The structure and working principle of pneumatic shut-off valve – an important part of revealing automation equipment

With the continuous improvement of industrial automation, the application of pneumatic cut-off valve is more and more extensive. In many industrial fields, pneumatic cut-off valves play an important role, such as petroleum, chemical, metallurgy, building materials and so on. Today, we will take a detailed look at the structure and working principle of the pneumatic cut-off valve in order to better understand and apply this important equipment.

First, the basic structure of the pneumatic cut-off valve

The pneumatic cut-off valve is mainly composed of the following parts: valve body, valve cover, valve core, driver, sealing ring and connecting parts. The valve body and valve cover provide structural support for the pneumatic cut-off valve; The spool is the core component of the pneumatic cut-off valve, which is responsible for controlling the flow of the medium; The driver is responsible for converting the air source signal into mechanical motion, driving the valve core to realize the switch; The sealing ring ensures the sealing performance of the valve; The connector connects the pneumatic cut-off valve to the piping system.
Second, the working principle of the pneumatic cut-off valve
The working principle of the pneumatic cut-off valve can be summarized as the following steps:
1. When the pneumatic cut-off valve needs to be closed, the air source system provides the compressed air signal to the driver. Compressed air enters through the drive’s air intakes, pushing the drive’s pistons outward.
2. When the piston of the driver moves outward, lift the spool upward through the connecting rod mechanism. The gap between the spool and the seat becomes larger, and the medium cannot flow, so as to achieve the purpose of cutting off.
3. When the pneumatic cut-off valve needs to be opened, the air source system stops supplying gas. The spring of the driver springs back and presses the spool down so that the spool fits tightly into the seat. At this time, the medium can smoothly pass through the pneumatic cut-off valve.
4. In order to ensure the sealing performance of the pneumatic cut-off valve, a sealing ring is arranged between the spool and the seat. In the case of a tight fit between the spool and the seat, the sealing ring can effectively prevent media leakage.
In summary, the structure and working principle of the pneumatic cut-off valve is relatively simple, but its role in the field of industrial automation is crucial. Understanding the structure and working principle of pneumatic shut-off valve helps us to better use this equipment and improve production efficiency and safety.