| 摘要 |
PROBLEM TO BE SOLVED: To provide a steam heating device with simple structure, by eliminating the need of a plurality of valves as selector means.SOLUTION: A jacket part 25 of a reaction vessel 20, and a positive-pressure fluid force-feeding means 36 and an ejector type vacuum pump 24 are connected through a pressure-response operation type negative-pressure/positive-pressure changeover valve 22. The negative-pressure/positive-pressure changeover valve 22 has a fluid inlet 2, a negative-pressure fluid outlet 4, and a positive-pressure fluid outlet 5. Negative-pressure fluid flows in from the fluid inlet 2, and then is discharged from the negative-pressure fluid outlet 4 to the ejector type vacuum pump 24. Meanwhile, positive-pressure fluid flows in from the fluid inlet 2, and then is discharged from the positive-pressure fluid outlet 5 to the positive-pressure fluid force-feeding means 36. |
