Aquatic Control Engineering

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Fish Friendly Flapvalves

All our Fish Friendly Flapvalves have been tested and designed in conjunction with Southampton University, with over 100 Fish Friendly Flap valves installations in the last two years with no losses and failures it is clear that ACE have a robust and reliable fish product.

Fish Friendly HDPE Flap Valve - Reset Type (Tidal)

Bespoke Product

This is the unique reset style Flapvalve, ideal for tidal applications. This flapvalve utilises patented WaStop technology to give enhanced control of fish passage. The design has been tested and verified by Cranfield University.

Side Hung Door HDPE Flap Valve

Bespoke product

Side hung flapvalves are ideally suited for larger culverts and offer an increase opening aperture for the migration of larger fish. This style of flapvalve is also ideal for installations with a low rate of flow.

Flap Valve Balancer (retro fit solution)


The flap balancer has been designed to allow existing flapvalves to comply with fish migration regulations. It is suitable for Flap valves unto 1.5m. If a large flap is in use multiple flap balancers can be fitted for valves over 1.5m. The hold load can be adjusted after installation. The flap balancer Utillises ultra strong Neodymium magnets which do not lose magnetic force and has robust stainless steel 316 construction Supplied complete with fixing and setup guide

Fish Friendly HDPE Flap Valve - Non Tidal

Bespoke product

This is based on ACE's Original design for the fish friendly flapvalve and is the result of many years of testing and refinement. The design is full adjustable to optimise the migration time without compromising the function of the flapvalve. ACE's Fish Friendly Flap valves are tested and verified by both Cranfield University and the University of Southampton. This has led to an evolution and refinement of the design.