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Multi-core Self-cleaning Strainer
1 Product Overview
Multi-core Self-cleaning Strainer is a pressure-bearing fully automatic differential pressure backwash filter. Multiple stainless steel wedge wire elements are installed in parallel inside vessel. Fluid flows from inner to outer of filter elements, solid contaminants trapped on inner surface. As sludge accumulates, inlet-outlet DP rises to preset value and triggers cleaning cycle. Gear motor drives rotating backwash jib to target each element sequentially. Reverse flow generated by pipeline pressure strips contaminants for blowdown. Only one element is cleaned at a time while others keep working, enabling continuous inline operation without shutdown.
Different from single-core brush/suction self-cleaning filters, parallel multi-element design provides much larger filtration area and higher maximum throughput. Targeted backwashing delivers superior performance on viscous and fibrous contaminants, ideal for large-flow circulating water systems with high suspended solids and fluctuating water quality.
2 Main Structural Composition
Pressure Vessel AssemblyEpoxy coated carbon steel / SUS304 / SUS316L vertical/horizontal tank with flanged nozzles and inspection manhole.
Multiple Metal Filter Element AssemblyStandard 316L wedge wire elements; optional multi-layer sintered cartridge.
Rotary Backwash MechanismGear drive motor, transmission shaft, positioning system, backwash jib and sealing suction nozzle set.
Blowdown Valve AssemblyPneumatic or electric drain valve synchronized with cleaning sequence.
Intelligent PLC Control SystemDP transmitter, position sensor, operation panel with remote signal output & fault alarm.
Support BaseSteel frame ensuring stable vertical or horizontal installation.
Complete Sealing AssemblyEPDM / FKM gaskets resisting long-term hydraulic pressure and medium corrosion.
3 Working Principle
Filtration ModeFluid enters raw water chamber and distributes evenly into each filter element. Water permeates outward through element slots. Solid particles larger than nominal rating are retained on inner wall; clarified water collects in clean chamber and flows downstream via outlet.
Backwashing ModeFilter cake builds up and raises differential pressure. When DP reaches set threshold or timing cycle expires, automatic cleaning starts:Drive motor rotates jib and precisely aligns with the first element, blowdown valve opens. Pressure difference between inside vessel and atmosphere generates reverse flow to scour off contaminants, which are discharged through drain pipeline.After finishing one element, jib rotates to next element and repeats until full cycle completes. Main pipeline flow remains uninterrupted during whole procedure, then filter returns to normal filtration mode.
4 Basic Technical Parameters
Applicable medium: industrial cooling water, surface water, reclaimed water, process water, low-viscosity neutral & mildly corrosive fluidHousing material: Q235 coated carbon steel, SUS304, SUS316L, 2205 duplex stainless steelElement material: 316L wedge wireDesign 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 / manual forced cleaningNominal size: DN100 ~ DN1200Installation: vertical / horizontal optionalBackwash duration per element: 15～60s adjustableMax operating pressure drop: ≤0.09MPaBackwash water consumption: ≤0.8% of total flow
5 Core Product Advantages
Element-by-element backwashing maintains continuous flow, suitable for non-stop production systems.
Parallel multi-element layout offers large filtration area and high throughput with compact footprint for equal flow rate.
V-shaped wedge wire slots provide better anti-clogging performance than plain woven mesh for fiber and sludge laden raw water.
DP-driven backwashing requires no auxiliary cleaning pump, reducing auxiliary equipment investment.
No disposable filter consumables; reusable metal elements cut long-term operation cost.
Targeted concentrated backwashing thoroughly removes sludge and inhibits persistent filter cake formation.
Vertical and horizontal configurations available to match pump room height and piping layout.
Fully automatic intelligent operation supports remote integration for unattended management.
Versatile material options applicable to fresh water, brackish water and chemical circulating medium.
Modular components with high interchangeability for convenient spare parts procurement.
6 Installation, Commissioning & Maintenance Specification
Install strictly following flow marking; keep vertical unit upright and horizontal unit level.Reserve minimum 5×DN straight pipe sections at inlet & outlet to stabilize flow field. Isolation valves and bypass are recommended for offline maintenance.A coarse strainer upstream is advised to prevent heavy foreign objects damaging filter elements.Flush internal welding debris before initial water filling. Set cleaning DP, single-element duration and cleaning interval parameters during commissioning.Regularly inspect motor operation, valve actuation and DP variation trend. During annual overhaul, check element abrasion and gasket aging.Run a full backwash cycle and drain residual water before long-term shutdown to avoid sludge hardening and element corrosion.
7 Common Faults & Solutions
DP rises rapidly with increased cleaning frequencyCauses: excessive inlet suspended solids; damaged filter element; failed upstream pretreatmentSolutions: add upstream coarse filter; inspect and replace defective element; optimize front-end water treatment
DP cannot recover after backwashing, insufficient cleaning efficiencyCauses: leaking suction nozzle seal; solidified viscous contaminants; insufficient blowdown flowSolutions: replace suction nozzle seal; extend single-element cleaning time; unclog blowdown piping
Jib positioning deviation, cannot align with elementCauses: faulty position sensor; excessive transmission clearance; abnormal reducer motorSolutions: calibrate or replace sensor; adjust shaft clearance; overhaul drive motor
Blowdown valve fails to open or closeCauses: power/air supply fault; debris jammed in valve trim; abnormal control signalSolutions: check power & air source; disassemble and clean valve; inspect wiring and control module
Leakage at vessel flange & manholeCauses: aged gasket; uneven bolt tension; damaged sealing surfaceSolutions: install new gasket; tighten bolts diagonally; rework sealing face
8 Standard Supply List & Optional Accessories
Standard Supply List
Pressure vessel, wedge wire element set, rotary backwash assembly, drive motor, automatic blowdown valve, PLC control cabinet, DP monitoring unit, inlet & outlet flanges, support base, complete sealing set, flow direction nameplate, operation manual.
Optional Accessories
Explosion-proof electrical package, remote DP transmitter, local touch screen, steam heat tracing jacket, inspection manhole, sanitary mirror polishing, ANSI standard flange, remote digital signal module。
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