China OEM Dvp-180 4kw 181m3/H Petrochemical Pharmaceutical Industry Variable Pitch Dry Screw Vacuum Pump vacuum pump electric

Product Description


Working principle

The vacuum in dry screw pumps is created through 2 parallel-arranged screw rotors that rotate in opposite directions. These rotors trap the gas coming in through the inlet and deliver it to the gas discharge or pressure side. As the gas is getting compressed, there is no contact between the rotors. This does away with any need for the compression chamber to have any operating fluids or lubrication.
 The lubricant used to lubricate the gears and shaft seal is sealed in the gearbox by the shaft seal. The pump can be cooled either directly by circulating cooling water or by a cooling unit with fan and radiator.
The dry screw vacuum pump adopts a special rotor pitch design, compared with the ordinary rotor pitch design, reduce the energy consumption by about 30%, the temperature rise of the exhaust end is reduced by about 100 ºC, the reliability and stability of the operation of the product is greatly improved, can be suitable for any working conditions of vacuum.
The dry screw pumps can be widely used in solvent recovery, vacuum drying, concentration, crystallization, distillation and other processes in the chemical and pharmaceutical industries, vacuum extrusion and molding in the plastic and rubber industries, vacuum degassing in the metallurgical industry; vacuum degassing and drying in the solar energy, microelectronics, lithium battery and other industries.

Pump body and end caps:  high-strength cast iron.
Pump body and end caps:  high strength cast iron.
Screw rotor:                        ductile cast iron.
Anti-corrosion coating:        corrosion-resistant Hastelloy.
Synchronous gears:            alloy steel.
Radial lip seal:                     imported PTFE mixture or
                                            high-temperature resistant fluorine rubber;
Seal bushings:                    stainless steel surface covered with ceramic.

Flow chart


Main features

1. The screw rotor is designed with variable pitch structure, the ultimate vacuum can reach below 1Pa, which can meet all kinds of vacuum processing from atmosphere to high vacuum.
2. Oil free – Adapt to various special working conditions for reliable use.
3. It can operate reliably in the pressure range from atmosphere to several Pa.
4. No friction between moving parts, simple structure, lower operation and maintenance cost.
5. Nitrogen seal and composite seal design is optional, which has the benefit of good reliability, low cost of use, simple maintenance.
6. The rotor is dynamically balanced at high speed and the motor is connected by flange, with high concentricity, low vibration and low noise.
7. Hastelloy anti-corrosion coating is optional for rotor surface, condensable material is not easy to condense in the pump cavity, better corrosion resistance.
8. Compared with oil seal pump, liquid ring pump, there is no waste gas, no waste liquid, no waste oil emission, energy saving and environmental friendly.
It can be used alone or with Roots vacuum pump, air-cooled Roots vacuum pump, molecular vacuum pump, etc. to obtain an oil-free high vacuum system.

The benefit of dry screw vacuum pump compared to liquid ring vacuum pump:

    -Shorten the process cycle and improve production efficiency
    -Reduce water consumption
    -Save energy
    -Improve product quality
    -Can recover solvent by reducing the drying time of products
    -Reduce the cost of wastewater and waste gas treatment

A CASE in a pharmaceutical factory
Process introduction:The penicillin sodium salt solution is fed into the crystallization tank through vacuum. By steam heating, agitator stirring, and adding butanol, the water and butanol in the penicillin solution are pumped into the condenser and condensed into the liquid collecting tank, which can be reused.

Process requirements:
1. The volume of crystallization tank is 7.5m3, and about 4.5m3 penicillin solution is added in the process.
2. Before entering the crystallization tank, the water content of penicillin solution is about 20%, and after crystallization, the water content is required to be about 1%.
3. Vacuum feeding for 2h, then adding butanol for 30min, and then starting to crystallize. The process requires low temperature and fast speed, and the lower the temperature, the better the quality of penicillin. The shorter the reaction time, the better.
4. Vacuum degree requirements: the vacuum degree shall be kept above -0.097MPa. High vacuum degree can reduce the reaction temperature and shorten the reaction time.

The previous vacuum system was 2BE1252+air ejector, which is now transformed into a dry screw vacuum pump. The comparison table of test data is as follows:

vacuum system 2BE1252+ejector DVP 1600 screw pump
Feeding time (h) 2 1.5
Liquid temperature at the beginning of crystallization (ºC) 31.5 16.6
Crystallization time (h) 6 4.5
Time from crystallization to liquid coming out (min) 30 15
Crystal quality average good
Power consumption (KW) 45 37
Water consumption (m3) 26.4 0.72

Economic benefit analysis:

  Cost saving(USD) Remark
Water consumption and treatment 130 Water cost: $0.65/m3, water treatment: 30/m3
Power 15 $0.15/Kwh
Labor, production efficiency 43 Reduced from 6 hour to 4.5 hour
Sum up 188  

Please contact us for a detailed report of economic benefit analysis for your applications! 


Standard configuration:
Machine base, pump head, coupling, motor, driving screen, air inlet connector, check valve, vacuum gauge, manual filling valve exhaust port muffler.
Optional accessories:
Inlet filter, inlet condenser, solvent flushing device, nitrogen purging device, nitrogen sealing device, exhaust port condenser, solenoid filling valve, cooling water flow switch, temperature sensor, pressure transmitter.


Leak Detection    Metallurgy  Industrial furnace  Lithium Battery
Chemical, pharmaceutical  Wind tunnel test  Power Industry Vacuum coating
Microelectronics industry Drying Process  Packaging and Printing Solar Energy
Exhaust gas recovery       

Product Parameters

Technical data of Variable pitch Dry screw vacuum pump

Nominal pumping speed(50Hz) Ultimate pressure Nominal motor rating (50Hz)   Nominal motor speed  (50Hz)  Noise level   Lp Maximum
cooling water required
Suction Connection size Discharge Connection size Weight (Without Motor)
 m³/h Pa kw rpm dB(A) L/min mm mm Kg
DVP-180 181 2 4 2900 82 8 50 40 280
DVP-360 354 2 7.5 2900 83 10 50 40 400
DVP-540 535 2 11 2900 83 10 50 40 500
DVP-650 645 1 15 2900 84 20 65 50 600
DVP-800 780 1 22 2900 86 30 100 80 800
DVP-1600 1450 1 37 2900 86 40 125 100 1200

Technical data of Constant pitch Dry screw vacuum pump

Nominal pumping speed(50Hz) Ultimate pressure Nominal motor rating (50Hz)   Nominal motor speed  (50Hz)  Noise level   Lp Maximum
cooling water required
Suction Connection size Discharge Connection size Weight (Without Motor)
 m³/h Pa kw rpm dB(A) L/min mm mm Kg
DSP-140 143 5 4 2900 82 10 50 40 240
DSP-280 278 5 7.5 2900 83 20 50 40 350
DSP-540 521 5 15 2900 83 30 65 50 550
DSP-650 617 5 18.5 2900 84 45 65 50 630
DSP-720 763 5 22 2900 85 55 80 80 780
DSP-1000 912 5 30 2900 86 70 100 80 880

Note: The cooling water volume of the dry screw vacuum pump provided in the table is the amount under 20ºC room temperature water. When the dry screw vacuum pump uses cooling device, the cooling water will be increased, the difference of inlet and outlet water temperature is generally controlled below 7ºC is appropriate.






Q: What information should I offer for an inquiry?
A: You can inquire based on the model directly, but it is always recommended that you contact us so that we can help you to check if the pump is the most appropriate for your application.

Q: Can you make a customized vacuum pump?
A: Yes, we can do some special designs to meet customer applications. Such as customized sealing systems, speical surface treatment can be applied for roots vacuum pump and screw vacuum pump. Please contact us if you have special requirements. 

Q: I have problems with our vacuum pumps or vacuum systems, can you offer some help?
A: We have application and design engineers with more than 30 years of experience in vacuum applications in different industries and help a lot of customers resolve their problems, such as leakage issues, energy-saving solutions, more environment-friendly vacuum systems, etc. Please contact us and we’ll be very happy if we can offer any help to your vacuum system.

Q: Can you design and make customized vacuum systems?
A: Yes, we are good for this.

Q: What is your MOQ?
A: 1 piece or 1 set.

Q: How about your delivery time?
A: 5-10 working days for the standard vacuum pump if the quantity is below 20 pieces, 20-30 working days for the conventional vacuum system with less than 5 sets. For more quantity or special requirements, please contact us to check the lead time.

Q: What are your payment terms?
A: By T/T, 50% advance payment/deposit and 50% paid before shipment.

Q: How about the warranty?
A: We offer 1-year warranty (except for the wearing parts).

Q: How about the service?
A: We offer remote video technical support. We can send the service engineer to the site for some special requirements.

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After-sales Service: Online Video Instruction
Warranty: 1 Year
Nominal Pumping Speed(50Hz): 181 M3/H
Ultimate Pressure: 2 PA
Nominal Motor Rating(50Hz): 4 Kw
Nominal Motor Speed(50Hz): 2900 Rpm

screw vane pump

What are the cost considerations when purchasing and maintaining screw vacuum pumps?

When purchasing and maintaining screw vacuum pumps, several cost considerations come into play. Here’s a detailed explanation of the key factors to consider:

1. Initial Purchase Cost:

The initial purchase cost of a screw vacuum pump is an important consideration. The cost can vary depending on factors such as the pump’s capacity, specifications, features, and the manufacturer. Generally, screw vacuum pumps tend to have a higher upfront cost compared to some other types of vacuum pumps. However, it’s essential to evaluate the long-term benefits and performance advantages offered by screw vacuum pumps to determine their overall value for the specific application.

2. Energy Consumption:

Energy consumption is a significant ongoing cost associated with operating screw vacuum pumps. While screw vacuum pumps are known for their high efficiency, it’s important to consider the power requirements and energy consumption of the specific pump model. Opting for energy-efficient screw vacuum pumps can result in long-term cost savings by reducing electricity bills and minimizing the environmental impact. Additionally, pumps equipped with advanced control systems or variable speed drives allow for better energy optimization and can further enhance cost-effectiveness.

3. Maintenance and Service:

Maintenance and service costs are important considerations throughout the lifecycle of a screw vacuum pump. Regular maintenance is necessary to ensure optimal performance, reliability, and longevity of the equipment. The specific maintenance requirements and associated costs can vary depending on the pump model and manufacturer. It’s crucial to follow the manufacturer’s recommended maintenance schedule and guidelines. Some maintenance tasks may include changing seals, replacing filters, inspecting and lubricating bearings, and monitoring performance parameters. Proper maintenance can prevent costly breakdowns, extend the pump’s service life, and minimize unexpected repair expenses.

4. Spare Parts and Consumables:

When budgeting for screw vacuum pumps, it’s important to consider the cost of spare parts and consumables. Over time, certain components of the pump may require replacement, such as seals, gaskets, filters, or lubricants. The availability and cost of these spare parts can vary depending on the pump model and manufacturer. It’s advisable to inquire about the availability, pricing, and expected lifespan of consumables when purchasing the pump and factor these costs into the overall budget.

5. Operational Downtime:

Operational downtime can have significant cost implications for any industrial process. When a screw vacuum pump requires maintenance, repair, or replacement, it may result in downtime, leading to production interruptions, decreased efficiency, and potential revenue loss. Therefore, it’s important to consider the reliability, serviceability, and availability of technical support when choosing a screw vacuum pump. Opting for reputable manufacturers with a track record of providing reliable products and responsive customer support can help minimize operational downtime and mitigate associated costs.

6. Lifecycle Cost Analysis:

When evaluating the cost considerations of screw vacuum pumps, it’s beneficial to conduct a lifecycle cost analysis. This analysis takes into account not only the initial purchase cost but also the long-term operational costs, maintenance expenses, energy consumption, and expected service life of the pump. By considering the total cost of ownership over the pump’s lifespan, including factors like efficiency, reliability, and maintenance requirements, it becomes easier to assess the cost-effectiveness of different pump options and make informed purchasing decisions.

7. Warranty and After-Sales Support:

Considering the warranty and after-sales support offered by the pump manufacturer is essential. A comprehensive warranty can provide cost protection against potential defects or premature failures. Additionally, reliable after-sales support, technical assistance, and readily available spare parts can contribute to minimizing downtime, reducing repair costs, and ensuring the long-term performance of the screw vacuum pump.

In summary, the cost considerations when purchasing and maintaining screw vacuum pumps include the initial purchase cost, energy consumption, maintenance and service expenses, spare parts and consumables, operational downtime, lifecycle cost analysis, and warranty and after-sales support. By carefully evaluating these factors and assessing the specific needs of the application, businesses can make informed decisions to optimize cost-effectiveness and achieve reliable vacuum pump performance.

screw vane pump

Can screw vacuum pumps be used for vacuum packaging and sealing processes?

Yes, screw vacuum pumps can be used for vacuum packaging and sealing processes. Screw vacuum pumps offer several advantages that make them suitable for these applications. Here’s a detailed explanation:

1. Efficient Evacuation:

Screw vacuum pumps are known for their high pumping speed, which allows them to quickly evacuate the packaging chamber. By removing air and other gases from the packaging environment, screw vacuum pumps create the necessary vacuum conditions for packaging and sealing processes.

2. Consistent Vacuum Levels:

Screw vacuum pumps are capable of maintaining consistent vacuum levels throughout the packaging and sealing process. This is important to ensure reliable and uniform packaging results. The stable vacuum levels achieved by screw vacuum pumps help preserve product quality, extend shelf life, and prevent spoilage or degradation of packaged goods.

3. Control and Automation:

Screw vacuum pumps can be easily integrated into packaging and sealing systems, allowing for precise control and automation of the vacuum process. They can be equipped with sensors, controllers, and programmable logic controllers (PLCs) to monitor and adjust the vacuum levels, packaging parameters, and sealing operations. This enables efficient and repeatable packaging processes.

4. Versatility:

Screw vacuum pumps are versatile and can handle a wide range of packaging materials, including flexible pouches, bags, trays, and rigid containers. They can accommodate different sizes and shapes of packaging, making them suitable for various industries such as food and beverage, pharmaceuticals, electronics, and consumer goods.

5. Oil-Free Operation:

Many screw vacuum pumps are designed to operate without the use of lubricating oil or fluids. This oil-free operation eliminates the risk of oil contamination in the packaging process, making them particularly suitable for applications where cleanliness and hygiene are crucial, such as in the food industry or medical packaging.

6. Reliability and Durability:

Screw vacuum pumps are known for their robust construction and reliable performance. They are designed to handle continuous operation and can withstand the demanding conditions of packaging and sealing processes, including frequent start-stop cycles and exposure to moisture, dust, or other contaminants.

7. Cost-Effectiveness:

Using screw vacuum pumps for vacuum packaging and sealing processes can be cost-effective in the long run. They offer energy-efficient operation, low maintenance requirements, and long service life, resulting in reduced operating costs and improved productivity.

In summary, screw vacuum pumps are well-suited for vacuum packaging and sealing processes. Their efficient evacuation capabilities, ability to maintain consistent vacuum levels, control and automation features, versatility, oil-free operation, reliability, and cost-effectiveness make them a valuable choice for a wide range of industries that require vacuum packaging and sealing of products.

screw vane pump

What is a screw vacuum pump, and how does it operate?

A screw vacuum pump is a type of positive displacement vacuum pump that utilizes two or more intermeshing screws to create a vacuum by trapping and transporting gas or vapor from the inlet to the outlet of the pump. It operates based on the principle of volumetric compression.

The basic components of a screw vacuum pump include rotors (screws), a housing, and inlet and outlet ports. The rotors are typically helical in shape and have precise screw profiles. They are mounted on parallel shafts within the pump housing. As the rotors rotate, the intermeshing screws create sealed cavities or “pockets” between the rotor lobes and the housing.

The operation of a screw vacuum pump typically involves the following steps:

  1. Inlet Stage: At the beginning of the pump cycle, the rotors start rotating. As the cavity between the rotor lobes and the housing passes the inlet port, gas or vapor is drawn into the cavity. The volume of the cavity expands, creating a low-pressure zone at the inlet.
  2. Compression Stage: As the rotors continue to rotate, the cavity moves towards the outlet port, gradually reducing its volume. This reduction in volume compresses the gas or vapor trapped within the cavity, causing its pressure to increase.
  3. Outlet Stage: Finally, when the cavity reaches the outlet port, the compressed gas or vapor is discharged from the pump, and the cycle repeats.

It is important to note that screw vacuum pumps can operate with either dry or liquid seals. Dry screw vacuum pumps rely on tight clearances between the rotors and the housing to create an effective seal, while liquid-sealed screw vacuum pumps use a liquid sealant to prevent gas leakage and provide lubrication between the rotor surfaces.

Screw vacuum pumps offer several advantages in various applications:

  • High Efficiency: Screw vacuum pumps can achieve high volumetric efficiency due to their positive displacement design, enabling them to handle large volumes of gas or vapor efficiently.
  • Continuous Operation: These pumps are capable of continuous operation, making them suitable for demanding industrial processes requiring sustained vacuum levels.
  • Reliability: Screw vacuum pumps are known for their reliability and robust construction, making them suitable for harsh operating conditions.
  • Low Noise Levels: Compared to other types of vacuum pumps, screw vacuum pumps often produce lower noise levels during operation.
  • Wide Range of Applications: Screw vacuum pumps find applications in various industries, including chemical processing, pharmaceuticals, food and beverage, wastewater treatment, and more.

In summary, a screw vacuum pump is a positive displacement pump that utilizes intermeshing screws to create a vacuum by trapping and compressing gas or vapor. Its operation involves drawing gas into the cavity, compressing it, and then discharging it. Screw vacuum pumps offer high efficiency, reliability, and suitability for a wide range of applications, making them a popular choice in many industries.

China OEM Dvp-180 4kw 181m3/H Petrochemical Pharmaceutical Industry Variable Pitch Dry Screw Vacuum Pump   vacuum pump electricChina OEM Dvp-180 4kw 181m3/H Petrochemical Pharmaceutical Industry Variable Pitch Dry Screw Vacuum Pump   vacuum pump electric
editor by Dream 2024-04-19