| 摘要 |
PROBLEM TO BE SOLVED: To provide an equalizing valve for measuring differential pressure and a differential pressure type flowmeter, capable of making size compact, of simplifying, and of reducing the cost. SOLUTION: The first inlet passage 361 is extended along the axial direction of a valve stem 351, in the equalizing valve 35 assembled in the differential pressure type flowmeter, and a tapered part 351H provided around an axis of the valve stem 351 is advanced and retreated along the axial direction, to conduct switching from a differential pressure condition to an equalized condition. The equalizing valve 35 is made compact therein by the overlapped section where the advanced and retreated section for the valve stem 351 is overlapped with a valve passage 352. Pressure unevenness, caused by flow delays between the first lead-out passage 371 and the second lead-out passage 372, is reduced, since a distance between the first lead-out passage 371 and the second lead-out passage 372 is shortened by making compact. A valve element of the equalizing valve 35 is also easy to be assembled to contribute to reliability and cost reduction, because the valve element has simple structure, such as the tapered part 351H. COPYRIGHT: (C)2007,JPO&INPIT
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