Fernco Double Flap Backwater Valve

The Fernco Double Flap Backwater Valve, is specifically engineered to offer enhanced protection against backwater flooding. This valve is installed within drainage systems to facilitate the unidirectional flow of sewer or surface water while effectively preventing the reverse flow during flood conditions. It plays a crucial role in safeguarding buildings from the risks associated with rainwater backflow in sewerage systems.

• Dual Flap Mechanism: Equipped with two flaps, it provides an added layer of security against backflow, particularly in high-risk flood areas or in systems with high backflow pressure.
• Automatic and Maintenance-Free: The valve functions automatically and is designed to be maintenance-free, minimizing the need for regular upkeep.
• Robust Construction: Made with durable materials, including stainless steel flaps, to ensure long-term functionality and resistance to wear.
• Easy Inspection and Operation: Features a removable lid for convenient inspection and an easy-to-operate locking mechanism.
• Pest Prevention: Acts as an effective barrier against rodents and other pests, enhancing the overall safety and hygiene of the building.
• Compliance with Standards: Fully meets the safety and quality standards set out in BS EN 13564.

• Size Availability: Suitable for common PVC pipe sizes including 110mm, 160mm, and 200mm diameters.
• Material Composition: Stainless steel flaps and a specially designed body to reduce the risk of blockages.
• Safety Testing: Comprehensively tested for safety, adhering to BS EN 13564 standards.

The Fernco Double Flap Backwater Valve is designed for easy installation in drainage systems:

1. Strategic Placement: Install the valve in a section of the drainage system where it can effectively prevent backflow.
2. Correct Orientation: Ensure the valve is positioned to allow wastewater to flow in the intended direction, blocking reverse flow.
3. Accessible for Maintenance: Although maintenance-free, it should be installed in a location where the lid can be removed for inspections if necessary.

The choice between a single flap and a double flap backwater valve largely depends on the specific requirements of the drainage system. A double flap valve is often necessary in situations where:

• Higher Backflow Risk: In areas prone to severe flooding or in systems that face high backflow pressures, the double flap provides enhanced protection.
• Increased Reliability: The additional flap offers an extra layer of security, ensuring that even if one flap fails, the other can still prevent backflow.
• Complex Drainage Systems: In more intricate or larger-scale drainage systems, a double flap valve can offer better performance and reliability.