What Are Pressure Cooker Gaskets? Materials Care Maintenance

You may have heard about the gasket in the pressure cooker and wondered about this component. In some cases, people call it a sealing ring, rather than a gasket, but it means the same.

What is a gasket in a pressure cooker? A pressure cooker gasket seals the device to make it airtight. The steam builds within the container, and unable to escape, pressure builds enough to cook foods. Beware of a cracked or torn gasket because this can prevent it from reaching full PSI. 

If you’d like to learn more about gaskets in pressure cookers, keep reading. We will cover how to maintain them, the types of gaskets, and how to make them last longer.

Disclaimer: As an Amazon Associate I earn from qualifying purchases on my website. If you make a purchase through links from this website, I may get a small share of the sale from Amazon and other similar affiliate programs.

What Are Pressure Cooker Gaskets or Sealing Rings Made From?

Manufacturers make gaskets from two materials: silicone and rubber.

Silicone offers versatility and high-temperature stability. The watertight seal repels water, making it the perfect choice for a pressure cooker. Flexibility also makes it a good choice because you need this when sealing your pressure cooker. Silicone gaskets don’t shrink.

How does a rubber gasket compare? Rubber gaskets, on the other hand, offer good strength, and the rubber material prevents vibration. At the same time, rubber gaskets will seal the pressure cooker as well as the silicone gasket.

Which pressure cooker gasket is better? You might choose a silicone gasket if you want to use your cooker as a sterilizer or autoclave for mushroom cultivation. The silicone remains sterile. At the same time, silicone gaskets tend to last longer than rubber gaskets. Rubber gaskets have one huge problem they retain a food odor more than a silicone gasket.

The Right Installation of Your Gasket

After you open your pressure cooker, when new, check the gasket to see that you have it installed correctly. Manufacturers usually ship gaskets in the inside-out position. This means that when you put the gasket inside the pressure cooker, it will match up with the lid. Turn the gasket right side out.

In some cases, the gasket feels stiff or too big to fit the pressure cooker. Soaking the gasket in hot water for a few minutes will soften the material and make it easier to manipulate. You soak it until you remove the crimps and kinks in the gasket.

Not Always the Gasket’s Fault

When the gasket feels awkward in the pressure cooker, sometimes the issue relates to a warped device. This will cause the steam to escape at the weak points around the rim.

Take a measuring tape across the top of the lid. Measure as close to the center as possible. Even 1/8 of an inch off indicates a warped pressure cooker. It won’t seal. If you recently bought the pressure cooker, you could contact customer service for a replacement since this wasn’t your fault.

You could also use an old gasket on a warped pressure cooker. Silicone starts to swell as it ages, and it may fit better. Coating your gasket in vegetable oil can swell the sealing ring so that it fits better.

The Ways to Seal a Pressure Cooker

You can seal a pressure cooker in several ways, which depend on the model and brand.

Screw-Down Design: Your typical design for pressure canners, the screw-down design lacks the gasket of the other designs. While it will have screw-down knobs around it, it won’t use the gasket. Important to note, that the screw-down design is the less modern style for sealing the pressure cooker. This design will have wingnuts and bolts around the lid.

Twist N’ Lock Design: You will see the twist n’ lock design on many of the pressure cookers of today. Some say that they save on energy and cooking time. The flanges on this pressure cooker hold the lid in place for a solid seal. 

Internal Lid Design: An oval lid with a spring, this lid is larger than the pressure cooker. You turn the lid to align with the pot. The spring keeps the lid in position until the pressure cooker reaches the desired PSI. You need to turn the lid so that it aligns with the pressure cooker. 

Center Screw Design: This design puts a bar over the lid. You tighten the screw to hold the lid in the locked position. Commonly, vintage pressure cookers used this design, but you still see it used today because of the simplicity and ease of construction.

Keep a Spare Gasket on Hand

Because of the immense importance and low cost of gaskets, we would advise that you buy two -one for use and one for backup. Gaskets only cost $8 to $17. You won’t pay much, and if you use the pressure cooker a lot, you will never feel tempted to use the pressure cooker without a full seal, which can be dangerous.

How to Clean Your Gasket

Cleaning your gasket ensures that it will work as long as possible, and at the same time, keeps its seal throughout the time. First, never put the gasket in the dishwasher. The harsh chemicals that a dishwasher uses can damage the seal. Remove it from the pressure cooker at the end of each use and soak it in warm, soapy water.

In some cases, your gasket may start to take on an odor. Rubber gaskets especially have an issue because it holds in the odor more. 

To combat unpleasant odors, soak the gasket in distilled white vinegar. Take 2 cups of water and 1 cup of white vinegar. Put the mixture in the pressure cooker, seal it and set it to steam. Turn off the pressure cooker after two minutes, once it reaches pressure.

That method will totally clean your pressure cooker and the gasket of unpleasant odors. If you just want to eliminate an unpleasant odor with the gasket, soak it by itself in distilled vinegar.

Expert Advice: White vinegar works on most pressure cookers for cleaning, but we wouldn’t advise that you use it on aluminum, copper, or stainless steel. White vinegar is comprised of five to 10 percent acetic acid. This can corrode and discolor aluminum, stainless steel, and copper. 

How Often Should You Replace a Gasket?

You will need to replace the gasket every 12 to 18 months. This ensures that your pressure cooker maintains a strong seal. People who use their pressure cooker a lot may find that they need to replace it more often. 

Rather than going strictly by a time frame, we would advise that you look for indicators.

The telltale signs that you need to replace a gasket include:

• Leaks from the pressure cooker
• Gasket becomes sticky
• A gasket is difficult to stretch
• Your gasket shrinks too much and doesn’t fit

The instruction manual may contain specific advice about the gasket and when to replace it. Most of the time, if you inspect the gasket after it shows signs of trouble, you will find a tiny but visible crack, hole, or tear.

Even this can make the pressure cooker ineffective.

Worse, it can endanger you because if the seal totally fails during use, it can explode at worst or not build pressure in the container for cooking.

Get the Most From Your Gasket’s Seal

Proper maintenance will do a lot to lengthen the lifetime of your gasket. Always wash the gasket after each use and don’t use it again until the gasket dries. You need to clean the gasket because salts, spices, fats, and oils can stick to the gasket and tear it.

Don’t let the pressure cooker run dry because the internal heat from the device can damage your gasket. You want to use enough water, but don’t overfill it either. 

The golden rule with pressure cookers is to add 1 cup of liquid at the minimum unless the recipe says otherwise.

Furthermore, the liquid creates steam that builds the PSI of your pressure cooker, so you need it.

Don’t fidget with the gasket because twisting it, folding it, stretching it, or knotting it can damage the seal. Don’t let children handle it either without proper guidance because this can damage the seal.

Must read – pressure cooker safety and avoiding accidents – here

Pressure Cooker FAQs

Why Is My Pressure Cooker Leaking?

The most common reason a pressure cooker leaks is that you have a dirty or damaged gasket. You may want to wash the gasket in cold water and reinstall it. For damaged gaskets, you need to replace them because you can’t repair them. Also, they don’t cost much to replace.

How Do You Stop a Pressure Cooker From Leaking?

To stop a pressure cooker from leaking, clean the seal after each use and replace it when the time comes. You want to replace the gasket every 12 to 18 months.

To Finish – What Is a Pressure Cooker Gasket

The gasket seals the pressure cooker and allows it to build pressure within the device. When the gasket leaks, your pressure cooker won’t build steam. This component seals in the water vapor to cook the food. You do have pressure cookers without gaskets, but the modern ones use this to seal the steam inside and cook your foods.

One-Pot Cooking Rocks