1. Brief introduction of system:
    The gasoline in the transport, storage and filling process, because of its easy evaporation, will produce a large number of oil and gas,. The oil and gas will have many adverse consequences: 1 unsafe: evaporation vapor may cause an explosion or combustion. 2 environmental damage: because oil and gas contains large amounts of toluene, will endanger the health of the operator, and the surrounding environment pollution due to waste energy: 3 oil and gas continuous evaporation, will waste a lot of energy. Gas station oil and gas recovery system is mainly used for oil and gas recovery of gas station, to reduce pollution and save energy effect.
    In recent years, the number of cars and the rapid growth in the number of gas station, oil consumption has increased significantly, but the oil pollution and resource waste oil station oil is also gradually by the people and government departments attach great importance, but also a considerable part of the gas station hidden safety problems of different degree, the safe distance of substandard and overflow bulk oil gas concentrations exceed the standard is particularly prominent. At present, the domestic part of the city introduced for reference foreign improvement measures, namely the oil gas recovery device, achieved satisfactory results. The recovery principle is divided into two stages. The first stage is a tank truck closed unloading; the second stage is the tanker oil when the oil and gas recovery. Company gas oil and gas recovery configuration instructions, system consists of vacuum pumps, oil and gas separation connector, coaxial short tube, breaking valve, coaxial long hose, gun.

Constitute parts:
1) Vacuum pump
    It can be divided into two kinds, one kind is the central type recovery vacuum pump, another for the distributed recovery vacuum pump. The central type recovery vacuum pump: This is one or two vacuum pump oil recovery to all tank, divided into electric and non electric vacuum pump; distributed oil and gas recovery vacuum pump: This is in each gas oil and gas recovery vacuum pump is installed in the machine.

2) Oil and gas separation joint
　　　The main function is to separate coaxial tube of oil and gas. The joint domestic factory all has own R & D, the following diagram is Healy CX6-A oil and gas separation joint.

Reusable coaxial abruption valve
　　　Main function is to prevent the vehicle will refueling machine down and reusable. When the external force meets 310~350 pounds of tension, pulling off the valve will automatically disengaged and the oil and gas path ends closed.
　　　
4) Coaxial tube:
　　　The oil and gas road are the same tube, inner tube is for pneumatic and outer pipe is for oil.
Oil gun:
    Oil and gas recovery gun is different with the traditional oil gun. There is a pneumatic valve in the oil gun and barrel is a double-layer.