– Simple guide to what it does, how to fix it, and how to keep it working

If you use a garden pressure sprayer, there's one small part you should never ignore — the safety valve. It might be tiny, but it plays a big role in keeping you and your sprayer safe.

What Does the Safety Valve Do?

The safety valve is like a pressure relief button.
When you pump your sprayer, pressure builds up inside the tank. But too much pressure can damage the sprayer or even cause it to burst. That's where the safety valve comes in — it automatically releases air when the pressure gets too high, protecting you and your equipment.

Most valves are designed to open at around 120 psi (pounds per square inch).

📚 ASABE Safety Standards – S318.18

Common Safety Valve Problems (and How to Fix Them)

Here are some typical issues you might run into with the safety valve, and how to deal with them:

Problem

What It Means

What You Can Do

Valve won't open

Pressure stays trapped inside

Check for a stuck spring or debris, clean it out

Air keeps leaking

Seal might be damaged

Replace the rubber seal or the whole valve

Valve makes noise

Pressure may be unsteady

Clean it and make sure it's seated correctly

Valve is stuck shut

Dirt or buildup inside

Soak it in warm water and clean it gently

🧪 University of Missouri: Sprayer Maintenance Guide

How to Maintain the Safety Valve

Keeping your safety valve in good condition is simple, and it can help your sprayer last longer:

✅ Rinse it after each use — especially after spraying chemicals or fertilizers
✅ Check it monthly — make sure it opens and closes without problems
✅ Replace it once a year — or earlier if it's cracked or worn
✅ Store your sprayer in a dry place — to avoid rust or damage