Storage tanks in industrial and mining, petroleum, chemical, pharmaceutical, textile, construction, steel furnace and other industrial enterprises plays an important role in the application. Storage tanks of compressed air source and stable air pressure. Can eliminate or weaken the piston type air compressor exhaust periodic flow pulsation, stable pressure in the pipeline, and it can be finished in a supply pipe stop after a short time necessary pneumatic program operation, the compressed air at the same time, through the air tank and must be reduced, in addition to water, the decontamination effect of preliminary treatment.