There are about 2,300 valves produced in China, and there are several types of valve products available, more than 3,500 varieties and more than 40,000 specifications.
(1) Valves for urban construction: The urban construction department generally adopts low-pressure valves and is currently developing in the direction of environmental protection and energy conservation. Environmentally friendly rubber plate valves, balancing valves, and mid-line butterfly valves and metal-sealed butterfly valves are gradually replacing low-pressure iron gate valves. Most of the valves used in urban construction in the country are balance valves, soft seal gate valves, butterfly valves, etc.
(2) Valves for urban heating: In the urban heat generation system, a large number of metal sealing butterfly valves, horizontal balancing valves and direct-buried ball valves are needed. Because of this type of valve, the longitudinal and lateral hydraulic imbalance of the pipeline can be solved to achieve energy saving and heat balance. the goal of.
(3) Valves for environmental protection: In the domestic environmental protection system, the water supply system mainly needs the middle line butterfly valve, the soft seal gate valve, the ball valve, and the exhaust valve (used to remove the air in the pipeline). Sewage treatment systems mainly require soft sealing 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 there are many types. Ball valves, plug valves, pressure reducing valves, and safety valves are mainly required.
(5) Valves for long-distance pipelines: Long-distance pipelines are mainly crude oil, finished products and natural pipelines. The valves that require a large amount of such pipelines are forged steel three-piece full-bore ball valves, sulfur-resistant slab gate valves, safety valves, and check valves.
(6) Valves for petrochemical plants: a, oil refining devices, valves used in refining devices are mostly pipeline valves, mainly gate valves, globe valves, check valves, safety valves, ball valves, butterfly valves, steam traps, among them, gate valve demand It accounts for about 80% of the total number of valves (valves account for 3% to 5% of the total investment of the plant). b. Chemical fiber equipment, chemical fiber products mainly include polyester, acrylic and vinylon. Ball valve and jacketed valve (jacketed ball valve, jacketed gate valve, jacketed shut-off valve) for the valve to be used. c, acrylonitrile device. The device generally needs to use the valve produced by the api scale, mainly for the gate valve, the stop valve, the check valve, the ball valve, the trap, the needle valve, the plug valve, wherein the gate valve accounts for about 75% of the total valve. d, ammonia plant. Because the synthesis of ammonia and purification methods are different, the process flow is different, and the technical functions of the required valves are also different. At present, domestic ammonia plants mainly need gate valves, globe valves, check valves, traps, butterfly valves, ball valves, diaphragm valves, regulating valves, needle valves, safety valves, and high temperature cryogenic valves.
Among them, the shut-off valve accounts for 53.4% ​​of the total valve data of the device, the gate valve accounts for 25.1%, the trap accounts for 7.7%, the safety valve accounts for 2.4%, the regulating valve and the cryogenic valve and other 11.4%.e, ethylene device, ethylene device It is a leading device for petrochemical industry, which requires a wide variety of valves.
Gate valves, globe valves, check valves, and lift-rod ball valves account for the majority, with gate valves needing to take the lead. In the "10th Five-Year Plan", there are still 6 sets of ethylene plants with an annual output of 660,000 tons, and the demand for valves is considerable. In addition, large-scale ethylene and high-pressure polyethylene devices require ultra-high temperature, lower temperature and ultra-high pressure valve series. f, air separation device. "Air separation" means air separation. The device mainly requires a shut-off valve, a safety valve, a check valve, a regulating valve, a ball valve, a butterfly valve, and a cryogenic valve. g, polypropylene device, polypropylene is easy to use propylene as raw material, polymerized polymer compound, the device mainly needs 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 the direction of large-scale development. Therefore, large-diameter and high-pressure safety valves, pressure reducing valves, globe valves, gate valves, butterfly valves, emergency blocking valves, flow control valves, and spherical seals are required. Instrument shut-off valve, (According to the national “Tenth Five-Year Planâ€, except for the provinces of Inner Mongolia and Guizhou, which can build more than 200,000 kilowatts, other provinces and cities can only build units of more than 300,000 kilowatts).
(8) Valves for metallurgy: The behavior of alumina in the metallurgical industry mainly requires the use of wear-resistant slurry valves (in the flow-type shut-off valve) and the adjustment of the trap. The steelmaking industry mainly needs metal sealed ball valves, butterfly valves and oxidized ball valves, cut-off flash and four-way reversing valves.
(9) Applicable valves for marine flats: Following the development of offshore oilfield exploitation, the amount of valves required for marine flat hair is gradually increasing. Offshore valves, check valves, and multi-way valves are required for offshore platforms.
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