Rotary Vane vacuum pumps can be found in an array of areas such as environmental engineering, food processing, industrial applications, and more.
A rotary vacuum pump essentially uses suction to remove air molecules from a specific area within an application. It uses the compression of air from inside the pump chamber to do so.
Based on our research, the best rotary vane vacuum pump would have to be the Welch DuoSeal 1374. The reason for this is because it has a high CFM, exhaust filter, and many other features that beat the competitors.
For those who like to find out more options or what a rotary vane vacuum pump is, how it works, what it’s used for.
Where Are Rotary Vane Vacuum Pumps Used? What Are They Used For?
Rotary Vane Vacuum Pumps are used in a variety of applications. They are mainly used in automotive and industrial areas. They may also be found in beverage processing machines for coffee, espresso, and soft drinks. Since these products are versatile, they provide various benefits for different situations. This is why they are used in so many professional fields.
The main idea behind it is that it plays a crucial role in the handling and production of material in its different stages. It is used in the formation of raw materials and can be used for the packaging of finished products.
The automotive field is one of the most dependent on rotary vane vacuum pumps. With the use of these pumps, automakers can manufacture different products that allow fluid to move through them such as brakes, power steering systems, automatic transmissions, and more. Additionally, the aviation industry relies on these pumps for the movement of many parts within an airplane.
Best Rotary Vane Vacuum Pumps
1.Hokkaido Vacuum Technology RH0160
The Hokkaido Vacuum Technology RH0160 is a vane vacuum pump with exceptional reliability. It is constantly being updated and optimized to fit the needs of those who use it. They focus the most on reliability and the economy of its operation.
The Hokkaido Vacuum Pump emits very low noise, vibration, and vibration. There is a direct connection of the vacuum pump air rings and cylinder on the flange motor. The construction is rather simple and the whole piece is lightweight.
The pump has a rated airflow of 60Hz and an ultimate pressure of 0.1. There is an 18-month warranty on the pump and tech support is provided.
The Welch DuoSeal 1374 is an ultra-durable pump with a low ultimate vacuum of less than 0.001 Torr. The belt-driven operation helps reduce wear and RMP for optimal durability. The DuoSeal vacuum pumps have always been known for their ruggedness.
The pump contains an exhaust filter that helps control the oil mist and it offers a pumping speed displacement of 23 CFM. There are large oil reservoirs that dilute contaminants to allow a higher tolerance for high contamination.
With the Welch DuoSeal comes an ISO NW-25 quick hose connector rather than the standard hose barb. This allows you to quickly and easily remove the hose from the pump if needed. Replacement barbs are easy to find since there are various sizes to fit any hose.
You should use a foreline trap or coldtrap with this pump because the oil backstreaming can contaminate the sample and the sample can then contaminate the pump oil. This leads to ultimate vacuum reduction and/or breakdown.
The Welch Vacuum 8917C-80 is a direct-drive rotary vacuum pump. It can be used with various applications with non-sustained operation. This includes freeze dryers that may be in harsh chemical locations.
Within the rotary vacuum pump is an integrated oil purification module. This is responsible for neutralizing oil pH and removing particulates. It also has a 1-⅛ 20 National Pipe Taper thread inlet that can connect to a 7/16” or 13/16” bore tube.
There is a ½ HP motor that makes the pump work with 230V, 50Hz input power. Additionally, it comes equipped with an International Electrotechnical Commission power cord with a Schuko Plug. It can put out 144 liters per minute of free air capacity with 0.001 Torr.
The Welch Vacuum Pump meets all CSA Group Standards for safety. Additionally, it has the CE mark for compliance with EEA conformity Standards.
4.Gardner Denver 1402N-50 Rotary Vane Vacuum Pump
The Gardner Denver 1402N-50 is a continuous duty cycle vacuum pump. It has a maximum vacuum of 3 x 10-2 mm Hg with the ballast and 3 x 10-3 mm Hg without the ballast. It’s also equipped with a ½ HP motor.
The vacuum pump is constructed with corrosion-resistant parts. It’s the perfect vacuum for pumping corrosive gases such as HOAC, F3CCO2H, HBr, and CI2. The pump itself takes the clean oil from the top of the reservoir and not from the bottom as direct-drive pumps do.
The large reservoir helps dilute contaminants and the pump only runs at 580 rpm. Due to the lower speeds, there is less wear, it operates at cooler temperatures, and there will be a longer service life.
Additionally, there is a bubbler tube in the reservoir that allows the purging of nitrogen gas and a reduced corrosion rate. All of these features allow for an extended pump oil life.
This Gardner Denver vacuum pump is almost exactly the same as the 1402N-50 model, except it has 115 Power (VAC) as opposed to 230 Power (VAC). it operates at a 59 dB(A) level, which is the same as the 1402N-50. Additionally, it has an oil capacity of 2.1 liters and a maximum temperature of 145 degrees Fahrenheit.
The Gardner Denver 1402N-01 spins at 580 RPM, leading to less wear, a longer life, and cooler operation. The Bubbler tube in the oil reservoir purges nitrogen gas, which also helps lower operating temperatures. Additionally, this will lead to a reduction in corrosion and an extended oil life.
The large oil reservoir also dilutes contaminants and clean oil is drawn from the top of the reservoir as opposed to the bottom, which is what direct-drive pumps do. The parts are all corrosion-resistant and they are ideal for pumping corrosive gases such as HBr, CI2, F3CCO2H, and HOAC.
The Welch CVRpro 16 is the upgraded version of the 9025A model. It features a 1.10 Hp motor and is constructed of aluminum. This is a direct drive vacuum pump that has been upgraded to increase reliability and provide extended service intervals versus other vacuum pumps like this one.
This vacuum pump consumes up to 36% less oil than that of comparable pumps. It comes equipped with a gas ballast, anti-suckback mechanism, thermal overload protection, and forced oil lubrication. It can be used in various applications such as vacuum ovens, concentrators, freeze-drying, and more.
Furthermore, it runs 10% cooler than other comparable pumps, which can slow corrosion. It has a 40% larger oil capacity than other pumps and it helps dilute harsh chemicals. It has a free air displacement of 60 Hz and operates at 55 dB(A). The motor spins at 1750 RPM and it has a CFM of 12.80.
Last on the list is the VIVOHOME 110V 1.4 HP Vacuum Pump. It is ideal for maintaining automotive air conditioning systems, HVAC work, and industrial needs that require high vacuum pull. It does this by removing moisture before the refrigerant is refilled. It comes with a manifold gauge set to measure pressure in certain refrigerant equipment.
It has a comfortable & portable design featuring an ergonomic grip handle. There is also 1 bottle of 500ml oil that comes with it so you can use it right away. To operate it, simply fill it with the oil needed. You can see the oil from the window that shows you quality and how much is in there.
This vacuum pump only weighs 18.81 pounds, making it easy to transport. It puts out 3.5 CFM from the 1.4 Hp motor. It’s ideal for maintaining R12, R22, R134a, and R5-2 air conditioning systems. It will not work on the R410a air conditioning systems.
Rotary Vane Vacuum Pump Problems
As with any product, rotary vacuum pumps can come with their fair share of issues. Here are some of the most common issues, why it’s causing the said issue, and what to do to fix it:
Pump Will Not Start
- The pump not starting can be caused by a number of issues. The main issue is that the pump isn’t connected properly. If this is the case, connect it the proper way and try again.
- If the motor protection switch isn’t set properly, it will not start.
- The operating voltage may not match the motor. If this is the case, replace the motor.
- If the oil temperature is below 53.6 degrees Fahrenheit, you need to heat the pump or the pump oil or use a different oil grade.
- If the oil is too vicious, change the oil to the correct grade.
- If the exhaust filter or line is clogged, replace, or clean it.
Pump Isn’t Reaching Ultimate Pressure
- If the gauge is unsuitable, use the correct one.
- If there is an external leak, check the pipe fittings. If they are loose, tighten them.
- If the float valve isn’t closing, repair the valve.
- If there isn’t enough lubrication due to the oil being contaminated, having a clogged oil filter or line, then you have to change the oil, replace the filters, or clean the oil line and casing.
- If there are dirty vacuum lines, clean them.
- If there is a low pump capacity, check the required capacity, and replace the pump if it needs to be.
Pressure Rises Too Quickly Once pump Is Switched off
- There may be a system leak
- The anti-suck back valve is malfunctioning and needs to be repaired.
Low Pumping Speeds
- If the dirt trap in the intake port is clogged, clean it out.
- If the exhaust filter is clogged, install new filter elements.
- If the connecting lines are too long or narrow, use bigger ones and shorter lines.
- If the anti-suck back valve is difficult to open, check the springs.
How A Rotary Vane Vacuum Pump Works
A rotary vane vacuum pump is a type of positive displacement pump. It has various parts such as housing, rotor, vanes, inlet valve, and the working chamber inside the housing. The rotor and vanes separate the working chamber into two compartments, each having variable volumes.
When the rotor turns, gas goes into the suction chamber and is then sealed off by the second vane. The gas that has been trapped will become compressed until the outlet valve opens due to atmospheric pressure. Since the valve is oil-sealed, when it opens, a small amount of oil will make its way into the chamber. It will then seal and lubricate the vanes against the housing.
The operating fluid, or pump oil, performs multiple tasks in a rotary vane pump. It is responsible for lubricating the moving parts, fills dead volume under the outlet valve and the small gap between the inlet and outlet. It then compresses the vane gaps and the working chamber while ensuring a proper temperature balance through the transfer of heat.
Additionally, there are single and two-stage versions. The two-stage umps have a lower pressure than the single-stage pumps. The gas ballast pumps have a lower pressure as well since the gas is only used at a high-pressure stage.
Rotary Vane Vacuum Pump Advantages & Disadvantages
Rotary vane vacuum pumps are used now more than ever. These are some of the most basic vacuum pumps to obtain when it comes to vacuum technology.
When looking at its advantages and disadvantages, it all comes down to the preference of who is using it and the economic interest of the supplier. Let’s take a look at some of those advantages and disadvantages:
One of the biggest advantages is that they are more robust than screw pumps. This helps lower maintenance costs over some time. They also last longer, generally around 10-15 years before an overhaul is required. They’re also cheaper than screw pumps.
Additionally, most of these can be repaired right on-site if they break down and it can then get back into operation quickly. Lastly, they use far less power than that of a liquid ring pump. They can also obtain a lower vacuum than the liquid pumps, eliminating the booster need for normal operations.
One of the biggest disadvantages to the rotary vane vacuum pump is that they have higher spare parts cost than a screw pump. The oil and filters have to be changed every 2000 operating hours.
Another disadvantage is that there is a bursting disc needed to protect from explosion due to the low design pressure and oil separator material. As far as low-temperature issues go, due to the viscosity increase of oil, heat tracing and insulation is needed.
Lastly, there is a limited range capacity compared to that of a liquid ring pump.
What To Look For When Buying A Rotary Vane Vacuum Pump
There are various kinds of vacuum pumps available, one of which is a rotary vane vacuum pump. Since these vacuum pumps are essential for ensuring certain applications run without issues, there are many things that you should look for before making your final decision.
What Is The Vacuum Depth Required?
The vacuum depth required is one of the main things that you should be considering when choosing a rotary vane vacuum pump. Low vacuum is used to move liquids through filters. The medium vacuum is used for solvent recovery. Medium to high vacuum can be used for plant extracts.
Additionally, high vacuum applications are best for semiconductor industries, optical devices, and more. If the product requires an ultra-high vacuum, this is for space study and certain nuclear reactors.
When you are choosing the vacuum depth and flow rate, consider the impact it will have on your system. If you have a smaller system, you won’t need a larger flow pump. If you have a large system, you will need a larger flow pump. You will need a better flow or you’ll be waiting longer to vacuum the system.
Do You Require or Want Corrosion Resistance? How About Oil?
If you are looking for a product that is going to last a long time, then you may need a corrosion-resistant pump. Additionally, you may also need a dry or oil-free pump. Before you choose one, you have to understand the driving forces that come with the application.
The boiling point of compounds is reduced by the vacuum and heating/stirring evaporated them into vapors. This in turn will turn them into condensation. Condensation causes corrosion. If this is the case, you will want a corrosion-resistant pump.
When it comes to oil-filled rotary vane pumps, these are actually recommended. They create the best vacuum for the price. They can run continuously for long periods and they are durable, easy to manage, and require no additional parts or equipment. Not to mention, they can easily adapt to vacuum pressing.
Single or Two-Stage
Two-stage pumps are going to cost more than a single-stage pump. Additionally, the two-stage design has two vanes and rotors. The first stage is responsible for generating the vacuum and the second stage cleans the system. This creates a deeper ultimate vacuum level. This means that the two-stage pumps produce more of a deeper vacuum than a single-stage.
Cubic Feet Per Minute (CFM)
If you’re wondering whether or not this matters, the answer is yes it does. This is the measure of how many cubic feet per minute of free air the pump will move. If you are operating multiple presses at one time or larger presses, you will want a higher CFM. You can use any 3-CFM or higher pump with all HD presses.