Specification

Duplex Filters in Multi-Media Stainless Steel/PP Filter

Introduction: The Core Component of Industrial Filtration Systems and Modern Challenges

In today’s industrial environment, filtration technology has become a critical tool for ensuring production efficiency, product quality, and minimal environmental pollution. Particularly in industries such as chemicals, petroleum, food and beverage, pharmaceuticals, and water treatment, the demand for multi-media filtration is growing, driving higher requirements for the reliability, precision, and automation of filtration equipment. Duplex filters, as core components of industrial filtration systems, meet the stringent needs for uninterrupted filtration and efficient cleaning in continuous production processes through their unique design and functionality.

As an innovator in industrial fluid control, NEWWAY integrates advanced valve technology with filtration processes to offer a series of duplex filter solutions. These solutions combine the latest advancements in materials science, mechanical engineering, and automation control technology, providing users with high-performance, easy-to-operate, and low-maintenance filtration systems. This article comprehensively explores the working principles, technical features, application areas, and selection criteria of NEWWAY duplex filters, serving as a professional reference for engineers and decision-makers.

I. Basic Concepts and System Composition of Duplex Filters

Duplex filters, also known as parallel switching filters, are precision filtration devices consisting of two parallel filter units. This design allows the system to perform filter cleaning or replacement without interrupting operations, significantly enhancing process continuity and reliability. Each filter unit is equipped with independent inlet/outlet valves and control units, enabling seamless switching through well-designed piping layouts.

NEWWAY duplex filters are based on a modular design philosophy and redundancy backup concept. The system primarily comprises the following key components:

Filtration Units: Typically cylindrical structures housing filter cartridges and support components. Each unit can independently handle the full filtration load, ensuring uninterrupted operation during maintenance.

Valve Systems: Include three-way ball valves, stop valves, and automatic drain valves, forming the core of fluid control. These valves work in precise coordination to enable flow path switching, backwash control, and media direction.

Filter Cartridges: Available in various materials and precision levels, including 304/316L stainless steel metal cartridges, PP cotton cartridges, PP pleated cartridges, and melt-blown cartridges, meeting needs from coarse to precision filtration.

Control Systems: Utilize PLCs (Programmable Logic Controllers) integrated with pressure sensors, timers, and human-machine interfaces (HMIs) for fully automated operation and status monitoring.

Structural Framework: Constructed from stainless steel (SUS304/316L), including bases, pipe connectors, and support structures, ensuring corrosion resistance and structural integrity in harsh industrial environments.

II. Working Principles and Precision Coordination with Valve Systems

The operation of duplex filters is based on parallel redundancy and differential pressure control. Under normal conditions, fluid enters the system through the inlet pipe and is directed to one of the filter units via a three-way ball valve. As the fluid passes through the cartridge, suspended particles and impurities are captured, while clean fluid exits through the outlet.

When accumulated impurities increase the differential pressure across the filter cartridge, sensors detect this change. Once the preset threshold (typically 0.05–0.1 MPa) is reached, the control system triggers the cleaning cycle. Here, the valve system plays a critical role:

Three-Way Ball Valves redirect flow to the parallel filter unit.

Drain Valves open automatically to discharge waste during cleaning.

Inlet and Outlet Valves coordinate to isolate the unit requiring maintenance.

The backwashing process uses clean fluid reverse flow technology, where clean liquid flows backward through the cartridge to dislodge and remove accumulated debris. This process typically takes only seconds, restoring the cartridge’s filtration capacity before the system resumes normal operation.