As a kind of valve used to achieve the open-close and flow control of pipeline system, soft sealing wafer butterfly valve has been widely used in many fields such as petroleum, chemical, metallurgy and hydropower.
For butterfly valve technology, the sealing form is mostly sealed, and the sealing material is rubber, polytetrafluoroethylene and kind of that etc. Due to structural limitations, soft sealing butterfly valve is not suitable for field such as high temperature, high pressure,and wear resistance.
How to choose properly material for soft sealing butterfly valve ?
The disc material of the soft sealing butterfly valve are avalaible such as nylon coated disc, galvanized coated disc, CF8 ( SS304 ) disc, CF8M ( SS316) disc, etc. The choice of the valve disc is determined according to the medium of the customer's pipeline. Generally, if it's not corrosive, the galvanized plate is ok. for corrosive service we can choose 304 or 316 disc, also can choose nylon coated disc.
The sealing seat of the soft seated butterfly valve include NBR rubber, EPDM rubber and Viton rubber. The temperature resistance of NBR and EPDM is about 80 degrees C, and the Max. temperature resistance of Viton rubber is about 150 degrees C. Also the NBR rubber is oil resistant, EPDM rubber is resistant to aging, and Viton rubber is resistant to weak-corrosion
Zhejiang Zhengfeng Valve.