Metal butterfly valve keeps warm and covers

The utility model relates to a cover that keeps warm, metal butterfly valve keeps warm and covers especially, including shell, heat preservation, the shell wraps up in the heat preservation outside, the shell includes a waterproof case and the 2nd waterproof case, a waterproof case lies in the 2nd waterproof case outside, a waterproof case and the 2nd waterproof case are formed by the concatenation of cubic waterproof material, a waterproof case's cubic waterproof material and the 2nd waterproof case's cubic waterproof material dislocation stack, cubic waterproof material edgewise sets up a plurality of trapezoidal pieces that fall, cubic waterproof material with in on one side adjacent two fall dovetail of trapezoidal piece intermediate formation, every adjacent two cubic waterproof material fuse through falling mutual concatenation of trapezoidal piece, a waterproof case skin scribbles isolated conductibility thermal barrier coating material for metal butterfly valve keeps warm and covers dismantles conveniently, and it is effectual to keep warm.