Selecting an Excess Flow Valve

Article Published: April 27, 2022 11:22 AM
Last Updated: July 29, 2025 3:20 PM
Written by: Jack Carr

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An excess flow valve (EFV) is an automatic shutoff valve through which pressurised gas or liquid flows, and it is essential for many pipeline applications. They are designed so that at normal flow rates the fluid will pass through unrestricted, however in the event of an dramatic increase of flow it will trigger the EFV to quickly close off the flow.

Download our guide below to find out what information we will need in order to size your excess flow valve: 

Meet the Author

Jack Carr

Technical Sales & Marketing Manager, Boiswood

Jack combines deep technical expertise with hands-on experience in pressure and flow control systems. With a strong focus on real-world applications, he works closely with customers to understand their challenges and deliver fit-for-purpose solutions. His practical approach and in-depth product knowledge ensure every recommendation is accurate, efficient, and built around performance.

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