High pressure oxygen stainless steel valve body and internal parts material selection, should follow the following three principles: 'high flame retardant', 'release stress' and 'minimum thickness limit'. 'High flame retardant' refers to: when subjected to fire accident, which does not burn, nor rendered combustion engineering alloy quenching performance. 'Release stress' is in particle impact of high purity oxygen can occur ( 99. 7%) Is not affected by the velocity limit of maximum pressure. 'Minimum thickness limit' means: suitable for high pressure oxygen minimum thickness of stainless steel valve parts material, the thickness of the material in the flammability test variables are extremely nervous, as we all know, the material thickness of the thinner the kindle easily. Oxygen stainless steel valves with the thickness of the metal or alloy, shall not be less than JB/T 12955 - 2016 'oxygen use stainless steel valve technical conditions' standard table 3 rules, the minimum thickness. European association for industrial gases to formulate EIGA the oxygen pipeline system the IGC DOC 13/02 / E standard 4. 2. 2. Article 3: 'the appearance of the plating or coating cannot be satisfied, as a result of adopting this process can not reach the necessary thickness'. So any plating or thermal spraying material, cannot be used in high pressure oxygen stainless steel valves. Piping system the choice of materials, the design speed and some of the possible maximum speed control application conditions, the speed is based on the equipment to normal operation and drafty, rather than in the case of mechanical failure or other very. 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 real volume flow of pressure and temperature, f is refers to the port area. In a typical stainless steel valve is Boeing's largest speed, when the absolute pressure ratio greater than 2:1 will produce a Boeing speed. In addition, the influence of pressure ratio on sound waves through the stainless steel valve is small chengdu personnel test web page, as a result, the choice of stainless steel Industrial Valves materials is also a reference pressure ratio for more than 2. JB / T 12955 - 2016 'oxygen use stainless steel valve technical conditions' standard of '5. 3 material selection principle of oxygen stainless steel Industrial Valves material selection for the following provisions: 5. 3. 1 contact with oxygen in metal materials, besides has the special provisions or order contract, under pressure Material selection of drift limit principle according to the provisions of the table 3. 5. 3. 2 when the flow velocity inside the stainless steel Industrial Valves port more than ( JB / T 12955 - 2016 'oxygen use stainless steel valve technical conditions') of the standard Table 1, the range of stainless steel valves should be chosen response under the pressure of the exemption materials search engine optimization, under the corresponding thickness of exemption from pressure are shown in table 4. Reproduced in the stainless steel valve users in July 2018, the total 49.
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