Fluorine-lined Valve Manufacturers: Design Issues Of Fluorine-lined Valves
Design issues of Lined Valve
With the rapid development of modern petrochemical industry, the development of fluorine-lined valves and lined valves, the early rubber-lined and enamel-lined valves can no longer meet the ever-changing industrial needs. People are constantly seeking economical and reasonable ways to solve these industrial needs, so fluorine-lined valves and lined valves of various materials, among which fluorine-lined valves are a wonder among lined valves. In the past 20 years of production and use, it has become one of the most widely used valve varieties in the modern petrochemical industry.
In the many years of research and development of fluorine-lined valves and lined valves by Yate, the real large-scale production is still a matter of nearly ten years, so there is no unified special industry product standard. Generally, manufacturers refer to the steel valve standard design and manufacture, continuously explore and summarize in production practice, formulate enterprise standards, and guide fluorine-lined valves and lined valves according to enterprise standards.
Design, manufacture and testing of valves. As we all know, fluoroplastics are a kind of thermoplastic material with excellent performance. They were originally used in the aerospace industry. Typical polytetrafluoroethylene (PTFE) materials have excellent heat resistance and cold resistance, and can be used for a long time in the range of -195℃ to 200℃.
Low friction, good self-lubrication, good electrical insulation, good chemical stability, resistance to corrosion by various strong acids, strong alkalis, strong oxidants, and even resistance to "aqua regia", it is called the "king of plastics". Because fluoroplastics have
These excellent characteristics are particularly suitable for making valve materials with strong corrosion resistance, partially replacing expensive Hastelloy and titanium alloy materials, and making rational use of resources. Due to the relatively low tensile strength and hardness of fluoroplastics, it is not suitable for making valve shell materials alone, so it is usually used as a lining material. The shell materials of fluorine-lined valves and lined valves generally include gray cast iron, ductile iron, carbon steel, stainless steel, copper alloy, aluminum alloy, etc. Due to low mechanical strength, gray cast iron is easy to break
It is used less.
The design pressure of fluorine-lined valves and lined valves is generally called PN≤2.0Mpa (150Lb). The use temperature is determined comprehensively according to the shell material and the applicable temperature of fluoroplastics. The working temperature of carbon steel fluorine-lined valves and lined valves is generally -29℃～180℃.
The nominal diameters of various fluorine-lined valves and lined valves can be determined according to the production conditions of the enterprise. The nominal diameters of fluorine-lined valves and lined valves listed in Table 1 are for reference.
The technical conditions of various fluorine-lined valves and lined valves can refer to the technical conditions or design specifications of the corresponding metal valves. For example:
a. The technical requirements of fluorine-lined gate valves refer to the provisions of GB/T1234.
b. The technical requirements of fluorine-lined stop valves and fluorine-lined lifting check valves refer to the provisions of GB/T1235.
c. The technical requirements of fluorine-lined check valves refer to the provisions of GB/T1236.
d. The technical requirements of fluorine-lined ball valves refer to the provisions of GB/T1237.
e. The technical requirements of fluorine-lined butterfly valves refer to the provisions of GB/T1238.
f. The technical requirements of fluorine-lined diaphragm valves refer to the provisions of GB/T1239.
g. The technical requirements of fluorine-lined plug valves refer to the provisions of GB/T1240.
