Breathing pressure vacuum safety valve Breathing valve (referred to as breathing valve) is a special valve device, its main function is to maintain the pressure balance of the storage tank, prevent the tank from being damaged due to overpressure or vacuum, and reduce the evaporation loss of storage liquid.
Definition and classification
Definition: Breathing valve refers to a valve that not only ensures that the storage tank space is isolated from the atmosphere within a certain pressure range, but also can communicate with the atmosphere (breathing) when exceeding or below this pressure range.
Classification:Emergency pressure relief valves Manhole cover According to the working principle and use, breathing valves can be divided into tight breathing valves, oil-sealed breathing valves and other types. According to the selection of material, the breathing valve can also be divided into cast iron breathing valve, carbon steel breathing valve, stainless steel breathing valve and so on.
Composition and working principle
Composition: The breathing valve is mainly composed of a seat, a valve cover, a protective cover and two groups of opening and closing devices controlled by vacuum and pressure. The opening and closing device comprises a valve disc, a guide rod, a spring, a spring seat and a sealing ring, etc.
Working principle: When the pressure of the medium in the tank is within the control operating pressure range of the breathing valve, the breathing valve does not work to maintain the tightness of the oil tank. When the pressure in the tank rises to the rated positive exhaled pressure, the pressure valve flap opens and the steam in the tank is discharged; When the vacuum degree in the tank reaches the rated suction negative pressure, the vacuum valve flap opens and the air enters. In this way, the breathing valve can automatically adjust the pressure inside and outside the tank to maintain the balance of air pressure in the tank.
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"He doesn't mind." "Huh? Who doesn't?" Pockmark scratched his head, "Oh! You said six brother doesn't mind you? What good is it if he doesn't hate you? You see the six brothers that lazy look, the bowl that ate the first meal can then eat the second meal, clothes and rags are the same..." Seventeen looked at the pockmark behind, pockmark will continue to advise seventeen, a slap on his head, scared pockmark immediately shut up. Xiao Six's head leaned over and grabbed the money bag from Ma Zi's hand, "Hey, it's a lot of money! You can drink tonight!" Small six eyes on the money, also ignore to ask what pockmarks are sneaking around, grabbed the money bag and rushed out, pockmarks crying and chasing, "Don't ah, six brother, that is the money I saved to marry a wife... Get to work..." In the evening, we had a meal of big fish, big meat and big wine, small six and string is not to eat white not to eat, eat happily; Pockmark is to eat more than a little loss, eat pain; The old wood drank and looked at seventeen. After dinner, Xiao six, string, pockmark are drunk. Today it is Xiao Liu's turn to wash the dishes, but I do not know when the rules of the Hui Chun Church have become that the work of seventeen is the work of seventeen, and the work of Xiao Six is also the work of seventeen. 17 He put away the dishes and chopsticks, filled a large wooden basin with water, squatted down in the courtyard, and washed. The old man stood behind him and asked, "Who are you?" In the evening breeze, the dumb voice: "I am Ye seventeen."