1. Fire retardant breathable cap is changed to fire retardant breathable valve to keep the system closed;
2. Through unloading tubing, return pipe, quick joint, etc., the tank car and underground storage oil form a closed system;
3. Automatically and balanced replacement of oil and gas in underground storage tanks into tank cars while unloading oil;
4. Oil and gas recovery rate is greater than 95%
Used for quick docking for oil and gas recovery, good sealing, so that oil and gas leakage is not diffused, equipped with the top rod, with the opening of oil and gas recovery joint, using copper handle locking, oxidation treatment of the product surface, with strong corrosion resistance, aluminum alloy casting, light and firm.  The oil and gas recovery joint is installed on the ground and connected with the exhaust pipe. When the oil tanker is unloading, the oil and gas stored in the underground tank is recovered to the tank car through the hose connected with the quick joint.  The three-way floating ball valve is installed in the underground oil tank man well and connected with the exhaust pipe and the gas oil tank.  The floating ball valve prevents the oil from flowing to another connected tank when it is full out.  Float ball valves can also be installed on the ground to communicate with the exhaust pipe.  The vacuum pressure valve is installed at the top of the exhaust pipe about 4.5 meters high. The pressure cap is set at +3" water column to discharge oil and gas, and opened at -8 "water column to inhale air. Its role is to maintain the pressure in the underground oil tank.  Vrp-91 oil and gas recovery vacuum pump is non-motor type, which can be directly connected to the tanker.
Vrp-90 series oil and gas recovery vacuum pump is a vacuum pump developed and produced by Henghe company, which is suitable for secondary oil and gas recovery transformation of gas stations.  The pump has the characteristics of simple structure, reliable performance, low noise, light weight and beautiful appearance.  The pump can also be used to suck gas, gas, hydrogen, petroleum cracking gas and other flammable and explosive gases.  Mainly used in packaging industry, machinery industry, petrochemical industry, etc.  Oil and gas recovery Nozzle standard component design, easy to disassemble, parts can be replaced, Easy to operate, can be operated with one hand and can be fixed, Inlet diameter: M34
The Fule Nozzle only weight is 1.4kg, Popular two-section hand guard design, The fule nozzle is durable and light. The nozzle is made of stainless steel and aluminum; 100% ex-factory detection rate
Through the ISO9001-2000 quality system certification . Coaxial break - off valves are reusable.  The disconnector can withstand about 300 to 350 pounds of force before being separated, cutting off the gas and oil lines and preventing the tanker from being towed down.  To reattach the two broken pieces, it only needs to be locked with a special screw to restore the function.  Apart from being damaged by improper external force pulling the separator, only the replacement of internal parts can be used, as long as the installation is correct, normal without maintenance work.