to injection and hence is to be avoided the problem is exacerbated by higher injection rates in order to address this issue the inventor hereof has determined that the effect of turbulence with respect to its ability to move the flapper into the injection flow can be minimized by reducing the fluid volume between a surface 28 of the flapper 16 and the surface 24 it is to be noted that the surface 28 may be of the flapper itself or may be of a material attached to the flapper in one embodiment the surface 28 is formed by providing a conformable material 30 attached to the flapper 16 the conformable material 30 will assume the shape of the inside surface 24 upon contact therewith and prevent any significant turbulent fluid from urging the flapper 16 away from the surface 24 during injection this embodiment allows for irregularities in the surface 24 to be accounted for without knowing what those irregularities might be more specifically the tubing string in which the valve 10 is installed may have experienced flow cutting or erosion or may have become deformed during run in and resultingly does not necessarily present a cylindrical geometry at the surface 24 for a preconceived surface 28 to geometrically mate with in such situation a conformable material 30 provides a wider range of functional success in reducing any.