How does a chamber vacuum sealer work? The pros' secret for liquids

Why do chefs and butchers swear by the "cloche"? Discover the mechanism that allows you to vacuum-seal sauces, soups and marinades without any leaks.

If you've ever used a small external vacuum sealer (the kind where the bag stays outside), you know the struggle: as soon as you try to seal a sauce or marinated meat, the liquid is sucked out by the pump, the seal fails, and the machine gets clogged. Frustrating, isn't it?

This is precisely where the vacuum chamber machine comes in. A true standard in the food industry, it uses a completely different physical principle to guarantee a perfect seal, regardless of the contents of the bag.

1. The physical principle: Pressure equilibrium

Unlike a domestic machine that sucks air out of the bag , the chamber machine removes air from the entire chamber (the airtight tank).

The 4-step operating cycle:

1. Placement: Place the filled bag (even with soup!) in the tank and position the open edge on the sealing bar. Close the domed lid (the bell).
2. The vacuum: The powerful oil pump draws the air from the tank. The pressure drops drastically all around the bag, but also inside the bag. Since the pressure is the same inside and outside, the liquid doesn't move . It doesn't "rise" towards the opening.
3. The sealing: Once a vacuum is reached (for example 99%), the bar heats up and seals the bag.
4. Air re-admission: This is the magic moment. The machine allows outside air to rush into the tank. The pressure instantly rises around the bag, which is then violently "pressed" against the food.

2. Choose your machine according to your production

The operation is the same for all of them, but the size of the bell and the length of the sealing bar will determine your productivity. Here's how to choose your model at Sealeuse Pro .

For small kitchens and "countertop" use

Do you have limited space but need to seal sauces or prepared dishes? Compact models are ideal. You should check the length of the sealing bar (usually between 26cm and 30cm).

Compact & Pro

Small Tabletop Bell Machine

Industrial power in a compact format. Ideal for small restaurants or demanding individuals (hunters, fishermen).

See the model

The standard for restaurants (30 to 40 cm bar)

This is the core of the range. A 40cm bar allows you to vacuum-seal several small bags side by side at once, or to seal large pieces of meat.

Best-Seller Restaurant

40cm Bell Vacuum Sealer

Absolute versatility. Its 40cm bar allows for the processing of large volumes. High-performance oil pump.

Discover the 40cm standard

For butchery and intensive production (On wheels)

As soon as the volumes increase or the pieces are heavy (quarter of meat, large fish), we switch to models on a base (on wheels) with deeper tanks and longer bars (50cm, 70cm or double bar).

Industrial

Bell Machine on Wheels (50cm+)

Designed for grueling production rates. Easy to move, deep tank and double weld for total safety.

See the Industry range

3. The hidden advantages of the bell

Beyond liquids, investing in a bell jar machine offers other technical benefits:

• Cheaper bags: Bell-type machines use smooth bags . These are much less expensive than the embossed bags required for external machines. For a professional, the machine pays for itself simply through the savings on bags.
• Express Marinade: By creating a vacuum, we "open" the pores of the meat and vegetables. The marinade penetrates in 10 minutes instead of overnight.
• Maximum preservation: The vacuum level often reaches 99.8% or 99.9%, compared to 80-90% for an external machine. The shelf life is therefore extended.

4. Interview: The secret to longevity

Unlike household appliances, these machines are equipped with oil-bath pumps (like a car engine). To guarantee their operation for 10 years:

• Check the oil level regularly via the sight glass.
• Run the "pump cleaning" program once a week if you are packaging hot or humid products, to remove moisture from the oil.

Ready to take it to the professional level?

Whether you are a restaurateur, caterer or an individual passionate about preservation, the bell jar machine is the most profitable investment for your kitchen.