AF series Bernoulli Self-cleaning Filter

Product Description

LIVIC AF Series Automatic Bernoulli Filter

Brief Introduction

The AF series Automatic Bernoulli Filter is designed for continuous filtration of water in pressurized systems. Automatic Bernoulli Filter removes debris and particles from natural water sources such as sea water or river water. The Automatic Bernoulli Filter works in BERNOULLI principle, which leads to the simple and highly reliable filtering operation.

BERNOULLI Cleaning Principle

The filter element of Automatic Bernoulli Filter is cleaned by the cleaning disc mounted on the pneumatic cylinder rod. When the cleaning action triggered, the disc moves into the filter element and water passes through the gap between the disc and the filter element. Flow velocity increases around the disc and the static pressure around the disc decreases because of the Bernoulli principle. Around the disc edge, the vacuum effect of lower static pressure makes the filtered water back-flush the filter element surface.

Technical Features and Advantages

Simple and reliable structure with only two moving parts (Clean disc and discharging valve)

Non-contact cleaning, no particle extrusion out of the filter element, efficient filtration

Low and consistant pressure drop (even < 0.011MPa) both when clean and dirty

Very low working pressure requirement down to 0.03MPa

Wide flow rate range from 30 to 7000 m3/ h in only one filter unit

No filtration interruption when self-cleaning

Filtration sizes from 0.1 to 2 mm

Easy installation in horizontal or vertical position

Typical Application Fields

Typical applications: water treatment, circulating cooling system, heat exchanger protection, spraying nozzle protection, ballast water treatment system

Applicable liquids: underground water, sea water, lake water, river water, circulating cooling water,sewage water, process water, cleaning water

The Complete Working Stages of Automatic Bernoulli Filter

Stage 1. Filtration in the upper 2/3 screen In the lower 1/3 reverse flow takes place as a result of high flow velocities in the filter screen entrance. This causes no impurity deposit. 

Stage 2. Filtration in progress The screen starts to gradually get clogged from top to down. Filtration also begins in the 1/3 screen. Reverse flow in the screen entrance area still takes place

Stage 3. Filtration and self-cleaning action triggered 2/3 upper screen gets almost clogged Filtration starts on the whole screen surface The self-cleaning action is triggered by differential pressure

Stage 4. Cleaning and filtration The cleaning discharging valve opened The clean disc keeps still in the initial position The coarse particles are easily washed out of the filter The lower 1/3 screen also takes part in the filtration 

Stage 5. Cleaning and continuous filtration The cleaning disc moves down into the screen (down to 2/3) Cleaning takes palce on the screen surface around the disc because of the BERNOULLI principle

Stage 6. the disc moves up and down and cleaned the upper 2/3 screen Reverse flow takes place and cleans the lower 1/3 screen Particles are flushed out. The whole screen is cleaned

Automatic Bernoulli Filter Specification