LNG involves cryogenic fluid process control of the valve series and multiphase flow control process, also is at present the design and calculation is complex, processing and manufacturing of low temperature process control difficult equipment, there is no uniform design calculation method, calculation need recheck computation in the process of low temperature material strength, choose the gas-liquid two-phase flow parameters, etc. , as the process or larger difference among different physical parameters characteristics, it is difficult to standardization. In addition, due to the LNG series valve sort is more, there is no unified model of structure design and theoretical design and calculation method for computer aided calculation process, brought scientific computing process of LNG series valve dysfunction. Since the 1980 s, major foreign tyco companies such as development, can control the process of LNG under low temperature condition, etc. , has a good control effect and high intensive degree, less number of valves etc. In domestic LNG liquefaction plants, LNG terminal and LNG gasification station existing applications, generally with the whole process of complete sets of imported. Lanzhou jiaotong university and gansu, cosco has - energy power engineering co. , LTD LNG series valves, - 162 ℃ With series valves, - 70 ℃ low temperature methanol Liquid nitrogen series valves, - 197 ℃ 210 ℃ space flight for series valve and so on the series development, mainly aimed at to - LNG series of plate-fin heat exchanger, - 162 ℃ 162 ℃ LNG series winding pipe heat exchanger as LNG liquefaction equipment mainly supporting system with cryogenic valves for development, according to the different temperature and control field, the study of different kinds of cryogenic valves design calculation method. The book on - 162 ℃ LNG series valve structure characteristics, the research and development of LNG LNG LNG butterfly valve, gate valve, globe valve, LNG LNG relief valve check valve, LNG ball valve, control valve, etc. Various types of LNG has the industrialization design and manufacture ability.

the liquefied natural gas (LNG) equipment design technology & ndash; LNG cryogenic valves volume 'collect zhou-wei zhang, ya-hong wang led research and development of low temperature process control 12 general valve, mainly including LNG LNG gate valve, ball valve, butterfly valve, LNG and LNG valve, LNG LNG LNG safety Industrial Valves, throttle valve, relief valve, LNG LNG needle valve, check valve, LNG LNG temperature control valve, the respiration valve, the LNG 12 categories, drain valve is mainly used in - 162 ℃ LNG sector, involving 12 classes of low temperature process control valves and equipment research and development technology, containing cryogenic refrigeration basic research and product design process. Research and development products can be applied to liquefied natural gas (LNG), petroleum chemical industry, coal chemical industry, air liquefaction and separation, refrigeration and cryogenic engineering, etc.

this book is divided into 13 chapters, among them, 1 ~ 5 chapter, chapter 9 mainly involves LNG process control switch type valves research and industrialization of content, mainly including LNG butterfly valve, LNG LNG LNG cut-off valve, gate valve, ball valve, LNG 5 kind of cryogenic valves, check valve is mainly used in - 162 ℃ LNG liquefaction and storage and transportation field, connected in general to LNG pipeline process control, switch the role of fluid in low temperature. Due to all kinds of valves with different structure characteristics, can be used in different working conditions of LNG liquefaction and storage and transportation system.

listed in chapter 6, chapter 8 r&d products are mainly involved in LNG LNG safety valve, relief valve, the main connection on the LNG vacuum container or LNG pipeline, LNG valve main relief role, according to different step-down indicators, reduce pressure in the LNG system or pipeline. LNG relief valve is mainly used in LNG liquefaction and storage and transportation system, the main safety relief role.

chapter 7 mainly involves LNG throttle valve, mainly used in LNG liquefaction unit open LNG liquefaction process, but the throttle gas, reduce the gas temperature, or applied in the process of LNG liquefaction unit closed, according to the request of throttling temperature throttle mixed refrigerant, can be used as a level 4 throttle valve. LNG is the main purpose of throttle valve throttle mixed refrigerant and generate the throttling refrigeration effect, make the gas temperature is reduced to - 162 ℃ and liquefaction, throttle refrigeration effect.

chapter 10 mainly involves the LNG needle valve, can be used to accurately adjust the LNG flow, make the LNG liquefaction or pipe flow to achieve precise adjustment and transport functions.

chapter 11 is mainly involved in LNG breathing valve, pressure balance control is mainly used for LNG system.

chapter 12 mainly involves the LNG temperature control valve, mainly used in LNG liquefaction process, control temperature LNG liquefaction system or LNG transport system.

listed in chapter 13 developed products are mainly involved in LNG drain valve is mainly used in LNG storage and transportation system, but separation of LNG gas liquid two phase flow, will be saturated or overheating of LNG transport fluid gas liquid two phase separation.

the above LNG valve series of LNG liquefaction technology is difficult in the process of LNG series product research and development projects, process control and equipment is mainly used in liquefied natural gas ( LNG） And low temperature refrigeration, refrigeration, coal chemical industry, petrochemical industry, space equipment manufacturing and other fields. LNG based research and development of the valve series and design and manufacturing technology has been mature, from the design and manufacture of equipment, which has been applied in the LNG can process system, and promote the LNG series of nationalization and industrialization of the process control and equipment.

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