一、Features: 
1. Safe operation, compact structure, high automation and remarkable energy saving effect.
2. Complete equipment of the unit to meet different requirements.
Provided with a heat exchanger to realize that work liquid closed cycle. In addition to using water as working fluid, it can also use special liquid such as glycol, diesel oil and DOP as working fluid.
A gas-liquid separation tank is provided to effectively separate the gas-liquid mixture discharged from the vacuum pump, After the liquid is cooled by the heat exchanger, it returns back to the vacuum pump through the self-suction of the pump as the circulation supplement of the working liquid, which reduces the sealed liquid temperature in the pump and produces a good effect. The gas is discharged to the designated place through the exhaust port of the separator. It is especially suitable for sucking inflammable, explosive and poisonous gas.
3. There are various options for liquid level control to meet different needs.
Manual level control: when the unit is working, the exhaust gas will take away a small amount of liquid steam, causing the level to drop. The working fluid can be added to the unit by manually adjusting the valve.
Electric type liquid level control: install the solenoid valve of replenishing and discharging liquid on the gas-liquid separator. When the unit level exceeds the lower limit, the solenoid valve of replenishing liquid will open automatically and replenish liquid to the unit.
When the working fluid exceeds the upper limit of the liquid level, the drain solenoid valve opens automatically, discharging excess liquid. The relevant signals can be connected to DCS according to the requirements of users.
Mechanical automatic level control: a mechanical level controller is installed on the gas-liquid separator to control the level through replenishment or discharge.
二、Model Description: 

2BW4, 353 -- 0 BK4

Bw4: code name of the complete set

353-0: type of liquid ring vacuum pump

B is material code: "B" is ordinary material

"E" is the main part

1 cr18ni9 material

Without atmospheric ejector code name "K"

4: code for sealing of packing for water supply inside the shaft

三、Spectrogram: 
四、Application field: 
Power industry: condenser vacuum
Petrochemical industry: vacuum process
Oil production industry: water and deoxygenating
Food industry: vacuum conveying, vacuum drying
Special occasions: toxic, flammable, explosive and water - deficient