LYCO® Excess Flow Valves (EFV) provide safety for the natural gas or propane consumer by mechanically stopping the flow of gas when the flow rate exceeds design limits.

Download Product Brochure (739k pdf)

R.W. Lyall currently offers two designs of Excess Flow Valves:

• LYCO® EFV I Series
  Primarily for 3/4 - 1 IPS "Stick" applications
  Series 350, 475, 775, 1200 or 1800 SCFH Trip Point @ 10 psig
• LYCO® EFV II, Magnum Series
  Primarily for 1/2 CTS "Stick" applications
  Series 375, 400, 450, or 775 SCFH Trip Point @ 10 psig

With Lyall's superior design, unparalleled technical assistance, and easy-to-use calculator software you can make the optimal EFV selection.

Configurations:

Your choice of Medium of High Density PE pipe carrier.
Reducer Ends or Socket Fusion Couplers
Adapted to Mechanical Couplings
Adapted to Service Tees

View Configuration Guide


Design Benefits:

• Meets or exceeds requirements of CFR Title 49 Part 192.381.
• Lyall's patented design provides the lowest pressure drops in the industry for ½ CTS service protection.
• Spring is housed outside of the high velocity gas stream.
• Designed to resist clogging due to line dust & particulate build up.
• By-Pass (Bleed By) Feature. This feature allows the EFV to reset itself after repair of the damaged service line.
• Lyall's EFV modules allow integration into a multiple of carriers, giving you many options to choose from.

Request Lyall’s EFV Calculator (.xls)

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