Decompression non-return digital control valve

The invention discloses a decompression non-return digital control valve. The control valve comprises a valve body, a valve seat and a valve clack, wherein the valve clack is provided with a valve rod, a middle frame and an upper frame are sequentially arranged above the valve body, an induction mechanism is arranged in the upper frame and the valve rod penetrates through the middle frame and is in contact with the lower end plane of the induction mechanism; a plurality of inwards concaved valve clack rings are arranged on the periphery of the valve clack, the upper end of the valve clack is provided with a plurality of vertically distributed vertical holes, and openings are formed in one side of the valve clack at one sides of the vertical holes; a sleeve sleeves the valve seat, and circular holes are formed in the upper sleeve peripherally and are distributed from small to large and from bottom to top. The effects of cooling and expansion discharge can be realized by installing the valve clack rings and forming the plurality of holes in the valve clack peripherally, therefore the decompression failure caused by the expansion of the valve clack at high temperature can be prevented; furthermore, the circular holes of different diameters are peripherally formed in the upper sleeve, and the starting height of the valve clack correspond to the heights of the circular holes in the upper sleeve by adjusting the pressure of the induction mechanism, therefore the digital observation on the circular holes corresponding to different pressure valves can be realized.