rotary vane vacuum pump installation method

Rotary vane vacuum pump should be placed horizontally. With the pump operation almost no oscillation, generally can not be fixed. There are metric screw holes on the damping pad at the bottom of the rotary vane vacuum pump to fix the pump. Do not push or pull the pump on the ground to avoid damaging the damping pad. In order to ensure excellent cooling of the rotary vane vacuum pump, the cooling air inlet and outlet of the pump should be more than 30cm away from the surrounding objects. 

In order to facilitate repair, it is proposed to leave 0.4m space in front of the air inlet and exhaust port of rotary vane vacuum pump. In order to facilitate the oil drain, the base with oil drain pan can be installed, and the pump delivered by rotary vane vacuum pump does not carry oil. After the installation, slowly inject the regular vacuum pump oil through the oil filling port to 3 / 4 of the oil window height.

The electrical connection of rotary vane vacuum pump and the electrical wiring of rotary vane vacuum pump should be carried out by professional electricians. It is necessary to check the rotation direction of the motor after the wiring of the three-phase asynchronous motor of the rotary vane vacuum pump is completed. The correct rotation direction of the motor is: from the fan end of the motor tail, the rotation direction of the motor shaft is counterclockwise.

When checking the rotation direction of rotary vane vacuum pump, the suction port should be turned over or covered with rubber plate (thickness over 4mm), and the power supply should be connected for 2 ~ 3 seconds. If the rotation direction is correct, you will feel strong suction or rubber plate tightly at the suction port. If it is reversed, adjust two of the three power lines arbitrarily.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Selection of water ring vacuum pump model

Try to select the standard with lower rotation speed. On the premise of reaching the same pumping volume, try to select the pump with lower rotation speed. The larger pump consumes less specific power, that is, higher power. In addition, the larger standard water ring vacuum pump has long blades (that is, long flow channel), small curvature of fluid, approximate straight streamline, and fluid activity is close to slow flow. 

Considering the influence of water temperature, the temperature of most make-up water is between 25 ℃ and 35 ℃. Therefore, when selecting pumps, the air volume should be appropriately increased compared with that in the technical documents. When installing pipelines, a thicker suction pipe should be selected to reduce the loss of resistance, and a right angle elbow should be cut as far as possible to improve the suction work The intention of the rate.

When the exhaust pressure is slightly positive, the influence of the increase of the exhaust pressure and the increase of the backflow in the pump cavity on the pumping volume should be considered. Because the increase of the exhaust pressure will increase the shaft power of the pump and the power of the driving machine, the experimental function curve and the corresponding skill data should be referred to in the selection to fully meet the requirements.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Negative pressure roots blower

Now many customers can't tell what is negative pressure roots blower, what is roots vacuum pump, what is vacuum pump and what is roots blower. They also made some mistakes during the acquisition. Now, to sum up the following points, in Roots blower profession, roots vacuum pump is what most people call negative pressure roots blower. Its principle is the same as roots blower. It belongs to volume reversal blower Machine. 

A reverse compressor which uses two blade rotors to make relative motion in the cylinder to compress and transport gas. The roots blower is simple in structure and easy to make. It is suitable for gas transportation and pressurization in low pressure occasions. Conceptually, roots blower is a kind of usage in vacuum pump. Positive pressure blowing is used with large air volume, which can not be completed by vacuum pump, such as water tank aeration, oxygen supply, powder transportation, etc.

There are several kinds of vacuum pumps, such as water ring vacuum pump, rotary vane vacuum pump, steam jet pump, molecular pump, reciprocating vacuum pump, fixed vane vacuum pump, slide valve vacuum pump, residual cycloid vacuum pump, roots vacuum pump, etc. the principle is to use the skewed rotor in the pump cavity to form the gas discharged from the pump after the volume change of rotation, mainly in the suction process.

When the volume of suction cavity increases, the vacuum degree decreases. When the gas in the container is sucked into the pump cavity, the volume becomes smaller and the pressure increases during the exhaust process. After all, the inhaled gas is discharged out of the pump through the oil seal. In terms of parameters, most of the vacuum degree of the vacuum pump is higher than that of the roots vacuum pump, and the suction volume is also larger than that of other roots vacuum pumps, so the negative pressure can be smaller than that of the roots vacuum pump.


Oil Free Vacuum Pump Selection

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Development of Roots vacuum pump performance

When roots vacuum pump works, rotor and rotor, rotor and pump body are not in contact with each other, so there is no direct wear. However, due to the small clearance (generally 0.10 ~ 0.25 mm), the transmission gear is worn after long-term operation. When the backlash is greater than the minimum clearance between rotors, it will collide and cause failure. At this time, the gear should be replaced. Through the performance of the practical application value ability of Roots vacuum pump, enhance the continuous promotion of the actual development ability of the product, further reflect the development advantage of the product strength with the reliable advantage level, expand the overall improvement of the practical performance, promote the improvement of the actual performance of all aspects of the product, improve the driving force of the practical performance of the product, and make it full use of the value strength of the overall development We should speed up the exertion of the advantage level of its product application, make use of its reliable practical performance, and enhance the embodiment of its product application level. 

At the same time, we should also speed up the improvement of the product advantage level of Roots vacuum pump, expand the exertion of the product application strength and the overall performance level, expand the continuous improvement of the overall application strength of the product, fully reflect the exertion of the product value strength, and further enhance the actual application advantage level with reliable product performance.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Application and development of water ring vacuum pump

In the development of water ring vacuum pump value strength play, expand its practical application and quality ability of the drive, constantly improve the overall use of products and quality strength of the drive, reflecting the improvement of the overall use of strength, so as to expand the actual use of the strength of the performance, from all aspects of practical performance, increase the promotion of the role of the overall advantage of the product, the use of product performance belt Dynamic, with reliable practical advantages to enhance the strength of its products, so as to speed up the embodiment of its actual application effect. 

To speed up the overall strength of the application performance development of water ring vacuum pump, promote the embodiment of its product application and other practical value, and strengthen the improvement of product application and performance practical effect, Schindler vacuum pump in order to reflect the practical effect of the product performance of water ring vacuum pump, it is necessary to expand the embodiment of its product performance with the overall driven quality strength, so as to make it the basis of strength performance in all aspects On this basis, enhance the quality and effect of products, expand the overall development of all aspects of the use of strength.

From all aspects of the use of the effect of the product reflects the use of the basis, so that in a reliable level of overall application, expand its product strength, further expand the use of performance, to expand the use of all aspects of its strength, enhance the overall improvement of product performance strength, expand its quality performance.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Closed loop system of liquid ring vacuum pump

It is different from single-stage and double-stage vacuum pumps. It is a single-stage vacuum pump and a double-stage vacuum pump. 

1. Separator pressure gauge: if pressure may be generated in the separator, a pressure gauge shall be installed on the separator;

2. Suction port vacuum check valve: in order to prevent backflow when the vacuum pump / compressor is shut down, it is generally necessary to install a vacuum check valve or pneumatic valve at the inlet of the pump;

3. Working fluid booster pump: if the working fluid supply of the pump is insufficient or the working pipeline resistance is large, the working fluid booster pump can be installed;

4. Air port filter: if foreign matters may enter the pump in the system and pipeline, a filter or filter screen shall be installed at the suction port of the pump;

5. Cavitation protection pipeline: if the suction pressure of the vacuum pump is close to the saturated vapor pressure of the working fluid, a cavitation protection pipeline should be installed between the vacuum pump and the separator;

6. Exhaust condenser: if it is necessary to capture or recover the condensable gas at the exhaust port, a condenser can be installed at the exhaust port of the gas-liquid separator;

7. Liquid replenishing port of separator: if the working fluid is insufficient, the working fluid can be replenished properly from the liquid replenishing port;

8. If the vacuum pump has other special requirements, the corresponding accessories can be installed.


Rotary Vane Vacuum Pump Working Principle

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump 

Radial exhaust water ring vacuum pump

The utility model discloses a radial exhaust water ring vacuum pump with controllable flow, which comprises a pump body, a first base plate, a second base plate and a base, the upper surface of the pump body is provided with a water tank, the interior of the water tank is provided with a blocking block, the first base plate is located at the left end of the pump body, and the interior of the first base plate is interspersed with an air outlet, the second base plate is located at the right end of the pump body, and the connecting block is arranged inside the water tank Springs are evenly distributed on the lower surface of the connecting plate, a cavity is arranged on the right side of the second base plate, a baffle is arranged above the pull ring, an air inlet is connected with the right end of the cavity, and the base is located below the pump body. 

The radial exhaust water ring vacuum pump with controllable flow can control the gas flow by rotating the baffle in the air inlet, and the filter plate can filter out the particles in the gas, so as to avoid the damage of the parts inside the pump body, and the pump body can be well protected by the extension and extension of the outrigger and the protective rod.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Roots water ring vacuum unit

Roots water ring vacuum unit is composed of roots pump as main pump and water ring pump as front pump in series. It can be understood as two main points: water ring pump and roots pump. 

Both roots pump and roots vacuum unit have a number of utility model patents, for example, the series Roots vacuum unit that can be started at the same time solves the shortcomings of the start-up mode of Roots vacuum unit in the prior art, such as long time consuming, low efficiency and large energy consumption, mainly including the front vacuum pump and roots vacuum pump driven by the motor of Roots vacuum pump An exhaust port is arranged on the roots vacuum pump, an air suction port is arranged on the roots vacuum pump, a pneumatic ball valve is arranged between the front vacuum pump and the roots vacuum pump, and the motor, the pneumatic ball valve and the differential pressure detection device of the front vacuum pump are all controlled by the control cabinet. The beneficial effect of the utility model is: on the premise of ensuring that the motor of the roots vacuum pump is not overloaded, the pumping speed is increased by controlling the pressure difference between the inlet and outlet of the roots vacuum pump, so as to shorten the starting time of the vacuum unit.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Mechanical seal screw vacuum pump with external cooling device

 The utility model discloses a mechanical seal screw vacuum pump with an external cooling device, which comprises two screw rotors and an input shaft driving the two screw rotors to rotate. The two ends of the screw rotor are provided with a mechanical seal, the extension of the input shaft and the atmospheric side are provided with a mechanical seal; the mechanical seal part is provided with a cooling cavity; the screw vacuum pump is provided with a device for taking away the heat of the mechanical seal The external cooling circulating device is a circulating circuit composed of oil tank, oil pump and oil separator. 

Compared with the prior art, the vacuum pump of the utility model adopts mechanical seal and forced circulation cooling, which completely blocks the leakage between the front of the pump and the cooling chamber as well as between the cooling chamber and the atmosphere; the external circulation cooling device forces the mechanical seal to cool down, with low working temperature and sufficient lubrication, which increases the service life and reliability of the overall transmission parts, and has the advantages of low energy consumption, good cooling effect and safe operation It is fully reliable.

Roots Blower In River Aeration Treatment

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

dry vacuum pump structure and characteristics

Vacuum pump is a device or device that uses mechanical, physical, chemical or physicochemical methods to exhaust the pump to get vacuum. Dry vacuum pump users in the application of vacuum pump knowledge need to master the following structure and characteristics, hope to help you. 

The configuration of the vacuum pump body determines the overall structure of the pump. The entrance and exit are arranged in a horizontal and vertical structure for easy assembly and cable connection. However, the center of gravity of the pump is high, the stability of high-speed operation is poor, so this type is used for small pumps.

The horizontal pump is at the suction port and the exhaust port is below. The piping of the vacuum system is easy to install and connect, sometimes it can be discharged from the horizontal direction of the exhaust. That is to say, the exhaust directions are perpendicular to each other. At this time, in addition to the bypass valve at the other end of the exhaust pipe, the exhaust port can also be opened from left to right. The pump structure has low center of gravity and high speed stability. Generally speaking, large and medium pumps use this structure.

The two rotor shafts of the pump are installed perpendicular to the horizontal plane. The structure is easy to control the assembly clearance, the rotor is easy to install, and the pump area is small. However, the center of gravity of the pump is the height and the disassembly of the gear, and the lubrication mechanism is also very complex.

industrial vacuum pumps,vacuum furnaces

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Power supply mode of water ring vacuum pump

Water ring vacuum pump needs power supply in use and can be used in power supply equipment normally, but the power supply method is different. The efficiency varies with the mode of power supply. Here we introduce the power supply mode. 

1. The water ring vacuum pump has a large specific gravity because the extraction medium is "water or liquid". The working medium of micro vacuum pump and micro air pump is "gas" with light specific gravity. Therefore, the working current of the vacuum pump is generally larger than that of the latter, about 1 ~ 10 amperes, but the working current of the latter is generally not from a few hundred milliamperes to a few amperes.

2. Battery is the general term of battery. The principle is different from the dry battery, because it can provide large current and power, so it is widely used in electric vehicles, cars and other mobile vehicles, agricultural spraying, field sampling and other power shortage.

3. The common dry battery (such as 1.5V No.1 battery) has large internal resistance and small current supplied by itself. Most of the voltage is consumed by internal resistance, so the voltage drop is fast. From the point of view of power and service time, it is suitable for the power supply of water supply ring vacuum pump.

Roots Vacuum Pump

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump 

Roots air jet water ring vacuum unit

Jzj (P) roots air jet water ring vacuum unit is composed of Roots vacuum pump, air jet pump and water ring vacuum pump in series. The unit has high vacuum degree, high pumping efficiency, low noise, stable operation, compact structure, small floor area, simple operation and convenient maintenance. 

Jzj (P) roots air jet water ring vacuum unit can be widely used in vacuum distillation, material dehydration in pharmaceutical and chemical industries, vacuum impregnation in electrical industry, kerosene vapor phase drying, powder metallurgy sintering, freeze drying in food industry, etc. It is also suitable for the workplace with large amount of steam and fine dust.

Vacuum Pumps For Wear-Resistant Coating

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

How to check the oil seal leakage of vacuum pump

No matter whether the water ring vacuum pump is pumping air or water, there should be no leakage. Check the oil seal carefully before use to see if it leaks. Oil seal is a kind of seal often installed in water ring vacuum pump equipment, which has good sealing effect. How to check whether the vacuum pump oil seal leaks? 

1. The water level indicator in the vacuum system is not broken or leaking.

2. Close the drain valve on the steam side of the condenser to prevent leakage.

3. Check whether the water ring vacuum pump is under negative pressure, whether the water level of the low pressure heater is normal and whether the drain valve is sealed.

4. Check whether the exhaust steam safety valve of low pressure cylinder is in good condition and there is no air intake.

5. Check whether the gravity return water of the speed control feed water pump leads to the condenser. If the return water volume is small and the water seal bag cannot be sealed, the gravity return water from the sealing water of the water supply ring vacuum pump should be poured into the groove.

6. Check the area connecting the vacuum exhaust pipe and the cylinder for air leakage. When the load drops, the air leakage will be reduced, while when the load rises, the vacuum will increase slightly.

7. If the water seal, pipe, flange or weld of vacuum system valve is not firm, especially the pipe and valve port from expansion tank or boiler start-up separator to condenser.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

The reason why single stage centrifugal pump can't pump water

Although the single-stage centrifugal pump has a certain degree of self-priming capacity, it is still necessary to ensure that the inlet pipe is completely sealed when it is installed. 

The reason why the centrifugal pump does not pump water may be that the user does not install it correctly. The correct installation and use of centrifugal pump suction pipe should be installed at the bottom of the pool bottom valve. Before starting, the whole pump body and inlet pipe must be filled with water. The outlet valve must be closed before starting, and then the outlet valve shall be opened slowly after opening the centrifugal pump. Each single-stage centrifugal pump has different self-priming performance according to different models. When choosing the model, you must know each single-stage centrifugal pump.

The reason why the single-stage centrifugal pump can not pump water may also be that the self-priming exceeds the effective self-priming height of the centrifugal pump. The self-priming head of conventional single-stage centrifugal pump is within 3M. If the height exceeds this height, self-priming centrifugal pump or high suction self-priming pump with vacuum auxiliary device must be used.

The reason why the single-stage centrifugal pump can not pump water may also be due to the blockage of debris in pump cavity, impeller, bottom valve, pipeline and other places. If the single-stage centrifugal pump is sealed and has leakage, it will also lead to the failure of pumping.


CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Axial force of screw vacuum pump

The axial force of the screw vacuum pump may be caused by the uneven pressure on the suction and discharge ports, resulting in uneven pressure on both sides of the impeller, which is not completely symmetrical and produces axial force. But how to solve the axial force? 

Although we need to clean up the axial force of the screw vacuum pump, if we clean it thoroughly, the rotor will rotate unsteadily. Therefore, it is necessary to compensate the amount of 30 by bearing in the design, so that the bearing at the non driving end of reciprocating vacuum pump is usually angular contact bearing, because this method can be used to withstand higher axial force.

The general solution is to symmetrically install the balance disk and impeller of the screw vacuum pump, and the single-stage pump generally has a balance hole on the impeller. Secondly, there is a way to install balance blades on the impeller to balance the axial force.

Screw vacuum pump will be affected by many factors in the process of operation. Any small problems may affect the normal operation. Therefore, regular inspection and maintenance are needed to avoid problems and reduce efficiency.

Water Ring Vacuum Pump Structure

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Volume and application of liquid ring vacuum pump cavity

In the process of using liquid ring vacuum pump, it is a self-priming pump, and its products are gradually adopted by mining, chemical industry, light industry, petroleum and other industries. In the process of industrial production, there are many technological processes, such as vacuum water diversion, vacuum evaporation, vacuum moisture regain and so on. 

Liquid ring vacuum pump can be widely used, mainly because of the rapid development of its application technology. In the process of using the equipment, the gas compression in the water ring pump is isothermal, so it can pump out its explosive and flammable gas, and it can also pump out the gas containing water and dust in the process of using.

When the pump is equipped with a proper amount of impeller, it can be thrown into the water directly in the process of working.

The lower part of the water ring of the liquid ring vacuum pump is just tangent to the impeller, and the inner surface of the upper part of the water ring is just in contact with the top of the blade. At this time, a crescent shaped space will be directly formed between the water ring and the impeller, which is also equivalent to several small cavities.

In the process of using liquid ring vacuum pump, it mainly depends on the change of pump cavity volume to effectively realize the function of exhaust and suction. The structure of the equipment is relatively simple, and its accuracy requirement is not high in the process of production, so it is very easy to process.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces 

Overall arrangement structure and installation of vacuum pump

Now the field of vacuum pump is becoming more and more extensive, so now there are more kinds of products. Now with the continuous development of vacuum technology and the requirements of scientific research field for its pressure are becoming wider and wider. Basically, the vacuum pumping system composed of several vacuum pumps can meet the production after common pumping. 

At present, the departments concerned are quite familiar with the working pressure range of the vacuum pump, so any type of vacuum pump will not be fully applicable to all working ranges, and different types of vacuum pumps can only be selected according to different working requirements and pressure ranges.

In order to be more convenient to use, vacuum pumps with different performance will be combined according to their different requirements in the process of vacuum technology. The use of products is an essential main pump in the application of vacuum technology in various industries of our national economy.

The overall layout structure of the vacuum pump will directly determine the overall structure of the pump. The vertical structure, the horizontal device of the air inlet and exhaust port and the connected pipeline are more convenient, but the center of gravity of the pump is relatively high when it is used, so its stability performance will be poor when it is running at high speed.

When the horizontal pump is installed, its exhaust port needs to be below, while the air inlet needs to be above. Sometimes, in the process of installation, for the convenience of system pipeline installation and connection, the exhaust port can be connected from the horizontal direction, and the direction of air inlet and exhaust is perpendicular to each other.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

micro vacuum pump exhaust condition

If the micro pump can not pump water to the equipment effectively, it will need to be used in the process of low water pumping. 

The advantage of the micro vacuum pump in the process of using is that the equipment directly vacuumizes when it does not contact with water. After the vacuum is formed in the equipment, it needs to rely on the air pressure to pump up the water pressure, and then it starts to pump water. In the process of using, it may directly vacuumize because there is no water in the pump. After the vacuum is formed, it depends on the air pressure to pump up the water pressure, and then it is turned on Start pumping.

Micro vacuum pump in the process of pumping resistance, and then according to its judgment conditions to narrow the scope of selection, but in the process of using, we need to consider the problem of the exhaust end of the equipment in time, so as to better select the scope of its choice.

In the actual application process of micro vacuum pump, the exhaust condition faced by the equipment is different. One is that the exhaust is relatively smooth and directly to the atmosphere. The other is that the exhaust resistance is relatively large, such as valves, large damping sensors and other parts on the exhaust pipeline.

In the process of design and manufacture of modern micro vacuum pump, different exhaust conditions need to be treated differently. The exhaust port of the equipment allows a large resistance value. Such a parameter is to calibrate the exhaust capacity of the pump. In this way, strict technical means can be used to determine its type selection.

Welded Bellows Industry Application

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Talk about vacuum pump

Water ring vacuum pump (water ring pump) is a kind of coarse vacuum pump. The limit pressure it can obtain is 2.66-9.31kpa for single-stage pump and 0.133-0.665kpa for double-stage pump. Water ring pump can also be used as compressor, it belongs to low pressure compressor, its pressure range is (1 ~ 2) x105pa gauge pressure (under specific conditions). Water ring pump is widely used in many processes of petroleum, chemical, machinery, mining, light industry, papermaking, power, metallurgy, medicine, food and other industries, municipal and agricultural sectors, such as vacuum filtration, vacuum feeding, vacuum degassing, vacuum evaporation, vacuum concentration and vacuum moisture regain, etc Flammable, explosive gas, in addition to dust, water gas can be pumped, therefore, the application of water ring pump is increasing. 

Water ring pump is composed of impeller, pump body, suction and exhaust disc, water ring formed by water in the inner wall of pump body, suction port, exhaust port, auxiliary exhaust valve, etc.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces 

How to use screw vacuum pump

Screw vacuum pump will be affected by air leakage in the process of use. Many users think that this is a quality problem of the equipment, which has been replaced by new equipment. However, the cause of air leakage is not only the quality problem, but also the front and rear covers are different? In other words, the front and rear covers of the screw vacuum pump have different axial degrees, and the result is the same as the bearing deflection. 

With the increase of the liquid ring temperature, the saturated vapor pressure also increases, which reduces the vacuum degree of the screw vacuum pump, but has no effect on the exhaust pressure? Tighten the connecting bolts and stuffing box of the screw vacuum pump, tighten the connection between the pipeline, instrument and other parts, or replace the gasket and stuffing.

For the leakage of the screw vacuum pump, putty can also be used as a temporary remedy to make the bearing deflect, so that the impeller inclines and is installed in the pump body of the screw vacuum pump. The axial clearance of single acting pump is uneven. When the impeller rotates, the side cover must have certain friction, and the side cover and the impeller end face will be scratched.

When the gas in the compression chamber passes through the increased gap, the axial gap increases, and a large amount of gas leaks into the suction chamber, thus reducing the vacuum pressure or discharge pressure of the screw vacuum pump. At this time, the bearing of screw vacuum pump must be removed for maintenance, and then installed correctly. Screw vacuum pump is a kind of pump device, which completes the suction and exhaust work produced by synchronous high-speed reverse rotation in the pump shell.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump