What is the pressure in the pressure cooker, What is the maximum pressure holding valve

Pressure cooker - a brilliant invention, a long time firmly entered in our everyday life. It allows you to quickly prepare any dish, even from slowly tenderize products under normal conditions of heat treatment, while maintaining most of the nutrients and taste.

varieties of pressure cookers

Now produced many varieties of them:

• having different volumes - from 0.5 to 40 liters (5.3 liters most optimal);
• mechanical for cooking on the stove;
• power to the heating unit and control panel;
• different buildings and structures complicated materials.

But they all operate on the same principle - in a sealed container under high pressure, resulting from the steam by heating water, temperature is increased to a level exceeding the boiling point of 100C under normal conditions. It can reach up to 120 ° C, resulting in a much faster cooking.

Important! Current cookers are made of different materials (, teflon coated aluminum, stainless steel). The aluminum is not suitable for cooking salty or sour dishes, since oxidation of the metal occurs with the release of harmful substances.

pressure level in a pressure cooker

boiling temperature of the liquid depends on the level of atmospheric pressure. Under natural conditions, and access of oxygen to increase the temperature of the fluid can not be more than 100C. In mountainous regions, where the low atmospheric pressure, water boils at lower More temperatures (per kilometer altitude 4C below), which significantly prolongs heat processing products.

Under the conditions without access of oxygen, the pressure created in the sealed container lid, which affects the temperature rise - every 10 mm Hg increase its yield approximately 0,3S. On the basis of this law of physics, and it was invented by a pressure cooker, significantly speeding up the preparation of the products.

Important! Better to choose the pressure cooker with the hermetic seals at the junction of the bowl and cover to protect them from damage. The slightest deformation leakproof and lead the dishes into disrepair. Especially susceptible to this pressure cooker without gaskets of special rubber.

Depending on the temperature

Each model has two heat settings:

1. At a pressure of 0.3 bar is the maximum cooking temperature to 109C. This mode allows you to cook foods with soft texture - vegetables, fish, poultry.
2. The second mode at a pressure of 0.7 bar gives 166c temperature (in some models to 120C). This allows you to quickly prepare the meat, beans and other foods slowly fall apart.

Reference! For comparison - in multivarka rice is cooked for 40 minutes, and 12 minutes in a pressure cooker for cooking chicken in multivarka It takes about an hour, and in a pressure cooker for 15 minutes, aspic in preparing multivarka 2-3 hours in a pressure cooker and a total of 40 minutes.

What is the pressure in the pressure cooker keeps the valve

Pressure cookers are equipped for the safe operation of the safety valves on the covers - the main and emergency (some models have even 2 spares). The valves regulate the discharge of excess pressure. If this is not done, the unit may be at the limit level may explode.

Mechanical models, which require more careful handling - when heated on a gas or electric stove you need to make sure that they do not overheat. Modern with protective flaps, safer - when the pressure inside the pot up to the maximum allowable level of the main valve is activated and becomes steam discharge. The alarm is set to a higher pressure level and operates in critical situations when the primary fails. Electric cooker have automatic temperature control.

What is the maximum pressure can withstand a pressure cooker

Due to the high pressure in the pressure cooker safety measures are taken to:

• Valves discharging excess steam;
• mechanical locks on covers to protect against accidental opening;
• Electronic device for adjustment of pressure;
• cover right after turning off can not be opened - you need to wait until the pressure drop or accelerate this process by using cold water.

Depending on the model, the maximum pressure can be different - from 1 to 4.5 bar. Feedback from consumers, there are times when the tank exploded and 2.5 bar. This leads to injury, burns, damage to the surroundings. Therefore, you need to use a pressure cooker very carefully. Each of them comes with instruction manual, which specifies the maximum permissible level.

Even a well-equipped model with protective devices if misused can fail - when clog valves, if the lid is opened when the pressure cooker is not cooled (obtained emission of hot spray that cause burns).