The control valve is widely used in oil refining and chemical industry. It is used to control the flow rate, pressure and liquid level of the fluid in the production process.In the application of control valves, calculation and selection is the premise, installation and debugging is the key, use and maintenance is the purpose.If the selection of the control valve is not appropriate, improper installation or debugging is not good, it will not play a regulating role.Therefore, it is very important to be familiar with the control valve working principle and maintenance skills. Principle of control valve Pneumatic control valve to compressed air as power source, through the cylinder, film as the actuator, and with the help of electrical valve positioner, converter, solenoid val

Working condition of high temperature including high temperature, high temperature Ⅰ Ⅱ, high temperature, high temperature Ⅲ Ⅳ, high temperature, high temperature Ⅴ level, the following were introduced. 1, Sub-high temperature Sub-high temperature refers to the valve operating temperature in the 325 ~ 425℃ region.If the medium is water and steam, mainly use WCB, WCC, A105, WC6 and WC9.If the medium is sulfur-containing oil, mainly with anti-sulfide corrosion of C5, CF8, CF3, CF8M and CF3M, etc.They are commonly used in oil refinery atmospheric and vacuum units and delayed coking units. At this time, the valves made of CF8, CF8M, CF3 and CF3M are not used for corrosion of acid resistant solutions, but for sulfur- containing oil and gas pipelines.In this working c

The consensus in the industry is that the market environment has indeed changed profoundly.The industry generally believes that due to the increasingly saturated urban sewage, the future of China's sewage treatment in the main battlefield in the countryside.For the rural sewage treatment market, urbanization will drive the construction of a number of thousand-ton scale sewage treatment plants.Even considering the factors of rural population reduction caused by the increase of urbanization rate, the construction and operation of rural sewage treatment facilities in China can still reach the level of one trillion.According to the estimation of E20 Research Institute, the market space of rural sewage treatment is estimated to be 120 billion yuan after the "13th Five-Year" p

Under the goal of achieving carbon peak before 2030 and carbon neutral before 2060, how to promote the construction of the national carbon emission rights trading market (referred to as the "national carbon market") in the opening year of the 14th Five-Year Plan and complete the related targets of carbon emission reduction on schedule has become a hot topic in this year's NPC and CPPCC. The Ministry of Ecology and Environment has announced that the construction of a national carbon market has reached the most critical stage to ensure that online trading will start before the end of June this year.The representative members suggested speeding up the construction of the national carbon market system, optimizing the carbon trading mechanism, and promoting the hierarchical development

Manual valve is a valve operated by handle and handwheel. It is a common valve used in equipment pipeline.Its handle, hand wheel rotation direction clockwise is closed, counterclockwise is open.However, there are individual valves that open in the opposite way.Therefore, attention should be paid to check the open and close mark before operation.。The handwheel and handle on the valve are designed according to normal manpower. Therefore, in the use of the valve, the operator is not allowed to open or close the valve with the help of a lever and a long wrench.Handwheel, handle diameter (length) 320mm handwheel, allow two people to operate together, or allow one person to use the appropriate lever (generally not more than 0. 5m long) to operate the valve. G

Pre-maintenance of new valves before operation is a progressive construction concept to protect valve seat seals from seat damage during installation, welding and commissioning.The pre-maintenance of the valve before it is put into use can make it better realize the functions of conduction, truncation and diversion. It is not only conducive to early detection of problems, timely troubleshooting, eliminating hidden dangers, but also to extend the operation period of the pipeline, which can better provide a basis for the operation and maintenance of the valve after it is put into operation. The valve leakage mostly occurs in the early use, the main reason is in the pipeline construction operation is not standard caused by the sealing ring and valve ball scratches, these scra

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 product

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 caused by

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 g

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 it goes around the va

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,

Recently, the market supervision administration website announcement, to further standardize the approval of special equipment inspection institutions work, promote reform of special equipment inspection and special equipment administrative license reform, market supervision administration organization drafted the "special equipment inspection institutions approved rules (draft)" (see annex), is to solicit opinions from the public, the deadline for feedback on December 15, 2020. In order to further standardize the approval work of special equipment inspection institutions, promote the reform of special equipment inspection work and the reform of special equipment administrative license, the Bureau has organized the drafting of the "Rules for Approval of Special Equipmen

The arrow on the body indicates the recommended pressure direction of the valve, not the direction of medium flow.Valves with a two-way seal can be either unmarked or marked with an arrow, as the valve arrow indicates the recommended direction of pressure, left or right or up or down, one of which is always better. The arrow direction marked on the valve body indicates the pressure direction of the valve, which is usually marked by the engineering installation company as the medium flow direction, resulting in leakage or even pipeline accidents due to incorrect installation. Pressure direction refers to the valve used in the closed state of the pipeline working condition, the arrow direction of the valve body is recommended to bear the pressure, if the wrong installation, th

"Master Huang, your special tool for air valve is so easy to use. I am replacing a valve plate and buffer plate now. It only takes 5 minutes." On November 12th, after replacing the valve plate and buffer plate of a gas valve of no. 4 compressor, Ma Huomin, a staff member in the first station of the oil and gas transportation and Marketing Department of the northwest oil field, said excitedly to The stationmaster Gold. "I'm glad you're doing your work more efficiently."Gold stroked the new tool as if it were her own child.Not long ago, they struggled to replace the compressor valves and buffers. It turned out that when replacing the compressor valve plate and buffer plate, the air valve needed to be fixed on the bench vise, and it took two people an hour to take the

To be able to use pneumatic ball valves well we need to be able to maintain the equipment well.It is also a very complicated job to maintain the equipment.It's a lot of work, but we need to be able to do it well in order to be able to run these devices efficiently.However, if we want to be able to maintain these devices well, we need to be able to make sure that we know how to perform the daily maintenance of these devices. A lot of people don't have a clear idea of how to maintain the equipment when they use it.This must be extremely disadvantageous to our use of equipment.Because you can't maintain the equipment, you can't protect the efficiency of the equipment.In the long period of use, it will definitely affect the overall production efficiency.Therefore, it is very i