| 摘要 |
PURPOSE:To maintain a pressure in a pressurized container to a constant value by adjusting a pressurized fluid for control introduced from an external part into a metallic bellows with a programmable controller and setting a pressure in the metallic bellows to a prescribed value. CONSTITUTION:Even when the pressurized fluid for control is not introduced into a metallic bellows 22, since a valve 21 is pressured on a valve seat 23 by the elasticity of the metallic bellows, when the pressure force is Po and a pressurized fluid pressure for control in the metallic belows is set to Ps, the valve 21, is pressured on the valve seat 23 by a pressure of Po + Ps. A fluid in a pressurized container 1, when a pressure P1 exceeds the pressure of the Po + Ps, presses down the valve 21 and flows out and the pressurized container 1 is maintained at the pressure P1. Then, when a reaction in the pressurized container is to be executed by the pressure P1 and the pressurized fluid pressure for control Ps is set to a value equal to P1 - Po in the metallic bellows, the pressurized container is maintained at the pressure P1.
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