Describe briefly how many types of valves in our country

China's valve production of three more than about 2300, can provide several major categories of valve products, more than 3,500 varieties, more than 40,000 specifications.

(1) Valves for Urban Construction: The Urban Construction Department is generally using low-pressure valves and is currently developing toward environmental protection and energy conservation. Environmental-friendly rubber sheet valves, balance valves, and midline butterfly valves and metal sealing butterfly valves are gradually replacing low-pressure iron gate valves. The most commonly used valves in urban construction in China are balance valves, soft-sealed gate valves, and butterfly valves.

(2) Valves for Urban Heating: In the urban heat generation system, a large number of metal sealing butterfly valves, horizontal balancing valves, and buried ball valves are needed. This type of valve solves the problem of longitudinal and lateral hydraulic imbalance in the pipeline and achieves energy conservation and heat balance. the goal of.

(3) Environmental protection valve: In the domestic environmental protection system, the water supply system mainly needs the middle line butterfly valve, soft seal gate valve, ball valve, and exhaust valve (used to exclude the air in the pipeline). Sewage treatment systems mainly require soft-sealed gate valves and butterfly valves.

(4) Valves for city gas: City gas accounts for 22% of the entire natural market, and the amount of valves is large, and its types are also numerous. The main need for ball valves, plug valves, pressure relief valves, safety valves.

(5) Valves for long-distance pipelines: Long-distance pipelines are mainly crude oil, finished products, and natural pipelines. The valves that require the majority of these pipelines are forged steel three-body full-diameter ball valves, sulfur-resistant flat gate valves, safety valves, and check valves.

(6) Valves for petrochemical plants: a. Refining units. Most of the valves required for oil refineries are pipeline valves. They are mainly gate valves, globe valves, check valves, safety valves, ball valves, butterfly valves, and steam traps. About 80% of the total number of valves, (valve accounts for 3% to 5% of the total investment in the device). b. Chemical fiber equipment, chemical fiber products are mainly polyester, acrylic, vinylon three major categories. The valve ball valve and jacket valve (jacketed ball valve, jacketed gate valve, jacketed globe valve) are required for the valve. c, propylene clear device. The device generally requires the use of api-scale valves, mainly gate valves, globe valves, check valves, ball valves, traps, needle valves, and plug valves. Among them, gate valves account for about 75% of the total number of valves. d, ammonia equipment. Because the synthesis ammonia is different from the purification method and its process flow is different, the technical capabilities of the required valves are also different. At present, domestic ammonia synthesis plants mainly use gate valves, globe valves, check valves, traps, butterfly valves, ball valves, diaphragm valves, regulating valves, needle valves, safety valves, and high-temperature and low-temperature valves.

Among them, the cut-off valve accounted for 53.4% ​​of the total data of the valve for the device, the gate valve accounted for 25.1%, the steam trap accounted for 7.7%, the safety valve accounted for 2.4%, the control valve and the cryogenic valve and others accounted for 11.4%. e. Ethylene plant, ethylene plant is a leading petrochemical plant, which requires a wide variety of valves.

Gate valves, globe valves, check valves, and lifter ball valves account for the majority of them, among which the gate valves must be ranked first. In the “Tenth Five-Year Plan”, six sets of ethylene plants with an annual output of 660,000 tons are needed in the country, and the demand for their valves is considerable. In addition, large-scale ethylene and high-pressure polyethylene devices also need ultra-high temperature, low temperature and ultra-high pressure valve products. f. Air separation device. "Air separation" means air separation. The device mainly needs stop valves, safety valves, check valves, regulating valves, ball valves, butterfly valves and cryogenic valves. g, polypropylene device, polypropylene is easy to use propylene as raw material, polymer compound made of polymer, the device mainly requires gate valve, globe valve, check valve, needle valve, ball valve, trap.

(7) Valves for power stations: The construction of power stations in China is developing in a large-scale direction, so large-diameter and high-pressure safety valves, pressure reducing valves, globe valves, gate valves, butterfly valves, emergency block valves and flow control valves, spherical seals are required. Instrument cut-off valve, (according to the National "Tenth Five-Year Plan", except for the Inner Mongolia, Guizhou provinces can also build more than 200,000 kilowatts of units, other provinces and cities can only build more than 300,000 kilowatts of units).

(8) Valves for metallurgy: The alumina behavior in the metallurgical industry mainly requires the use of wear-resistant slurry valves (in the flow stop valve) and adjustment of the trap. The steel-making industry mainly needs to use metal sealed ball valves, butterfly valves and oxidation ball valves, stop flashes and four-way reversing valves.

(9) Marine Valves: Following the development of offshore oilfields, the amount of valves required for marine flatfish production has also gradually increased. Marine platforms need to shut off ball valves, check valves, and multi-way valves.