valve 77 simultaneously closes the high pressure side inlet port 72 and the high pressure side outlet port 74 on one side by means of a bias spring 78 while it can close the low pressure side port 76 on the other side. Thereby, it is not necessary to reduce a clearance between a ball valve and a valve cylinder in which the ball valve slides as in the conventional case, and pressure drop on the low pressure side port 76 which serves as a driving force for opening the high pressure valve 77, can be carried out securely and in a short time, stabilizing a valve opening operation.
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