Fluorine lined butterfly valve: The lining material of fluorine lined butterfly valve is fluoroplastic, and most materials on the market are made of polytetrafluoroethylene, codenamed polytetrafluoroethylene. PTFE materials have strong corrosion resistance and can be used in highly corrosive media, such as strong acids and alkalis. At the same time, the material also has certain heat and cold resistance properties, suitable for temperatures between -196200 ℃. Advantages: 1. The fluorine lined butterfly valve relies on the excellent performance of polytetrafluoroethylene to effectively isolate the medium and valve body, achieving the goal of corrosion prevention. It has been widely used in fields such as petroleum, chemical, and environmental protection.
#Valve # 2. Fluorine lined butterfly valves have high cost-effectiveness at room temperature and pressure, and can be used instead of stainless steel valve bodies.
Hard seal butterfly valve: A butterfly valve with metal or other hard materials on both sides of the sealing ring is called a "hard seal". This type of seal has poor sealing performance, but has high temperature resistance, wear resistance, and good mechanical properties. For example: steel+steel, steel+copper, steel+graphite, steel+alloy steel (the steel here can also be cast iron, cast steel, alloy steel or surfacing, spraying alloy). Advantages: 1. It has high temperature resistance, wear resistance, and good mechanical properties, with a long service life. 2. The hard sealed butterfly valve adopts a precise J-shaped elastic sealing ring and a triple eccentric multi-layer metal hard sealing structure, widely used in metallurgy, power, petrochemical, water supply and drainage, municipal buildings, and other industrial pipelines with medium temperatures below 425 ℃.
Differences in structure and characteristics between fluorine lined butterfly valves and hard sealed butterfly valves
1、 Conditions and their own structural differences (1) Applicable conditions: fluorine lined butterfly valves can be used at room temperature and atmospheric pressure, while hard sealed butterfly valves can be used under lower temperature, room temperature, high temperature and other environmental conditions. (2) Structural angle: The former has two contact surfaces and can be made of one or more soft materials. For example, the butterfly plates and seats of fluorine lined butterfly valves are wrapped in PTFE. The latter means that both sides of the sealing pair are made of metal or other hard materials. (3) In terms of machining: In principle, the two seem to be similar to each other, mainly the valve seat. The former is a non-metallic structure, while the latter is a metallic structure. When selecting, it is necessary to comprehensively consider the relationship between its material, hardness, working conditions, and suitable media.
2、 Differences in performance characteristics (1) From the perspective of sealing ability: The advantage of fluorine lined butterfly valves lies in their excellent sealing ability, and their sealing effect can also achieve zero leakage. However, the disadvantage is that it is relatively prone to aging and has a relatively short application life. Hard sealed valves have a longer working time, but their sealing ability is weaker. (2) Corrosion resistance: The former is mainly used for pipelines containing corrosive media, and its corrosion resistance is also stronger than the latter.
