Improve diaphragm quality to ensure the stability of sanitary diaphragm valves
The sanitary diaphragm valve is remotely controlled by the drive unit or manually operated by the handle. The drive unit has three standards: normally closed, normally open and air. The utility model has the advantages of simple structure, beautiful appearance, quick disassembly and assembly, flexible operation, small fluid resistance and safe and reliable use. It is widely used in the control of water, gas, oil and corrosive media in food, pharmaceutical, chemical and petroleum industries.
It is reported that a company installed pneumatic hygienic-grade diaphragm valves of different specifications at the installation site, and the working conditions are the same. After the installation is completed, the air source is turned on, and the pressure is 4.5 kg. One of the pneumatic sanitary-grade diaphragm valves has no action. Later, the pressure of the air source is increased to 8 kg, and the valve still does not operate, and the on-site technicians cannot solve the problem.é‚ Called the manufacturer to consult, the manufacturer dispatched technicians to the field to understand the situation and conduct tests. It was found that when the gas source was input, there was no gas discharge from the vent hole, and the preliminary analysis was that the vent hole was blocked. Later, the cylinder head was opened and it was found that there was foreign matter in the cylinder of the sanitary diaphragm. It was originally that the on-site personnel accidentally put the dust jacket into the cylinder piston cavity during installation, and sealed the exhaust hole, resulting in the gas being unable to be discharged. Dead, the valve does not move. After the technician removes the foreign matter, the valve works normally.
According to industry insiders, when selecting a pneumatic sanitary grade diaphragm valve, it is necessary to select a high-quality manufacturer, and at the same time, strictly follow the requirements of the instruction manual to avoid unnecessary failures. Diaphragm valves are often used in industries such as food and medicine, so what are the characteristics of our diaphragm valves?
Wenzhou Jiaen Stainless Steel Co., Ltd. introduced the characteristics of the diaphragm valve in use:
1. Low fluid resistance;
2. More suitable for corrosive, slurry medium, viscosity;
3. Can not use high pressure occasions;
4. The medium of hard suspension can be used. The medium only contacts the valve body and the diaphragm, so no stuffing box is needed, there is no problem of leakage of the stuffing box, and the valve stem is non-corrosive.
5, the rubber has good corrosion resistance, no better corrosion-resistant material, we have to use it as a corrosion-resistant material;
6, soft rubber diaphragm valve can cut off the leakage of the medium;
7, the flow path is simple, generally used in dirty media;
8, open characteristics, when using corrosion-resistant control valve, the front part of the quick-opening feature, the effective stroke is short.
It is reported that pneumatic valve manufacturers, in order to compete for products, each carry out different innovations under the concept of unified design of pneumatic valves, forming their own corporate standards and product personality. Therefore, the purchaser puts forward the technical requirements in detail when purchasing the pneumatic valve, and obtains a consensus with the manufacturer. It is necessary to be an attachment to the pneumatic valve procurement contract.
With the rapid development of the pharmaceutical, food and other industries, the requirements for diaphragm valves and other equipment are getting higher and higher, and the market prospects of high-end diaphragm valves are broad. According to industry insiders, diaphragm valves are critical to the quality of the diaphragm and reliability issues. Therefore, the diaphragm valve manufacturer should seize the market demand and solve the quality problem of the diaphragm valve through the structural design, so that the diaphragm can be fully protected by the support structure during the opening and closing process, achieving high pressure resistance and keeping the work stable and reliable.
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