What are the respective functions of the outer protective mesh and inner support frame of HYDAC filter elements?

The outer protective mesh and inner support frame are key structural components of HYDAC filter elements. They work in tandem with filter media and perform distinct functions to ensure stable operation under hydraulic conditions.

The outer protective mesh is usually made of woven metal and wraps around the filter media. Its primary role is physical protection. It blocks large hard debris such as welding slag and metal chips in pipelines from impacting and scratching the media, preventing damage and fiber shedding of glass fiber or metal filter materials. It also evens out oil flow to enable fluid to pass through the entire filter surface steadily, avoiding scuff damage caused by excessive local flow velocity and preventing wrinkled media from loosening and deforming under oil pressure. Additionally, it shields the whole structure from bumps during installation, removal and transportation.

The inner support frame is generally a perforated metal cylinder fitted inside the filter media, mainly designed for pressure bearing and support. As fluid flows from outside to inside during operation, a pressure difference builds up across the element. The frame bears the pressure exerted on the media and stops fine glass fiber layers or sintered media from collapsing and blocking flow passages under hydraulic pressure. For high-pressure lines and applications with frequent pressure pulsations, it greatly enhances structural strength, resists alternating loads and prevents media delamination and end cap debonding.

To sum up, the outer mesh focuses on external protection and flow guidance, while the inner frame undertakes pressure bearing and shape retention. During routine maintenance, replace the filter element promptly if the mesh is deformed or the frame is bent, even if the media remains intact. This prevents structural failure that may lead to pipeline blockage or contaminant leakage.