The sealing packing and gasket of V-shaped ball valve play a very important role in the entire sealing field, and their function is to prevent the leakage of the sealed medium. In modern industry, due to high temperature, cryogenic, high-pressure, high vacuum, flammable, explosive, highly corrosive, radioactive and other high parameter fluid engineering, any leakage in any part of these systems can cause serious harm. Therefore, it is required that the material of the sealing packing and gasket of the V-shaped ball valve be heat-resistant, corrosion-resistant, have good sealing performance, and have certain elasticity, plasticity, and sufficient strength at working temperature.

Sealing fillers and gaskets mainly made of asbestos fibers have good heat resistance, corrosion resistance, and chemical stability when used in media such as water, steam, and oil, and are inexpensive, making them widely used in fluid devices. But with the increasing development of science and technology, people have found that asbestos materials are harmful to human health and are one of the most carcinogenic substances, which has been confirmed by the World Health Organization. As a raw material for fluid sealing products, especially for sealing parts directly related to food, such as food, beverages, alcohol, etc., it is not advisable. Therefore, internationally, especially in some developed countries, it has been legally prohibited to produce and use sealing products made of asbestos. At the same time, flexible graphite and asbestos free sealing fillers and gaskets were selected and recommended as the main materials to replace asbestos fibers.

This type of packing gasket not only has strong chemical stability, good compression resilience, good thermal conductivity and self-lubricating performance, but also is resistant to high and low temperatures, with a compressive strength of over 20Mpa. According to its technical performance and practical application effect, it is a new type of V-shaped ball valve sealing material with broad development prospects. It has profound significance in terms of practical substitution effect, protection of human health, and economic benefits.