Component structure of oil free vacuum system

In recent years, it has been found that the performance and technical index of many electronic devices are seriously affected by the return of oil vapor from mechanical vacuum pump and diffusion pump into the evacuated vessel or device. For example, the oxide cathode of electronic tube reduces its emission performance and service life due to oil vapor; various high-power and high-voltage electronic tubes are easy to be broken through due to the presence of oil vapor; the high-voltage vacuum capacitors used in radio stations, due to the presence of poised steam, significantly reduce their withstand voltage index, and oil vapor has a significant adverse effect in many places. Therefore, the vacuum system used in these aspects should be replaced by an oil-free vacuum system, that is, instead of using vacuum oil sealing and vacuum oil as the working fluid (such as mechanical pump and diffusion pump), the vacuum system can be obtained by adsorption of gas molecules and reducing the pressure in the container. 

The adsorption pump uses the porous surface of some solid materials to strongly adsorb the gas in the cold state, so that the closed system can obtain a low vacuum of 10-2 mm mercury column. It is used as the front stage of oil-free system.

In addition to activated carbon, most of the adsorbents used in the adsorption pump use molecular sieve (artificial zeolite) to adsorb gas and obtain vacuum. Because, after cooling with liquid nitrogen, each kilogram of molecular sieve can pump a 50-100 liter container from the atmosphere into a vacuum of 10-2 mm mercury column. Therefore, it is a pump with large suction. After baking at about 400 ℃, the gas it absorbs will be released again (called activation or regeneration) to restore the ability of reabsorbing. At present, the commonly used 5A molecular sieves (with large absorption capacity, suitable for exhaust air, but often "activated", with an average pore diameter of about 5 angstroms) and 13X molecular sieves (although their adsorption capacity is smaller than 5A molecular sieves, they can absorb oil vapor molecules).

Rotary Vane Vacuum Pump In Viscose Fiber Production

Pump Shaft Damage Causes

Vacuum System In Straight Pull Single Crystal Furnace

Heating problem of screw vacuum pump

With the development of industry now, we should be very familiar with the screw vacuum pump, because its characteristics are widely used, in order to understand it better, let's understand the heating problem of screw vacuum pump together. 

Now the screw vacuum pump has excellent corrosion resistance. When using the screw vacuum pump, we will encounter the situation that the inner wall temperature of the reducer is very high two hours after starting. This situation is very unusual for machinery and equipment. Therefore, we should solve it immediately. If the temperature does not drop, please note that the oil window on the screw vacuum pump cannot be used with the plexiglass plate. Lift the low temperature cooler to the vacuum pumping position of screw vacuum pump, and apply cooling water of minus 10 degrees to reduce the temperature.

Screw vacuum pump manufacturers remind to reduce the temperature of working fluid in front of screw vacuum pump, measures should be taken to reduce the temperature, less than 20 degrees, in order to achieve better results.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Roots water ring vacuum unit as vacuum precooler

Roots water ring vacuum unit is composed of Roots vacuum pump and water ring vacuum pump. The vacuum degree that a single water ring pump can reach is 3300pa. If you want to reach higher vacuum degree requirements, it is necessary to equip roots pump so that it can pump at a higher speed. Roots water ring vacuum unit as a vacuum precooler in the use of time demand of vacuum degree and pumping speed requirements are relatively high, so in the selection of time must be based on the actual situation of the ratio. 

In a cubic reactor, 1 / 3 of cooked meat is required to be placed in the reactor, and the temperature of cooked meat is about 90 ℃. The temperature of cooked meat should be reduced to about 20 ℃ by vacuumizing. The required time is less than or equal to 30 minutes. The transpiration of steam is 20kg every 30 minutes under the condition of vacuum negative pressure.

In the selection of such vacuum units, the need to pay attention to the amount of gas in the reaction, the vacuum requirements for cooling and other factors, so as to correctly select roots water ring vacuum unit and then reach the intention of vacuum precooling.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

stainless steel vacuum pump braking mode

Do you know? There are various braking modes of stainless steel vacuum pump, each of which has its own advantages and characteristics. When we use the vacuum pump, we need to adopt different braking methods in different situations. 

1. Regenerative braking: refers to the stainless steel vacuum pump when decelerating or stopping, the energy generated by braking is fed back to the DC bus through the inverter circuit. After being absorbed by the resistance capacitance circuit, the regenerative braking can only work when the server is working normally. In case of fault, emergency stop and power failure, the motor cannot be braked, and the work is carried out automatically by the system.

2. Electromagnetic braking: the shaft of stainless steel vacuum pump is locked by mechanical device. The electromagnetic braking is generally started after SV and off, otherwise the amplifier may be overloaded. The dynamic brake is generally started after SV, off or power failure of the main circuit, otherwise the dynamic braking resistance may overheat.

3. Dynamic brake: it is composed of dynamic brake resistor, which can shorten the mechanical feed distance of stainless steel vacuum pump through energy consumption braking in case of fault, emergency stop and power failure. The dynamic brake does not need power supply and needs external relay control.

There are three braking modes of stainless steel vacuum pump: regenerative braking, electromagnetic braking and dynamic brake. Which one should be used in the actual operation process should be selected according to the actual situation.

Vertical Screw Dry Vacuum Pump Structural Principle

Air Root Blower Price

Vertical Screw Dry Vacuum Pump In Solvent Recovery Of Pharmaceutical Industry

screw vacuum pump analysis and advantage introduction

screw vacuum pump analysis and advantage introduction

The use and advantages of the screw vacuum pump are described. First, the use of the screw vacuum pump is described. The two screws of the screw vacuum pump are calibrated by precise dynamic balancing, supported by bearings. The device is in the pump shell, and there is a certain gap between the screw and the screw. Therefore, when the pump is working, there is no friction between them, the operation is stable, the noise is very low, and the working cavity does not need smooth oil, The dry screw vacuum pump can pump out the gas place which contains a lot of water vapor and a small amount of dust. It has the advantages of higher limit vacuum, lower power consumption, energy saving and maintenance free. It is an updated product of oil sealed vacuum pump.

Then analyze the advantages of screw vacuum pump. At present, the development of various vacuum pumps is more and more affected by vacuum applications. The general vacuum system cannot meet the requirements of clean, oil-free and corrosion-resistant. Therefore, in recent years, the market demand of dry vacuum pump is large, and the vacuum products have been updated, A large number of oil vacuum systems have been replaced by oil-free clean vacuum systems. Almost every large foreign vacuum company produces various types of dry vacuum pumps. Screw vacuum pump is a non-contact dry pump, which is an ideal pump in the early 1990s. It is widely used for its wide pumping speed range, simple and compact structure, no friction, long life, low energy consumption, no oil pollution and other advantages.

Due to its superior performance, dry screw vacuum pump has become the first choice of vacuum obtaining equipment in microelectronics, semiconductor, pharmaceutical, precision processing and other industries in Europe, America and Japan. Based on screw compressor, Japan has long developed the multi rotor profile of vacuum pump and put it into the market. Several vacuum equipment companies in Germany have gradually developed equal pitch and variable pitch rotor profiles, and have done a lot of research on rotor and body cooling. In 2008, Chinese enterprises also put the production of screw vacuum pump into mass production, which has been well applied in chemical and pharmaceutical industries.

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Dry Type Vacuum Pump

Common vacuum units in vacuum furnace plant

Vacuum equipment professional factory provides complete vacuum equipment for vacuum electric furnace and other equipment. In addition to providing a complete set of vacuum acquisition equipment, some of them also have measurement and control vacuum instruments, which can be directly connected to the furnace body.

There are many kinds of vacuum units in China, all of which are JK series. Now, they are produced by Beijing Instrument Factory and Lanzhou vacuum equipment factory

In addition to the above-mentioned units, there are also oil booster pump and roots pump unit which are widely used in vacuum heat treatment furnace.

Roots Vacuum Pump In Sterilization Equipment

Water Ring Pump

Water Ring Vacuum Pump

Selection of screw vacuum pump

Selection of screw vacuum pump

When the screw vacuum pump is used to pump sludge and other media containing solid particles, the pressure of the screw pump is relatively large, generally reaching 0.6mpa-1.2mpa.

The screw vacuum pump is a kind of positive displacement pump with internal engagement and eccentric rotation. The main components of the pump are: a single screw rotor and a stator with double screw, which is usually made of elastic materials. When the rotor rotates around the axis of the stator in the cavity, the closed wrist formed between the rotating stators will move along the rotor's spiral line. Therefore, the medium will be continuously and uniformly And the volume is constant from the suction to the discharge. Based on this feature, the screw pump is particularly suitable for the following working conditions.

High viscosity medium delivered by screw pump: medium with viscosity of 37000-200000 MPA can be delivered according to different pump sizes.

Medium containing particles or fibers: the particle diameter can be 30mm (not more than the eccentricity of rotor). The fiber length can be 350mm (equivalent to the pitch of 0.4-position rotor). Its content is generally up to 40% of the medium cellar. If the solid in the medium is fine powder, the highest content can reach 60% or higher. When it is required that the conveying pressure is stable and the inherent structure of the medium is not damaged, the screw pump is the best choice for conveying.

Screw vacuum pump is widely used in wastewater treatment plant to transport water, wet sludge and flocculant liquid because of its variable transportation, strong self-priming ability, reversibility and ability to transport liquid containing solid particles. The selection of screw pump should follow the principle of economy, rationality and reliability. If the design and selection are not considered carefully, it will bring trouble to the later use, management and maintenance. Therefore, choosing a reasonable and reliable screw pump according to the actual production needs can not only ensure the smooth production, but also reduce the repair cost.

How To Prevent Vacuum Pump Corrosion

Dry Scroll Vacuum Pump

Dry Screw Vacuum Pump

Vacuum coating technology of vacuum pump

Vacuum coating technology of vacuum pump

What do you know about the knowledge of 2BV vacuum pump? You often use it. You should know about its vacuum coating technology. Here is the introduction of the vacuum coating technology of 2BV vacuum pump:

Vacuum coating technology is an important branch of 2BV vacuum pump application technology. It has been widely used in optics, electronics, energy development, physical and chemical instruments, construction machinery, packaging, civil products, appearance science and scientific research. The main methods of vacuum coating are evaporation, sputtering, ion plating, beam stacking and molecular beam epitaxy. In addition, there is chemical vapor deposition.

If the purpose of vacuum coating is to change the physical and chemical properties of the material surface, this technology is an important part of the vacuum surface treatment technology. Now I will give a brief introduction to its main application. First of all, in terms of optics, a piece of optical glass or quartz coated with one or several layers of films of different substances can become a high reflection or no reflection (i.e. antireflection film) or any expected proportion of reflection or transmission data, and can also be used as a filter for absorption of a certain wavelength and transmission of another wavelength.

High reflective films are needed from large-diameter astronomical telescopes and various lasers to large window coated Jasmine in new buildings. Antireflective film is widely used in photography, laser start, and new building window coated glass, which are in great demand. Antireflection film is widely used in camera and television camera lens. Vacuum coating plays an important role in electronics. Various range of inheritance circuits. Including memory, arithmetic unit, notification logic element, etc. all need to use conductive film, insulating film and maintenance film. As the mask of the circuit, chromium film is used.

ZJ Roots Vacuum Pump

ZJP Roots Vacuum Pump

air-cooled roots-liquid ring vacuum system

Dry Screw Vacuum Pump Selection

Dry Screw Vacuum Pump Selection

Dry screw vacuum pump is a kind of mechanical equipment used for conveying or pressurizing fluid. There are many kinds of dry screw vacuum pump, such as centrifugal pump, pipeline pump, sewage pump, screw pump and so on. Today we are going to talk about the relevant knowledge of screw pump.

Dry screw vacuum pump has the characteristics of variable transmission, strong self-priming ability and reversibility. It is used to transport water, wet sludge and flocculant liquid in sewage treatment plant. When choosing screw pump, we should abide by the principles of economy, rationality and reliability. If the selection of screw pump is not thoughtful, it will cause a lot of trouble in the future use, management and maintenance. Therefore, when choosing dry screw vacuum pump, we should choose not only to ensure the smooth operation of production, but also to reduce the cost of repair.

Liquid Ring Vacuum compressor

Water ring vacuum pump

2BE1 Series Liquid Ring Vacuum Pump

VACUUM FURNACE

Reciprocating Pump in Chemical Plant

Vacuum pump is a machine used to pump air from equipment or production system to make equipment or production system work in vacuum. The main working performance parameters of vacuum pump are: pumping rate, limit vacuum degree, shaft power and rotational speed. The pumping rate of vacuum pump refers to the volume of gas that can be pumped out per unit time (m 3/h). Limit vacuum is the highest vacuum that a pump can achieve.

Vacuum pumps commonly used in chemical production include reciprocating vacuum pumps, water ring vacuum pumps and jet pumps. The structure of reciprocating vacuum pump is basically the same as that of piston compressor.

Vacuum pump is characterized by high pressure ratio. For example, to achieve 95% vacuum, the absolute pressure of nominal inspiration is 0.005 MPa, while the exhaust pressure is 0.1 Mpa, with a pressure ratio of 20. Because of the high pressure ratio, the volume occupied by the residual gap volume after expansion is very large, which greatly reduces the suction capacity and the effective utilization rate of the cylinder is very low.

In order to solve the above problems, several grooves are usually opened on the cylinder wall at both ends of the cylinder, which are thicker than the piston. When the piston runs to the stop point, the grooves are used to balance the pressure of the cylinders on both sides of the piston. For example, when the piston runs to the left stop point, the exhaust of the left cylinder ends, the residual pressure in the clearance volume is higher, the suction in the right cylinder ends, and the pressure is lower. Because of the connection of grooves, the gas pressure in the clearance volume of the left cylinder decreases accordingly. In this way, the volume occupied by the expansion of residual gas is greatly reduced and the suction capacity is increased during the piston return operation. The piston runs to the right stop.

Reciprocating vacuum pump is suitable for pumping non-solid particles, non-corrosive gas. This kind of vacuum pump is widely used in chemical industry because of its high pumping rate and high vacuum degree.

Open Cycle Water Ring Vacuum System

Closed Cycle Water Ring Vacuum System

Roots Vacuum Pump Pressure Testing

The temperature rise of Roots vacuum pump refers to the difference between the highest temperature and room temperature measured in all parts of the pump exterior under the condition of stable operation of the limit vacuum or rated vacuum. The types of thermometers used to measure temperature rise are not limited, but they should have the measurement accuracy of <1 C. When marking the temperature rise, it should also indicate the room temperature at that time, the cooling conditions of the pump, including the cooling method, such as the water cooling system should indicate the temperature of the water in and out.

The outlet pressure of Roots vacuum pump refers to the pressure of measuring the jacket near the exhaust port corresponding to a certain inlet pressure value under the condition of stable operation of Roots vacuum pump. The test of outlet pressure can be carried out at the same time as the measurement of the pumping rate, starting from the appropriate value close to the limit vacuum until about the allowable inlet pressure of the pump. Measure the outlet pressure for each inlet pressure value.

The measuring position of the outlet pressure is specified in the standards issued by the Ministry. The distance between the pressure measuring tube and the flange of the pump outlet should not be greater than the diameter of the pump outlet, and the opening plane of the pressure measuring tube should be parallel to the direction of the airflow. The insertion depth is 1/4 d, but not greater than 50 mm.
Roots Vacuum Pump

Dry Type Vacuum Pump

Water ring vacuum pumps are sometimes used in coal industry

With the increasing emphasis on coal mine safety, higher requirements and standards will be put forward for water ring vacuum pumps used in coal mines. Efficient, fast and thorough is the main development direction of mine water ring vacuum pump. Next, we will learn about the application of water ring vacuum pump in coal industry, hoping to help you.

1. Coal refining

In the process of vacuum filtration of refined coal, it is generally required to withstand the impact of air flow and water. A water ring vacuum pump with a pre-separator is required to separate liquid under a steady pressure.

2. Dust removal

Coal mine dust is the main source of surface pollution due to its large amount and complex composition. With large water ring vacuum pump as the main pump, equipped with separation, dust removal, protection and other devices to achieve the recovery and utilization of dust in mining areas, also plays a role in purifying air.

3. Production of Antistatic Equipment

In the process of producing anti-static and flame-retardant conveyor belts and underground clothing, vacuum slurry immersion process is adopted to make anti-static and flame-retardant enter the conveyor belt, replacing the original spraying process, which is more safe and reliable.

4. Vacuum Pump Drying Cable

The insulation performance of mine cables can be easily reduced in damp mines for a long time. Using water ring vacuum pump as pumping equipment, the cables are heated by low voltage and high current, which can effectively prevent oxidation and prolong the aging process of cables under the condition of low oxygen concentration.

China-2X-Series-Rotary-Vacuum-Pump

2XZ-Series-Two-stage-Rotary-Vacuum-Pump

XD-series-single-stage-rotary-vane-vacuum-pump

Reasons for Heating of Water Ring Vacuum Pump

1. The amount of circulating water is too little. There are two uses of circulating water. One is to cool the vacuum pump. The other is that water forms a water ring in the pump chamber when the impeller rotates. The air compresses the air in the water ring when the impeller rotates. 2. The temperature of the gas sucked by the vacuum pump is higher and the vacuum degree of circulating water is lower than 30 degrees. After running continuously for one day, the vacuum pump produces scale in the pump just like the kettle that boils water at home. When the impeller runs difficultly, the increase of friction causes the heat of the vacuum pump.

Exclusion methods:

1. The motor passport is dismantled. Whether the fan wings of the motor are flexible or not, there is no scale. When it is hard to operate, the exhaust pipe of the pump is dismantled and the scale inside is checked with the hand lamp. Scale will make the impeller difficult to operate, burn down the motor, and the spring of the mechanical seal will be easily locked on the shaft because of the scale. After the end surface is worn out, it can not be supplied automatically, resulting in leakage of the mechanical seal. Water burns down the motor.

2. Vacuum pump is a pumping pump, which permits a small amount of liquid. If the material sucked contains a large amount of water, buffer tank should be installed in front of the vacuum pump. If the vacuum pump sucks a large amount of water, it will break the impeller.

3. Vacuum pump sucks high gas temperature, using tap water as circulating water or using condenser to cool the gas. Attention: Vacuum pump must install overload protector to prevent overload burning motor. Connecting pipeline can not be thinned by 70%. Excessive thin pipeline and poor drainage can also cause overcurrent of motor.

ZJ-Series-Roots-Vacuum-Pumps

Diffusion-Pump-Vacuum-Unit

Water-Ring-Vacuum-Negative-Pressure-Station

2SK-Series-Two-stage-Water-Ring-Vacuum-Pump

Roots Vacuum Unit of daily Inspection

The full plastic horizontal water jet vacuum unit is used as the front pump, which can pump corrosive gases, no oil pump, on-off and off exhaust valves, complete isolation of crankcase and cylinder, and self-lubricating material is used for piston rings. On the basis of many years of scientific research and production experience, the high-efficiency and energy-saving products developed by HaoKaide Vacuum Technology are usually based on the advanced technology of similar products in the world. It is used to extract solid particles. It is advanced in design and novel in structure. It is suitable for various harsh and complex applications. It can suck the medium containing a large amount of water vapor and condensable vapor. It is not easy to occur danger when sucking inflammable, explosive or toxic, corrosive gases. Therefore, it can be widely used in machinery and fixed parts, which are covered by import and export pumps, thus realizing advanced oil-free lubrication. Clean ultra-high vacuum acquisition equipment consisting of front pipeline, water cut-off protector, molecular pump power supply, control power supply, etc. Easy installation, simple operation, easy connection and reliable performance. Its action is linked with the motor of the front-stage pump. When the sliding valve pump stops, it can automatically overload protection. The whole unit is installed on a rack, equipped with pipes, valves, electrical operation control box and cooling water pipe system. The unit is compact in structure and easy to use. This series of units in order to prevent oil reversal when the sliding valve pump shuts down.Diffusion-Pump-for-vacuum-process-systems

It is very important for the daily maintenance of Roots vacuum pump to make it use for a long time, and there will be no major malfunction in the application process. After a long period of use, there will be some minor problems in the equipment itself, pipeline and other auxiliary facilities. Although this is not a big malfunction, there is also one for the equipment. Only by solving these minor problems, which are not paid much attention to, can the application time of the equipment be prolonged and the application performance of various aspects be increased.

To do a good job in the daily maintenance of Roots vacuum pump, it is necessary to strengthen the accumulation of knowledge and carry out a detailed inspection of the different structures of the equipment, mainly including temperature measurement, whether the oil quantity is too much or too little, the load of the motor, whether the parts are loosened in long-term operation, and the wear and tear of the components, etc. It is a good job to do these works for the performance of the equipment. Guarantee, and through testing can effectively play the actual performance of equipment.Two-Stage-rotary-vane-Vacuum-Pump-for-refrigerating-system

Although this is only a small job, it is very important for Roots vacuum pump. Only by increasing the expansion of its application performance, can the equipment be improved. It is necessary to consider all aspects of application. Therefore, daily maintenance is one of the best ways to use the vacuum unit equipment.Liquid-ring-vacuum-pump-for-gold-or-coal-industry

Air-cooled Roots Vacuum Pump Construction

Because the series of pumps are processed by NC machining center, O-ring seals are used between the pump body, the two side caps and the two end caps. The cylindrical pins are positioned, and the parts are interchangeable and easy to maintain. Roots pump can not be used alone, only series front pump can be used.

Different vacuum pumps can be selected as the front pump, such as screw pump, oil seal pump, liquid ring pump, etc. It is worth mentioning that when screw pump and liquid ring pump are used as the first stage pump, they are especially suitable for the occasion where a large number of suspicious gases need to be removed.hot-sale-double-stage-rotary-vane-vacuum-pump

The company's patented technology is used in the dynamic seal part, and the imported oil seal is used to control the jump of the shaft seal less than 0.02mm, so there is no oil leakage at the shaft seal part. A self-weight valve is installed between the intake and exhaust ports of the pump. Its function is to open the valve automatically when the pressure difference between the exhaust ports and the intake ports exceeds the self-weight of the valve. This pressure difference is the pressure difference that the pump can operate reliably. Therefore, Roots pump with relief valve has the function of automatic overload prevention.Energy-saving-rotary-vane-vacuum-pump

Roots Vacuum Pump in Paper Industry

The main advantages of using this vacuum pump device and the selection of relevant equipment are as follows:

(1) To reduce power consumption, in general, Roots pump consumes only 40-50% of the power consumed by other equipment. This saving effect can be achieved because of the use of Roots vacuum pump with air-water separation device and the use of self-priming centrifugal pump.

Contrast example: For a container with capacity of 52 m3/min, vacuum degree needs to be pumped to 4x104Pa (absolute pressure is 6x104Pa). Power comparison on the pump shaft: liquid ring pump is 95 horsepower, tolerance of capacity and power is <10%. For single-stage Roots pump, 55 horsepower, capacity and power tolerance is (+5%).

(2) The capacity of the flexible pump can be adjusted to the required value by the adjusting device, and there is a minimum specific power value. Roots vacuum pump belongs to the variable capacity type. It can stipulate a 25% reserve belt. If the required conveying capacity is not considered carefully (more or less) in manufacturing, the correct treatment is to change the diameter of the pulley and the speed, and the ideal operation effect can be obtained.

Roots pump belongs to variable displacement pump, so: 1) capacity is proportional to speed, 2) power is proportional to speed and pressure.

In all cases, Roots Vacuum Pump can reduce the speed by 50%, and also can ensure the above advantages.

(3) Improving the vacuum degree of working quality can be obtained by a certain method, but it has nothing to do with the amount of water pumped by the pump. During the production of parchment paper, a liquid ring pump was installed on the vacuum roller and attention was paid to the variations of vacuum degree. Its absolute pressure was 40-45 mmHg. A separator and a Roots pump are installed on the vacuum volt roll. With the same recording instrument, the absolute pressure is measured to be 5 mmHg.rotary-vacuum-pump-in-shipbuilding

(4) Once the self-protection paper machine is in operation, it should not stop working. In practice, a self-protection system is adopted, that is, two pumps with identical specifications are used to form a two-stage pump group, and only one motor is used to drive it. In case one machine stops working, the other can work continuously. But the pipeline should be laid well. At this point, the linear velocity and vacuum may temporarily decrease slightly.

(5) Four common basic methods are as follows: (1) vacuum pump with separator; (2) separation device is placed in the network and wool part; (3) in order to ensure the vacuum degree of each paper machine, a central vacuum unit can be set up; (4) separation device can solve the problems of high vacuum degree and low vacuum degree.

(6) Vacuum unit can be installed in any suitable position. Since Roots vacuum pump only sucks air, it can be placed randomly within 100m from the vacuum point. The only thing to be noticed is that the pressure difference (which is very small) is generated when air passes through the pipeline. It is preferable to avoid the low pressure zone in the tube.

Separate gas and water separators (columnar landing separators, separator boxes, etc.) are installed as closed systems with vacuum points.

(7) Water immersion pump is harmless Roots vacuum pump can withstand accidental water immersion. It can pump water out.

(8) The reduction of maintenance workload is due to: (1) gas-water separation avoids machine damage due to corrosion and wear; and (2) Roots pump structure determines (due to non-contact between parts).Roots_Vacuum_Pump

(9) Little or no water is consumed. Roots pumps reduce water consumption. A liquid ring pump with a general capacity of 52 m3/min requires at least 10,000 L/h of pure calcium-free cold water to obtain a vacuum of 300 mmHg, while a Roots vacuum pump can operate without water or a small amount of water.