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Do you close pressure valve when slow cooking?

When slow cooking, it’s important to understand how your specific pressure cooker operates in order to determine if you need to close the pressure valve during cooking. Most modern electric pressure cookers are designed so that the valve closes automatically once the cooker reaches pressure. However, with stove-top pressure cookers, you typically need to manually close the valve after reaching pressure. Let’s explore this question in more detail:

How Pressure Cookers Work

Pressure cookers work by trapping steam inside the pot, allowing the temperature to rise above the normal boiling point of water. This high-pressure environment allows food to cook faster. There are a couple key components that allow a pressure cooker to build up and maintain pressure:

  • A tight fitting lid that forms an airtight seal.
  • A valve or vent that controls the release of excess steam.

On electric models, the valve is typically spring-loaded and will close automatically once a preset pressure level is reached inside the pot. Many electric pressure cookers have multiple pressure settings that correspond to different temperatures. A common setting is high pressure, which allows the temperature to reach around 250°F.

On stove-top pressure cookers, the valve design varies. Some have a weighted valve that jiggles and releases steam to regulate pressure. Others have a dial or switch to select different pressure settings. Most stove-top models require the cook to manually close the pressure valve at the beginning of cooking.

Closing the Valve on a Stove-Top Pressure Cooker

When using a stove-top pressure cooker, the general steps are:

  1. Add your ingredients to the pot and lock the lid in place.
  2. Set the heat to high and wait for the cooker to reach pressure. This is indicated by steam releasing from the valve.
  3. Once steam releases steadily, close the pressure valve per the manufacturer’s instructions.
  4. Lower the heat as needed to maintain pressure and cook time.
  5. When done, turn off the heat and allow the pressure to come down naturally. Do not try to force open the lid before pressure is fully released.
  6. Open the lid with caution, tilting it away from you to avoid the rush of hot steam.

The key step is #3 – you must manually close the pressure valve once the cooker reaches the correct pressure. The valve needs to be closed so that steam and pressure can build up inside the pot. Failure to close it will prevent the contents from cooking properly.

Electric Pressure Cookers

Electric pressure cookers operate a bit differently. Here are the general steps:

  1. Add ingredients to pot and close lid.
  2. Select cooking program and settings (pressure, time).
  3. The cooker will automatically build up pressure. The valve will close when pressure is reached.
  4. When cooking is complete, the cooker switches to a “keep warm” setting and allows pressure to naturally release.
  5. Once pressure is fully released, the lid can safely be opened.

Because electric pressure cookers have automated valves, you do not need to manually close them – the cooker handles this automatically once the program starts.

What Happens If You Don’t Close the Valve?

If you forget to close the valve on a stove-top pressure cooker, a few things can happen:

  • Pressure will not properly build up in the pot. Food will simmer rather than cooking under pressure.
  • The cooker will take much longer to come up to pressure, extending cook times.
  • Foods may be undercooked since the higher temperature of pressure cooking wasn’t achieved.
  • Liquid may boil out from the valve, making a mess on the stove.

Attempting to use a stove-top pressure cooker with the valve open essentially turns it into a regular pot. You won’t achieve the faster cook times that pressure cooking allows.

Tips for Closing the Pressure Valve

Here are some useful tips for successfully closing the pressure valve on a stove-top cooker:

  • Read your instruction manual to understand your model’s specific valve closure procedure.
  • Wait until a steady stream of steam releases before closing. This ensures pressure has built up.
  • Use a towel or oven mitt to protect your hand from steam when closing the valve.
  • Turn the valve gradually to avoid sudden pressure release.
  • Visually inspect that the valve is closed all the way.
  • Listen for the hiss of steam to stop, indicating pressure is sealed inside.
  • Lower heat to maintain gentle pressure once valve is closed.

Special Case – Quick Pressure Release

While you should typically allow the pressure to come down naturally, there is one case where you need to manually release it quickly. If a recipe calls for a “quick release” or “manual release” rather than natural release, you will need to open the valve immediately after cooking.

For stove-top models, quickly turning the valve back to the open position allows steam to escape rapidly. For electric models, there is usually a quick release button or lever. Releasing pressure quickly stops the cooking process so foods like vegetables don’t overcook.


Closing the pressure valve is a necessary step when using a stove-top pressure cooker, but not required for electric models. Failing to close the valve will prevent proper pressure build up in stove-top cookers. While quick pressure release is sometimes needed, in most cases you should allow the pressure to come down gradually after cooking. Following your cooker’s instructions for closing and opening the valve is key for safe and proper pressure cooking.

Frequently Asked Questions

Should the pressure valve be open or closed during cooking?

The valve should be closed during pressure cooking to allow steam and pressure to build up inside the pot. For stove-top models, the cook has to manually close the valve once pressure is reached. Electric models automatically close the valve.

Do you have to close the valve on an Instant Pot?

No, Instant Pots are electric pressure cookers that automatically close their pressure valve once cooking starts. You do not have to manually close it.

What happens if you forget to close the pressure valve on a stove-top cooker?

The contents will not properly cook under pressure. Foods may be undercooked, cooking will take much longer, pressure may not build up properly, and liquid may boil out of the open valve.

Why won’t my stove-top pressure cooker build pressure?

If your stove-top pressure cooker isn’t building proper pressure, the most likely cause is a failure to close the pressure valve at the beginning of cooking. Make sure the valve is tightly closed according to the manufacturer’s instructions once steam starts escaping.

Should I open the valve immediately or let pressure release naturally after cooking?

In most cases you should allow the pressure to come down naturally for 7-15 minutes. Opening the valve immediately is only recommended when cooking foods that can overcook easily, like vegetables. Always allow natural release for meat, beans, and grains.

Example Pressure Cooking Table

Food Liquid Pressure Time
Chicken breast 1 cup High (15 psi) 8 mins
Beef stew 1 cup High (15 psi) 15 mins
Dry beans 3 cups High (15 psi) 25 mins
Vegetables 1 cup Low (8 psi) 2 mins

This table provides cooking times and pressure settings for various foods when using a pressure cooker. For meat and beans, high pressure is needed to tenderize and fully cook. More delicate vegetables require lower pressure for a shorter time.