| 摘要 |
PROBLEM TO BE SOLVED: To prevent lowering of characteristics of a resin by decreasing temper ature difference of the resin in a material path in a valve device and preventing generation of a locally excessively high temperature part. SOLUTION: A linear heater 40 for heating a valve main body 1 is fitted on the outer peripheral face of the valve main body 1 in such a way that doubly folded one is wound into a cylindrical coil-like shape. By linearly extending an apex folded part 42a of the linear heater 40, a connecting part 45 being extended to an apex part of a casing 2 is formed and by opening the apex folded part 42a, an arc-shaped folded part 46 to be fitted on the apex outer peripheral face 1a of the valve main body 1 is formed. In this arrangement, an intermediate part in the axial direction of the valve main body 1 is heated by means of the linear heater 40 and in addition, it is heated by means of the arc-shaped folded part 46 of the linear heater 40. COPYRIGHT: (C)2003,JPO
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