All the pressure lately is from pressure cookers…

2022-09-19 0 By

Aunt Pan on The Beginning has single-handedly given viewers pressure cooker PTSD, so let’s talk about that cooker!In 1964, the first pressure cooker of New China was successfully trialproduced in Shenyang and put on the market, which enriched the variety of cooking utensils in Our country and brought convenience to people’s life.Especially if you cook meat in a pressure cooker, it cooks fast, badly and tastes good!It takes advantage of the fact that the boiling point of a liquid is affected by pressure: the higher the pressure, the higher the boiling point.When a standard atmospheric pressure, the boiling point of water at 100 ℃, pressure cooker because its sealing is good, as the primary sealing structure of sealing ring will put the pot of water vapor seal, when water is heating, and water vapor can’t eduction, will make the pot of the pressure is greater than a standard atmospheric pressure, the boiling point of water is up to more than 100 ℃.In such a high temperature and high pressure environment, and water vapor transfer high heat, so the efficiency of stew food is greatly improved.How high is the pressure in a pressure cooker?Pressure cooker pressure is generally in 70kPa to 130kPa, the maximum pressure can reach 260kPa above, it is undoubtedly the kitchen pressure “ceiling”.But in the pressure measurement, it is not really “high pressure”, the high pressure in the measurement can exceed 100MPa, ultra-high pressure can even reach 2500MPa (1MPa=1000kPa).Therefore, the pressure of the pressure cooker can only be regarded as “children”.Measurement of small knowledge 1 standard atmospheric pressure is about 0.1MPa, equivalent to an adult standing on the palm of a primary school student pressure.The mariana trench is the deepest in the world, reaching a depth of around 11,000 meters. Its water pressure is 110MPa, equivalent to that of a full-grown elephant standing on the lid of your big toe.China’s ultra-high pressure national benchmark can produce and measure the maximum pressure of 2500MPa, is the world’s only existing can measure the pressure of more than 2000MPa device.However, the pressure cooker this “little friend” but will be “emotional”, if not treated correctly, will be “fryer” in a minute!In the use of pressure cooker, with the increasing pressure in the pot, once the internal pressure is greater than the bearing capacity of the sealing structure of the pot body, or the sealing structure leaks when high pressure, it is easy to fryer!And because water vapor expands rapidly as a gas, it’s powerful.In order to make the pressure in the pressure cooker within a safe range, the pressure cooker cover is provided with a safety valve.Hammer type safety valve: at the highest point of the pot cover, when the pressure in the pot exceeds the set value, it will put the hammer on the top, accompanied by the whistle, the gas discharge, reduce the pressure in the pot, so that the pressure in the pot is stable.Fusible plate type safety valve: the temperature in the pot will rise with the pressure, when the temperature reaches the warning value, fusible plate is broken, and the gas is discharged to release the pressure in the pot.Especially when the hammer type safety valve due to failure, fusible plate type safety valve to prevent the occurrence of accidents on a layer of double insurance, once the effect will be destroyed, need to be replaced.Hardcore “Fried” regulations, read the manual inspection seal, seal clean no damage to the check valve, ensure no blockage, no foreign body inside the pot water not more than two thirds, if it is easier to expand food (such as beans, porridge, etc.), recommend no more than half and cover when it must be completely co-founded cover must be completely to reduce pressure of before, after the valve core is completely reset,To open the lid to pay attention to the service life, generally not more than 8 years the correct use of pressure cooker is the key New Year let us get rid of all the pressure to meet new challenges