LFB Series Stainless Steel Security Filter
Introduction:LFB series stainless steel security filter, also known as cartridge filter housing, is widely deployed in the pretreatment section of water treatment systems. It is commonly matched with high flow filter cartridge, water filter housing to trap fine suspended particles and impurities, protecting RO, UF, NF and other membrane elements from particle damage. It delivers stable fine filtration for industrial water, food & beverage, pharmaceutical and semiconductor purification projects.
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Product Introduction
This LFB stainless steel security filter adopts high-quality 304 or 316L stainless steel shell. As a versatile water filter housing that supports various filter elements including high flow filter cartridge, it features light weight, large filtration area and fast flow rate with low risk of clogging. It accepts 10" to 40" filter cartridges of different types: PP melt-blown cartridges, pleated filter cartridges, string-wound cartridges, activated carbon cartridges and more. It is generally installed upstream of pressure vessels to remove fine particles above 1 NTU, or placed at the terminal of water treatment lines to guard finished water quality. It is most frequently installed after multi-media filters and before reverse osmosis and ultrafiltration membranes, intercepting tiny quartz sand, activated carbon fines and residual contaminants. The available filtration precision ranges from 0.5μm to 100μm for flexible selection according to process requirements. Three mainstream structural styles are optional: clamp type, flange type and flange with swing arm.
Working Principle
Liquid enters the stainless steel housing and flows through the filter cartridge made of polypropylene melt-blown or other filter media under pressure. Solid sediments, suspended solids, rust, colloids and bacteria are retained on the outer surface of the filter media, while the clarified filtrate permeates through the cartridge core and flows out from the outlet. When the pressure difference rises to the set value, users replace the internal filter cartridge to restore filtration performance.
Technical Parameters
| General Specification | Parameter |
|---|---|
| Working Pressure | 0.1–0.6 MPa |
| Working Temperature | 20℃–80℃ |
| Seal Type | O-ring & flat gasket |
| Seal Material | Nitrile rubber, silicone, fluororubber |
| Connection Type | Thread, flange |
| Compatible Cartridge | Flat end, 222 / 226 insert cartridges |
| Surface Treatment | Mirror polishing, electrolytic polishing |
| Filtration Rating | 0.5μm ~ 100μm |
| Shell Material | SS304, SS316L, carbon steel |
| Model | Matched Cartridge | Inlet & Outlet | Dimension | Wall Thickness | Structure | Cartridge Qty | Cartridge Length | Flow t/h |
|---|---|---|---|---|---|---|---|---|
| LFB-1-5X | LFB-15X | DN25 | Φ219×700 | 2mm | Flange | 5 | 10" | 1.5 |
| LFB-2-5X | LFB-25X | DN32 | Φ219×1000 | 2mm | Flange | 5 | 20" | 3 |
| LFB-3-5X | LFB-35X | DN40 | Φ219×1200 | 2mm | Flange | 5 | 30" | 5 |
| LFB-4-5X | LFB-45X | DN50 | Φ219×1500 | 2mm | Flange | 5 | 40" | 7 |
| LFB-4-10X | LFB-410X | DN65 | Φ325×1550 | 2.5mm | Flange | 10 | 40" | 15 |
| LFB-4-15X | LFB-415X | DN80 | Φ377×1600 | 3mm | Flange | 15 | 40" | 22 |
| LFB-4-20X | LFB-420X | DN80 | Φ426×1650 | 3mm | Flange | 20 | 40" | 30 |
| LFB-4-25X | LFB-425X | DN100 | Φ450×1700 | 3mm | Flange | 25 | 40" | 40 |
| LFB-4-30X | LFB-430X | DN100 | Φ500×1750 | 3mm | Flange + Swing Arm | 30 | 40" | 45 |
| LFB-4-35X | LFB-435X | DN100 | Φ550×1800 | 3mm | Flange + Swing Arm | 35 | 40" | 55 |
| LFB-4-45X | LFB-445X | DN125 | Φ600×1850 | 3mm | Flange + Swing Arm | 55 | 40" | 85 |
| LFB-4-50X | LFB-450X | DN125 | Φ650×1900 | 3mm | Flange + Swing Arm | 61 | 40" | 90 |
| LFB-4-60X | LFB-460X | DN125 | Φ700×1950 | 3mm | Flange + Swing Arm | 73 | 40" | 110 |
| LFB-4-65X | LFB-465X | DN150 | Φ750×2000 | 4mm | Flange + Swing Arm | 85 | 40" | 125 |
| LFB-4-70X | LFB-470X | DN150 | Φ800×2050 | 4mm | Flange + Swing Arm | 91 | 40" | 135 |
| LFB-4-80X | LFB-480X | DN150 | Φ900×2100 | 5mm | Flange + Swing Arm | 121 | 40" | 180 |
| LFB-4-100X | LFB-4100X | DN200 | Φ1000×2150 | 5mm | Flange + Swing Arm | 131 | 40" | 195 |
Core Advantages
1. High pressure resistance, efficiently removes suspended solids, rust particles from liquid streams
2. Wide range of compatible filter cartridges for diversified fluid filtration requirements
3. Compact footprint, large filtration area, low flow resistance and long service life
4. Excellent acid and alkali resistance, compatible with various chemical solvents
5. Consistent pore size, high filtration accuracy, high strength and high temperature resistance
6. Large dirt holding capacity, high throughput and low pressure drop
7. Clean cartridge material, no secondary contamination to process fluid
8. Economical initial cost and low operation cost; easy maintenance and fast cartridge replacement
Application Scenarios
NF, UF, RO, EDI system security filtration and terminal polishing filtration
Pharmaceutical industry: injection, infusion, eye drops, herbal liquid extraction & purification
Electronics & semiconductor: ultrapure water pretreatment and final filtration
Oilfield reinjection water, boiler feed water, high-purity chemical reagent filtration
Purified drinking water, mineral water, fruit juice, tea and beverage filtration
Wine, beer, yellow wine sterilizing filtration, non-pasteurization beer filtration
Wastewater treatment and water reuse pretreatment & safety filtration
Bioengineering, oil refining, textile printing and dyeing, lab fluid filtration
FAQ
Q1: What is the function of a security filter?
A: It acts as a guard filter to capture fine particles, protecting expensive downstream membrane elements from physical damage.
Q2: What kinds of cartridges fit this stainless steel filter housing?
A: PP melt blown, pleated, string wound and activated carbon cartridges with flat, 222 or 226 end adapters are all supported.
Q3: What’s the difference between 304 and 316L housing?
A: 316L offers better corrosion resistance and suits brackish water, seawater and chemical fluid conditions.
Q4: How to select the filtration micron rating?
A: 5μm or 1μm is most common for RO protection; 0.22μm / 0.45μm is used for sterile beverage and pharmaceutical filtration.
Q5: When do we need to replace filter cartridges?
A: Replace cartridges when the differential pressure reaches 0.3–0.4 MPa or flow rate drops significantly.
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