Novel stop valve

The invention discloses a novel stop valve, belongs to the field of stop valves for thermal generator sets, and solves the problems that existing stop valves for thermal power and nuclear power units are inconvenient to disassemble and assemble and high in cost. The novel stop valve comprises a valve body, a valve seat, a valve clack, a support, a valve rod and a valve rod nut, wherein the valve seat is arranged in the valve body; the valve clack is mounted in an inner cavity of the valve body; the valve clack is connected with the valve rod and arranged on the valve seat; the valve body is connected with the support; a first arc-shaped boss is arranged on the side wall of the upper portion of the valve body; a first positioning table is arranged on the side wall of the valve body; the first positioning table is located below the first arc-shaped boss; an arc-shaped clamping sleeve matched with the first arc-shaped boss is arranged on the inner wall of the lower portion of the support; the first arc-shaped bo