Junli engineers hydrodynamic automatic flood barriers that rise by water power alone — no electricity, no pumps, no staff on site. Since our first metro installation we have delivered flood protection systems to underground garages, rail transit stations, power substations, airports and civil-defence passages, and every design is proven in real typhoon-season water-retaining events, not only in the laboratory.
Passive trigger response once water enters the chamber
Sealed water-retaining rate verified in full-scale pool tests
Maximum standard retaining height per barrier leaf
Cities with installed metro, substation & garage projects
Purchasing managers should never buy flood defence on a rendering. Below are documented water-retaining events and factory water tests of Junli flood gates — the kind of proof we attach to every technical submission.
During Typhoon Bebinca, sites equipped with Junli floodgates blocked incoming surface water automatically — with no operator present and no power available.
Buoyancy and hydrostatic pressure raise and lock the panel. Zero energy consumption, zero standby cost, mechanical reliability for a 20-year service window.
Every model is pool-tested for lifting time, seal leakage and deflection under design head before shipment, with test reports issued per order.
Junli Technology Co., Ltd., headquartered in Qinhuai District, Nanjing, Jiangsu Province, is a Chinese high-tech enterprise dedicated to the R&D and manufacturing of intelligent flood control products for the construction and infrastructure industries. Our engineers work across four technology segments — intelligent civil defence, intelligent flood control, intelligent bridge and intelligent energy — which lets us solve the structural, sealing and drainage details that generic door factories miss.
We own the tooling, welding, sealing and water-test capability in-house, so retaining height, frame embedment and corrosion protection can be tailored to your local rainfall intensity, kerb geometry and traffic load.
Different entrances fail in different ways. Select the barrier family that matches your opening type, then request the dimensional drawing set for tendering.
Flush-mounted ramp protection for residential, hospital and mall car parks. Vehicles drive over it daily; it rises only when water arrives.
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Station entrances, connection channels and air shafts. Validated on rail transit lines in Guangzhou, Suzhou, Nanjing, Beijing, Shenzhen and Hong Kong.
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Perimeter gates and cable trench doors for power utilities, where a single flooding event can black out an entire district.
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Reference units with recorded flood-event performance — the fastest way to justify a specification to your client or insurer.
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Witness testing, leakage measurement and acceptance documentation available before and after installation.
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Light flip-up units, embedded-type frames, self-closing doors and replacement seal kits for maintenance programmes.
Browse all products →Filter by asset type to see comparable installations. Each project includes site survey, civil interface design, factory water test and commissioning.
Share the clear width, kerb level, design rainfall or historical flood depth of your entrance. Our engineering team returns a barrier selection table, embedment detail, drainage note and English acceptance-test procedure so your consultant can specify with confidence.
Flood defence is a life-safety and asset-protection product. These are the four checkpoints our overseas clients use to compare suppliers.
Documented water-retaining performance during typhoon and rainstorm events, covered by official Chinese media and rail-transit operators.
Dedicated flood-control R&D team, in-house sealing design, structural calculation and full-scale hydraulic verification pool.
Accepted by metro companies, state-grid substations, airports and civil-defence authorities under strict tender review.
Test reports, material certificates, installation manuals, maintenance schedule and spare-part list issued in English.
The barrier panel sits flush inside a recessed foundation chamber. Rising surface water enters the chamber and generates buoyancy plus hydrostatic pressure, which lifts and mechanically locks the panel in the retaining position. No power supply, sensor, pump or human intervention is required — so the gate still performs during the blackout conditions that typically accompany urban flooding.
Standard hydrodynamic units cover retaining heights of 0.5 m to 2.0 m, single clear spans up to 6 m, and multi-leaf arrays for driveway or station entrances over 20 m wide. Light flip-up models suit pedestrian doorways, cable trenches and equipment rooms. Custom sizing follows your site survey drawing.
Yes. Designs are validated in our own water-testing pool for lifting time, seal leakage rate and structural deflection at design head, and field records from installed projects are archived. Water-test videos, inspection reports and third-party witnessing can be arranged per order.
For embedded types, a reinforced-concrete chamber with embedded steel frame, a drainage outlet and a levelled kerb interface are required; we provide the embedment template, rebar clearance note and pouring sequence. Surface-mounted and flip-up models need only an anchored base plate, which makes them suitable for retrofit projects on operating assets.
We supply English installation and maintenance manuals, remote commissioning guidance, seal replacement kits and an annual inspection checklist. Engineer dispatch and operator training can be organised for large infrastructure contracts through our global service team.
Export packing, documentation, commissioning support and maintenance programmes for international flood-control projects.
Explore service →Technical articles on urban waterlogging, barrier selection, seal maintenance and flood-risk standards for buildings.
Read insights →The flood barrier and flood gate topics buyers search most — a fast index into our product and application library.
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