Use characteristics of the diaphragm
Diaphragm valve is the first one of the regulating valve.
China diaphragm valve manufacture-Datian Valve, the specialist of China valve manufacture, main product range: control valve, ball valve, automatic recirculation valve, gate valve, globe valve, check valve, choke valve, safety valve, plug valve, diaphragm valve, strainer, pressure reducing valve and valve products
(air source heat pump).It has the following Features:
(1) soft rubber diaphragm valves can cut off the media do not leak.
(2) a certain degree of corrosion resistance rubber, in the 1960s, but also no better corrosion-resistant material, it usually is treated as a corrosion-resistant materials to promote the use of, and even until today.
(3) the flow path is simple, “self-cleaning” effect, can be used for the medium is not clean.
(4) open features, but as a corrosion-resistant regulator valve, had to use the first part of the features quick, effective stroke is short, poor quality regulation.
(5) just like a fatigue test, force it to fold up and down, easy to destroy, because the diaphragm is an unreliable parts, resulting in valve life expectancy was short, this is a fatal drawback. Precisely because of this, the authors in recent years are stressed: It should be the elimination of diaphragm valves, ball valves, full-featured ultralight valve replaced.
(6) is closed, the media force the diaphragm up top, unbalanced force, requires a large amount of the actuator thrust, therefore, must be selected large, clunky, heavy implementing agencies, so that the valve weight becomes very heavy, ball valve, full-featured ultralight valve 3-4 times.
(7) in particular, needs to be emphasized is this: more and more corrosion-resistant material, especially in the late 1980s, fluorine plastic process is resolved, the advent of lined ball valve. Fluorine plastic than rubber, corrosion resistance, heat resistance, and ball valve core of the ball than the rigidity of the diaphragm valve diaphragm ten times, it is proposed in the corrosive medium cut and adjust the occasion, try not to use diaphragm valves, the choice of corrosion-resistant lined ball valve, butterfly valves and PTFE single-seat valve. Cite an example: valves, water treatment systems, desalinated water on the device 10 years ago, whether foreign or domestic installations, selected fluorine plastic diaphragm valves, its long life, about a year. short three to six months, therefore, the replacement of diaphragm. After selection of water treatment we recommend special ball valve, this problem is a good solution, the long life of 7-8 years, generally used up to 3 to 5 years.
Reproduced in:http://www.famens.com/html/2011/4-12/F9401946287.htm