gas dispenser refers to that in the form of compressed natural gas (CNG) to the natural gas vehicle (NGV) and large CNG station car fuel gas equipment, gas in natural gas pipeline through pre purification processing, first commonly to remove sulfur in the gas and moisture, natural gas dispenser again by the compressor unit to pressure from 0.1 Mpa to 1.0 Mpa compressed to 25, finally through the sale of qi activity to gas vehicle gas dispensers.