2BV Series Liquid Ring Vacuum Pump

1. Industrial vacuum suction 

Relying on the water ring seal and eccentric impeller structure, it can quickly extract gas from a closed space to form a stable vacuum environment, meeting the negative pressure requirements of processes such as vacuum filtration, vacuum drying, and vacuum adsorption.

2. Low-pressure gas compression 

It also has a light compression function, which can compress the pumped gas under low pressure and then discharge it, making it suitable for gas transportation, exhaust gas recovery and other working conditions, without the need for additional compression equipment.

3. Oil-free cleaning operation 

Using water as the working medium, there is no oil mist emission during operation, which will not contaminate the pumped medium and the working environment. It is especially suitable for industries with high cleanliness requirements, such as pharmaceuticals and food processing.

4. Gas-liquid mixing and conveying 

It can tolerate the mixing of small amounts of liquid and can simultaneously pump gas and liquid media. It is suitable for gas-liquid coexistence processes such as vacuum distillation and material dehydration, and avoids liquid entering the pump body and causing malfunctions.

5. Stable pressure regulation

By adjusting the water supply flow and exhaust valve, the vacuum level and exhaust pressure can be precisely controlled to maintain stable operating conditions and adapt to the different vacuum requirements of different processes.

1. Media Environment 

Suitable for pumping air, water vapor, and non-corrosive gases that do not contain solid particles and are insoluble in water; can tolerate small amounts of condensable gases (such as oil vapor and steam). Do not pump strong acids, strong alkalis, flammable and explosive gases (such as hydrogen and methane), gases containing hard particulate dust, or media that react violently with water. When the flow-through parts are made of cast iron, it is suitable for neutral/weakly alkaline media; stainless steel can withstand weakly acidic media (pH 5-9).

2. Temperature environment 

The operating water temperature needs to be controlled between 5℃ and 35℃. Too high a water temperature will reduce the vacuum, while too low a water temperature will easily cause scale buildup on the pump body. The operating ambient temperature of the equipment is -10℃ to 40℃. Outdoor installations need to be equipped with rainproof and sunproof covers to avoid freezing at low temperatures or aging of the seals due to high temperatures.

3. Installation Environment

It should be installed in a dry, well-ventilated indoor or machine room free of dust and corrosive gases; the ground should be flat and firm, with reserved maintenance space (≥0.8m); avoid installation in areas with high vibration and easy impact, the pump body should be fixed on a shock-absorbing base to reduce the impact of operating vibration on the pipeline; filter devices should be installed at the inlet and outlet to prevent impurities from entering the pump body.

4. Electrical Environment 

Standard configuration includes three-phase 380V/50Hz power supply; 220V/60Hz and 440V/60Hz specifications can be customized to suit overseas markets. Overload, phase loss, and leakage protection switches are required; the electrical control cabinet must be kept away from humid and dusty areas. The motor protection rating is IP54 (IP55 optional for outdoor models) to prevent water ingress or dust accumulation in the motor.

1. Oil-free operation, suitable for high cleanliness requirements. 

Using water as the sealing and working medium, there is no oil mist emission during operation, which will not pollute the gas being pumped or the working environment. It is especially suitable for industries with strict requirements for the purity of the medium, such as pharmaceuticals, food processing, and fine chemicals.

2. Stable vacuum level and strong adaptability to operating conditions 

The eccentric impeller and water ring sealing structure design can form a stable negative pressure environment with small vacuum fluctuations; it supports gas-liquid mixing and suction, can tolerate a small amount of condensable gas, and is suitable for complex working conditions such as vacuum distillation and material dehydration.

3. Low noise and energy saving, low operating cost 

The optimized hydraulic model design reduces motor energy consumption by 10% to 15% compared to similar vacuum pumps; the water buffer noise reduction structure reduces operating noise to below 75dB, eliminating the need for additional sound insulation devices and saving on maintenance costs.

4. Compact structure, easy installation and maintenance 

The machine is small in size and light in weight, and can be flexibly installed indoors or in a computer room without the need for complex foundation engineering; it has few vulnerable parts, and daily maintenance only requires periodic replacement of seals and cleaning of filters. It is simple to operate and has short downtime.

5. Wear-resistant and corrosion-resistant, with a long service life. 

The flow-through components can be made of cast iron or 304/316 stainless steel. The cast iron version is wear-resistant and impact-resistant, while the stainless steel version is resistant to weak acid and alkali media. The seals are made of fluororubber, which is resistant to high temperature and aging. The average service life of the whole machine can reach 8 to 10 years.

6. Multifunctional with high integration of features 

It combines the functions of vacuum suction and low-pressure compression, which can meet the needs of various processes such as vacuum filtration, vacuum adsorption, and exhaust gas recovery. No additional compression equipment is required, reducing equipment procurement costs.

1. Pharmaceutical industry 

Used in processes such as vacuum distillation, vacuum drying, pharmaceutical filtration, and raw material purification, oil-free operation avoids drug contamination, and stable vacuum ensures the purity of pharmaceutical components and production efficiency.

2. Food processing industry

It is suitable for vacuum packaging, fruit and vegetable dehydration, juice concentration, and vacuum degassing of dairy products, meeting food-grade cleanliness requirements, preventing food oxidation and spoilage, and extending shelf life.

3. Chemical industry 

It is used in solvent recovery, vacuum distillation, gas extraction, and vacuum operation of reaction vessels. It can withstand small amounts of condensable gases, and the stainless steel model is suitable for weakly corrosive media.

4. Paper manufacturing industry 

Used for vacuum dewatering of pulp and paper setting and drying, its high suction capacity quickly removes moisture from wet pulp, improving paper forming efficiency and quality while reducing energy consumption.

5. Environmental water treatment 

It is used in conjunction with vacuum water intake systems, vacuum degassing in aeration tanks, and sludge dewatering equipment to assist in wastewater biochemical treatment processes, stabilize negative pressure environments, and improve water treatment efficiency.

6. Machinery manufacturing industry 

It is suitable for processes such as vacuum adsorption, vacuum casting of molds, and vacuum impregnation of parts, and can precisely control the vacuum level to ensure processing accuracy and product quality.

1. Pre-power-on checks and preparations●

Media Preparation: Add clean, softened water or distilled water to the tank until the water level reaches 2/3 of the mark to prevent hard water scale buildup and blockage of the flow channel. If pumping corrosive gases, select a pump body made of a corresponding corrosion-resistant material and add a suitable working fluid. ●Component Inspection: Ensure the inlet and outlet valves are closed to prevent starting under load; check that the coupling connection is secure, without looseness or abnormal noise; test the motor insulation resistance to be ≥5MΩ, and ensure that the cable and sealing joints are undamaged and free from leakage. ●Rotation Confirmation: Briefly turn on the power switch and observe that the impeller rotation direction matches the arrow on the pump body. If it rotates in reverse, adjust the power phase sequence.

2. Start-up and vacuum level adjustment● 

First, open the water supply valve. After a stable water ring forms in the pump chamber, turn on the main power switch to start the motor. ● Slowly open the air inlet valve and observe the value using a vacuum gauge. Gradually adjust the valve opening to the required vacuum level. If a higher vacuum is required, the water circulation cooling system can be turned on to control the water temperature between 5℃ and 35℃. ● Closely monitor the pump for 5 minutes after startup: ensure the motor current does not exceed the rated value, the pump body does not vibrate violently, and there are no leaks of water or air at the seals.

3. Monitoring during operation ● 

Inspect every 1-2 hours: Maintain a stable vacuum level, pump body temperature ≤60℃, bearing temperature ≤70℃; if the vacuum level drops suddenly, prioritize checking for clogged inlet filter, insufficient water level in the water tank, or pipeline leaks. ● Never start without water to avoid impeller dry friction damaging the mechanical seal; do not operate at overrated vacuum for extended periods to prevent motor overload and overheating. ● When pumping gases containing condensable gases, periodically drain the liquid accumulated in the separator to prevent liquid backflow into the pump chamber.

4. Shutdown Procedure● 

Normal shutdown: First close the air inlet valve, then disconnect the power supply; after the impeller has completely stopped rotating, close the water supply valve; for long-term shutdown, drain the water tank and pump chamber to prevent freezing or corrosion from residual media. ● Emergency shutdown: Press the emergency stop button directly. After shutdown, troubleshoot the fault (such as overload, severe vibration, leakage), and restart only after eliminating potential hazards.

5. Safety Precautions ● 

Power must be disconnected and a "Do Not Operate" warning sign must be displayed during maintenance. Before disassembling pipelines, the pressure relief valve must be opened to balance the pressure to prevent injury from vacuum suction. ● After pumping corrosive, flammable, or explosive gases, the pump chamber must be rinsed with clean water. The electrical control cabinet must be placed in a dry and ventilated place to avoid short circuits caused by moisture.