The hottest foreign valve products are developing

Foreign valve products are developing towards large-scale and automation

with the development of foreign large-scale complete sets of technology, a series of new complete sets of equipment and single machines have emerged. The development of new complete sets of equipment related to valves is characterized by large-scale, high parameter, high-performance automation and complete sets, which are suitable for the control mode of these complete sets of equipment. In the past 20 years, the control methods of valves abroad have also developed greatly. In addition to the general manual, motorized, electric, pneumatic and hydraulic transmission, the varieties of electro-hydraulic linkage, gas-liquid linkage and automatic control valves are increasing, and there is a trend of further development

such as oil refining equipment. The largest refinery is 36.4 million tons/year (Virgin Islands in the Caribbean), and 30million tons/year (Venezuela). At present, there are nearly 30 refineries with more than 20million tons/year; The treatment of the pressure reducing device of the largest unit refining can be applied to valve springs, plunger springs, etc; The electro-hydraulic servo spring fatigue testing machine is expensive, with the force reaching 24million tons/year, the catalytic cracking unit reaching 8.24 million tons/year, and the hydrocracking unit reaching 3.2 million tons/year. The large-scale device has forced the valve to become larger and larger, and the control mode has also begun to develop in the direction of automation

in recent years, long-distance pipelines have developed rapidly. The main reasons are: first, financing is difficult and the cost is low, which is only equivalent to 1/3 of railway transportation; Second, it is buried underground and not easy to be damaged; Third, the pipeline construction speed is fast and the investment is low. Therefore, the demand for valves for long-distance pipelines has increased significantly in recent years. The maximum unit capacity of power generation equipment is 1.3 million KW for double shaft thermal power units, 1.2 million KW for single shaft thermal power units, and 1.3 million KW for the largest nuclear power units

among the valves matched with these complete sets of equipment, the diameter of the largest flat gate valve reaches 1620mm and 2000mm; The maximum diameter of butterfly valve is 9750mm; The maximum diameter of the ball valve is 3050mm, and the weight of the valve, excluding the driving device, reaches 184 tons; The maximum diameter of gate valve for water is 2750mm, and the pressure reaches 9Mpa

the economic effect of large-scale equipment can be summarized as follows: first, improve production efficiency, second, reduce infrastructure investment, and third, reduce the consumption of raw and fuel materials. Compared with 1million tons of oil refining equipment with an annual processing capacity of 5million tons, the investment in production capacity per ton of products is reduced by 50%. Compared with the two 3million ton/year refineries, the investment of a 6million ton/year refinery is only 69% of the latter, the steel consumption is 53%, the floor area is 54%, the production cost is 75%, and the labor productivity is increased to 170%

due to the increasing automation level of complete sets of equipment, the main production processes of foreign petrochemical enterprises have achieved direct digital control, and some have also achieved computer hierarchical control. Chemical enterprises such as synthetic ammonia, ethylene, urea, synthetic fiber, synthetic rubber and synthetic plastics generally realize patrol inspection and alarm, and some enterprises have achieved partial automatic control

at present, large generator sets with more than 200000 kW abroad are generally developing towards computer control; Nuclear power plants are generally controlled by computers; In many countries, long-distance pipeline systems are controlled by computers and equipped with microwave communication systems. Only twoorthree personnel on duty are needed in the general control room, and the working conditions of the whole line can be monitored by television

with the improvement of process and performance, the series of foreign valves are still increasing, and many new varieties of valves have appeared in recent years. Such as: emergency shut-off valve, quick on-off valve, fire damper, anti-static theoretical guidance and practice valve, temperature and pressure reduction valve, butterfly check valve, pressure relief valve, vacuum jacketed valve, water-cooled or air-cooled valve, safety gate valve, safety stop valve and other new valves, among which ball valve, butterfly valve and flat gate valve are the fastest-growing valve varieties in the past 20 years