High pressure oxygen valve body and internal parts material selection, should follow the following three principles: & other; High flame retardancy & throughout; 、“ Release pressure & throughout; 、“ The lowest limit of thickness & throughout; 。 “ High flame retardancy & throughout; Refers to: when subjected to fire accident, not burning, not burning quenching performance engineering alloy. “ Release pressure & throughout; Is the possible particle impact of high purity oxygen ( 99. 7%) Without being limited by the velocity of flow in the maximum pressure. “ The lowest limit of thickness & throughout; Refers to: suitable for high pressure oxygen minimum thickness of valve parts material, the thickness of the material is a very important variable in the flammability test, as we all know, the material thickness of the thinner the kindle easily. With the thickness of the metal or alloy, oxygen valve should not be less than JB/T 12955 - 2016 'oxygen valve technical conditions' standard table 3 rules, the minimum thickness. European industrial gas association EIGA oxygen pipeline system, the IGC DOC 13/02 / E standard 4. 2. 2. Article 3: & other; Plating or coating surface can't meet the requirements, because in this process can not meet the need of thickness & throughout; 。 So any plating or thermal spraying material, cannot be used for high pressure oxygen Industrial Valves. Pipeline system is the choice of materials, the design speed and some of the possible maximum speed control application conditions, the speed is based on the normal operation and ventilation, rather than the mechanical failure, or other abnormal situations. Rate refers to the operating pressure, temperature and flow rate of the medium under the average speed in the pipe. V = Q/fv is refers to the average velocity, Q is refers to the actual volume flow pressure and temperature, f is refers to the port area. In a typical valve is Boeing's largest speed, when the absolute pressure ratio greater than 2:1 will produce a Boeing speed. In addition, increase the influence of pressure ratio on sound waves through the valve is very small, so the valve material selection is also a reference pressure ratio for more than 2. JB / T 12955 - 2016 'oxygen valve technical conditions' standard of & other; 5. Three principles of material selection & throughout; Material selection of oxygen valve for the following provisions: 5. 3. 1 contact with oxygen in metal materials, besides has special provisions, or the order contract, under pressure The velocity limit of material selection principle according to the provisions of the table 3. 5. 3. When the valve flow passage velocity more than (2 JB / T 12955 - 2016 'oxygen valve technical conditions') of the standard The range of table 1, the valve should choose corresponding saving materials under pressure, under the corresponding thickness of exemption from pressure are shown in table 4.
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