襯氟塑防腐閥門在石油、化工、醫藥、冶金、電力等行業接觸酸堿等強腐蝕介質的裝置上已得到了廣泛的應用，但對選好、用好襯氟塑閥門，根據我們廣大用戶多年來現場應用的經驗，對襯氟塑防腐閥門選用時應對介質溫度、壓力、壓差等幾項使用條件提出如下注意事項：

１、襯氟塑閥門使用的介質溫度：我公司的各類襯氟塑閥門，采用的氟塑料是F46（FEP），使用的介質溫度不能超過150℃（介質溫度短時間可到150℃，長時間的使用溫度應控制在120℃內），否則，閥門的各部件襯的F46易軟化、變形，致使閥門關不死、泄漏量大。

如遇到使用的介質溫度短時間溫度在180℃以下，長時間溫度在150℃以下，可選用另一種氟塑料—PFA，但襯PFA氟塑料的要比襯F46的在價要貴一些。

2、不要有負壓。襯氟塑閥門應避免使用的管道內有負壓，如有負壓，易造成閥門內腔的襯氟塑層被吸出（鼓出）、脫殼，導致閥門開啟、關閉發生故障。

3、壓力、壓差應控制在允許范圍內。尤其是波紋管密封的襯氟塑調節閥、截止閥。因波紋管是四氟材料制作的，壓力、壓差大，容易導致波紋管破 波紋管密封的襯氟塑調節閥，使用條件壓力、壓差大的，可改為四氟填料密封。

4、襯氟塑閥門使用的介質條件不宜有硬質顆粒、結晶、雜質等，以免閥門在開啟、關閉的運行中磨破閥芯、閥座的襯氟塑層或四氟波紋管。對介質有硬質顆粒、結晶、雜質的，選用時，閥芯、閥座可改用哈氏合金。

5、襯氟塑調節閥應按需要的流量（Cv值）正確選用閥門的通徑大小。在選用時，應根據需要的流量（Cv值）等技術參數計算閥門應選用的通徑和閥門的開啟度，如閥門的通徑選得太大了，勢必使閥門長期在開啟度較小的情況下運行，加上介質的壓力，這樣容易使閥門的閥芯、桿受到介質的沖擊而使閥門產生振動，閥芯桿長期在介質的沖擊下，甚至會使閥桿斷裂。

用戶在選用各類襯氟塑閥門時，應盡可能的了解、掌握使用技術條件，以便選好、用好，提高閥門的使用壽命。在遇到超出使用技術條件范圍時，應向制造廠提出，共同協商，采取相應的對策予以解決。

Fluorine plastic valves device contact acid and other strong corrosive medium in the petroleum, chemical,pharmaceutical, metallurgy, electric power and other industries has been widely used, but how to choose, use offluorine plastic valve, according to our customers for many years of experience in field application, the fluorine plasticanti-corrosion valve selection response medium temperature, pressure, pressure differential and so on several conditions of use of the following precautions:

1, fluorine plastic medium temperature valve used: all kinds of my company of fluorine plastic valve, fluorine plastic is used in F46 (FEP), medium temperature should not usemore than 150 ℃ (medium temperature short time can beup to 150 ℃, the use of temperature for a long time should be controlled at 120 ℃), otherwise, the valves lining F46 easily softening, deformation, resulting in valve related death, large leakage.

If the medium temperature short time temperature below 180 ℃, long time at temperature of 150 ℃, can chooseanother fluorine plastic PFA, but PFA lining fluorine plasticlining F46 than more expensive in price.

2, do not have negative pressure. Fluorine plastic valves should avoid using negative pressure inside the pipeline and, if negative pressure, easily lead to the valve cavity of fluorine plastic layer was aspirated (drum), shell, causing the valve to open, close failure.

3, pressure, pressure should be controlled within the allowable range. Especially the fluorine plastic bellows sealed valve, globe valve. Because PTFE bellows is produced, pressure, pressure large, easily lead to broken bellows.

Fluorine plastic bellows sealed valve, use pressure,pressure large, could be replaced by PTFE packing seal.

4, fluorine plastic valves should not use the media conditions are hard particles, crystal, impurity, so that the valve in the open, close the running frayed spool, the valve seat of fluorine plastic layer or PTFE bellows. The medium of hard particles, crystal, impurity, selection, the spool, the valve seat can be switched Hastelloy alloy.

5, fluorine plastic flow control valve should be required (Cv value) the correct selection of the size of the valve diameter. In the selection, should be based on the required flow (Cv value) calculation of technical parameters such as valve should choose the path and the valve opening degree, such as the diameter of the valve is chosen toolarge, will cause the valve opening degree is relatively small operation of the long-term, with medium pressure, so easy to make the valve the valve rod by the media, the impactand the vibration valve, the valve rod impact in the medium term, or even cause the valve stem fracture.

Users in the selection of various types of fluorine plastic valve, as far as possible to understand, master the use oftechnology, in order to choose, use, improve the service life of valve. In the face of conditions beyond the use of technology range, should put forward, to the factoryconsultation, take appropriate measures to be addressed