Excess Flow Valve (EFV) Durability

Excess Flow Valve (EFV) Durability

Status: Live
Reference: FI-0071
Lead Network: Cadent
Start Date: 01 May 2025
End Date: 01 December 2025
Budget: £149,975
Funding Mechanism: Network Innovation Allowance
Technology: Gas Distribution Networks, Hydrogen, Stakeholder Engagement
Strategy Theme: Net zero and the energy system transition
Collaborating Networks: Cadent, Wales & West Utilities
Project Partners: Cadent and WWU are funding partners on the project which has a total external cost of £112,481. The funding will be split between the partners with a ratio of 4:1 (Cadent: WWU).

Abstract

This project will help to inform UK Gas Distribution Network Operators (GDNOs) and wider industry on the long-term suitability of existing Excess Flow Valve (EFV) designs in a future where hydrogen is being distributed in network pipelines. A risk to normal EFV functionality exists in the event that an ignition occurs within the downstream gas installation pipework and this project will help to understand the effectiveness of existing EFV designs to manage this risk, identifying any necessary modifications to existing EFV designs where appropriate.

The project will develop new learning in relation to the durability of existing EFV designs when subject to ignition overpressures of varying magnitude. The learning will inform the future design of EFVs to be installed on a 100% hydrogen network.

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