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Horizontal Self-cleaning Filter
1 Product Overview
Horizontal Self-cleaning Filter is a pressure-bearing fully automatic mechanical filter. Medium flows horizontally straight into the cylinder. Contaminants are trapped on the inner side of metal screen while clarified water flows horizontally to outlet. When dirt buildup raises differential pressure between inlet and outlet, control system activates cleaning cycle. Drive motor rotates brush/suction assembly to sweep screen surface; blowdown valve opens simultaneously to discharge sludge. Filtration remains continuous without shutdown.
Different from vertical self-cleaning filters, horizontal layout fits low-headroom pump rooms and skid-mounted systems. Compared with bag & security cartridge filters, it requires no frequent element replacement. Ideal for large-flow continuous filtration with high suspended solids load, widely used for cooling water and raw water pre-treatment pipelines.
2 Main Structural Composition
Horizontal Pressure Vessel AssemblyEpoxy coated carbon steel / SUS304 / SUS316L horizontal cylinder with flanged inspection end cover.
Metal Filter Screen Assembly316L wedge wire screen, stainless woven mesh or perforated cartridge according to required rating.
Automatic Cleaning MechanismDrive motor, transmission shaft, brush / suction assembly for full inner screen sweeping.
Automatic Blowdown ValvePneumatic or electric drain valve synchronized with cleaning cycle.
Intelligent Electric Control SystemPLC cabinet, DP transmitter & pressure switch with alarm and remote signal output.
Support BaseIntegrated steel frame ensuring stable horizontal installation.
Sealing AssemblyAge-resistant rubber / FKM gaskets to prevent vessel leakage.
3 Working Principle
Raw water enters horizontally and permeates outward through screen. Solid particles larger than nominal rating are trapped on inner screen surface; clean water flows toward downstream pipeline.Contaminant cake gradually increases inlet-outlet differential pressure. When DP reaches preset limit or timing cycle expires, self-cleaning sequence activates:Motor drives cleaning unit rotating axially to strip accumulated sludge; blowdown valve opens to discharge impurities under pipeline pressure.Blowdown valve closes upon cycle completion, filter resumes normal filtration. The whole process runs automatically in loops; manual override mode is available on demand.
4 Basic Technical Parameters
Applicable medium: industrial cooling water, surface water, groundwater, reclaimed water, neutral & mildly corrosive process waterHousing material: Q235 coated carbon steel, SUS304, SUS316L, 2205 duplex stainless steelScreen material: 316L wedge wire, stainless woven meshDesign pressure: 1.0MPa / 1.6MPa; custom high pressure up to 2.5MPaOperating temperature: 5～80℃ (max 95℃ with heat tracing)Available filtration rating: 20μm, 50μm, 100μm, 200μm, 500μm, 1000μm, 3000μmControl mode: DP control / timer control / manualStandard size: DN80 ~ DN800Installation: horizontal inline flanged mountingBlowdown water consumption: ≤1% of main flowSingle cleaning duration: 10～180s adjustableMax pressure drop: ≤0.08MPa
5 Core Product Advantages
Straight horizontal layout facilitates pipeline arrangement, preferred for low-height pump rooms and skid packages.
On-line automatic cleaning with uninterrupted flow to sustain continuous production.
Rigid metal screen delivers long service life without recurring filter element expenditure.
Multiple control modes supported for remote linkage in automated factories.
Low blowdown volume saves water and reduces long-term operation cost.
High dirt loading capacity extends cleaning intervals and cuts frequent blowdown operations.
Versatile material selection suitable for fresh water, seawater and chemical circulating water.
Thorough mechanical sweeping prevents persistent cake clogging.
High integration and compact footprint enable easy on-site installation.
Built-in fault alarm assists operators to identify abnormal conditions timely.
6 Installation, Commissioning & Maintenance Specification
Install strictly horizontally following flow marking. Maintain minimum 5×DN straight pipe sections upstream & downstream to minimize turbulence.A coarse strainer is recommended upstream to avoid heavy debris damaging screen. Install isolation valves and reserve access space for maintenance.Flush internal welding residues before initial water filling. Set cleaning differential pressure, cycle duration and blowdown delay parameters during commissioning.Routinely inspect electric signals, motor noise and valve actuation status. During annual overhaul, check screen abrasion and gasket aging.Run full cleaning cycle and drain all residual water before long-term shutdown to avoid sludge hardening and screen corrosion.
7 Common Faults & Solutions
DP rises rapidly with increased cleaning frequencyCauses: excessive inlet suspended solids; damaged screen; failed upstream pretreatmentSolutions: add upstream coarse filter; repair or replace screen; optimize front-end water treatment system
DP cannot recover after cleaning, insufficient screen cleaning effectCauses: excessive clearance caused by worn brush; sticky filter cake; insufficient blowdown flowSolutions: adjust or replace cleaning brush; extend cleaning duration; unclog blowdown piping
Blowdown valve fails to open/closeCauses: power / air supply fault; debris stuck in valve trim; abnormal control signalSolutions: check power & air source; disassemble and clean valve; inspect DP switch and control wiring
Flange leakage at vessel jointCauses: aged gasket; uneven bolt tension; damaged sealing surfaceSolutions: install new gasket; tighten bolts diagonally; rework sealing face
Cleaning motor abnormal noise & overload alarmCauses: foreign object jamming screen; misaligned transmission shaft; insufficient lubricationSolutions: open inspection cover and remove bulk debris; correct shaft concentricity; replenish lubricant regularly
8 Standard Supply List & Optional Accessories
Standard Supply List
Horizontal pressure vessel, metal screen assembly, cleaning drive unit, automatic blowdown valve, PLC control cabinet, DP monitoring assembly, inlet & outlet flanges, support base, complete sealing set, flow direction nameplate, operation manual.
Optional Accessories
Explosion-proof electrical package, remote DP signal transmitter, local touch screen, steam heat tracing jacket, sanitary mirror polishing, ANSI standard flange, remote signal output module。
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