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Material selection requirements for main body of stainless steel globe valve

2020-11-18 19:47:46
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  Stainless steel globe valve The following three principles should be followed in the scientific selection of materials for main body and internal parts: "high flame retardancy", "exemption from system pressure" and "maximum limit design thickness".

"High flame retardant" refers to the engineering alloy that does not burn and does not show combustion quenching characteristics in case of accident.

High purity (99.7%) of the pressure on which we carry out pressure is not limited.

 Flange stop valve

"Small limit thickness" means: suitable for stainless steel Globe valve As we all know, the thinner the material, the easier to ignite. The thickness of stainless steel or stainless steel globe valves specified in the 2016-55 alloy globe valve shall not be less than that specified in the specification of stainless steel 1293. Article 4.2.2.3 of the standard igcdoc 13 / 02 / E of the EGA oxygen piping system was developed by the European industrial gases association to the effect that "the appearance of plating or spraying cannot meet the requirements because the process cannot achieve the necessary thickness". Therefore, any electroplating or thermal spraying materials can not be used for high pressure oxygen stainless steel stop valve.

The selection of pipeline architecture materials can be controlled by the program conditions of some technical applications of the design enterprise's operation development speed and possible large economic operation speed. These Chinese speed is based on the normal operation and ventilation of network equipment, rather than under mechanical failure or other countries' extraordinary circumstances. Speed refers to the average growth rate of medium in pipeline under operating pressure, temperature and flow rate.

  v=Q/f

V refers to the average development speed, Q refers to the volume flow under the pressure and temperature of social reality, and f refers to the channel area.

The speed in a typical stainless steel globe valve is Boeing speed. When the mental pressure ratio is greater than 2:1, Boeing speed will be developed. In addition, the effect of sound wave through the use of stainless steel stop valve is very small, so the selection of stainless steel stop valve material is also reference learning pressure ratio of more than 2.

JB / t12955-2016 "stainless steel globe valve technical conditions standard 5.3 material selection principle" stipulates as follows:

5.3.1 for metal materials in contact with oxygen, except for special management regulations or requirements in order service contract, the design and selection principle of materials subject to pressure flow rate shall be in accordance with table 3.

5.3.2 when the flow in the channel of stainless steel stop valve exceeds the flow specified in JB / T 12955-2016 stainless steel stop valve specification, the stainless steel stop valve shall be made of pressure relief material, and the pressure relief under corresponding thickness is shown in Table 4.



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