SCREENGUARD
™
INSTALLATION AND USER MANUAL
7
DESCRIPTION
Filter Operation - General Description
The Filtration Process
Water enters the filter through the inlet [1] and passes through the strainer [7] from the outside in. The
strainer is designed to protect the cleaning mechanism from large dirt particles (The strainer is not cleaned
automatically).
The water then flows through the screen filter [6] from the inside out to the outlet [2]. The entrapped
particles form a "filtration cake" which accumulates on the screen inner surface. Over time the "cake"
build-up increases the pressure differential across the screen, and at a pre-set value (0.5 bar; 7 PSI) the
automatic self-cleaning cycle begins.
The Self-Cleaning Process
The self-cleaning process utilizes the backflush technique to effectively remove the dirt particles from the
screen. The automatic flushing cycle takes 10-30 seconds and does not interrupt the supply of process
water.
As water flows from the inlet through the strainer and screen to the outlet, at a pre-set pressure
differential (0.5 bar; 7 PSI) the flush controller [8] activates the hydraulic piston [3] and opens the flushing
valve [14].
The pressure in the hydraulic flushing turbine [5] chamber drops, creating suction at the flushing nozzle [11]
tips. The water and particles passing through the hydraulic flushing turbine cause the suction assembly
[10] to rotate, while the hydraulic piston [3] moves the suction assembly in an axial motion to the opposite
end of the filter. The combination of rotational and axial motion of the suction assembly ensures that the
suction nozzles sweep the entire inner surface of the screen.
When the first backflush stroke is completed, the flushing valve [14] closes, and after a very short
interval the second backflush stroke is hydraulically triggered and the flushing valve reopens. The suction
assembly [10] rotates, moving with the piston in the opposite direction and returning to its original position.
The ScreenGuard™ screen filter series are hydraulically operated units. No external power source is
required. This type of control enables operation at remote installation sites.
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