Flap gate(600) - List of Manufacturers, Suppliers, Companies and Products

Last Updated： Aggregation Period:Aug 13, 2025～Sep 09, 2025
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Flap gate Product List

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FRP flap gate

FRP flap gate

The emergence of a new gate that, thanks to the use of FRP materials, is resistant to seawater in addition to its traditional functions.

The "FRP Flap Gate" is a new gate that meets the needs of those in charge of water management facilities. By utilizing FRP materials, it is not only strong against seawater but also excels in economic efficiency, corrosion resistance, lightweight properties, construction efficiency, and operational efficiency, in addition to its conventional functions. 【Overview】 ■ Standard Specifications (Effective Cross Section) ・ 600×600mm to 2000mm×2000mm ■ Track Record ・ 1985: Over 50 gates in Abashiri, Hokkaido, and other locations ・ 1985: Over 80 gates in Nanjo, Okinawa Prefecture, and other locations *For more details, please refer to the PDF document or feel free to contact us.

  • Watergate

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Flap gate

Flap gate

Since it will be installed using all anchors, it can be easily installed on-site.

We would like to introduce the 'Flap Gate' handled by Inoue Iron Works Co., Ltd. Since it is installed using all anchors, it can be easily installed on-site. We offer various types, including the retrofitted "Simple Flap Gate" and the "Waterproof Flap Gate." Additionally, we manufacture products made of iron, stainless steel, and aluminum alloy. Furthermore, we also have band-type products available for cases where pipes such as fume pipes or cast iron pipes protrude from the wall. Please feel free to contact us. 【Product Lineup】 ■ Simple Flap Gate ■ Waterproof Flap Gate *For more details, please refer to the PDF materials or feel free to contact us.

  • others

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Anchor-type flap gate

Anchor-type flap gate

Just secure it with anchor bolts! It's easy to install on existing drainage outlets.

This product is an anchor-type flap gate that can be installed simply by securing it with anchor bolts to concrete structures. We offer two types of materials: aluminum alloy and stainless steel. It can be used for backflow prevention at various drainage outlets, from rivers to sewage systems and ports. 【Features】 ■ Easy installation suitable for tidal work ■ Excellent water tightness ■ Choice of materials according to application ■ Double hinge design ■ Average installation cost reduction of approximately 36% *For more details, please refer to the PDF document or feel free to contact us.

  • Drainage and ventilation equipment

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Aluminum alloy cast flap gate AGF type series

Aluminum alloy cast flap gate AGF type series

Lightweight, inexpensive, highly durable, easy to install and maintain!

Flap gates operate with even a small amount of water during drainage and respond sensitively and smoothly to differences in water levels inside and outside. They are required to maintain sufficient strength and functionality during backflow prevention. Additionally, designs and colors that match the environment are increasingly being highlighted as important factors for future gates. The "Aluminum Alloy Cast Flap Gate AGF Series" is installed at the end of drainage pipes (inlets) in rivers and flood walls for internal drainage purposes, automatically opening and closing due to differences in water levels, making it a valuable tool for backflow prevention gates. For more details, please contact us or refer to the catalog.

  • Airport facilities

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Anchor-type flap gate for backflow prevention and tide protection

Anchor-type flap gate for backflow prevention and tide protection

Just fix it to the concrete structure with anchor bolts! It opens and closes automatically with the difference in water level.

We handle "Anchor-type flap gates for backflow prevention and tide control." Double hinges are used in the hinge section, and P-type rubber is adopted in the watertight section to enhance water tightness. We offer two types: aluminum alloy and stainless steel, which can be used for backflow prevention at various drainage outlets from rivers to sewage systems and ports. 【Features】 ■ Suitable for tidal work ■ Easy installation ■ Excellent water tightness ■ Material can be selected according to application ■ Double hinges adopted ■ Automatically opens and closes with water level difference *For more details, please refer to the PDF document or feel free to contact us.

  • Watergate

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KM-type socket-equipped simple flap gate "KMGH model"

KM-type socket-equipped simple flap gate "KMGH model"

Fixed by covering the outside of the PVC pipe! Installed on the waterway side of the drainage pipe to prevent backflow during waterway flooding.

The "KMGH type" is a simple flap gate (backflow prevention valve) with a socket, installed on the waterway side of drainage pipes such as rainwater drainage pipes, to prevent backflow during rising water levels. Under normal conditions, it allows rainwater drainage to flow into the waterway, and during flooding, the flap gate closes to prevent backflow. Recently, there has been an increase in its use for drainage pipes installed on the parapet walls of rivers. It is also used to prevent odors and the entry of pests from drainage pipes. It is fixed by being covered over the outside of PVC pipes. For diameters 50 and 65, to prevent clogging, the connection diameter is the same as the nominal diameter, but the valve diameter is enlarged to 75mm. 【Features of KMGH Type】 ■ The main body is made of PVC ■ Convenient for easily installing a flap gate ■ The main body is covered over the outside of the PVC pipe and fixed with adhesive, making it useful for new installations ■ Compatible sizes range from 50mm to 600mm in diameter ■ Applicable water depth: up to 2m ■ It does not provide 100% watertightness *For more details, please refer to the PDF document or feel free to contact us.

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  • Piping materials (plastic pipes)
  • Watergate
  • Port supplies

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Socket-type flap gate [Backflow prevention valve: F1 type]

Socket-type flap gate [Backflow prevention valve: F1 type]

This is a socket-type flap gate that can be directly attached to PVC pipes!

This is a simple flap gate that is ideal for drainage channels and countermeasures against backflow during river flooding. It is an economical and easy-to-install standard product. 【Made of Synthetic Resin】 ◎ The door body is made of synthetic resin, making it lightweight and easy to open and close with minimal force. ◎ It does not use rubber, so maintenance is not required for a long time. 【Direct Installation on PVC Pipes】 ◎ It features a socket type for easy installation by simply inserting the PVC pipe. 【Rich Track Record】 ◎ It has been used for many years across the country. For inquiries or requests for various materials, please feel free to contact us at the following: 　　TEL: 052-444-4634 　　FAX: 052-441-7854 　　Email: web-inq@chububika.co.jp

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  • Concrete wall
  • Sanitary fixtures
  • Airport facilities

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Low cost! Stainless steel/Aluminum/Iron [Flap Gate: Type F8]

Low cost! Stainless steel/Aluminum/Iron [Flap Gate: Type F8]

Achieve low cost with simple design! Easy to install with a wide variety! A new standard for metal flap gates!

【Low Cost】 ◎ Achieve low cost with a simple structure! 【Rich Variations】 ◎ Available in three types: stainless steel, aluminum, and iron! ◎ You can choose between round and square shapes! ◎ Designs without door stops are also possible! ◎ Custom sizes can be designed to fit your site! (Up to width x height 1000mm) 【High Performance】 ◎ Double hinge design allows for smooth opening and closing! ◎ High water tightness ensured by using waterproof rubber! 【Easy Retrofit】 ◎ Simple installation with the included drive anchors!

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  • Sanitary fixtures

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Automatic closure only during flooding! 【Drain Flap Gate: F12F Type】

Automatic closure only during flooding! 【Drain Flap Gate: F12F Type】

It is usually open! It automatically closes during high water levels! This is a new concept "flap gate" that reduces drainage and garbage issues.

Always open type backflow prevention product [Drain Flap Gate] [Always Open Type] Being open most of the time means... ◎ High drainage capacity! ◎ Reduces the risk of debris getting stuck! [Backflow Prevention] ◎ Automatically closes when the external water level exceeds half the height of the door! [Easy to Open and Close with Little Force] ◎ The door body is made of lightweight reinforced plastic "FFU"! ◎ Double hinge mechanism allows for easy opening and closing with minimal effort! [Easy Post-Installation Type] ◎ Can be easily installed with post-installation anchors!

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  • Sanitary fixtures

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KM-style Simple Flap Gate Series for Backflow Prevention

KM-style Simple Flap Gate Series for Backflow Prevention

By installing it on the waterway side of drainage pipes such as rainwater drainage pipes, it prevents backflow during waterway flooding!

Features of Our Simple Flap Gate 1. The main body is made of PVC, making it convenient for easy installation of flap gates. 2. Being made of PVC, it is lighter and more affordable compared to metal products. 3. The KMGH and KMGC types are fixed with adhesive, making installation easy. 4. There are products available that correspond to three different installation methods to suit the site. For details on the lineup, please refer to the individual product pages. ■ KMG Type: A type fixed to the retaining wall with anchor bolts. It is installed to cover the discharge outlet, allowing use without being restricted by the shape of the outlet. The compatible size for the discharge outlet is up to 1,000mm square. ■ KMGH Type: A type that covers the outside of the PVC pipe. It is convenient for new installations. The compatible size ranges from a diameter of 50mm to 600mm. ■ KMGC Type: A type that is inserted and fixed inside the PVC pipe or flue pipe. It can be easily retrofitted to existing pipes. The compatible size ranges from a diameter of 75mm to 400mm. *For more details, please refer to the PDF materials or feel free to contact us.

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  • Watergate
  • River construction
  • Tensioning and connecting blocks

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Conventional design! Stainless steel/Iron [Square flap gate: F6 type]

Conventional design! Stainless steel/Iron [Square flap gate: F6 type]

Design can be tailored to water depth and size! This is a conventional flap gate that enhances construction efficiency and improves opening, closing, and water-stopping performance!

【High Workability】 ◎ The door stop and door body can be disassembled, reducing the burden of welding work! ◎ The installation of the door body can be done with standard tools! * A post-installation specification with embedded anchor fixation can also be designed. 【High Water Stopping and Opening/Closing Performance】 ◎ Adopting our unique double hinge mechanism for smooth opening and closing! ◎ Improved water stopping performance with water stopping rubber and smooth movement! 【Conventional Design Tailored to the Site】 ◎ Wide compatibility with various sizes and design water depths! * Please feel free to consult us regarding design conditions.

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  • Hoist/Crane

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Harbor flap gates (round type and square type) "F8HM type and F8HK type"

Harbor flap gates (round type and square type) "F8HM type and F8HK type"

Prevents backflow of external water during high tide! Stainless steel flap gate.

The harbor flap gate (round and square type) "F8 type" prevents external water from backflowing during storm surges. It adopts a double hinge design, achieving high water tightness and smooth opening and closing. The door and stops are made of SUS323L (equivalent to SUS316L), which is particularly resistant to seawater. The allowable wave height is equivalent to 6.0m (equivalent to a water depth of 30m). It comes with all-anchor theft prevention nuts (at two locations). 【Features】 ○ Double hinge design ○ Resistant to seawater ○ Easy installation For more details, please contact us or download the catalog.

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  • Sanitary fixtures

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