Product Description


Product Description

The reciprocating pump operates on the positive displacement principle. The piston of a reciprocating piston pump goes back and forth in a cylinder. With the help of a connecting rod, the piston is connected to the crankshaft. The connecting rod moves as the crankshaft rotates, causing this piston to move. The crankshaft is connected to a rotating motor.

With a suction valve and a delivery valve, the pump cylinder is linked to a suction pipe and a discharge pipe. The input and exit valves act as check valves, allowing only 1 direction of fluid flow. Through the input valve, the fluid is sucked into the cylinder. The outlet valve allows the fluid to exit the pump's cylinder.

Main features

1. Compact structure design, good rigidity, even force on moving parts, reducing the wear of moving parts and prolonging service life.
2. Compared with other pumps of the same specification, it saves electricity by 1/3, cooling water can be used twice, and the floor space is reduced by 2/3;
3. In the crankcase, the oil pump is used to force oil supply, with better lubrication effect.
4. Smooth running, low vibration, low noise
5. Because of the oil-free lubrication, clean vacuum can be obtained, which rejects the pollution of the process system by air reflux after temporary stop;
6. Add recovery device, can recover the liquid in the system (such as alcohols), can also recover the gas in the system (such as hydrogen chloride into hydrochloric acid), such as adding vacuum puff collector, can also extract a small amount of dust;
7. In the process of use, no need to add lubricant, easy and simple maintenance.



WLW series oil-free vertical vacuum pump is the main equipment to obtain rough vacuum. It adopts unique technical structure, with better performance and more convenient use. It is also the replacement product of W type pump. It is widely used in vacuum distillation, vacuum drying, vacuum filtration, vacuum crystallization, vacuum smelting, vacuum infiltration and other industrial sectors such as petrochemical, pharmaceutical, food smelting, electronics, etc. to extract gases such as atmosphere, water vapor, chlorine, hydrogen chloride, sulfur dioxide, etc

Technical data

Model WLW -50 WLW -70 WLW -100 WLW -150 WLW -200 WLW -300 WLW -400 WLW -600 WLW -1200
Pumping volume L/s 50 70 100 150 200 300 400 600 1200
Vacuum mmhg 20 20 20 20 20 20 20 20 20
Rotational speed r/min 320 380 350 310 300 300 300 300 300
Electric power KW 4 5.5 7.5 11 15 22 28.5 37 45
Inlet and exhaust caliber 50 50 100 100 125 145 145 180 220
Pump temperature rise ° C ≤40 ≤40 ≤40 ≤40 ≤40 ≤40 ≤50 ≤50 ≤50
Noise qB(A) ≤70 ≤70 ≤70 ≤70 ≤70 ≤70 ≤85 ≤85 ≤85
Inlet and outlet joint G1/2 G1/2 G1/2 G1/2 G1/2 G1/2 G1 G1 G1
Weight Kg 500 520 600 800 900 1200 1800 2600 3500


Pressure diagram

Additional Notes:
1. The data provided above are the average values measured at atmospheric pressure as standard and room temperature of 20C.
2. The above table-2 is the technical parameters of the two-stage pump;
3. One standard atmospheric pressure is equal to 0.101Mpa.


Model WLW-50 WLW-70 WLW-100 WLW-150 WLW-200 WLW-300 WLW-600
L 1100 1100 1270 1440 1440 1680 2150
L1 150 150 160 180 180 200 220
L2 400 400 475 480 540 640 855
L3 470 470 610 790 790 820 1100
B 550 550 600 750 750 840 950
B1 325 325 360 404 450 500 610
H 1170 1170 1360 1360 1460 1560 1660
H1 910 910 1115 1175 1175 1275 1375
H2 780 780 965 995 995 1095 1195
H3 400 400 400 400 400 400 400
H4 300 300 300 300 300 300 300
H5 300 300 300 300 300 300 300
H6 160 160 160 160 160 160 160
D 110 110 175 175 210 210 300
D1 50 50 100 125 125 145 180
d 8 8 10 12 12 14 16
M 90 90 145 175 175 195 250
n 4 4 4 4 4 4 4



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.

After-sales Service: Online Video Instruction
Warranty: 1 Year
Oil or Not: Oil Free
Structure: Reciprocating Vacuum Pump
Exhauster Method: Positive Displacement Pump
Nominal Pumping Speed(50Hz): 50L/S

Vacuum Pump

Basic knowledge of vacuum pump

A vacuum pump is used to create a relative vacuum within a sealed volume. These pumps take gas molecules out of the sealed volume and expel them, leaving a partial vacuum. They can be used in a variety of applications, including medicine and laboratory research. This article will cover the basics of vacuum pumps, including how they operate and the materials they use. You will also learn about typical applications and fees.

How it works

A vacuum pump is a pump that removes air from a specific space. These pumps are divided into three types according to their function. Positive displacement pumps are used in the low vacuum range and high vacuum pumps are used in the ultra-high vacuum range. The performance of a vacuum pump depends on the quality of the vacuum it produces.
A vacuum pump creates a partial vacuum above the surrounding atmospheric pressure. The speed of the pump is proportional to the pressure difference between the ambient atmosphere and the base pressure of the pump. Choose a base pressure for a specific process, not the lowest possible pressure in the system.
A scroll pump is also a type of vacuum pump. This type of pump consists of two scrolls, the inner scroll running around the gas volume. It then compresses the gas in a spiral fashion until it reaches the maximum pressure at its center. The inner and outer scrolls are separated by a polymer tip seal that provides an axial seal between them. Its pumping speed ranges from 5.0 to 46 m3/h.
Another type of vacuum pump is the screw pump, which uses two rotating screws in one chamber. The screw in the screw pump is a left-handed screw, and the other is a right-handed screw. The two screws do not touch each other when engaged, preventing contamination of the medium. They also feature high pumping speeds, low operating costs and low maintenance requirements.
The vacuum pump consists of several parts such as rotor and base. These components create an area of ​​low pressure. Gas and water molecules rush into this low pressure area, where they are sucked into the pump. The pump also rotates, preventing fluid leakage to the low pressure side.
The main function of a vacuum pump is to remove gas particles from an enclosed space. It does this by changing gas molecules between high and low pressure states. A vacuum pump can also generate a partial vacuum. There are several types of vacuum pumps, each designed to perform a specific function, so it is important to choose the right type for your application.

Vacuum Pump Materials

There are two main materials used in vacuum pumps: metal and polyethylene. Metal is more durable, while polyethylene is cheaper and more flexible. However, these materials are not suitable for high pressure and may cause damage. Therefore, if you want to design a high-pressure pump, it is best to use metal materials.
Vacuum pumps are required in a variety of industrial environments and manufacturing processes. The most common vacuum pump is a positive displacement vacuum pump, which transports a gas load from the inlet to the outlet. The main disadvantage of this pump is that it can only generate a partial vacuum; higher vacuums must be achieved through other techniques.
Materials used in vacuum pumps vary from high to rough vacuum pumps. Low pressure ranges are typically below 1 x 10-3 mbar, but high vacuum pumps are used for extreme vacuum. They also differ in manufacturing tolerances, seals used, materials used and operating conditions.
The choice of vacuum pump material depends on the process. The vacuum range and ultimate pressure of the system must be carefully analyzed to find the right material for the job. Depending on the purpose of the pump, a variety of materials can be used, from ceramic to plastic substrates. When choosing a vacuum pump material, be sure to consider its durability and corrosion resistance.
Dry and wet vacuum pumps use oil to lubricate internal parts. This prevents wear of the pump due to corrosion. These types of pumps are also recommended for continuous use and are ideal for applications where the gas is acidic or corrosive. Therefore, they are widely used in the chemical and food industries. They are also used in rotary evaporation and volatile compound processing.
Positive displacement pumps are the most common type. They work by letting gas flow into a cavity and venting it into the atmosphere. Additionally, momentum transfer pumps, also known as molecular pumps, use high-velocity jets of high-density fluids to transport air and gases. These pumps are also used for medical purposes.

Typical application

Vacuum pumps are used to remove large amounts of air and water from the process. They are used in various industries to improve performance. For example, liquid ring vacuum pumps are used in packaging production to produce plastic sheets in the desired shape and size. Large-capacity suction pumps are used in the chemical industry to improve the surface properties of materials and speed up filtration.
There are two basic principles of vacuum pumps: entrapment and gas transfer. Positive displacement pumps are suitable for low to medium vacuums, while momentum transfer and retention pumps are suitable for high vacuums. Typically, high vacuum systems use two or more pumps working in series.
There are three main categories of vacuum pumps: primary, booster, and secondary. Their working pressure ranges from a few millimeters above atmospheric pressure. They also have several different technologies, including positive displacement, gas transfer, and gas capture. These pumps transport gas molecules through momentum exchange. Typically, they release gas molecules at roughly the same rate as they entered. When the process is complete, the gas molecules are slightly above atmospheric pressure. The discharge pressure is equal to the lowest pressure achieved, which is the compression ratio.
Vacuum pumps are widely used in all walks of life. They can be found in almost every industrial sector, including food processing. For example, they are used to make sausages and food products. In addition, they are used in landfill and digester compressors. They can also be used to build solar panels.
Oil lubricated vacuum pumps are currently the most energy-efficient vacuum pumps. These pumps are suitable for a variety of industrial applications including freeze drying and process engineering. These pumps use oil as a sealant and coolant, which makes them ideal for a variety of applications. These pumps are also very sensitive to vibration.
Another type of vacuum pump is a turbomolecular pump. These pumps have multiple stages and angled vanes. Unlike mechanical pumps, turbomolecular pumps sweep out larger areas at higher pumping speeds. In addition, they can generate ultra-high oil-free vacuums. Additionally, they have no moving parts, which makes them ideal for high vacuum pressures.
Vacuum Pump

Vacuum Pump Cost

Annual maintenance costs for vacuum pumps range from $242 to $337. The energy consumption of the vacuum pump is also a consideration, as it consumes electricity throughout its operating cycle. For example, an electric motor for a 1 hp pump uses 0.55 kW/hr, which equates to 2,200 kWh of energy per year.
Energy cost is the largest part of the total cost of a vacuum pump. They are usually four to five times higher than the initial purchase price. Therefore, choosing a more energy efficient system can reduce the total cost of ownership and extend the payback period. For many clients, this can be millions of dollars.
A vacuum pump works by compressing gas as it enters a chamber. This pushes the gas molecules towards the exhaust. The exhaust gas is then vented to the atmosphere. A special spring-loaded vane seals the pump's chamber, creating an airtight seal. Specially formulated oils are also used to lubricate, cool and seal rotors.
Vacuum pumps are not cheap, but they have many advantages over water suction. One of the main advantages of vacuum pumps is their flexibility and reliability. This is an industry-proven solution that has been around for years. However, the initial cost of a vacuum pump is higher than that of a water aspirator.
If the vacuum pump fails unexpectedly, replacement costs can be high. Proper maintenance can extend the life of your system and prevent unplanned downtime. However, no one can predict when a pump will fail, and if a pump does fail, the cost can far exceed the cost of buying a new pump. Therefore, investing in preventive maintenance is a wise investment.
There are many types of vacuum pumps, not all of which are suitable for the same type of application. Make sure to choose a pump with the power required for the job. It should also be able to handle a variety of samples.

China wholesaler Wlwa-50 Standing Reciprocation Vacuum Pump (oil free)   with Great quality China wholesaler Wlwa-50 Standing Reciprocation Vacuum Pump (oil free)   with Great quality
editor by CX 2023-04-21