PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
Lining fluorine ball valve, you understand?
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
Dankai
Release time:
2022-10-24
Visits:
Fluorine-lined valves, also known as fluoroplastic-lined corrosion-resistant valves, are valves that place polytetrafluoroethylene resin (or profiles processed) on steel or iron pressure-bearing parts by molding (or inlay) methods.
(the same method applies to the lining of all kinds of pressure vessels and pipeline accessories) or the outer surface of the valve inner parts, using its unique properties in the resistance to strong corrosive media.
All kinds of valves and pressure vessels.
Brief Introduction of 1. Fluorine Lined Ball Valve
Polytetrafluoroethylene, commonly known as "plastic king", was first developed by DUPONT CO.,LTD in 1938 and was industrialized in 1949. from the perspective of industrial application
50 years of history, and really widely used in the valve industry is not long.
Fluorine lined valve is the valve body can reach the medium of the place all the use of lining technology, lining materials generally use FEP(F46) and PCTFE(F3) and other fluoroplastics, can be applied
Various concentrations of sulfuric acid, hydrochloric acid, hydrofluoric acid, aqua regia and various organic acids, strong acids, strong oxidants and other corrosive media such as pipeline, but the fluorine-lined valve is limited by the temperature is relatively large
(only applicable to medium between -50 ℃ ~ 150 ℃), valves that can be made of fluorine plastic lining are: fluorine-lined butterfly valve, fluorine-lined ball valve, fluorine-lined stop valve, fluorine-lined diaphragm valve, lining
Fluorine gate valve, fluorine-lined plug valve, etc.
Figure 1: Fluoride-lined ball valve Source: Dankai
Use of 2. fluorine lined ball valve
With the rapid development of modern industry, fluorine-lined valves and their various pipeline accessories have been rapidly applied in various fields such as petroleum, printing and dyeing, and chemical industry, showing a strong life
As the preferred project in the project has attracted great attention and favor of various engineering design units and construction units, it is a sunrise product with great market potential.
Fluorine-lined valve has the dual function of switching and flow regulation, which can easily open and close the gas path without affecting the flow and ensuring the repeatability of the flow. Open slowly, reducing the moment
Impact force of pipeline pressure on instrument. Quite added a damper, thus greatly extending the service life of the fluorine-lined valve. The fluorine-lined valve is specially used to control corrosive or strong corrosive medium.
The surface of the inner cavity of the valve body is covered with various fluoroplastics to choose from, which is suitable for different working temperatures and fluid pipelines. It has the characteristics of high strength and good corrosion resistance.
Figure 2: Fluorine-lined ball valve Source: Dankai
The price of fluorine-lined valves is high, and the working environment is harsh. It is not toxic and harmful chemicals, or various acids and bases or organic solvents with strong corrosiveness. Improper use will produce heavy
Great economic losses and serious consequences. Proper use and maintenance of valves can extend the service life of fluorine-lined valves, prevent all kinds of accidents, and ensure the normal operation of pipelines. Therefore,
Use must pay attention to the following points:
1. Before use, carefully read the product instructions.
2, according to the nameplate or instructions on the provisions of the pressure, temperature, the use of media within the scope of use.
3, when used to prevent the lining valve due to temperature changes in the pipeline stress is too large, minimize the temperature change, and increase the U-shaped expansion joint before and after the valve.
4. It is forbidden to use the lever to open and close the fluorine-lined valve. Pay attention to the opening and closing indication position and limit device of the fluorine-lined valve. After the opening and closing are in place, do not force the valve to close,
Avoid premature damage to the fluoroplastic sealing surface.
5. For some media are unstable and easy to decompose (such as the decomposition of some media will cause volume expansion and abnormal rise of working pressure), which will cause valve damage or leakage, it should be taken
Measures eliminate or limit the factors that cause decomposition of unstable media. When selecting the valve, the change of working condition caused by unstable medium and easy decomposition should be considered, and the automatic pressure relief device should be selected.
Fluorine-lined valves.
Figure 3: Fluoride-lined ball valve Source: Dankai
6. For fluorine-lined valves on toxic, flammable, explosive and strong corrosive medium pipelines, it is strictly forbidden to replace the packing under pressure. Although the fluorine-lined valve is designed to have upper sealing power
It is possible, but it is not recommend to replace the packing under pressure.
7. For pipelines with spontaneous combustion medium, measures shall be taken to ensure that the ambient temperature and working condition temperature shall not exceed the spontaneous ignition point of the medium to prevent sunlight or external fire
The danger it brings.
8, for the pipeline severe and long-term vibration, to take measures to eliminate, to avoid the resulting fluorine plastic lining valve damage.
9. During the use of fluorine-lined valves, the fluorine plastic sealing surface is often damaged by medium crystallization and solid particles due to soft texture, resulting in sealing leakage.
Repair or replace seals.
10. Some fluorine-lined valves are partially opened in use as flow adjustment. High-speed media cause premature damage to the sealing surface. In this case, the seals should be replaced in time.
11. Generally, no gasket is added to the flange in the fluorine-lined valve. If there is leakage at the middle flange, tighten the middle flange nuts evenly to eliminate the leakage. If the middle flange sealing surface is damaged, then
To repair the sealing surface and add the flange gasket to solve.
12, if the handle or hand wheel rotation is not flexible or can not open and close the valve lining fluorine, can be appropriate to loosen the gland nut. The rotation is still not flexible. It may be that the gland is skewed, so it should be adjusted.
The gland. After adjusting and loosening the gland, the valve cannot be flexibly opened and closed and lined with fluorine. It should be disassembled for inspection, dirt removal and troubleshooting. When removing this type of fluorine-lined valve, note
What medium is in the fluorine-lined valve pipeline, whether it has been used or newly installed. If the medium used is toxic, flammable and explosive substances, the staff should wear protective masks and protective hands.
Set, wear protective clothing in accordance with the operating procedures. Avoid accidents during disassembly and prevent accidents.
This article is originally created by Teflon's little sister. Welcome to pay attention and take you to grow knowledge together!
Key words:
Fluoroplastic, fluorine-lined ball valve, PTFE, fluoroplastic, seal
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