The thermal insulation performance of valves has an important impact on the normal operation of the whole pipeline and the exertion of economic benefits. What is the impact of thermal insulation pneumatic ball valves on the operation of equipment? This paper analyzes the specific impact from four aspects: the impact of thermal alternation, the impact of corrosion on exposed valves, the impact of thermal expansion difference, and the impact of thermal expansion difference between flanges and bolts.

304 pneumatic butterfly valves are widely used in asphalt plants
The petrochemical asphalt plant uses a large number of 304 pneumatic butterfly valve assembly series with high requirements all year round. The first petroleum asphalt futures in the world has won the favor of investors on the first day of listing, and the first batch of listed contracts have been widely opened. Among them, the main Bu1402 contract rose rapidly by 3% at the opening, but it opened high and went low all day, closing at 4476 yuan/ton, up 0.4%. The trading volume was very lively, with a total trading volume of nearly 320000 hands and a position of 65246 hands. The debut was a good start. In addition, the overall turnover of all contracts exceeded 340000, and the total position reached 70000. As one of the types of crude oil industry chain, asphalt plays an indispensable role in the development of the national economy.
As the downstream product of crude oil, asphalt not only has the commonality of energy bulk commodities led by crude oil, but also is greatly affected by the investment in basic equipment construction and road construction planning, with great seasonal and regional differences. Therefore, the price of asphalt is not only affected by the price of crude oil, but also has its own volatility.
Secondly, increasing asphalt production is the first choice of low-cost and convenient marketing plan for processing heavy and high sulfur crude oil, and is also a smart way for oil refining enterprises to adjust product structure, so asphalt is increasingly becoming a special product with added value. Although the supply exceeds the demand, the factory operation rate is high. Finally, in the near future, the downstream project has a great pressure on funds, and the difficulty in returning the pledged funds has hindered the traders from replenishing. Since the winter storage last year, the domestic asphalt price has declined steadily. The spot quotation of asphalt in East China market is concentrated at about 4500 yuan per ton. In addition to the recent seasonal decline of crude oil, the future trend is weak.
The listing of petroleum asphalt futures will play a leading role in the future listing of crude oil futures, and accumulate experience for the promotion of domestic oil price marketization and the introduction of oil series futures types in China's energy futures market. Through the arbitrage mechanism of the domestic futures market and the international market, the international oil price is affected, and the demand factors of our country are correctly reflected in the trend of price fluctuation in the international market. This has an important role in China's fight for the international oil pricing right. At the same time, the cooperation with the strategic oil storage will greatly improve our ability to deal with the risk of price fluctuation and ensure energy security.