How does a hydrodynamic automatic flood barrier work without electricity?

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.

What retaining heights and clear widths can Junli supply?

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.

Are the flood gates tested with real water before delivery?

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.

Do you support overseas installation and after-sales service?

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.

Top search

Flood Barrier
Automatic Flood Barrier
Flood Barrier
Automatic Flood Barrier For Metro Stations
Self-Closing Flood Gate For Subway Entryways
Embedded Flood Control System For Underground Stations
Modular Flood Defence Equipment For Metro
Foldable Flood Protection Equipment In China
Surface Type Flood Baffles For Entryways
Flood Barrier s
Pop-Up Flood Gate s In China
High Quality Automatic Flood Door For Substations
Self-Closing Flood Barrier For Garages
Embedded Flood Control System For Metro
Solid Flood Barrier For Subway Stations
Surface Type Flood Gate Equipment s
Flip-Up Flood Protection Device For Garages
Automatic Flood Baffles Solutions
Self-Closing Flood Barrier For Entryways
Embedded Flood Barrier Device For Garages
Foldable Flood Defence Device For Metro Stations
One-Stop Automatic Flood Protection Solutions
Self-Closing Flood Barrier Equipment Companies
Embedded Flood Gate Device For Underground Stations
Foldable Flood Protection Equipment For Substations
High Quality Flood Barrier
Pop-Up Flood Barrier For Subway Entryways
One-Stop Flood Protection Solutions For Underground Stations
Solid Flood Door Device For Substations
Self-Closing Flood Protection Device For Garages
Automatic Flood Barrier For Subway Stations
Self-Closing Flood Barrier Equipment For Metro Entryways
Embedded Flood Barrier Device For Underground Stations
Modular Flood Barrier Solutions For Garages
Foldable Flood Barrier Equipment For Substations
Flood Barrier s For Metro Stations
Pop-Up Flood Barrier s For Subway Entryways
Surface Type Flood Barrier For Underground Stations
High Quality Automatic Flood Barrier For Entryways
Self-Closing Flood Barrier Device For Garages
Automatic Flood Gate Exporters
Self-Closing Flood Gate Equipment s
Foldable Flood Gate Equipment Wholesale
Flood Gate s For Metro Stations
High Quality Pop-Up Flood Gate s
Surface Type Flood Gate For Underground Stations
One-Stop Automatic Flood Gate For Entryways
Self-Closing Flood Gate Equipment For Garages
Automatic Flood Baffles Device For Subway Stations
Self-Closing Flood Baffles s
Embedded Flood Baffles Device For Metro
Solid Modular Flood Baffles For Garages
Foldable Flood Baffles In China
High Quality Flood Baffles s
Pop-Up Flood Baffles Device For Subway Entryways
Surface Type Flood Baffles Wholesale
One-Stop Automatic Flood Baffles Solutions For Metro
Self-Closing Flood Baffles Equipment For Garages
Automatic Flood Barrier Without Electricity
Mechanical Self-Closing Flood Barrier From China
Non-Electric Automatic Flood Barrier s
Foldable Automatic Flood Barrier s
Surface Type Automatic Flood Barrier
Pop-Up Automatic Flood Barrier Device
Flip-Up Automatic Flood Barrier Without Electricity
Automatic Flood Gate Without Electricity
Mechanical Self-Closing Flood Gate Equipment
Non-Electric Automatic Flood Gate s In China
Foldable Automatic Flood Gate Without Electricity
Non-Electric Surface Type Automatic Flood Gate
No-Electricity Pop-Up Automatic Flood Gate
Flip-Up Automatic Flood Gate Without Electricity
Automatic Flood Baffles Device Without Electricity
Mechanical Self-Closing Flood Baffles s
Non-Electric Automatic Flood Baffles In China
Non-Electric Surface Type Automatic Flood Baffles
Automatic Flood Baffles Without Electricity
Flip-Up Automatic Flood Baffles Without Electricity
Flood Door
Flood Gate
Floodgates
Flood Control Device
Flood Defence
Flood Solution
Automatic Flood Door
Automatic Flood Gate
Automatic Floodgates
Automatic Flood Defence
Automatic Flood Control Device
Self Closing Flood Barrier
Self Closing Flood Door
Self Closing Flood Gate
Self Closing Floodgates
Self Closing Flood Defence
Self Closing Flood Control Device
Flip Up Flood Barrier
Flip Up Flood Door
Flip Up Flood Gate
Flip Up Floodgates
Flip Up Flood Defence
Flip Up Flood Control Device
Flood Door
Flood Gate
Flood Control Device
Flood Defence
Flood Solution
Automatic Flood Barrier
Automatic Flood Door
Automatic Flood Gate
Automatic Floodgates
Automatic Flood Defence
Automatic Flood Control Device
Self Closing Flood Barrier
Self Closing Flood Door
Self Closing Flood Gate
Automatic Flood Device
Automatic Water Baffle
Automatic Flood Door Without Electricity
Automatic Flood Device Without Electricity
Automatic Flood Defence Without Electricity
Automatic Flood Barrier Without Personnel On Duty
Automatic Flood Gate Without Personnel On Duty
Automatic Flood Door Without Personnel On Duty
Automatic Flood Device Without Personnel On Duty
Automatic Flood Defence Without Personnel On Duty
Modular Flood Gate
Modular Flood Barrier
Modular Flood Door
Modular Flood Device
Modular Flood Defence
Flood Gates For Vehicles Passing
Flood Barrier For Vehicle Passing
Quick Dam Flood Barrier
Flood Barrier For Building
Flood Protection Quick Dam
Flood Barrier For Home
Flood Barrier For Subway
Flood Barrier For Metro
Flood Barrier For Garage
Flood Control System
Flood Prevention Systems
Flood Protection Barrier Systems
Flood Stop Devices
Flood Control Devices
Flood Protection Device
Automatic Water Retaining Device
Self Closing Automatic Flood Gate
Self Deploying Flood Barrier
Flood Barrier Gate
Water Activated Flood Barrier
Quick Dam Automatic Flood Barrier
Automatic Flood Barrier For Building
Automatic Flood Barrier For Home
Automatic Flood Barrier Gate
Automatic Flood Barrier For Metro
Automatic Flood Barrier For Garage
Self Deploying Automatic Flood Barrier
Self Closing Automatic Flood Barrier
Entryway Automatic Flood Barrier
Flood Proof Automatic Flood Barrier
Water Fence Barrier
Barrier For Flood
Flood Protection
Water Flood Barrier
Steel Flood Barrier
Flood Control Barrier
Flood Gate Systems
Flood Barrier Panel
Anti Flood Gate
Door Flood Barrier
Immediate Flood Protection
Flood Control
Quick Dam Flood Barriers
Self-Deploying Flood Barrier
Self-Closing Flood Barrier
Automatic Flood Control Barrier
Self Closing Flood Protection Barrier
Self Closing Flood Barrier For Building
Self Closing Flood Barrier For Home
Self Closing Flood Barrier For Subway
Self Closing Flood Barrier For Metro
Self Closing Flood Barrier For Garage
Self Closing Flood Barrier For Substation
Entryway Self Closing Flood Barrier
Automatic Self Closing Flood Barrier
Self Closing Flood Barrier Gate
Passive Flood Barrier
Passive Flood Barrier For Buildings
Automatic Passive Flood Barrier
Self-Deploy Passive Flood Barrier
Self Closing Passive Flood Barrier
Flood Proof Passive Flood Barrier
Hydrodynamic Flood Barrier
Automatic Hydrodynamic Flood Barrier
Hydrodynamic Flood Barrier For Building
Hydrodynamic Flood Barrier For Home
Hydrodynamic Flood Barrier For Metro
Hydrodynamic Flood Barrier For Garage
Hydrodynamic Flood Barrier For Substation
Self Deploy Hydrodynamic Flood Barrier
Self Closing Hydrodynamic Flood Barrier
Flood Protection Hydrodynamic Flood Barrier
Automatic Water Activated Flood Barrier
Water Activated Flood Barrier For Home
Water Activated Flood Barrier For Metro
Water Activated Flood Barrier For Building
Water Activated Flood Barrier For Garage
Self Closing Water Activated Flood Barrier
Flood Barriers
Inflatable Flood Barrier
Flood Water Barriers
Inflatable Water Barrier
Durable Inflatable Flood Barrier
Convenient Portable Inflatable Water Barrier
Movable Flood Control Barriers
Flood Protection Baffles
Ramp Flood Control Panel
Type Flood Gate Used For The Garage Home
Water Barrier
Instant Flood Water Barrier
Inflatable Dams
Door Plastic Flood Control
Mobile Flood Protection Barrier
Aluminum Flood Barrier
Home Flood Barrier
Flood Protection Home Water Control Barrier
Flood Barrier Door Dam
Flood Prevention Barrier
Aluminum Flood Prevention Barrier
Flood Barrier Wall
Home Quick Dam
Aluminum Flood Control Barrier
Home Use Aluminum Door Protection Flood Barrier
Aluminum Door Protection Flood Barrier
Flood Barrier For Household
Stops Water Flood Barrier
Inflated Flood Barrier
Quick Dam Water Activated Barrier
Quick Dam
Flood Barrier Door
Lift-Out Flood Barrier For Residential Building
Flood Control Plates For Garages
Aluminium Flood Gate Barrier
Flood Barrier For Doors
Portable Flood Barrier
Plastic Water Barriers
Stainless Steel Flood Barrier
Easy Install Stainless Steel Flood Barrier
Stainless Steel Flood Barrier For Flood Defence
Flood Dam Gate
Aluminum Flood Gate Barrier
Flood Barrier Inflatable
Flood Barrier Aluminum
Flood Obstacle Sand Bag
Flood Gate For Subway
Sandbags For Flooding
Flood Aluminum Barrier Inflatable
Prevention Control Flood Barrier Aluminum Gate
Preventing Flood Bag
Water Activated Flood Bags
Water Activated Barrier
Flood Gate For Building
Flood Gate For Metro
Flood Gate For Garage
Flood Defence System
Flood Defence Equipment
Flood Gate For Home
Self Deploying Flood Gate
Flood Gate Barrier
Aluminum Flood Gate
Flood Gate For Flood Defense
Quick Dam Flood Gate
Entryway Flood Gate
Floodgate
Floodgate For Building
Floodgate For Garage
Aluminum Floodgate
Foldable Floodgate
Floodgate For Home
Self Closing Floodgate
Self-Closing Floodgate
Self-Deploying Floodgate
Self Deploying Floodgate
Automatic Floodgate
Quick Dam Floodgate
Quick Dam Self Closing Flood Door
Self Closing Flood Door For Home
Self Closing Flood Door For Building
Self Closing Flood Door For Metro
Self Closing Flood Door For Garage
Self Closing Flood Gate For Home