The Fernco (previously known as Flexseal) Non-Return Valve (NRV), is designed to allow free flow of sewer or surface water in the direction of the system's mains while preventing backflow in events like flooding. This valve is essential for protecting homes, commercial buildings, and infrastructure from the risks associated with sewage backflow and flooding, making it a crucial component in modern drainage systems.
Key Features
Flood Prevention: Acts as an effective barrier against foul water backflow from blocked sewerage systems.
Rodent Deterrent: Equipped with a stainless steel reinforced flap that blocks rats and other rodents from entering through pipes.
Simple Installation: Offers a quick, push-fit installation into existing manholes, requiring no specialist expertise or equipment.
Unobtrusive Design: Designed to be unobtrusive once installed, maintaining the natural flow of the drainage system.
Maintenance-Free: Requires no regular maintenance, ensuring long-term reliability and effectiveness.
Specifications
Size Range: Suitable for DN100 and DN150 pipes.
Material: Made from Polypropylene and 430 Stainless Steel with TPE components.
Temperature Range: Capable of withstanding temperatures from -50°C to 80°C continuously, and up to 100°C intermittently.
Standards Compliance: WRc Approved, meets BS EN 681-1:1996, BS EN 1852-1:2018, BS EN 10088:1995, BS EN 13564-1:2002, and BS EN 13564-2:2002.
SKU
Fernco Code
Nominal Diameter (mm)
Size (mm)
484670
NRV100
100
97 - 106
484671
NRV150
150
148 - 153
How and Where to Install a Non-Return Valve
Installation of the Fernco Non-Return Valve involves the following steps:
Safety Precautions: Ensure safety when opening an inspection chamber or manhole, which may require two people due to the weight of the manhole cover.
Determine Flow Direction: Once the manhole cover is lifted, identify the direction of flow, typically by flushing a toilet in the property.
Select Installation Points: Install Non-Return Valves on each of the flow pipes from the property, avoiding the outlet of the chambers.
Prepare Pipes: Clean the incoming pipes of any debris.
Insert the Valve: Wear gloves and push the NRV into the pipe inlet mouth. Use pipe lubricant sparingly if required.
Correct Positioning: Ensure the valve flap is positioned downwards and the hinge pivot point is horizontal.
Unlock for Use: Make sure the locking mechanisms are unlocked for normal operation.
Downloads
Fernco Non-Return Valve Datasheet
Fernco Non-Return Valve Installation Guide
If you require any further information, our excellent customer service team is here to help so please call us on 01794 835835.
