Opposite top type oil tank isolating valve

The invention discloses an opposite top type oil tank isolating valve in the technical field of automobile isolating valves, which comprises a valve casing, a pipe cavity for air passage circulation is arranged in the valve casing, the pipe cavity is divided into an upper pipe cavity and a lower pipe cavity by an inner ring table, the upper pipe cavity and the lower pipe cavity are communicated through a vent hole in the middle of the inner ring table, and an oil tank pipeline joint communicated with the upper pipe cavity is arranged on the valve casing; an electromagnetic coil assembly is arranged at the upper end of the valve shell, and a bottom cover and an upper valve head assembly are arranged at the bottom of the valve shell to block or open the vent hole. The lower valve head assembly is used for blocking or opening the vent hole, and a pressure relief gas circuit is arranged in the upper valve head assembly; the electromagnetic coil assembly is installed at the top of the valve shell and used for cont