Quick-repair wash-free dual-valve-element shut-off valve convenient to replace

The invention relates to the technical field of valves, and more particularly relates to a quick-repair wash-free dual-valve-element shut-off valve convenient to replace. The quick-repair wash-free dual-valve-element shut-off valve convenient to replace comprises a valve body, a valve base, a primary valve element, a limit disc, a secondary valve element, a valve base sleeve, a valve cover, a packing gland, a valve rod and a valve drive mechanism, wherein when the shut-off valve is in the opening and closing states, an assembling unit formed by the primary valve element, the limit disc and thesecondary valve element vertically move, free stroke set in the primary valve element enables the position of the primary valve element to be automatically corrected under the action of the fluid pressure, the secondary valve element does not apply pushing force on the primary valve element downward after the valve elements are all closed in place, the condition that one valve element influencesthe sealing performance of