Patent ID: 7114574

Claim:
A by-pass valve mechanism in combination with a well treatment tool having at least one packer element for sealing within the well casing of a well, permitting by-pass of well fluid past the packer element of the well treatment tool during conveyance of the well treatment tool within the well casing, comprising: a by-pass valve housing being connected with a well tool and defining an internal flow passage in communication with a tubing string and at least one by-pass port establishing communication of the internal flow passage with an annulus between said by-pass valve housing and the well casing; a valve element being moveable within said by-pass valve housing between an open position permitting flow of well fluid through said at least one by-pass port and a closed position blocking the flow of well fluid through said at least one by-pass port; at least one retainer securing said valve element at said open position permitting fluid by-pass during tool running and releasing said valve element for closing movement responsive to predetermined fluid pressure.