Pneumatic diaphragm valve selection

pneumatic diaphragm control valve is one of the earliest, it USES the following features: ( ） Soft rubber diaphragm diaphragm to cut off the media does not leak. （ ） A corrosion resistance of the rubber diaphragm for some years, before, is there a better corrosion resistant material, it is often used as a corrosion resistant material, but also promoted the use, even to this day. （ ） Pneumatic diaphragm valve flow is simple, 'self-cleaning' role, can be used to clean medium. Figure - （ ） Pneumatic diaphragm valve open the properties, but as a corrosion resistant regulating pneumatic diaphragm valve, only the first part of the short effective stroke control quality is not good quick opening characteristics. （ ） Like a diaphragm fatigue test pieces, forcing it to fold easily damaged, because the diaphragm is a solid parts, the result of the pneumatic valve life, this is a fatal flaw. Because of this, the authors stressed that in recent years: should cancel the pneumatic diaphragm valve, pneumatic ball valve, pneumatic valve fully functional super light replaced. （ ） Pneumatic diaphragm valve closed, media power up top diaphragm, unbalanced force is bigger, need a large thrust actuator, therefore, must carry out special Big Ben weight choice, for the weight of the pneumatic valve is very heavy, is The Times of pneumatic valves, pneumatic diaphragm valve is a fully functional ultra light - of pneumatic valve Times. （ ） , particularly the diaphragm, need to be emphasized that a growing number of corrosion resistant materials, especially in the technology of s solved the plastic lining, lined with the ball. Because of fluorine rubber than plastic corrosion resistance, temperature, pneumatic ball valve core, ten times than the diaphragm stiffness, and suggested that the cuts and adjustment of corrosive medium, try not to use the diaphragm, the selection of corrosion resistant lining pneumatic ball valve, pneumatic valve and ptfe all single-seat pneumatic valve. Take an example: in the water treatment system, the use of pneumatic valve water desalination plant years ago, both foreign and domestic units that are equipped with a plastic lining pneumatic diaphragm valve, as long as its life, as long as to short months, therefore, changing the diaphragm. Suggestions after treatment, the choice of special pneumatic ball valve, this problem is a very good solution, the service life of the diaphragm can reach to years, generally can be used to years.