Quick-repair type washing-free double-core stop valve convenient to replace

The utility model relates to the technical field of valves, in particular to a quick-repair type washing-free double-core stop valve convenient to replace. The check valve comprises a valve body, a valve seat, a first-stage valve element, a limiting disc, a second-stage valve element, a valve seat sleeve, a valve deck, a packing gland, a valve rod and a valve driving mechanism. The stop valve is opened and closed; an assembly formed by the first-stage valve element, the limiting disc and the second-stage valve element moves vertically. A free stroke is arranged in the first-stage valve core; the position of the first-stage valve core can be automatically corrected under the action of fluid pressure; after the second-stage valve core is completely closed in place, the second-stage valve core does not apply downward thrust to the first-stage valve core; according to the stop valve, the sealing performance of the other valve element is completely prevented from being affected by one valveelement, the distance be