Fernco Wall Mounted Flap Valve

• Mounting: Wall-mounted (FV Series)
• Size Range: DN100 – DN1000
• Material: High-Density Polyethylene (HDPE) with 316 Stainless Steel components
• Seal: Integrated EPDM (BS EN 681-1:1996 compliant)
• Pressure Rating: Up to 7 mwc (metres water column)
• Cracking Head: From 22 mm to 48 mm (varies by size)
• Standards: Exceeds DIN 19569-4, BS7775, ISO 9001:2015
• Installation Kit: Includes A4 stainless steel bolts and chemical anchor capsules
• Max Temperature Range: -30°C to 130°C
• Recommended Max Temperature: 80°C (constant), 100°C Intermittent

Designed to offer robust backflow protection, this HDPE wall-mounted flap valve provides a highly reliable and cost-effective solution for non-return drainage systems. Engineered for easy installation and exceptional durability, it helps prevent water ingress from external sources like rising floodwaters, estuaries, and tidal conditions. Manufactured from high-density polyethylene, the valve resists corrosion and environmental degradation, delivering long-term performance with minimal maintenance. Suitable for pipe sizes from DN100 to DN1000, it incorporates an EPDM co-extrusion seal for a watertight fit, removing the need for tapes or grouts during installation.

• Prevents backflow and protects against flood risks
• Manufactured from corrosion-resistant HDPE
• Lightweight construction for safer, faster installation
• EPDM co-extrusion seal for leak-free performance
• Requires no additional sealing materials
• Up to 60-year life expectancy with proper maintenance
• Wall-mounted design – ideal for surface installations
• Resistant to UV, chemicals, impact, and marine exposure
• Secure and tamper-proof due to no scrap value of materials
• Fully recyclable and environmentally safe

*Dimension taken from the back of the wall plate to front plate strengthening ribs.
**These values are taken from the top of the lifting bracket.

Important: Ensure the pipe end is flat and the wall surface is structurally sound and clean. The flap valve must be mounted with the hinge positioned at 12 o’clock.

Tools & Materials Required

• Drill with appropriate masonry bit (M8 bolts require 10mm bit; M12 bolts require 14mm)
• Chemical resin capsules (included with mounting set)
• Stainless steel A4 (316) bolts and washers (included)
• Torque wrench
• Spirit level
• PPE (gloves, goggles, etc.)

Mounting Set Contents (per size range)

• DN100–300: M8 capsules and bolts
• DN400 and above: M12 capsules and bolts

Step-by-Step Instructions

1. Positioning - Hold the flap valve against the wall at the desired installation point, with the hinge at the top (12 o’clock). Use a spirit level to ensure correct alignment.
2. Marking - Mark the drill points through the pre-formed mounting holes on the backplate.
3. Drilling - Remove the valve and drill into the wall using the appropriate drill bit. Drill to the recommended depth (80mm for M8, 100mm for M12).
4. Hole Preparation - Clean all dust and debris from the holes and the wall surface to ensure a secure bond with the resin capsules.
5. Chemical Anchoring - Insert the supplied resin capsules into each drilled hole.
6. Bolt Fixing - Insert bolts into the holes and drive them through the chemical capsules using a drill until they reach full depth.
7. Curing - Allow the chemical resin to cure according to ambient temperature: e.g. 20 minutes at 6–10°C, 5 minutes at 21–30°C (Refer to full cure time table for varied temperatures)
8. Final Mounting - Position the flap valve over the protruding bolts, ensuring correct alignment. Fit washers and nuts, then tighten to the recommended torque:
   
   
   • M8 bolts: 4 Nm
   • M12 bolts: 8 Nm

Post-Installation Checks

• Verify the flap swings freely and closes fully against the seal.
• Ensure no gaps exist between the backplate and wall.
• Check all bolts are securely torqued and cured.