High temperature under the condition of pneumatic valve material how to choose

working condition of high temperature including high temperature, high temperature Ⅰ Ⅱ, high temperature, high temperature Ⅲ Ⅳ, high temperature, high temperature Ⅴ level, the following were introduced.
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the high temperature and high temperature refers to the working temperature of pneumatic valve in ~ ℃ area. If the medium is water and steam, mainly use WCB, WCC, A, WC and WC. If the medium is oil, sulfur mainly use C with sulfide corrosion resistant, CF, CF, CFM and CFM. They use of crude distillation unit and delayed coking unit in the refinery, the CF, CFM, CF and CFM material pneumatic valve is not used in corrosion resistance to acid solution, but for sulfur oil and oil and gas pipeline. In this condition, CF, CFM, CF and the highest working temperature limit for CFM ℃.
level, high temperature Ⅰ
the working temperature of pneumatic valve for high temperature Ⅰ level (~ ℃ for Hereinafter referred to as PI. Grade PI pneumatic valve body material as the CF ASTMA standard as the fundamental form of 'high temperature Ⅰ class in carbon chromium nickel titanium rare earth high quality heat resistant steel'. As PI level is a specific name, contains high temperature stainless steel (here The concept of P. Therefore, if the working medium is water or steam, although high temperature steel WC (can be used T ℃ or less or WC ( T ℃ or less, although high temperature can be used when product sulfur steel C ( ZGCrMo, but here can't call them to PI.
pneumatic valve, high temperature Ⅱ
the working temperature for ~ ℃, as the high temperature Ⅱ level ( Referred to as P Ⅱ level. P Ⅱ level high temperature heavy oil catalytic cracking unit of pneumatic valve is mainly used in oil refinery, it contains three rotating nozzle used in lining of parts such as high temperature wear resistance brake pneumatic valve. P grade Ⅱ pneumatic valve body material as the CF ASTMA standard as the fundamental form of 'high temperature level Ⅱ carbon chromium nickel and rare earth, titanium in tantalum type heat resistant steel'.
pneumatic valve, high temperature Ⅲ
the working temperature for ~ ℃, as the high temperature Ⅲ level ( Referred to as P Ⅲ level. P Ⅲ level high temperature pneumatic valves are mainly used on large heavy oil catalytic cracking unit in the refinery. P level Ⅲ high-temperature pneumatic valve body for the CFM ASTMA standard as the fundamental form of 'high temperature Ⅲ carbon chromium nickel molybdenum in rare earth, titanium tantalum enhanced heat resistant steel'.
pneumatic valve, high temperature Ⅳ
the working temperature for ~ ℃, as the high temperature Ⅳ level ( Referred to as P Ⅳ level. The P level Ⅳ pneumatic valve operating temperature limit as ℃ because the standard ASMEB pressure pneumatic valve design is chosen Offer a maximum temperature of ℃ temperature rating ( υ。 In addition, after more than ℃ temperature work, steel is close to enter the forging temperature region, the metal in the plastic deformation range, metal plasticity is good, hard to work under high pressure and impact force and deformation. P Ⅳ level in the body of the pneumatic valve material for ASTMA standard CFM as fundamental form 'high temperature Ⅳ carbon chromium nickel molybdenum in rare earth, titanium tantalum enhanced heat resistant steel'. CK - And ASTMA standards in F ( The content of C p %, FH heat-resistant stainless steel, etc.
level, high temperature Ⅴ
pneumatic valve working temperature & gt; ℃ above, high temperature levels for short Ⅴ P, P Ⅴ pneumatic valves ( Be cut off by pneumatic valve, rather than the external regulation pneumatic valve of pneumatic butterfly valve must be the use of special design method, such as lining insulation lining or water or air cooling, etc. , can guarantee the normal work of the pneumatic valve. So, level of P Ⅴ high temperature pneumatic valve operating temperature limit does not make the rules, this is because the working temperature of the pneumatic control valve is not only material, but with the special design method to solve, and the basic principle of design method is the same. P Ⅴ level high temperature pneumatic valves according to the pressure of work and working medium and the special design methods and so on, choose reasonable, can satisfy the pneumatic valve material. In P Ⅴ scale high temperature pneumatic valve, normally the flue flashboard pneumatic butterfly valve or pneumatic valve to the board or the butterfly plate the HK - often choose ASTMA standard 香港- High temperature alloy, they can under ℃ oxidation and corrosion in a reducing gas, but it can't withstand the impact and pressure load.