欧美成人毛片在线视频-欧美成人猛男性色生活-欧美成人免费-欧美成人免费sss-99视频在线观看视频一区-99视频在线国产

As the control part of the fluid conveying system, the valve has the functions of cut-off, regulation, flow diversion, countercurrent prevention, diversion and pressure relief. There are many kinds and various specifications.With the continuous development of valve technology, the application field of valves is also expanding, and the demand for high-end valves is expanding, which is not only a period of innovation and development in the valve industry, but also a period to meet the challenges. China's valve manufacturing industry after years of development, in the valve production and technology research and development, has made great progress, some enterprises and products have made good achievements, but the development and production capacity of high-end valve

The sealing surface is the key working surface of the valve, the quality of the sealing surface directly affects the service life of the valve, and the material of the sealing surface is an important factor to ensure the quality of the sealing surface.Therefore, the following factors should be considered when selecting the sealing surface material of the valve: 1.Corrosion resistance."Corrosion" refers to the process in which the sealing surface is damaged under the action of the medium.If the surface is damaged in this way, the tightness cannot be guaranteed, and therefore the sealing surface material must be resistant to corrosion.The corrosion resistance of the material mainly depends on its chemical stability. 2.Scratch-resistant."Scratch" refers to the damage cau

In recent years, with the large-scale development and utilization of natural gas resources in China, the consumption of natural gas has increased greatly in the fields of power generation, civil use, transportation and chemical industry.In addition, countries attach more importance to the green and low-carbon economy, the development of natural gas has jumped to a new level. Natural Gas Industry 'resilient' in 2020 "The term 'resilient' can be used to describe the gas industry in 2020.Even if encounter COVID - 19 outbreak this year, oil prices plunged, clean heating policy shift, and many other "black swans" or adverse effect, in other industries to present type down the precipice, the natural gas market demand still maintain a certain growth rate, shows that the natural

After entering winter, the temperature drops rapidly, the valve often appears the situation of freezing.If left untreated at this point, the pipeline is vulnerable to failure.If it is in some high-risk conditions, accidents may occur.Therefore, the anti-freeze treatment of the valve is very important. Before the temperature drops, it is necessary to carry out a comprehensive insulation work on the valve device to make "winter preparation". Get the tools you need: thermal cotton, wire, pliers, box cutter, and a valid gas alarm in the gas area. Use a box cutter to cut the appropriate insulation cotton to the size of the valve.Use pliers to cut the wire for binding.When wrapping the insulated cotton, tear the insulated cotton slightly so that

The electric explosion-proof ball valve has the characteristics of simple structure, quick switching, large flow capacity, zero leakage and so on. It is suitable for the occasions of high viscosity, containing fiber and solid particle fluid.Electric explosion-proof ball valve is widely used in petrochemical industry, metallurgy, light industry and other industrial automatic control field to cut off or flow of gas, liquid transmission pipeline intermediary. The function of electric explosion-proof ball valve Electric explosion-proof ball valve explosion-proof grade for Exd Ⅱ BT4, protection grade for IP67, field control devices.The main features of the explosion-proof electric ball valve are: when the power is not on, pull the clutch handle for manual operation.When powered on,