Question 1

How does a hydrodynamic automatic flood barrier work without electricity?

Accepted Answer

The barrier panel is housed flush inside a recessed foundation chamber. Rising surface water flows into the chamber and generates buoyancy plus hydrostatic pressure, which lifts and locks the panel into the retaining position. No power supply, sensors, pumps or human operation are required, so the gate still works during a blackout — the exact moment most urban floods occur.

Question 2

What retaining heights and clear widths can Junli supply?

Accepted Answer

Standard hydrodynamic units cover retaining heights from 0.5 m to 2.0 m, with single clear spans up to 6 m and multi-leaf arrays for driveway or station entrances above 20 m. Light flip-up models are available for pedestrian doorways and equipment rooms.

Question 3

Are the flood gates tested with real water before delivery?

Accepted Answer

Yes. Every design is validated in our own water-testing pool for lifting time, seal leakage rate and structural deflection, and typhoon-season field records from installed projects are documented. Third-party inspection reports and water-retaining test videos can be issued with each shipment.

Question 4

Do you support overseas installation and after-sales service?

Accepted Answer

We provide civil-works drawings, embedded-frame templates, remote commissioning guidance, spare seal kits and English installation and maintenance manuals. Engineer dispatch for large infrastructure projects can be arranged through our global service team.

7 Best Flood Door Suppliers for Global Buyers in 2026

China Top Flood Barrier Manufacturers How to Choose?

Why Use These Core Keywords for Global Sourcing?