fluorine lining gate valve

Diaphragm valve features

by:Lianke Valve     2022-08-15
Diaphragm valve is one of the earliest regulating valves. It has the following characteristics: (1) The soft rubber diaphragm valve can cut off the medium without leakage. (2) Because rubber has a certain corrosion resistance, before the 1960s, there was no better corrosion-resistant material, and it was usually used as a corrosion-resistant material for promotion and application, and even continues to this day. (3) The flow path is simple and has a 'self-cleaning' effect, which can be used for unclean media. (4) Opening characteristics, but when used as a corrosion-resistant control valve, the front part of the quick-opening characteristic has to be used, which has a short effective stroke and poor adjustment quality. (5) It is like a fatigue test piece, forcing it to fold up and down is easy to damage, because the diaphragm is an unreliable part, resulting in a short valve life, which is a fatal disadvantage. Because of this, the author has emphasized in recent years that diaphragm valves should be eliminated and replaced with ball valves and full-featured ultra-light valves. (6) When closing, the force of the medium pushes the diaphragm upward, the unbalanced force is large, and a large thrust of the actuator is required. Therefore, a particularly large and heavy actuator must be selected to make the valve weight become It is very bulky, 2 times that of ball valves, and 3-4 times that of full-featured ultra-light valves. (7) It should be emphasized that there are more and more corrosion-resistant materials, especially in the late 1980s, when the fluorine-lined plastic process was solved, and the fluorine-lined ball valve came out. Since fluoroplastic is more corrosion-resistant and temperature-resistant than rubber, and the ball core of the ball valve is ten times more rigid than the diaphragm of the diaphragm valve, it is recommended that in the case of cutting and adjusting the corrosive medium, the diaphragm valve should not be used as much as possible, and the corrosion-resistant lining should be used. Fluorine ball valve, butterfly valve and PTFE single seat valve. Let’s take an example to illustrate: in the water treatment system, the valve used in the desalination device, 10 years ago, whether it is foreign or domestic, all use the diaphragm valve lined with fluorine plastic, and its service life is about one year. As short as 3 to 6 months, therefore, the diaphragm is constantly being replaced. After choosing our recommended special ball valve for water treatment, this problem has been solved well, with a life span of 7 to 8 years, and generally can be used for 3 to 5 years.
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