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Master operating principle and installation of pneumatic valve

Pneumatic control valve and electric control valve is actually a difference, it is necessary to understand the working principle of the pneumatic control valve and installation issues, so that you can use it better. Even during the installation and use, it can reduce the occurrence of more trouble. I believe this is the problem most operators want to understand.

Since the pneumatic control valve is driven by the electric valve positioner, the converter and other accessories to drive the valve, it finally can achieve the switch or proportional adjustment, but if you want to receive the control signal of the industrial automation control system, in order to complete Adjust the pipeline medium, mainly including flow, pressure, temperature and other process parameters. Of course, it is characterized by simple control, rapid response, and safety, and no need to use any explosion-proof measures at all. So what kind of problems do you need to pay attention to during installation?

When it comes to the problems that need attention, in fact, when you install it, you need to know that the valve will be adjusted. Its installation position must be a certain height above the ground, especially the upper and lower sides of the valve need to leave a space to facilitate the valve. Disassembly and repair. However, if there is a pneumatic valve positioner and hand wheel adjustment valve, then ensure operation, observation and adjustment can be. However, if the valve is installed in a horizontal pipeline, the upper and lower pipes need to be perpendicular to the pipeline, and a support is provided under the valve to ensure stability and reliability. Can encounter special occasions, may be installed horizontally in the vertical pipe, to do the same support, but can not bring additional pressure on the valve.

The same temperature in the working environment can only be between minus 30 and minus 60 °C, and the relative humidity can not exceed 95%. You will see that just before and after the regulating valve, there will be a straight pipe section whose length must exceed 10 times the pipe diameter, preventing the straight pipe section of the valve from being short and affecting the flow characteristics. When the valve diameter and process piping are different, different diameter pipes can be used for connection.

If a small-diameter pneumatic control valve is installed, it can also be connected using threads. The fluid direction arrow on the valve body is the same as the fluid direction. When setting the bypass pipe, it is completely possible to perform overhaul of the regulating valve without shutting down for the convenience of switching or manual operation. Of course foreign matter in the pipeline must be handled before installation.

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