Valve accessories
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Gentlemen, let’s discuss what the main configurations for the air circuit of valves are Is it possible to analyze it with images? For example, self-locking, position holding, zooming – what other functions are there? Could you please explain in detail the flow path of the instrument air and how the corresponding control functions are implemented? I’m trying to learn this. Sometimes at the site, I see valves equipped with numerous attachments that it’s difficult to identify, and the air pathways are also intricate and numerous; it’s really hard to understand how the valves are controlled. Thank you! I hope those who know more can share their knowledge generously:$
Take a look at the HG/T 21581-2012 Automation Installation Manual
The control valve consists of a valve positioner, an air filter and pressure regulator, etc. For valves that need to be shut off urgently, a two-position three-way solenoid valve is also used. The instrument air supply first passes through an air filter and pressure booster, and the air with reduced pressure then enters the electrical valve positioner； The electrical valve actuator is controlled by a DCS, PLC, or operator panel. It receives a 4–20mA DC signal, which it converts into the corresponding pneumatic signal to control the nozzle inside the actuator, thereby enabling the opening or closing of the valve