The development of high-temperature pneumatic ball valve focuses on the following aspects: improving the temperature limit of pneumatic ball valve; Increase the pressure limit of pneumatic ball valve; Make the pneumatic ball valve have good throttling performance; Make the pneumatic ball valve have good corrosion resistance to solid particles, cavitation and blowout; The pneumatic ball valve has excellent cut-off capacity.

Understand the selection of the contraction joint and its support of the tetrafluoro compensator
The support design in the pipeline system is a necessary condition to ensure the normal functioning of the bellows contraction joint. Different types of bellows contraction joints have different requirements for the support of the pipeline system. Classification of supports in bellows contraction joint system: primary fixed support, secondary fixed support and guide support.
1. Main Anchor
The main fixed support is installed on the pipe system with one or several unconstrained bellows contraction joints. It must accept the force and moment exerted on it by each pipe section connected with it. For example, the pressure thrust (blind plate force) generated by the medium pressure in the pipeline, the force and torque required to make the bellows shrink joint produce the amount of positioning displacement, and the friction force generated by the adjustable guide support, the guide guide to the support, as well as the weight of pipeline and medium, fluid impact force, etc.
When the unconstrained wave spinning tube contraction joint is selected in, the main fixed support must be set under the following conditions:
1) Pipe blind end
2) Change of medium flow direction
3) Pipeline branch
4) Pipe reducer
5) At the stop valve or pressure reducing valve on the pipeline between two bellows contraction joints.
2. Secondary fixing bracket (I anchor)
The secondary fixed support is used to accept all loads except the pressure thrust (blind plate force).