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Several problems should be paid attention to in application of fluorine plastic lined anticorrosive ȤӮ羺APP
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Several problems should be paid attention to in application of fluorine plastic lined anticorrosive ȤӮ羺APP
Reasonable selection and application of fluorine plastic lined anti-corrosion ȤӮ羺APP is a problem of concern in engineering. According to the user's experience in field application for many years, the following precautions are put forward for your reference.
Fluorine plastic lined anti-corrosion ȤӮ羺APP has been widely used in the equipment contacting with acid and alkali and other strong corrosive media in petroleum, chemical, pharmaceutical, metallurgy, electric power and other industries. However, according to our users' experience in field application for many years, the selection of fluorine plastic lined anti-corrosion ȤӮ羺APP should deal with the medium temperature, pressure, differential pressure, etc The following precautions are proposed:
1. Medium temperature used for fluorine plastic lined ȤӮ羺APPs: F46 (FEP) is used for all kinds of fluorine plastic lined ȤӮ羺APPs of our company, and the medium temperature used shall not exceed 150 (the medium temperature can reach 150 for a short time, and the service temperature for a long time shall be controlled within 120 ). Otherwise, the F46 lining of various parts of the ȤӮ羺APP is easy to soften and deform, resulting in the ȤӮ羺APP unable to close and the leakage is large ?
If the medium temperature is below 180 for a short time and 150 for a long time, another fluoroplastic PFA can be selected. However, the price of PFA lined fluoroplastics is higher than that of F46 lining. ?
2. Do not have negative pressure. The negative pressure in the pipeline should be avoided for the fluorine plastic lined ȤӮ羺APP. If there is negative pressure, the fluorine plastic lining layer in the ȤӮ羺APP cavity will be sucked out (bulged out) and shelled, resulting in the ȤӮ羺APP opening and closing failure.
The pressure difference should be controlled within the allowable range. In particular, the bellows sealed fluorine plastic lining control ȤӮ羺APP, stop ȤӮ羺APP. Because the bellows is made of PTFE material, the pressure and pressure difference are large, which can easily lead to the rupture of bellows. The packing is made of fluorine plastic, and the pressure difference can be adjusted. ?
Valve core, fluorine plastic, ȤӮ羺APP seat liner should not be used in the ȤӮ羺APP core, ȤӮ羺APP seat, etc. For the medium with hard particles, crystals and impurities, the ȤӮ羺APP core and ȤӮ羺APP seat can be replaced with Hastelloy.
5. The ȤӮ羺APP diameter should be selected correctly according to the required flow (CV value). In the selection, the ȤӮ羺APP diameter and ȤӮ羺APP opening degree should be calculated according to the required flow (CV value) and other technical parameters. If the ȤӮ羺APP diameter is too large, it is bound to make the ȤӮ羺APP operate under the condition of small opening degree for a long time, plus the pressure of the medium, so that the ȤӮ羺APP core and rod are easily impacted by the medium, causing the ȤӮ羺APP to vibrate, and the ȤӮ羺APP core rod will be in the medium for a long time Under the impact of, even make the ȤӮ羺APP stem fracture. ?
When choosing various fluorine plastic lined ȤӮ羺APPs, users should try their best to understand and master the technical conditions, so as to select and use them well and improve the service life of the ȤӮ羺APPs. In case of exceeding the scope of technical conditions for use, it shall be put forward to the company for consultation and take corresponding countermeasures to solve the problem.
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