Fernco Spigot Mounted Flap Valve

• Mounting: Spigot-mounted (FVS Series)
• Size Range: DN100 to DN630
• Material: High-Density Polyethylene (HDPE), with 316 Stainless Steel hardware
• Spigot Connection: Suitable for internal pipe fit or external coupling
• Seal: EPDM sealing tape or integrated bush (size dependent)
• Pressure Rating: 7 mwc
• Cracking Head: Typically 7 mm water column
• Standards: Exceeds DIN 19569-4, ISO 9001:2015, and BS7775
• Installation Method:
  
  • Option 1: Insertion into pipe with EPDM sealing tape
  • Option 2: Coupling onto pipe using Fernco shear banded coupling
• Max Temperature Range: -30°C to 130°C
• Recommended Max Temperature: 80°C (constant), 100°C Intermittent

This high-performance spigot-mounted flap valve is purpose-built to prevent reverse flow and flooding within drainage and sewerage systems. Designed for direct connection to pipelines, it features a robust HDPE construction that resists corrosion and impact while remaining lightweight for ease of handling. The spigot design ensures compatibility with a range of pipe diameters, either via insertion or with a Fernco shear banded coupling for a secure, watertight fit. Ideal for new installations or retrofit applications, the valve acts as a dependable non-return solution in systems exposed to tidal surges, heavy rainfall, or high water tables.

• Reliable backflow prevention for pipelines
• Direct spigot connection simplifies installation
• Options for insertion or coupling-based fixing
• Manufactured from corrosion-resistant HDPE
• Lightweight yet impact-resistant for safe handling
• EPDM sealing tape or integrated bush ensures leak-free fit
• No internal pipe obstruction – maintains optimal flow
• Resistant to UV, chemicals, and environmental degradation
• Operates under low cracking head pressures
• Fully recyclable and has no scrap value – theft deterrent

*Dimension taken from end of spigot to front plate strengthening ribs.

Important: Confirm the internal and external pipe diameters before installation to ensure correct sizing and seal fitment. The hinge must be positioned at the top (12 o’clock).

 
Tools & Materials Required

• Fernco shear banded coupling or EPDM sealing tape (size dependent)
• Marker pen or chalk
• Torque wrench
• Screwdriver or spanner (for clamp tightening)
• PPE (gloves, goggles, etc.)

Installation Method Options

The valve can be installed in one of two ways:

 
Option 1: Using Fernco Shear Banded Coupling (Recommended)

1. Pipe Preparation: Ensure pipe end is flat, clean and free from debris. Mark the coupling width equally on both the spigot and the connecting pipe.
2. Optional Bush Installation: If a sizing bush is required, slide it onto the spigot until flush with the marked line.
3. Coupling Fitment: Slide the coupling over the spigot (or bush) and hand-tighten the central shear band.
4. Alignment and Final Fit: Align the valve with the main pipe and ensure the hinge is at 12 o’clock. Tighten all clamp bands to the specified torque in sequence, starting from the centre.

Option 2: Insertion Using EPDM Sealing Tape

1. Pipe Preparation: Ensure internal surface of the host pipe is clean and smooth. Confirm that the flap valve’s spigot will insert fully without obstruction.
2. Apply Sealing Tape: Wrap the self-adhesive EPDM tape around the valve’s spigot to create a 5mm oversized diameter relative to the pipe’s internal diameter.
3. Valve Insertion: Gently insert the spigot into the pipe until the backplate is flush. Ensure the hinge is positioned at the top (12 o’clock).

Post-Installation Checks

• Ensure the valve flap opens freely and closes flush against the seal.
• Check for secure, even seating around the spigot.
• If using a coupling, recheck clamp band tightness after 24 hours.