The reason why there is no gas from the exhaust hole of the pneumatic sanitary diaphragm valve

The reason why no gas is discharged from the exhaust hole of the pneumatic sanitary diaphragm valve. Recently, a company installed pneumatic sanitary diaphragm valves of different specifications on the site, and the operating conditions were the same. After the installation was completed, the air source was connected and the pressure was 4.5 kg. One of the pneumatic sanitary diaphragm valves did not act. Later, the air source pressure increased to 8 kg, but the valve still did not act. On-site technicians were puzzled. So I called the manufacturer for consultation. The manufacturer promptly sent technicians to the site to understand the situation and conduct tests. It was found that no gas was discharged from the vent hole when the gas source was input. The preliminary analysis was that the vent hole was blocked. Later, when the cylinder head was opened, it was found that there were foreign objects in the cylinder of the sanitary diaphragm. It turned out that the on-site personnel accidentally pushed the dust cover into the cylinder piston cavity during installation, and sealed the exhaust hole, which caused the gas to be unable to discharge and the piston was blocked. Dead, the valve does not move. Finally, the foreign body was taken out, and the valve worked normally. When selecting a pneumatic sanitary diaphragm valve, you must choose a high-quality manufacturer, and at the same time, operate in strict accordance with the requirements of the instruction manual to avoid unnecessary failures. Pneumatic sanitary diaphragm valves are often used in our machinery industry, so what are the characteristics of our use of diaphragm valves? Today, I will introduce the characteristics of the diaphragm valve in use: 1. Small fluid resistance; 2. More suitable for corrosive, slurry media, and viscous; 3. Cannot use high pressure occasions; 4. Can use hard suspension media, The medium is only in contact with the valve body and the diaphragm, so there is no need for stuffing box, there is no problem of stuffing box leakage, and it is not corrosive to the valve stem. 5. Rubber has good corrosion resistance. There is no better corrosion resistance material. We should use it as a corrosion-resistant material; 6, a softer rubber diaphragm valve can cut off the non-leakage of the medium; 7, flow The path is simple, generally used in the dirty medium; 8, the opening characteristic, when we use the corrosion-resistant regulating valve, use the front part of the quick opening characteristic, and the effective stroke is short.