What are absolute pressure, gauge pressure, vacuum degree, and vacuum pressure? Pneumatic Technology FAQs

A:What is pneumatic technology? What is pneumatic in English? Q: Pneumatic technology is an engineering technology that uses air compressors as the power source and compressed air as the working medium to transmit energy or signals. It is one of the important means to achieve various production controls and automatic controls. Pneumatic is the abbreviation of "pneumatic technology" or "pneumatic transmission and control". The English name of pneumatic is: PNEUMATIC. A: What is the current application status of pneumatic technology? Which industries and equipment are used in pneumatics? Q: At present, pneumatic technology is widely used. All automated equipment can be applied to pneumatics, such as: welding production lines in the automobile manufacturing industry;assembly production lines of color TVs, refrigerators and other household appliances in the electronics and semiconductor manufacturing industries;in semiconductor chips, Assembly lines for various electronic products such as printed circuits;automatic air jet looms, automatic cleaning machines, metallurgical machinery, printing machinery, construction machinery, agricultural machinery, shoemaking machinery, plastic product production lines, artificial leather production lines, glass product processing lines, etc. ;Automatic metering and packaging lines for fertilizers, chemicals, grain, food, medicine, etc. A:What are the characteristics of pneumatic technology? Q: Advantages of pneumatic technology: simple structure, low pressure level, safe use, easy maintenance, simple installation;it can be fireproof, explosion-proof and moisture-proof. The disadvantages of pneumatic technology are that the positioning accuracy is not high and the speed characteristics are greatly affected by the load. The output force is much lower compared to hydraulic pressure. A:What is absolute pressure? What is gauge pressure? What is vacuum degree? What is vacuum pressure? What is the relationship between them? Q: Absolute pressure is the pressure value based on absolute vacuum as the starting point. Generally, "ABS", that is, Pabs, needs to be marked on the lower right corner of the symbol indicating absolute pressure. Gauge pressure refers to the pressure value higher than the local atmospheric pressure. It is generally not marked. If necessary, "e" can be marked in the lower right corner, which is Pe. Vacuum degree refers to the pressure value (positive value) lower than the local atmospheric pressure. Vacuum pressure refers to the difference (negative value) between absolute pressure and atmospheric pressure. Vacuum pressure is numerically the same as vacuum degree, but should be preceded by a negative sign. The relationship between absolute pressure, gauge pressure and vacuum pressure is: absolute pressure = gauge pressure (vacuum pressure) + local atmospheric pressure. A:What is the standard state and baseline state? Q: The standard state refers to the state of air when the temperature is 20°C, the relative humidity is 65%, and the pressure is 0.1MPa. Under standard conditions, the density of air is 1.185kg/m^3. According to ISO8778, the unit under standard conditions can be marked with "(ANR)" after it, such as 30m^3/h (ANR). The reference state refers to the state of dry air with a temperature of 0°C and a pressure of 101.3kPa. The air density under the base state is 1.293kg/m^3. A:What is a perfect gas? What is the equation of state for a perfect gas? Q: A perfect gas is an imaginary gas whose molecules are elastic particles that do not occupy a volume. There is no interaction between the molecules except for collisions with each other. Completely different concepts from ideal gas. The equation of state of a complete gas: pv=RT or written as p=ρRT=(m/V)RT. A:What is absolute humidity? What is relative humidity? Q: The mass of water vapor contained in each cubic meter of humid air is called absolute humidity, which is the water vapor density of humid air. There is a limit to the water vapor content in humid air. Under a certain temperature and pressure, when the water vapor content in the air reaches the maximum possible content, the air at this time is called saturated air. The state of saturated air is called saturated state. Below 2MPa pressure, it can be approximately considered that the density of water vapor in saturated air has nothing to do with pressure and only depends on temperature. The ratio of the actual content of water vapor per cubic meter of moist air (i.e., the water vapor density of unsaturated air) to the maximum possible water vapor content at the same temperature (i.e., the saturated water vapor density) is called relative humidity. A:What is dew point? What is pressure dew point? Q: For unsaturated air, the temperature at which the water vapor partial pressure remains unchanged and the temperature is reduced until it reaches a saturated state is called the dew point. When the temperature drops below the dew point, water droplets will precipitate in the humid air. The temperature at which moist air begins to precipitate water droplets after being compressed is called the pressure dew point. The higher the pressure, the higher the temperature at which water droplets begin to precipitate. A: What do the flow characteristics of pneumatic components refer to? How to express the flow characteristics of pneumatic components? Q: The flow characteristics of a pneumatic component refers to the relationship between the pressure drop at both ends of the inlet and outlet of the pneumatic component and the flow rate through the component. The Cv value, Kv value, effective cross-sectional area A value, effective cross-sectional area S value, flow coefficient Cd, sonic conductance C value and street pressure ratio b value under incompressible flow state, as well as the effective cross-sectional area value under congestion flow can be used.