Patent ID: 7841412

Claim:
A valve for downhole use in a tubular string, comprising: a housing having a flow path therethrough and a first and second connection to said flow path, said first and second connections adapted for connection to the tubular string and represent the only exit or entrance from said flow path to an outside of said housing, said flowpath having at least one lateral exit within said housing; a tubular shaped valve member defining a valve passage that is aligned with said flow path, said valve passage selectively closed by a valve closure secured to said valve member, said valve member having a first position where one way flow is only possible in said flow path through said lateral exit when said lateral exit is unobstructed by said valve member, said one way flow displacing said valve closure and a second position where said flow path is closed by said valve member obstructing said lateral exit of said flowpath, said valve member moving between said first and second position in response to pressure delivered into said housing through one of its said connections from the tubular string.