Curved Screens & Static Hydraulic Screens from TNW Co., Ltd — Source Manufacturer of Unpowered Fine Wastewater Barriers
For small sewage stations, food slaughterhouses, papermaking & printing plants and sand washing river treatment projects, motor-driven rotary bar screens are not always necessary for intercepting fine fibers, hair and suspended solids in pretreatment. Facilities with limited space, insufficient staff or tight budgets prefer unpowered curved screens and static hydraulic screens, which realize solid-liquid separation only by water gravity with zero power consumption and ultra-low failure rates.
Many cheap homemade curved screens and static screens on the market cut corners on plate thickness with irregular slots and rough welding, leading to frequent blockage, deformation and sludge leakage after short service life. Fine fibers pass through the screen and clog downstream screw presses and DAF units. TNW Co., Ltd specializes in manufacturing curved screens and static hydraulic screens with complete in-house production lines for laser stainless steel cutting, frame welding and hydraulic pressure testing. All equipment is self-produced without OEM outsourcing, featuring precise screens and reliable anti-corrosion performance, making us a cost-effective professional manufacturer of small and medium wastewater pretreatment interceptors.
1. Working Principles of Two Equipment Types for Accurate Model Selection
Curved Hydraulic Screens
Also known as hydraulic bar screens, they adopt concave wedge wire curved panels. Wastewater overflows evenly from the top distribution weir and flows tangentially along the curved surface. Water passes through precise slits while hair, pulp fibers, food residues and fine sediment are trapped on the screen and slide down to the bottom sludge hopper via hydraulic scouring. No motors or transmission parts are required for fully hydraulic self-cleaning operation.
Customizable slot width ranges from 0.1–3 mm for high filtration precision, covering single-unit throughput of 5–200 m³/h with low head loss and stable performance under fluctuating high flow rates.
Static Hydraulic Screens (Flat Static Screens)
With simpler inclined flat wedge wire panels, they filter naturally via water level difference. Impurities larger than slits stay on the inflow side for regular manual cleaning or optional spray flushing. Without curved surfaces, they occupy minimal space with adjustable installation angles, ideal for narrow channels, basement collecting wells and overflow outlets of small pump stations.
Standard slot width: 0.5–5 mm, designed for low-budget simple installation scenarios with large particle impurities and low fiber content, such as domestic sewage and light cleaning wastewater.
2. Core Structural Advantages of TNW Curved & Static Screens to Resolve Industry Pain Points
High-precision Wedge Wire Screens Resist Fiber Bridging & Blockage
Low-cost alternatives use punched plates with burrs that easily wind fibers. TNW adopts integrally welded wedge wire screens with narrow front and wide back profiles to prevent material adhesion. Minor low-pressure flushing restores permeability and drastically cuts manual cleaning frequency. Laser positioning cutting controls slit tolerance within ±0.05 mm for over 93% stable interception efficiency and zero fine sludge leakage into downstream processes.
Tiered Full Stainless Steel Anti-Corrosion Frames for Custom Working Conditions
Standard 304 stainless steel model (mainstream choice): Thickened 304 stainless steel frames, screens, distribution weirs and sludge hoppers with passivated anti-rust welds, suitable for municipal sewage, food slaughter and sand washing neutral wastewater with over 8 years of service life.
Premium 316L stainless steel anti-corrosion model: Upgraded 316 stainless steel screens and wetted components to resist acid/alkali corrosion from printing and pickling wastewater, ideal for coastal high-salinity facilities without perforation or rust penetration under long-term immersion.
Economical lined carbon steel model: Epoxy anti-corrosion carbon steel frames with 304 stainless steel screens for temporary construction sites and short-term renovation projects with lower procurement costs.
Unpowered Zero Energy Consumption to Slash Operation Costs
Compared with rotary mechanical bar screens, curved and static hydraulic screens eliminate motors, gearboxes, chains and rakes, removing common failure risks such as burnt motors, derailed chains and worn bearings.
No electricity fees during long-term operation with very few wearing parts (only screens and spray nozzles), requiring almost no spare part replacement within 3–5 years. Perfect for unattended small wastewater stations without full-time operators.
Optional Auxiliary High-Pressure Spray Self-Cleaning for Oily & Fibrous Wastewater
For high-viscosity impurity wastewater from printing and slaughterhouses, matching high-pressure spray assemblies can be installed to flush grease and cotton lint off screens without disassembly. Flushing water flows back to the front tank to avoid random wastewater discharge and meet environmental compliance standards.
3. Applicable Scenarios for Each Model
Recommended Projects for Curved Hydraulic Screens
Papermaking, chemical fiber and printing wastewater for pulp & cotton fiber recovery and reduced downstream COD load
Food processing, slaughter and prefabricated food plants to intercept meat residues, grease and food scraps
Sand washing plants and river dredging slurry pretreatment for fine sediment separation
Medium and industrial wastewater facilities with 24-hour continuous fluctuating inflow
Sites requiring automatic sludge discharge and reduced manual cleaning for fiber recycling
Suitable Scenarios for Static Hydraulic Screens
Basement collecting wells of residential communities and small township integrated sewage stations
Small catering pretreatment and laboratory cleaning wastewater
Old channel renovations with extremely limited installation space
Intermittent production with short daily runtime and tight budgets
Pump station overflow outlets and simple pre-filtration for water plant intakes
4. Complete Matching with Full TNW Wastewater Equipment Line
As front-end pretreatment equipment, curved screens and static hydraulic screens can be paired with TNW rotary fine bar screens, DAF units, TNW series screw presses and integrated PAM dosing units.
Wastewater undergoes preliminary fine solid interception before flotation and sludge dewatering, greatly lowering clogging risks and chemical consumption of downstream equipment. General contractors purchasing complete pretreatment lines receive pre-calibrated process parameters at the factory, enabling quick commissioning after on-site pipeline connection without repeated debugging across multiple suppliers.
5. Direct Factory Supply Benefits: Transparent Quotations & Comprehensive After-Sales Service
Most curved and static screens on the market are resold by distributors with non-standard screens, incompatible spare parts and delayed after-sales support. TNW’s strengths as an original manufacturer:
Full in-house production: Laser-processed screens pass full hydraulic testing before delivery, with no thin plates or simplified welding.
Customizable channel width, slit size and installation angle; full-size stock for 5–200 m³/h throughput with short lead times.
Detailed quotations clearly list plate thickness, slit specifications, spray accessories and warranty coverage with no hidden delivery or installation surcharges.
Complete contractual after-sales commitments: Free pre-sales on-site channel surveys and model recommendations based on water quality & flow; nationwide technicians for on-site installation, commissioning and routine maintenance training; 12-month warranty on stainless steel screens and spray components, with genuine spare parts supplied long-term at factory cost.
Practical Selection Tips to Avoid Mismatch & Budget Waste
Prioritize curved screens for wastewater rich in fiber and hair; flat static screens are more prone to winding and clogging.
Upgrade to 316L stainless steel screens for coastal or chemical pickling wastewater, as 304 material suffers rapid corrosion under long-term acid/alkali exposure.
Equip curved screens with automatic spray self-cleaning systems for 24-hour continuous high-flow inflow to cut manual workload.
Choose static hydraulic screens for space-limited intermittent production with limited budgets for optimal cost performance.
Send wastewater samples to TNW for free lab testing to confirm the precise slit size if unsure.
Conclusion
With core advantages of zero power consumption, low failure rates and minimal operation costs, curved screens and static hydraulic screens serve as highly cost-effective fine pretreatment solutions for small and medium wastewater facilities. Cheap shoddy non-standard screens lead to heavy hidden expenses from frequent clogging, sludge leakage and screen replacement, far exceeding initial price gaps.
TNW Co., Ltd professionally manufactures curved screens and static hydraulic screens featuring high-precision panels, reliable anti-corrosion performance and complete specifications, applicable to papermaking, food, printing, municipal and sand washing wastewater pretreatment. They are ideal for new wastewater projects and replacement of outdated simple interceptors.
Share your channel width, daily throughput and wastewater type with our technical team for free customized selection plans and detailed factory quotations.