Pneumatic filters remove contaminants from compressed air streams, preventing damage to pneumatic devices and ensuring product quality. They are commonly used in conjunction with other air treatment devices and downstream filters, and are found in many industries and applications.
A pneumatic filter is a type of filter designed specifically for use in a compressed air stream. Filters are devices used to remove contaminants from a liquid or gas stream. Pneumatic filters remove contaminants, especially solid particulates, from fluid streams in the form of compressed air. They are frequently used in sequence with secondary filters which trap even smaller particles which escape the primary filters.
Pneumatic devices are tools, instruments or components that pressurize air or are operated by the force of compressed air passing through them. Some common examples of air tools are pneumatic spray guns used in spray painting and nail guns that fire nails at very high speed. The air brakes used by heavy vehicles such as buses and semi-trailers are also pneumatic devices. All of these devices require proper airflow to function reliably.
Contaminants in these and other devices can partially or completely block the airflow, thereby degrading device performance or causing failure. Hard particles propelled rapidly through such a device collide with internal surfaces as they move, eating away at the materials of which the device is constructed. Some particles can lodge inside the device thereby blocking the flow of fluid through the device, reducing its efficiency or causing it to fail. If particles manage to pass through, they can also damage or degrade the quality of a product produced by the device.
A wide variety of contaminants can damage pneumatic devices. Dirt, dust, pollen or mold from the environment in which the device is operating can get inside. Particles of the lubricant intended to protect the device or water vapor in the air that passes through it are also potential contaminants. Scale or rust that develops on the utensil as it ages can also break free and find its way into the air stream.
To keep pneumatic devices functional and reliable, it is necessary to prevent such contaminants from entering them. A pneumatic filter is a type of device that prevents particles from entering tools through the flow of compressed air passing through them. Other air treatment devices such as regulators and lubricators can be used in conjunction with a pneumatic filter as part of a filter-regulator-lubricator unit. In applications that are particularly sensitive to humidity, a pneumatic filter can be used as part of a separator-filter-drier unit to ensure that the required air quality is maintained. One or more additional filters can also be used downstream of a pneumatic filter to capture particles smaller than those filtered by the primary filter.
There are many industries and applications where a pneumatic filter is used. Such filters are commonly found in pneumatic tools and spray guns used in building construction, for example. Industrial and automotive plant applications incorporate pneumatic filters to prevent contamination both of products during production and into the products themselves for protection during use. Even sensitive facilities such as cleanrooms and food processing facilities typically use pneumatic filters to minimize pollutants in their operations.
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