| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an automatic valve which securely closes an inflow port (a valve seat) and achieves excellent sealability.SOLUTION: An automatic valve includes: a casing 10 provided with an inflow port of a fluid; an annular valve seat 31 formed by an elastic body; an annular fixing member 33 which fixes the outer periphery side of the valve seat 31 to a periphery of the inflow port; and a float which is housed in the casing and contacts with an inner periphery side tip 31a of the valve seat 31 to close the inflow port. The fixing member 33 includes: an annular base part 34; and a sandwiching part 35 which protrudes inward from the inner periphery side of the base part 34 and sandwiches upper and lower surfaces (an upper surface 31u and a lower surface 31d) of an outer periphery side end part of the valve seat 31 with a lower surface of a lid 12. A space S is provided between a part of a surface facing the valve seat 31 and the valve seat 31 at the sandwiching surface side of the sandwiching part 35.</p> |
