2BV5-161 Liquid Ring Vacuum Pump for Plastic Extrusion and EPS Foam

The vacuum pump plays an important role in many plastic processing lines. During plastic extrusion and EPS foam production, stable vacuum helps remove air, moisture, and volatile gases from the process. When the vacuum level changes too much, it can affect product quality and production stability. The 2BV5-161 liquid ring vacuum pump is one option for these applications, especially when a relatively large vacuum flow is required.

2BV5-161 Parameters for Plastic Processing

According to the supplied technical data, the 2BV5-161 has a suction capacity of 8.33 m³/min, which is equal to about 500 m³/h. Its limited vacuum is 15 mbar, with a 970 r/min pump speed. The motor power is 20 kW, while the liquid flow rate is 331 L/min. The motor protection grade is IP54, and the noise level is 74 dB(A). The listed pump weight is not provided in the supplied table.
These parameters give a useful starting point when selecting a vacuum pump for plastic extrusion or EPS equipment. The required suction capacity should still be checked against the actual process vacuum, gas temperature, vapor load, piping resistance, and operating conditions.

Why Vacuum Matters in Plastic Extrusion

During plastic extrusion, the material can contain moisture, trapped air, and other volatile substances. These gases need to be removed before they affect the final product. A vacuum system connected to the extruder can continuously extract these unwanted gases from the process.
A stable vacuum can help reduce bubbles and voids in the material and support more consistent extrusion. It can also help remove moisture and volatile components from certain plastic materials. However, the required vacuum level depends on the polymer, extrusion temperature, material moisture, and extruder design.
The 2BV5-161 can provide up to 8.33 m³/min of suction capacity while operating at 970 r/min. This makes it suitable for applications where the vacuum system needs a relatively high gas flow rather than only a small vacuum load.

2BV5-161 for Plastic Extruder Vacuum Degassing

A typical extrusion vacuum system connects the vacuum pump to the degassing section of the extruder. During operation, gases released from the molten plastic enter the vacuum line and are then removed by the pump.
The 2BV5-161 can be considered when the extrusion line requires a suction capacity around 8.33 m³/min. Before final selection, engineers should check whether the pump can maintain the required working vacuum under the actual gas load.
The piping layout is also important. A long or narrow vacuum pipe can increase pressure loss and reduce the effective performance of the system. Filters, separators, condensers, and other components may also be needed depending on the material and process.

2BV5-161 for EPS Foam Production

EPS foam production is another application where vacuum equipment can be useful. During foam processing, gases and vapors can enter the vacuum system, and the vacuum level needs to remain stable for consistent processing conditions.
The 2BV5-161 provides 8.33 m³/min suction capacity and a limited vacuum of 15 mbar. Its 20 kW motor and 331 L/min liquid flow rate provide the operating capacity shown in the supplied specifications.
For an EPS production line, however, the pump should not be selected only from the maximum suction capacity. The actual vacuum requirement, gas composition, vapor content, operating temperature, and continuous running conditions should all be considered.

Working Liquid and Cooling Requirements

A liquid ring vacuum pump uses working liquid to form the liquid ring inside the pump. The working liquid also affects the pump's ability to maintain stable operation.
For the 2BV5-161, the supplied data lists a liquid flow rate of 331 L/min. The actual working-liquid arrangement should be designed according to the process conditions and manufacturer requirements.
If the gas entering the pump contains a large amount of vapor, the working-liquid temperature becomes especially important. Higher liquid temperature can reduce the available vacuum performance. For this reason, the cooling-water system, separator, piping, and working-liquid circulation should be considered together with the vacuum pump.

What Should Be Checked Before Selecting 2BV5-161?

The first point is required suction capacity. The 2BV5-161 is listed at 8.33 m³/min, or approximately 500 m³/h. The actual process gas load should be lower than the usable pump capacity under the required working conditions.
The second point is working vacuum. The listed limited vacuum is 15 mbar, but the limited vacuum value should not be treated as the normal operating point. The vacuum required by the extrusion or EPS process should be checked against the pump performance curve.
The third point is motor power. The 2BV5-161 uses a 20 kW motor according to the supplied table. Electrical supply, starting conditions, continuous operating load, and local motor requirements should be confirmed before ordering.
The fourth point is liquid flow. The listed liquid flow rate is 331 L/min. If the system uses a closed-loop working-liquid circuit, the separator, heat exchanger, circulation pump, and cooling capacity should be matched to the complete system.
The fifth point is installation. The vacuum pipe should be kept as short and direct as practical, with suitable pipe diameter and proper sealing. Any leakage on the vacuum side can increase the workload of the pump and make it difficult to maintain the required vacuum.

2BV5-161 Can Be Part of a Complete Vacuum System

For plastic extrusion and EPS foam production, the vacuum pump is only one part of the complete system. Depending on the process, the system may also include a vacuum separator, filter, condenser, cooling system, vacuum gauge, valves, and piping.
A separator can help prevent liquid or solid particles from entering the pump. A filter can protect the pump from dust and process particles. If the extracted gas contains significant vapor, a condenser can reduce the vapor load before the gas reaches the vacuum pump.
This system-based approach can be more useful than simply selecting a pump based on its maximum capacity.

Conclusion

The 2BV5-161 liquid ring vacuum pump has a listed suction capacity of 8.33 m³/min, approximately 500 m³/h, a limited vacuum of 15 mbar, a 20 kW motor, a pump speed of 970 r/min, and a liquid flow rate of 331 L/min. These specifications make it a potential option for plastic extrusion vacuum degassing and EPS foam production where the process requires relatively high vacuum gas flow.
For a practical selection, the required working vacuum, gas load, vapor content, working-liquid temperature, piping resistance, continuous operating time, and complete vacuum system configuration should be checked together. This helps ensure that the selected 2BV5-161 can provide stable vacuum performance under the actual production conditions.

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