Automatic Scraping Self-Cleaning Filters for Continuous Liquid Filtration

Automatic scraping self-cleaning filters are designed for continuous liquid filtration where solids must be removed from the process stream without frequent manual cleaning or shutdown. Process fluid passes through a cylindrical screen element, where suspended particles are retained on the screen surface. As solids build up and differential pressure increases, an internal scraper mechanism cleans the screen in place, allowing accumulated debris to be discharged through a short drain or flush cycle.

This design is well suited to applications with regular or predictable solids loading, especially where conventional basket strainers or bag filters would require frequent operator attention. Scraping self-cleaning filters can help reduce downtime, minimise manual handling, protect downstream equipment, and maintain more consistent flow through the filtration system.

Monarch Industrial Products supplies automatic scraping self-cleaning filters for a wide range of industrial liquid applications, including water, process liquids, resins, adhesives, oils, coolants and other compatible fluids. Units are available in standard and high-pressure designs, with model selection based on flow rate, pressure, viscosity, filtration degree, solids loading and process conditions.

Where Scraping Self-Cleaning Filters Are Used

Typical Applications

Automatic scraping self-cleaning filters are commonly used where liquids contain solids that would otherwise block manual strainers, bag filters or cartridge filters. Typical applications include:

• Process water filtration
• Cooling water and heat exchanger protection
• Spray nozzle protection
• Paints, coatings, resins and adhesives
• Oils, coolants and lubricants
• Chemical process liquids
• Wastewater side-stream filtration
• Food, beverage and industrial process liquids, subject to material compatibility
• Pump, valve and downstream equipment protection

When to Use a Self-Cleaning Scraper Filter

A scraping self-cleaning filter should be considered when:

• Manual basket or bag cleaning is too frequent
• Solids loading is steady or predictable
• Process downtime needs to be reduced
• Operators need to avoid regular exposure to process fluids
• Flow needs to remain more consistent during operation
• The fluid is too viscous or difficult for conventional disposable filter media
• Downstream equipment requires ongoing protection from suspended solids

For applications with very low solids loading, a standard basket strainer, bag filter or cartridge filter may still be the most economical solution. For applications with high solids loading, abrasive solids or unusual process conditions, filter sizing and model selection should be reviewed carefully.