How to Use a Pressure Cooker Safely? | Sealing, Steam & Release

Using a pressure cooker safely means locking the lid, keeping the steam path clear, adding enough liquid, and never opening it until the float valve drops.

Pressure cooking is fast and efficient, but the risk is real when the basic rules get skipped. Most accidents trace back to a handful of mistakes: forcing the lid open too early, blocking the steam release, or cooking with too little liquid. The good news is that the safety system is simple to follow once you know what each part does and why the order matters.

Before You Start: Check the Sealing System

Before the pot heats up, inspect the parts that keep steam where it belongs. A clogged valve or a nicked gasket turns a safe cooker into a hazard. Electrical Safety First’s pressure cooker guidance stresses checking the steam release valve, steam release pipe, anti-block shield, and float valve for blockages before each use. Food residue and grease are the usual culprits.

Make sure the sealing ring (gasket) sits snugly in the lid with no cracks or warping. Set the lid on the pot and turn it until it locks. On electric cookers like the Instant Pot, the lid clicks into place; on stovetop models, the handles align. Never start heating until the lid is correctly locked — pressure will not build properly, and hot food can escape.

Fill, Lock, and Heat: The Setup That Keeps You Safe

Add the liquid first — at least one cup of water, broth, or other thin liquid is standard for most recipes. The liquid is what creates the steam that builds pressure. Without it, you risk burning the food and damaging the cooker. Instant Pot’s safety guidance notes the unit needs enough liquid to function, and every pressure cooker’s manual will specify a minimum amount.

Do not overfill. A good rule of thumb is to fill the pot no more than two-thirds full, and less than that for foods that foam or expand like rice, beans, and grains. Overfilling blocks the steam path and reduces the cooker’s margin for safe operation

Cooking and Releasing Pressure: The Critical Phase

With the lid locked, set the steam release handle to the Sealing position on Instant Pot models (stovetop cookers use a pressure regulator or weight that sits on the vent pipe). Turn the heat up. Pressure builds, and the float valve rises once the pot reaches pressure.

After cooking, pressure must come down before the lid opens. There are two standard methods:

• Natural Release — let the cooker sit until pressure drops on its own and the float valve falls. Best for large roasts and foods that foam.
• Quick Release — move the valve to Venting and wait until the steam stops. Only for thin liquids.

For fatty, oily, thick, or high-starch foods like stews, chilis, pasta, and beans, quick release can spray hot liquid. Use natural release for those instead.

Keep your face and hands away from the steam release area during cooking and when venting. The steam is hotter than boiling water and causes serious scalds instantly. If the float valve is still up or the lid resists, do not force it — that resistance means pressure is still inside.

When you’re ready to open, lift the lid away from your face so the steam inside the pot doesn’t hit you directly.

Pressure Cooking vs. Pressure Canning: Do Not Mix Them Up

Pressure cooking and pressure canning are different jobs. A pressure cooker is for fast meals. A pressure canner is a specialized, larger tool that maintains higher temperatures to kill botulism spores in low-acid foods. Water-bath canners cannot reach those temperatures. University of Missouri Extension’s pressure canning guide explains that low-acid foods like meats and vegetables require a pressure canner.

If you’re comparing models for meals, the practical details matter more than brand hype — you can see how we tested the top options in our review of the best pressure cookers.