| 摘要 |
PROBLEM TO BE SOLVED: To restrict moisture from entering into gas equipment showing a negative pressure in it during its operation through a clearance between an insertion hole of an outer case and a plug of a valve unit.SOLUTION: A recess part forming a space between a valve unit and an outer case is arranged at the valve unit in opposition to an insertion hole of the outer case under a state in which the valve unit is fixed to an inner surface of the outer case. This recess part is provided with a plug which is protruded and is inserted into the insertion hole and to which is connected a gas supply pipe in advance and further the inner surface of the outer case enclosing the recess part is provided with a peripheral edge contact part contacted in surface with it. With this arrangement as above, moisture sucked through a clearance between the insertion hole and the plug due to negative pressure inside the outer case is released to a space of the recess part. At this space, since the moisture flow passage is substantially expanded, a flow speed of the moisture is delayed and at the same time the negative pressure is dampened. In this way, the moisture is once stored in the space and it is possible to restrict immersion of moisture into gas equipment as compared with the case in which the space is not present.SELECTED DRAWING: Figure 6 |
