How to choose fluorine-based valve

The price of fluorine-lined valves is much lower than that of corrosion-resistant stainless steel valves, and some strong corrosive medium metal valves cannot be used. Only fluorine-based valves can be used well. However, the fluorine-containing valve must be properly applied. Attention should be paid to several technical conditions such as application pressure and application temperature. The following is an example of our company's products:

(1) Media temperature for fluorine-lined valves: All types of fluoroplastic valves, the fluorine plastic used is F46 (FEP), the medium temperature used can not exceed 150°C (media temperature can reach 150°C for a short time, long time use The temperature should be around 120°C. Otherwise, the F46 lining the parts of the valve can easily be softened and deformed, causing the valve to close dead and a large amount of leakage. If you encounter the user's media temperature, short time temperature below 180 °C, long time temperature below 150 °C, you can use another kind of fluorine plastic - PFA, but the price of PFA fluorine plastic is more expensive, when supporting Prior inquiry.

(2) Do not have negative pressure. The fluorine-lined valve should avoid the use of negative pressure in the pipeline. If there is negative pressure, the fluorine-containing plastic layer in the inner cavity of the valve can easily be sucked out (bulging out) or shelled, causing the valve to open and close.

(3) The pressure and pressure difference should be controlled within the allowable range. Especially the bellows sealed fluoroplastic control valve, globe valve. Because the bellows are made of PTFE, the pressure is high and the pressure difference is high, which easily causes the bellows to break. Bellows sealed fluorine-lined control valve, using the conditions of pressure, high pressure difference, can be replaced by PTFE packing seal.

(4) The medium conditions used for the fluorine-based valve should not be hard particles, crystals, impurities, etc., so as to avoid the valve worn in the opening and closing operation of the valve core, valve seat, fluorine layer or PTFE bellows.

(5) The fluoridation control valve should be properly selected according to the required flow rate (CV value). When selecting, the opening degree of the valve and the diameter of the selected valve should be calculated according to the technical parameters such as the required flow rate (CV value). If the diameter of the valve is too large, it will inevitably cause the valve to run for a long time with a small degree of opening. With the pressure of the medium, the valve can easily be vibrated by the impact of the medium. The valve plug rod is in the medium for a long time. Under shocks and vibrations, the valve stem may even break.

When matching (selecting) all kinds of fluorine-containing valves, as far as possible to understand and master the use of technical conditions in order to choose, use, improve the service life of the valve. In the case of exceeding the technical conditions of use, it should be proposed to the manufacturer and discussed together.

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