A dual hydraulic filter, also known as a duplex or double filter system, is designed to ensure continuous filtration of hydraulic fluid even when one filter element becomes clogged or needs maintenance. The working principle of a dual hydraulic filter involves two main components: the primary and secondary filters, which operate in parallel. Here's how it works:
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Parallel Operation: In a dual hydraulic filter system, there are two filter elements (primary and secondary) that work in parallel. This means both filters can handle the full flow rate of the hydraulic fluid simultaneously.
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Primary Filter: The primary filter is the first line of defense against contaminants. It captures larger particles and debris from the hydraulic fluid as it passes through.
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Secondary Filter: The secondary filter serves as a backup and provides additional filtration. It typically has a finer mesh than the primary filter, capturing smaller particles that the primary filter might miss.
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Pressure Differential: As the primary filter becomes clogged with captured contaminants, its flow resistance increases, causing a pressure differential between the inlet and outlet of the primary filter. This pressure differential is monitored by a pressure gauge or sensor.
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Bypass Valve: When the pressure differential reaches a predetermined threshold, indicating that the primary filter is significantly clogged, a bypass valve opens. This valve redirects the hydraulic fluid directly to the secondary filter, bypassing the primary filter.
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Continuous Filtration: While the primary filter is being cleaned or replaced, the secondary filter continues to provide filtration, ensuring that the hydraulic system remains operational without interruption.
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Maintenance: Once the primary filter is cleaned or replaced, the bypass valve is closed, and the primary filter resumes its role in the filtration process. The secondary filter can then be cleaned or replaced during a scheduled maintenance period.
This dual configuration ensures that there is always a clean filter available to maintain the integrity of the hydraulic fluid, preventing damage to hydraulic components and maintaining system efficiency.
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