Stainless steel metal cartridges can be categorized into two types: flat cartridges and pleated cartridges. Here is a comparison highlighting the differences between these two types of stainless steel metal cartridges.
I. Flat Stainless Steel Metal Cartridges
1. The filtration principle employed in this type of metal cartridge is surface filtration.
2. Direct interception serves as the cartridge's filtering mechanism. Direct interception means that particles in the oil remain within the flow stream until they are intercepted by the surface of the stainless steel filter or an internal orifice smaller than the particles. The stainless steel screen captures particles on the upstream side, while smaller particles pass through the stainless steel screen along with the oil flow. The plain weave stainless steel screen has regular and uniform orifices, and when partially blocked by larger particles, smaller orifices are formed, which can also capture some smaller particles.
3. Due to the fine filter mesh being directly applied to the skeleton, the flat cartridge has a relatively large size to ensure an ample filtering area.
II. Pleated Stainless Steel Metal Cartridges
1. The design of pleated cartridges is based on the utilization of flat cartridges combined with practical requirements. A pleated cartridge consists of a filter material (stainless steel filter mesh) shaped into a cylinder with a specific folding distance, allowing for maximum effective filtering area within the limited form factor. The cartridge contains a metal skeleton that can withstand the liquid pressure resulting from the pressure difference.
2. The pleated cartridge adopts an overall single folding structure, with the oil flowing into the stainless steel cartridge from the outside. The transition from a flat to a pleated stainless steel filter increases the fine filter area by over two times while maintaining the same shape as the flat cartridge. Generally, the area is increased by 2-3 times, with an oil flow rate not exceeding 0.02m/s when passing through the screen.
3. Characteristics of the pleated filter element:
(1) The filtering area is 2-3 times larger than that of the flat cartridge. The increased screen area reduces initial pressure loss, increases dirt holding capacity, and extends the usage time under the same working conditions.
(2) The manufacturing process is simple and convenient, requiring less specialized tooling and resulting in lower processing costs compared to flat cartridges.
(3) The fine filter is protected on both the inside and outside, reducing the likelihood of damage during non-use.
(4) Disassembly and cleaning are easy.
(5) The overall filter element has high strength and can withstand large pressure differentials, meeting national standards.
(6) The oil passage capacity is approximately three times the normal flow of the system, reducing pressure loss significantly and extending cleaning cycles.
(7) The pleated cartridge can be reused after undergoing ultrasonic cleaning.
Through a comparative analysis of flat stainless steel cartridges and pleated cartridges, the technical advantages of the pleated cartridges are evident. Additionally, despite using less material (specifically, the fine filter mesh) compared to pleated cartridges, flat cartridges are more complex and time-consuming to manufacture. However, the overall cost remains lower for flat cartridges. Replacing flat cartridges with pleated cartridges is highly suitable as it better meets user requirements, improves cartridge lifespan without increasing costs, and aligns with national standards.
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