Pneumatic butterfly valve has the advantages of simple structure, small flow resistance coefficient, straight flow characteristics, and can be used for cutting and regulating. The air consumption of pneumatic butterfly valve is proportional to the valve diameter and cylinder diameter. The larger the cylinder, the more air consumption, and the longer the switching time. The air consumption corresponding to the cylinder is listed below.

Characteristics of PTFE compensator with lining and selection of hose
The lining PTFE expansion joint is also called lining PTFE corrugated contraction joint. The outer body is a stainless steel metal compensator. There is a layer of plastic type information inside the corrugated. The lining PTFE is mainly used to compensate the displacement of the medium in the pipeline due to temperature changes. The lining PTFE is used to resist high strength corrosion, namely, concentrated acid, concentrated alkali, concentrated salt and other media, Avoid leakage and damage of expansion joint due to medium corrosion, which is mostly applicable to pipelines in chemical industry. Therefore, the characteristics of the lining PTFE expansion joint are as follows:
1、 High strength corrosion resistance, good sealing performance, long service life and cost saving.
2、 It is used to eliminate thermal contraction joints or displacement caused by temperature change of pipeline equipment.
3、 It is used to absorb the deviation of design and practice devices, and the tetrafluoro compensator makes the pipeline work normally.
4、 It has the advantages of noise elimination, vibration reduction and fear of impact,