LPG is mainly used for liquefied petroleum gas compressor loading, unloading, pouring, residual gas recovery, canned, residue recycling and other operations, the liquid delivery, the ideal gas recovery equipment. So it is widely used in storage and distribution of liquefied petroleum gas stations, gas mixing stations, gasification station, canning factory, refueling stations, etc., especially for large, medium and small LPG station. In addition, it applies to propane, butane, butene and other low boiling point, volatile matter and residual gas liquid delivery recycling operations. Liquid and gas transport its product variants can be used for propylene, ammonia and other recycling.