Flap Valves – High-Performance Non-Return Solutions

At AQUIKO, we supply a comprehensive range of high-quality flap valves engineered for robust flood-defence, drainage and sewer applications. Designed to prevent reverse flow and ensure reliable operation, our flap valves deliver dependability in demanding UK environments. Whether you need wall-mounted, pipe-mounted, side-hung or bespoke units, you’ll find the right solution here.

Why Choose AQUIKO Flap Valves

• Proven reverse-flow prevention — our flap valves are designed to close quickly and effectively under back-pressure, reducing flood risk and protecting infrastructure.

• Corrosion-resistant materials — using marine-grade finishes and precision fabrication, we deliver valves that perform in harsh conditions and stand the test of time.

• Minimal maintenance — large opening angles and flush design components ensure debris is less likely to cause jams, giving you lower lifetime costs.

• UK-focussed availability — with AQUIKO as part of Aquatic Control Engineering, we stock standard sizes and custom options right here in the UK, supporting fast delivery and local service.

• Bespoke capability — if your project demands unusual dimensions, unique mounting or specific materials (e.g., stainless steel 316), our custom flap valve service has you covered.

Our Flap Valve Product Range

Browse by configuration:

• Wall-Mounted Flap Valve — ideal for mounting on outfalls, culverts or headwalls where a standard plate solution fits easily.

• Pipe-Mounted Flap Valve — designed for insertion into pipes, enabling end of line non-return protection for drainage or sewer systems.

• Side-Hung Door Flap Valve — perfect for providing a fish friendly solution to flood defence.

• Square Flap Valve & Custom Variants — for bespoke projects, larger openings or special materials requirements.

Installation & Service Considerations

When specifying a flap valve, please consider:

• Minimum required opening angle – ensuring full flush out of debris and achieving the fastest response on closure (studies show larger opening angles reduce head-loss and improve performance).

• Material choice – if your installation is coastal or in chemically-aggressive environment, ask us about stainless steel 316 options for enhanced corrosion resistance.

• Finish, flange type and access requirements – integration with your headwall or pipework should be seamless; our team will advise on custom modifications and site-fit details.

• Maintenance access – our designs require minimal maintenance.

Why AQUIKO & Aquatic Control Engineering

As part of Aquatic Control Engineering, AQUIKO benefits from decades of experience in flood-defence systems, fish-passage friendly design and robust hydraulic engineering. That means your flap valve isn’t an off-the-shelf item alone, but part of a broader system supported by engineering, service and UK logistics.

Ready to specify your flap valve? Get in touch with our sales team today for:

• Stock availability and lead-times

• Bespoke sizing and materials

• Support with specification, drawings and installation advice
  01777 819 734 | info@aquiko.co.uk