amiad Filtomat MG110, Installation, Operation And Maintenance Instructions

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MG110
910101-000571 / 12.2019 Page 9 of 31
Introduction
General Description
The
FILTOMAT MG110
is a sophisticated, yet easy-to-operate automatic filter, with a self-cleaning mechanism driven by a hydraulic
turbine. It is designed to work with various types of screens in filtration degrees from 500 to 80 micron, and is available in 10"
inlet/outlet diameter.
The
FILTOMAT MG110 filter is configured to meet your specific needs according to flow rates and water quality. The filter can be
installed as a stand-alone unit for low flow rates, or assembled in a group on a manifold when high flow rates and/or a large screen
area are required. The filters are delivered fully assembled, requiring simple connections to the inlet and outlet, and to the drain.
Basic Filter Operation
Water enters the filter from the inlet pipe, and passes through a coarse screen, which protects the automatic cleaning mechanism from
any large particles or debris. The coarse screen is not cleaned automatically, and should not accumulate large quantities of solids. The
water then flows through a fine screen which filters out the smaller particles. Water that has passed through the fine screen is clean
and passes into the outlet pipe. Particles of dirt accumulate on the fine screen and form a “filtration cake,” which starts to restrict
water flow. As the restriction, or clogging, increases, the pressure in the outlet pipe becomes lower than in the inlet pipe. When the
pressure differential reaches a pre-set value, a self-cleaning cycle is initiated. The self-cleaning cycle takes approximately 45 seconds
and does not interrupt the flow of water through the filter.
How the Self-Cleaning Cycle Works
At a preset pressure differential (0.5 bar —7 psi), which is detected by a pressure differential switch, the flushing controller operates
pulse solenoids which allow water to flow to the relay valves, which then activate the hydraulic pistons and open a valve to the rotor
chamber (See Figures 2 below). The water from the rotor chamber flows out the drain. The pressure in the rotor chamber drops,
releasing a strong flushing stream that flows through the filter.
This drop in pressure and corresponding release of the backflush stream create a suction effect at the nozzle inlets. This effect actuates
spot cleaning directly in front of the openings of each nozzle at the inner side of the fine screen. The water and particles passing
through the hydraulic rotor cause the suction scanner to rotate, and the piston moves in an axial direction to the opposite end of the
filter.
The combination of rotational and axial movement of the suction scanner assembly ensures that the nozzles sweep the entire inner
side of the fine screen in a spiral pattern.
When the first stroke is completed, the flushing valve closes and after a short interval the flushing controller activates the second
backflush stroke. The suction scanner assembly spins, moving with the piston in the opposite direction and returning to its original
position.
This self-cleaning process takes about 45 seconds, depending on the operating pressure.
It is essential that there be at least 2 bar pressure at the inlet to the filter for proper cleaning to take place during flushing.
The flushing controller may be operated by pressure differential, manual activation, or by timer.