Patent ID: 7413164

Claim:
A sealing member which includes an elastic substance and is provided in any one of a valve disc and valve seat composing a valve provided so as to disconnect communication between a first space having a first pressure and a second space having a second pressure that is lower than said first pressure, the valve disc having an annular groove that includes an inclined portion, said sealing member comprising: a first annular portion formed on the side of said first space, with said first pressure applied thereto; a second annular portion formed on the side of said second space, with said second pressure applied thereto; an annular protrusion provided at a boundary region of said first annular portion and said second annular portion at a surface facing the other of said valve disc and said valve seat; and an inclined portion, provided behind said annular protrusion, having a shape that is inclined from said first space to said second space so as to come close to said annular protrusion, wherein the inclined portion of the annular groove is configured to cause the elastic substance to flow from the first annular portion to the second annular portion.