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LAFON DN40 1.5" BSPF Anti-Syphon Valve – 83L/min Flow, Diesel, HVO, GTL & Unleaded Petrol (E5/E10)

Stock Code: 13000000

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The LAFON DN40 Anti-Syphon Valve is a critical component for any above-ground fuel storage system, offering pressure regulation and siphon protection to prevent accidental tank drainage and site contamination. This industrial-grade valve is specifically designed for systems using diesel, HVO (Hydrotreated Vegetable Oil), GTL (Gas-to-Liquid), and unleaded petrol including E5 and E10 blends.

Constructed from high-resistance aluminium with a copper-aluminium check valve and hydrocarbon-resistant seals, the LAFON valve ensures dependable performance in demanding fuel-handling environments. The triangular flanged 1½” BSP female ports allow quick horizontal installation and maintenance without removing pipework.

Featuring an integrated mesh filter to block impurities and an adjustable screw to tune flow behaviour, this valve helps maintain system efficiency and safety. Its maximum flow rate of 83 litres per minute can be doubled with a second valve in parallel installation.

  • Protects against accidental siphoning and tank drainage
  • Prevents fuel loss and site contamination from system faults
  • Regulates consistent flow, eliminating hammering effects
  • Constructed for long life using hydrocarbon-compatible materials
  • Tri-flanged connection allows quick install/removal
  • Mesh strainer prevents debris-related blockages
  • Adjustable screw allows pressure and flow fine-tuning
  • Handles all modern fuels including E5 and E10 petrol blends
  • Serviceable in place — no need to dismantle pipework
  • Expandable flow: install two valves in parallel for 166 L/min

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  • Port Size: 1½” BSP Female (DN40)
  • Connection Type: Triangular flanged (includes flanges)
  • Body Material: High-resistance aluminium
  • Check Valve: Copper-aluminium alloy
  • Seals: Hydrocarbon-resistant (E5/E10 compatible)
  • Max Flow Rate: 83 L/min (166 L/min with 2 valves in parallel)
  • Max Liquid Column: 6 metres
  • Operating Pressure: Up to 3.4 bar (49 psi)
  • Mounting Orientation: Horizontal only
  • Filter: Integrated mesh strainer
  • Adjustment: Valve screw for installation-specific tuning
  • Fuel Compatibility: Diesel, HVO, GTL, Unleaded Petrol (E5 & E10)
  • Maintenance: Cover access without disturbing pipework
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