| 摘要 |
PROBLEM TO BE SOLVED: To provide a steam-heating device of a simple structure by dispensing with a plurality of valves as switching means. SOLUTION: A jacket part 25 of a reaction vessel 20, a positive pressure fluid pressure feeding means 36 and an ejector type vacuum pump 24 are connected through a negative-pressure positive-pressure switching valve 22. The negative-pressure positive-pressure switching valve 22 has a fluid inlet 2, a negative pressure fluid outlet 4 and a positive pressure fluid outlet 5. When the negative pressure fluid flows in from the fluid inlet 2, it is discharged from the negative pressure fluid outlet 4 to the ejector type vacuum pump 24. On the other hand, when the positive pressure fluid flows in from the fluid inlet 2, it is discharged from the positive pressure fluid outlet 5 to the positive pressure fluid pressure feeding means 36. COPYRIGHT: (C)2004,JPO
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