| 摘要 |
PURPOSE:To correctly form a flow passage by inserting the first and the second heat-resisting members from the both sides of a valve piece arranged in a casing and fitting pressing members onto the both sides. CONSTITUTION:As for the outer cylinders 34 and 34a made of steel, the outside diameter is the cylindrical first heat-resisting member fitted onto the inside diameter of an outer cylinder 31, and the semicircular cut parts 35 and 35a into which a valve shaft 22 is inserted are formed in the upper part. The second heat-resisting members 36 and 36a in cylindrival from longer than the first heat-resisting members 34 and 34a are fitted onto the inside diameters of the first heat-resisting members 34 and 34a. The first and the second heat-resisting members are divided into two parts from the center to form symmetrical structure, and inserted onto the both sides of the valve piece 2 arranged at the center in the outer cylinder 31, and said valve piece is supported in rotatable ways. The pressing members 43 and 43a in symmetrical structure are fitted onto the outer peripheral part of the both heat-resisting members, and stop metal fittings 46 and 46a are fitted onto the outer peripheral parts of the pressing members, and welded onto the inside wall of the outer cylinder 31, and these members are integrally jointed and fixed.
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