On the principle of pneumatic lift valves
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I’m not very familiar with the structure and principle of pneumatic lift valves. Could some expert please explain it with diagrams? I’d be extremely grateful. Videos or animations would be even better. It’s specifically the pneumatic lift valve used in bag dust collectors; any information on other types of lift valves would also be helpful for my learning
Do you mean the air release valve (it is closed when there is no air flow, which is also what is commonly referred to as a normally closed valve)? Different manufacturers have different structures, but the principle is similar. What is commonly used here is to use a pneumatic source to push open the valve; a spring inside the valve cylinder diaphragm exerts pressure on it, and the diaphragm is connected to the valve stem. In the absence of airflow, the valve remains closed due to the pressure of the spring; when there is airflow, the gas pushes against the diaphragm, overcoming the spring pressure and lifting it upward, thereby opening the valve.