CAA amendment has increased the use of straight travel valve chemical companies, oil refineries and other production companies to use valve in the prevention of leakage of the valve on outside input. CAA and its amendments control the leakage caused by the results of manual valves to automatic valves, control valves, the introduction of new suppliers of technology to the design of the valve to reduce leakage outside the valve. Valve to reduce leakage outside the key material of the valve packing system. Polytetrafluoroethylene (PTFE) and graphite is a two valve system commonly used filler material, in order to reduce the external leakage of the valve, many suppliers will be high-fluorine elastomers and some combination of PTFE and graphite for the valve The filler system. Perfluoro Elastomer high PTFE packing system, packing system than the energy needed to compress, but pressed graphite packing system than high-Perfluoro elastomer good times of high filler system. Compaction force of the General Assembly leading to wear and damage to stem, thereby causing leakage of the valve apart. Generally speaking, the use of rotary valves is to reduce leakage outside of the effective measures that have a rotary valve instead of the implementation of the trend-way valve.
According to Valve Manufacturers Association (Valve Manufacturer Associate VMA) with a market share can also illustrate this trend: According to data provided by VMA, the United States in 1996 ball valve, industrial valves and valve plunger shipment volume (VMA Special Records a ball valve, industrial valves and valve plunger shipment volume, in addition, VMA valve will automatically be tracked as a separate category, there is no single record of 1 / 4 rotary valve sales, but its into this type of automatic valve. VMA provided by the United States the amount of supplier shipment data, including exports but not imports) a total of 1.04 billion U.S. dollars, including the number of manual valves and automatic valves, but does not include valve. Ball the largest percentage, accounting for 54.2% of the total, accounting for 26.2 percent of industrial valves, and the remaining 19.6% share of the plunger valve (see table I).
4 Rotary Valve (1) in the refinery to reconcile the system to reconcile the oil refinery in the system, in order to enhance the quality of harmony, to reconcile the often requested to participate in a variety of precision high-speed of the oil must be injected with the cut, which often require a higher rate of the control valve to cut off so that the flow no matter how much traffic the road will be able to provide accurate mixing of the liquid. Traditional straight trip valve or cut-off valve is no longer to adapt to such refineries in the application of spin valve because of its inherent advantages described above, so that applications can provide more cost-effective. To the user to run a greater long-term gains. (2) Rotary Valve plant in my specific application in a wide range of applications: 4-way radiation coking plant feed control valve rotary valve replaced. Coking workshop designed for the original two-seat valve, as a result of the radiation coking feed containing a large number of coke particles, and temperatures are high, fast flow of control valves have a lot of erosion, control of the spool valve, valve seat soon erosion or bad, serious leakage, can not control, a new control valve can only run for 3 months; later for the control valve of the valve sleeve, the situation has changed, a new control valve will be able to run 5 months. September 1997 we will FISHER control valve for rotating the valve, as a result of rotation with anti-cavitation ability to overcome the effective scouring media, in October 1998 in which we examined a control valve, valve core, valve seats in good condition . Four control valves have been using so far. Specific applications 2: South distillation 3 Furnace Road decompression feed. The original design of vacuum furnace for 3 furnace feed valve sleeve, due to feed containing residue, impurities, control valves are often blocked, and temperatures are high, easy to condensation, to the instrument to maintain a lot of work in June 1998 3 Road FISHER feed for rotating the valve, rotary valve as a result of the flow with strong ability to overcome these problems, operating normally. Specific application 3: catalytic residue control valve back to smelting. Residue catalytic refining control valve back to the original design for the sleeve valve, as a result of smelting residue containing the catalyst back to the serious erosion control valves, control valves can not be normal use, a new control valve into the can run for 6 months, 1998 June will be in control of the rotary valve for FISHER, use so far. Specific application of 4: Catalytic air pressure machine put the torch. Catalytic air pressure machine put the torch using the original gate valve 700, the disadvantage of slow switching speed, leakage, and after a three-eccentric butterfly valve, switching speed of less than 10 seconds, sealing can be achieved 5. So there are many specific applications, to the list.
5 Conclusion The integration of refining and refining device the size of large-scale chemical plant, the production process instrumentation and control system for accuracy and adaptability requirements of increasingly stringent control system as a core component of the implementation of components - control valve, and its performance petrochemical plant and the quality of the economic benefits of the increasing influence. Whether it is the future expansion of production scale in order to improve quality control, or (as the advanced control or optimal control, etc.), have asked us in the selection of control valves, not only to consider the construction period of one-time investment, but also pay attention to the running costs of the production period. With the growing characteristics of rotary valve for people to understand and accept that its bound to be increasing in the domestic large-scale oil refining and chemical devices get more and more widely. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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