Square Flap Valve – AQUIKO Non-Return Flow Control

The AQUIKO Square Flap Valve is designed to deliver efficient non-return protection in bespoke or large-format openings where standard circular valves may not suffice. Manufactured in the UK from high-density polyethylene (HDPE), this design ensures lightweight installation, low-head loss and excellent durability — making it a strong choice for contractors and resellers needing high-specification, stock-enabled solutions.

Key Features & Benefits

• UK-manufactured for consistent quality, rapid supply and trusted performance.

• HDPE construction — lightweight, corrosion-resistant, UV stable and suitable for high-performance applications.

• Customisable pressure ratings — each size is designed around a flexible pressure spec rather than a one-size rating.

• Low maintenance and low head-loss design — the lightweight material allows efficient operation and reduced operating costs.

• Ideal for contractors & resellers — standard sizes plus bespoke options cater to stock availability and project-specific demands.

Technical Specification Snapshot

• Material: High-Density Polyethylene (HDPE)

• Standard Sizes: Available in large square dimensions; bespoke sizes on request.

• Pressure Rating: Minimum of 6 m w.c. over 4 days, with some sizes rated for over 10 m w.c.

• Operation: Hinged flap door design allowing flow in one direction, closing under back-flow conditions

• Maintenance: Minimal — HDPE material resists degradation in water, the design reduces fouling risk and supports long service life

Typical Applications

The AQUIKO Square Flap Valve is especially well suited for:

• Large headwalls, culverts or outfall structures where square apertures are used

• Flood-defence installations requiring non-return protection in non-standard geometries

• Drainage and infrastructure projects where custom opening shapes or sizes are needed

• Contractor stock lines and reseller catalogues looking for standardised, high-specification non-return solutions

Why Choose AQUIKO Square Flap Valves

When you specify AQUIKO, you benefit from:

• UK manufacturing — ensuring fast lead-times, local support and streamlined logistics

• Quality materials — HDPE provides corrosion resistance, lightweight installation and long service life

• Stock availability — standard options ready for dispatch, plus the flexibility for bespoke designs

• Technical expertise — comprehensive drawings, datasheets, installation advice and support for both contractors and resellers

• Range coverage — part of a comprehensive flap valve range including wall-mounted, pipe-mounted and side-hung variants

Ordering & Availability

Standard square flap valve models are held in stock for UK dispatch, giving contractors confidence in availability and resellers the security of a manageable stock line. Bespoke sizes, pressure ratings or material changes are available on request. When ordering, please provide:

• Opening width and height (square aperture dimensions)

• Maximum back-flow or head pressure requirement

• Installation orientation, wall or headwall detail, and any special material or mounting needs

Fixing kits and ancillaries can be supplied to complete your project in one package.

Related Products You May Be Interested In

• Wall-Mounted Flap Valve – for face-mounted wall or headwall non-return applications

• Pipe-Mounted Flap Valve – for inline non-return protection within pipeline runs

• Side-Hung Door – for installations requiring door-style access and non-return protection

Talk to Our Team

Need help specifying the correct square flap valve for your project, or planning to stock this for resale?
01777 819 734
info@aquiko.co.uk