This paper analyzes the high temperature resistance of pneumatic ball valve with heat preservation and puts forward improvement measures.
1 Put forward the question that the thermal insulation pneumatic ball valve in the current technical field, also known as jacketed pneumatic ball valve, is welded with a metal jacket on the basis of the pneumatic ball valve. The jacket and the valve body form a thermal insulation channel, in which steam or other thermal insulation media are injected to ensure that the media in the valve can work normally. The thermal insulation pneumatic ball valve has good thermal insulation characteristics, and the valve diameter is consistent with the pipe diameter, while effectively reducing the medium heat loss in the pipeline. It is mainly used in petroleum, chemical, metallurgical, pharmaceutical, food and other systems to transport high viscosity media that will solidify at normal temperature.

Advantages of private customized corrugated pneumatic butterfly valve
Three functions: reduce the device stress of the pipeline, compensate for the displacement of the rated position of the pipeline, and absorb the vibration of the pipeline system. What are the special features of the corrugated pneumatic butterfly valve
1. In order to reduce the number of corrugated sections of bellows, 50% cold drawing shall be considered.
2. Ash baffle: it can not be used for air duct or pipe with little dust, and it should be used for flue with much dust.
3. Maximum allowable shrinkage per wave recommended: full height △ α= ± 24mm half height △ α= ±12mm。
4. The standard half height corrugated pneumatic butterfly valve is applicable to places with a sectional area of less than 4.6 square meters and the overall dimensions of the flue and air duct where one side is less than 1.5 m but more than 0.6 mm. The standard full height corrugated pneumatic butterfly valve is applicable to all flue ducts.