Section 11. A deed in substance following the form entitled ''Quitclaim Deed'' shall when duly executed have the force and effect of a deed in fee simple to the grantee, his heirs and assigns, to his and their own use, with covenants on the part of the grantor, for himself, his heirs, executors, administrators and successors, with the grantee, his heirs, successors and assigns, that at the time of the delivery of such deed the premises were free from all encumbrances made by him, and that he will, and his heirs, executors and administrators shall, warrant and defend the same to the grantee and his heirs and assigns forever against the lawful claims and demands of all persons claiming by, through or under the grantor, but against none other.