either beneficial or necessary to accommodate such situations a bypass conduit 150 can be incorporated in replacement valve 100 such that communication between upper zone 132 and lower zone 130 can occur irrespective of the position of flapper 116 the upper zone 132 tan be a surface location bypass conduit 150 includes an upper segment 152 a lower segment 154 and a passage 156 through replacement valve body 112 of replacement valve 100 bypass conduit 150 can be of any form known to one of ordinary skill in the art but can be a single continuous hydraulic tube a string of threaded tubing sections an electrical conduit a fiber optic conduit a gas lift conduit or depending of the size of replacement valve 100 a logging conduit typically bypass conduit 150 will most often be constructed as hydraulic capillary tubing allowing the injection of a chemical stimulant surfactant inhibitor solvent and foam from a surface location to lower zone 130 furthermore if bypass conduit 150 is constructed to allow the injection of fluid to lower zone 132 from above a check valve 155 may be included to prevent increases in downhole pressure from blowing out past replacement valve 100 through bypass conduit 150 to the surface the term capillary tube is used to describe any small diameter tube and is not limited to a tube that holds liquid by capillary action nor is there any requirement for surface tension to elevate or depress the liquid in the tube the.