---
title: "What Is Air relief valve? Pool Glossary | Marina Pool Services"
description: "The air relief valve is a small valve on top of the filter that releases trapped air. Plain-English pool glossary from Marina Pool Services in Grapevine, TX."
url: https://marinapool.multisites.ai/glossary/air-relief-valve
publisher: Marina Pool Services
phone: +1-817-896-1120
quote: https://marinapool.multisites.ai/contact
---

Equipment

# Air relief valve

The air relief valve is a small valve on top of the filter that releases trapped air.

Air collects at the top of the filter tank. The air relief valve lets it out. This protects the filter from high pressure and keeps flow smooth.

Open it slowly when you start the pump. Stand to the side, because a tank full of air can spit water. Close it as soon as water flows out. A valve that spits air all the time often means an [air leak](https://marinapool.multisites.ai/glossary/air-leak) upstream. A valve that leaks water needs a new seal or replacement. Check the [gauge](https://marinapool.multisites.ai/glossary/pressure-gauge) as well.

[Marina can helpPool Filter Service & Installation](https://marinapool.multisites.ai/our-services/pool-filter-repair)

## Related terms

-   [Pressure gauge](https://marinapool.multisites.ai/glossary/pressure-gauge)
-   [Air leak](https://marinapool.multisites.ai/glossary/air-leak)
-   [Pool filter](https://marinapool.multisites.ai/glossary/pool-filter)
-   [Priming](https://marinapool.multisites.ai/glossary/priming)

## Need a hand with your pool?

Call or text and tell us what your pool needs. Estimates are free for qualifying services, and same-day estimates are possible when the schedule allows.

[Call (817) 896-1120](tel:+1-817-896-1120)[Get a quote](https://marinapool.multisites.ai/contact)

![A pool technician working on an equipment pad](https://marinapool.multisites.ai/_astro/technician-equipment-pad.BW5xZMNY_Zum1K5.webp)