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Yangzhou Kaidesi Environmental Protection Equipment Co., Ltd. specializes in the development of electric valves and electric actuators

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Introduction to the selection and maintenance of fluorine-lined flanged ball valves

发表时间:2018-08-23 13:03:19 Article source: Publication time: 2018-08-23 13:03:19

The price of fluorine-lined ball valves is much lower than that of corrosion-resistant stainless steel valves and Hastelloy valves. Some metal valves with strong corrosive media cannot be used. Only plastic-lined valves can be used. However, the fluorine-lined ball valve must be properly applied. I hope to pay attention to several technical conditions such as application pressure and temperature. Take the fluorine-lined ball valve products of electric actuator manufacturers as an example:

First: the temperature of the medium used for fluorine-lined ball valves: various types of fluorine-lined plastic valves used by Jingwei Pump Valve Co., Ltd., the fluorine plastic used is F46 (FEP), the medium temperature used can not exceed 150 ℃ ℃, the long-term use temperature should be about 120 ℃), otherwise, the F46 of each component of the fluorine-lined ball valve is easy to soften and deform, which will cause the valve to close immortally and cause large leakage.

If you encounter the temperature of the medium used by the user, the short-term temperature is below 180 ° C, and the long-term temperature is below 150 ° C, another fluoroplastic-PFA can be selected, but the PFA-lined fluoroplastic is more expensive. It should be pre-packaged when supporting Inquiry.

Second: The medium conditions used for fluorine-lined ball valves should not have hard particles, crystals, impurities, etc., so as to avoid the valve core, the fluorine-lined plastic layer of the valve seat or the tetrafluoro bellows being worn during the opening and closing operations. For medium with hard particles, crystals, and impurities, the valve core and valve seat can be replaced with Hastelloy when selected, but another inquiry is required.

Three: Do not have negative pressure. Fluorine-lined ball valves should avoid negative pressure in the pipeline. If there is negative pressure, it is easy to cause the fluorine-lined plastic layer in the inner cavity of the valve to be sucked out (swelled out) and shelled, resulting in failure of the valve opening and closing.

If you encounter the temperature of the medium used by the user, the short-term temperature is below 180 ° C, and the long-term temperature is below 150 ° C, another fluoroplastic-PFA can be selected, but the PFA-lined fluoroplastic is more expensive. It should be pre-packaged when supporting Inquiry.

Four: The pressure and differential pressure should be controlled within the allowable range. Especially the fluorine-lined globe valve with bellows seal. Because the bellows is made of PTFE material, high pressure and high differential pressure can easily cause the bellows to rupture.

Bellows-sealed fluoroplastic-lined regulating valve can be changed to PTFE packing to seal under the condition of high pressure and pressure difference.

Five: The fluorine-lined ball valve should be properly selected according to the required flow rate (CV value). When selecting, you should

Flow rate (CV value) and other technical parameters calculate the opening degree of the valve and the diameter of the selected valve. If the valve diameter is too large, it will inevitably make the fluorine-lined ball valve operate with a small opening for a long time, plus the pressure of the medium, which will easily cause the valve to be vibrated by the impact of the medium. Under the impact and vibration of the medium, the valve stem may even be broken.

When supporting (selecting) various types of fluorine-lined ball valves, users should understand and master the technical conditions as much as possible in order to select and use them well to improve the service life of the fluorine-lined ball valves.

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