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There are two types of natural gas compressors: centrifugal compressors and reciprocating compressors. http://tc.sinaimg.cn/maxwidth.2048/tc.service.weibo.com/p/img_jdzj_com/908d3a620e5680546ca95af87c6cfbb6.jpg I. Working principle of piston compressors When the crankshaft of a piston compressor rotates, the piston moves back and forth via the connecting rods; as a result, the working volume formed by the inner wall of the cylinder, the cylinder head, and the top surface of the piston changes periodically. When the piston of a piston-type compressor begins to move from the cylinder head, the working volume inside the cylinder gradually increases. At this point, gas enters the cylinder through the intake pipe, pushing open the intake valve, until the working volume reaches its maximum value at which point the intake valve closes ； When the piston of a piston-type compressor moves in the opposite direction, the working volume inside the cylinder decreases, causing the gas pressure to rise. When the pressure inside the cylinder reaches and slightly exceeds the exhaust pressure, the exhaust valve opens and the gas is expelled from the cylinder, until the piston reaches its extreme position at which point the exhaust valve closes. When the piston of the piston compressor moves in the opposite direction again, the aforementioned process repeats. In summary, as the crankshaft of a piston compressor rotates one full circle, the piston moves back and forth once, allowing processes such as intake, compression, and exhaust to take place sequentially within the cylinder, thus completing one working cycle. II. Working Principle of Centrifugal Compressors The structure and working principle of centrifugal compressors are very similar to those of centrifugal blowers. However, its working principle is fundamentally different from that of piston compressors; it does not increase the pressure of the gas by reducing the volume of the cylinder, but rather relies on changes in kinetic energy to do so. A centrifugal compressor features a rotating impeller with blades; as the impeller rotates, these blades drive the gas in motion or impart kinetic energy to it, and then some of this kinetic energy is converted into pressure energy, thereby increasing the pressure of the gas. This article is from China Compressor Network