Lined with fluorine plastic anti-corrosion valves in petroleum, chemical, pharmaceutical, metallurgy, electric power and other industries contact Acid-base and other strong corrosive media has been widely used in the device, but on how to select good, lined with fluorine-plastic valve, according to our customers over the years on site application experience, on the lining of fluorine-plastic anti-corrosion valve when choosing to respond to media temperature, pressure, Several conditions for the use of poor pressure to make the following considerations:

1, lining fluorine plastic valve used media temperature: My company's various types of fluorine-lined plastic valve, the use of fluorine plastic is F46 (FEP), the medium temperature can not exceed 150 ℃ (medium temperature can be up to 150 ℃ for a short period of time, the use of a long period of temperature should be controlled within 120 ℃), otherwise, valve parts lined F46 easy to soften, Deformation, resulting in the valve is not dead, leakage volume.

If the use of medium temperature in a short time temperature of 180 ℃, a long time temperature of 150 ℃ below, you can choose another fluorine plastic; PFA, but the lining of PFA fluorine plastic than the lining of the F46 in price more expensive.

2, do not have negative pressure. Lining fluorine plastic valve should avoid the use of the pipeline has negative pressure, such as negative pressure, easy to cause the valve cavity lining fluorine plastic layer is sucked out (bulge), shelling, resulting in valve open, closed failure.

3, pressure, pressure difference should be controlled within the allowable range. In particular, corrugated pipe seal lined with fluorine-plastic control valve, cut-off valve. Because Bellows is made of PTFE material, pressure, pressure difference, easy to cause bellows rupture.

Corrugated pipe seal lining fluorine plastic control valve, the use of conditions of pressure, pressure differential, can be changed to PTFE filler seal.

4, lined fluorine plastic valve used in the medium conditions should not have hard particles, crystallization, impurities, etc., lest the valve in the open, closed operation of the grinding valve core, valve seat lining fluorine-plastic layer or PTFE corrugated pipe. For media with hard particles, crystals, impurities, when selected, spool, valve seat can be converted to the HA alloy.

5, lining fluorine plastic control valve should be in accordance with the required flow (CV value) correct selection of valve size. In the selection, should be based on the required flow (CV value) and other technical parameters to calculate the valve should choose the size and valve opening, if the valve size is too large, it is bound to make the valve in the open degree of small operating conditions, coupled with the pressure of the media, so easy to make the valve spool, rod by the impact of the media to make the valve vibration, Valve core rod In the medium of long-term impact, even the stem break.

Users in the selection of various types of fluorine-plastic valve, should be as far as possible to understand, master the use of technical conditions in order to select good, good use, improve the service life of the valve. In the face of exceeding the use of technical conditions, should be submitted to the manufacturer, common consultation, to take appropriate countermeasures to solve.