Modular Self-Cleaning Filter

PJ‑R Series: Automatic backwashing by filtrate. Reverse flow from other filter units cleans the surface of filter elements.

PJ‑V Series: Automatic backwashing by external clean media. External liquid or gas is used to flush filter elements.

PJ‑T Series: Manual backwashing with filtrate.

PJ‑G Series: Manual backwashing with external clean fluid.

▶ Working Principle of Self-Cleaning
Liquid flows into the inlet manifold and then enters each filter unit. It passes through the filter elements from outside to inside, exits each unit, and converges into the outlet manifold for discharge. Particulate contaminants are trapped on the outer surface of filter elements and build up into filter cake.
When the differential pressure rises to the preset value (typically ___ kPa) or the cleaning cycle expires, the control system triggers backwashing. Each filter unit is backwashed sequentially. While one unit is under backwash, the rest keep filtering normally.
According to the backwash fluid source, two types are available: filtrate backwashing and external clean fluid backwashing. Details are as follows:

▶ Filtrate Backwashing
Filtration mode: Inlet & outlet valves open; backwash valve closed.

Backwashing mode: The control system closes the inlet valve of one filter unit and opens its backwash valve. Driven by the pressure difference between the filter element interior and the atmospheric backwash outlet, filtrate from other active units flows in reverse into this unit to flush away contaminants on the element surface. The waste is drained via the backwash manifold.
After backwashing, the backwash valve closes, and the inlet valve reopens to resume filtration. The cycle repeats sequentially until all filter units are backwashed.

Shanghai Luying Industrial Filtration Equipment Co., Ltd. is a professional company specializing in industrial filtration and separation technologies, providing filtration equipment, solid-liquid separation systems, filter elements, and customized filtration solutions to customers worldwide. Focusing on precision liquid filtration, contaminant removal, solid-liquid separation, automatic filtration, and air purification, we continuously develop our product portfolio to meet the filtration requirements of various industrial processes.

Our filtration equipment portfolio includes bag filter housings, cartridge filter housings, sanitary filters, microporous filters, titanium rod filters, deep membrane stack filters, automatic scraper filters, brushing and modular self-cleaning filters, diatomite filters, plate-type closed filters, candle filtration systems, filter presses, and solid-liquid separation equipment. We also provide supporting RO water treatment, automatic dosing, and air filtration equipment, covering applications from conventional precision filtration to continuous automatic filtration and complex solid-liquid separation processes.

In addition to filtration equipment, Luying Filtration supplies a comprehensive range of industrial filter elements and consumables, including filter bags, wedge wire screens, PTFE, PP, PES, PVDF, Nylon and fiberglass pleated cartridges, melt-blown cartridges, deep-wound cartridges, high-flow filter cartridges, stainless-steel pleated elements, sintered mesh and felt elements, powder-sintered elements, titanium filter elements, and other customized filtration components. By combining filtration equipment with suitable filter elements, we can provide product selection and customized solutions based on different media, filtration ratings, flow rates, pressures, temperatures, and material requirements.

Our products and solutions serve a wide range of industries, including chemical processing, petrochemical, food & beverage, pharmaceutical, water treatment, coatings & inks, fine chemicals, power generation, new energy, and industrial environmental protection. From application analysis and product selection to engineering design, manufacturing, quality inspection, and after-sales support, Luying Filtration is committed to delivering reliable products, flexible customization, and professional technical support, while building long-term partnerships with distributors, engineering companies, equipment manufacturers, and industrial end users worldwide.