2BV water ring vacuum pump type determination

To determine the model of 2BV water ring vacuum pump, we should first determine which series of pump to choose according to the process parameters of the device, the physical and chemical properties of the conveying medium and other parameters, combined with the structural characteristics and applicable station of our company's products; then determine the rated flow of 2BV water ring vacuum pump; thirdly, we should also determine its rated head; and then determine the 2BV water ring vacuum pump Rated motor. 

When determining the model of 2BV water ring vacuum pump, you should also check the type spectrum of the selected series of pumps, the corresponding flow and head in which model box. At this time, you can preliminarily determine the selected model. Usually, under different speeds, you may choose one model. For checking the performance curve of the initially selected model, check whether the NPSHr of the pump is consistent Meet the npsha requirements of the unit.

When selecting 2BV water ring vacuum pump, pay attention to check the performance curve and check whether the rated working point of the selected model falls in the high efficiency working area of the pump. The final model of 2BV water ring vacuum pump is determined by comprehensively comparing the efficiency, speed (the lower the speed, the longer the service life) and price of the pump.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Repair of corrosion and wear of water ring vacuum pump cavity

The water ring vacuum pump is evenly distributed on all surfaces of the equipment, while the latter only occurs locally. Such as pitting corrosion, crevice corrosion, intergranular corrosion, stress corrosion cracking, corrosion fatigue, hydrogen corrosion cracking, wear corrosion, delamination corrosion, etc. 

It is one of the effective anti-corrosion measures to use polymer composite repair material to carry out the surface organic coating anti-corrosion. Surface adhesion protection can be widely used in repairing and pre protecting the parts of abrasion, cavitation and corrosion. It has good chemical resistance, excellent mechanical properties and adhesive properties. Compared with the traditional pressure vessel welding repair, it has the characteristics of simple construction, low cost, safety performance and good repair effect.

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Difference between roots vacuum pump and roots blower

The operating principle of Roots vacuum pump and roots blower are the same, both belong to positive displacement blower, and the structure of the whole machine is basically the same, but there are still some differences in some accessories. Roots blower belongs to blower blowing system and belongs to positive pressure fan class, while roots vacuum pump belongs to negative pressure suction system and belongs to negative pressure fan class. What else exists between them What about the difference? Let's have a look at it.

What is the difference between roots vacuum pump and roots blower? Because roots vacuum pump is suction, it needs to customer service atmospheric pressure, so it is more difficult to overcome negative pressure, and positive pressure blower can rely on atmospheric pressure, positive pressure rise can be stronger, pressure scale is more extensive.

Since the production of Roots vacuum pump is more difficult, the price of general roots vacuum pump will be higher than that of Roots blower. We can look at the quotation of the same type. The price of vacuum pump is often higher. After roots blower is installed, it can be used. However, roots vacuum pump may need to be equipped with front stage pump when starting.

The purpose of the front stage pump is to ensure that the roots vacuum pump will not rise to a very high negative pressure. Therefore, the front stage pump is required to increase the negative pressure first, and then open the roots vacuum pump to continuously increase the pressure. In terms of operation principle, roots blower can sweep clean and pollution-free gas without daily smoothness. And its speed is fast, each part of the open space is small, less emission.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Quality of Roots vacuum pump

The practical production of Roots vacuum pump is carried out through various processes. In order to strengthen the quality of the blank, the deep processing should be carried out strictly. The management system should be done in time to help the production of waste products. Under the condition of not affecting the order production, the waste parts should be treated well, and the man hour quota should be controlled well On the basis of the bottom operation, we should timely corresponding to the needs of the market, and strengthen the optimization of the processing technology of the products. 

The use of Roots vacuum pump strength has become an important condition to promote the development of enterprise productivity. Its use in different occupations has different application ability, but the same point is that it can not be used as a single pump, it can only be assembled with other equipment into unit products for use, playing a driving strength foundation. Through the use function of the equipment itself, it can be useful For the use of other equipment to achieve a higher functional strength, improve the driving effect of product application.

Under the premise of accelerating the development of Roots vacuum pump's useful effect, it is necessary to make continuous performance of product application and function, further enhance the improvement of its product superiority, let the application of its products drive the development of enterprise's productivity, promote the continuous improvement of its application function in all aspects, fully accelerate the driving of its product application ability, and make it continuously perform on the basis of rational use Show the outstanding performance of the product application effect, and then show the usable function of the equipment.

In order to improve the quality of Roots vacuum pump, it is necessary to combine the status of product application, improve the development of all application strength, and constantly complete the overall driving of product application ability, so that it can enhance the continuous improvement of its quality advantage under the advantage effect of reasonable use, and make it show internal use advantage in the development process.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

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reciprocating vacuum pump of parts

In terms of structure, the cylinder of the compressor is extremely diverse. According to the pressure, gas transmission, type, scheme and use of the tightening machine, cooling method, data for making cylinder, possibility of production and traditional habits of the manufacturer, cylinders can be made in various ways. 

The heating of the cylinder is uneven: the temperature of the pressing out side is higher than that of the suction side. For large diameter cylinder, the sliding support at the pressing out side should be provided with water cooling to avoid skew.

For low and medium pressure below 50 gauge pressure and small-scale cylinder below 80 gauge pressure, cast iron can be used; for pressure below 150 gauge pressure, cast steel is used; for higher pressure, carbon steel is used. For 500 gauge pressure and higher, the cylinder system is forged with alloy steel.

The cast iron cylinder with compact volume, water jacket and channel connecting the valve with the intake and the outlet is a disordered double or three-layer casting.

In order to reduce the loss of aerodynamic force, the passage in the cylinder should be streamlined to reduce the loss of aerodynamic force. Because of the pulsating nature of the air flow in the piston compressor, the loss of this element can reach a large value.

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Vacuum unit pumping gas containing particles

Vacuum unit is used to pump air and other non condensable and non corrosive gases. It is widely used in various vacuum systems which need high pumping speed and low and high vacuum. It is also the first choice for coarse and medium vacuum systems. For example: vacuum smelting, liquid steel degassing, vacuum sintering, dynamic vacuum acquisition in large-scale space simulation experiment, vacuum impregnation treatment of power capacitor and transformer, exhaust of automatic production line of fluorescent tube and bulb, continuous exhaust of heat preservation bottle, pre extraction of vacuum coating equipment, extraction of magnesium reduction process, degassing of monocrystalline silicon refining process, etc. 

If the pumped gas contains solid particles, part of the particles will be discharged from the pump with the gas, and the other part of the particles will continue to rub in the gap in the pump, causing the gap to increase, resulting in the increase of leakage and the decrease of vacuum and gas volume. Therefore, roots vacuum unit is not suitable for pumping gas containing a large number of solid particles, especially solid particles with larger particle size and higher hardness.

The solution to the problem that the gas containing particles must be pumped: if unavoidable, the gas can be purified before entering roots vacuum unit (such as setting filter screen or adding vacuum buffer tank, etc.). If purification is difficult, the particles in the unit should be washed clean after pumping.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Mistakes in use of roots pump

Roots vacuum pump must be equipped with the front stage pump, roots pump can not be used alone. Roots pump is mostly used in Roots vacuum unit, its function is to improve pumping speed and vacuum degree of the front stage pump. Roots pump should be equipped with bypass valve in the connection with the front stage pump, which can effectively protect roots pump. If the air extraction of front stage pump is unstable or other factors lead to abnormal operation of the whole unit, roots pump with bypass valve will protect roots pump and prolong the life of the whole vacuum unit. 

When choosing roots pump, it is necessary to pay attention to which sealing method of wearing parts of roots pump is. Roots pump adopts mechanical seal, which can effectively improve the working efficiency of roots pump. If the sealing mode of roots pump is shaft sleeve seal, the working efficiency will be greatly reduced. Special attention should be paid to the selection of roots pump.

If the vacuum degree of roots pump is reduced in the process of use, it is necessary to check whether the clearance between roots pump rotors changes. If the rotor clearance of roots pump becomes larger, it is necessary to replace roots pump, because such roots pump does not make static and dynamic balance for Roots pump rotor in the process of production and processing, or it is sealed by shaft sleeve.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Vacuum measurement-vacuum gauge

In vacuum technology, the pressure of isotropic neutral gas is used to express the degree of vacuum. The tool used to measure gas pressure much lower than atmospheric pressure is usually called vacuum gauge or vacuum gauge. Most of the measured gases in the designated space are mixed gases. therefore. Vacuum measurement in the general sense should belong to the full pressure measurement of mixed gas. The vacuum gauge used is also a vacuum gauge that measures the full pressure. 

Vacuum measurement technology also includes gas composition analysis and partial pressure measurement. The former is to specify which kinds of gas components are contained in the residual gas and roughly estimate their respective proportions. The latter refers to the quantitative determination of the partial pressure values ​​of various gas components under conditions that can meet certain accuracy requirements. The instruments used are basically different types of mass spectrometers. They are called residual gas analyzer and partial pressure gauge.

The vacuum gauge currently used. One is to directly calculate the pressure value of the gas from the physical quantity of pressure measured by itself. This is the absolute vacuum gauge. The other is to indirectly reflect the measured gas pressure value through the physical quantity related to the gas pressure. This is the relative vacuum gauge. Because the relative vacuum gauge must pass the calibration of the absolute vacuum gauge to accurately measure the vacuum degree. Therefore, in addition to the measurement of the total pressure and partial pressure of the gas, the vacuum measurement technology should be included. The calibration of the real meter must also be included.

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Maintenance of Roots vacuum pump in application

The roots vacuum pump is a variable capacity vacuum pump with simple structure, large reserve capacity and easy maintenance. Daily maintenance work is simply to the bearings and gears to oil lubrication, maintenance costs are low.

Because the rotor profile of Roots vacuum pump is conjugate curve, its geometric symmetry is good. When the speed is not high, the working vibration frequency is lower than 80Hz, so the operation is stable and the noise is low. After replacing three roots pumps, the noise of 1575 paper machine was reduced, and the environmental noise pollution of the workshop basically reached the national environmental protection standard.

The paper sheet with certain humidity is formed by natural dehydration and forced dehydration of the web. Under the premise of small transverse shrinkage deformation, the pulp is normally and smoothly transferred to the press to further dehydrate the web by mechanical means.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Assembly clearance of vacuum pump

The fitting tolerance between parts is a very important parameter, which directly affects the performance of vacuum pump. The accuracy of the parts has been analyzed before and the rough bottom will appear if the fitting is not good. For example, there is a 2X-4 rotary vane vacuum pump. The user always thinks that the vacuum degree is not high. It is found that it runs normally without air leakage or oil leakage, the noise is not obvious, and the temperature rise is not serious, but the vacuum degree is only 20 grids (about 8 * 10-2 Torr). The experience of the vacuum pump factory has proved that the vacuum pump oil is too dirty, there is moisture in the oil, the wrong oil is used, the parts in the cavity are worn, and the clearance between parts is too large.

When repairing, the oil can be changed first because this method is the most convenient and effective method. Often some of the pump vacuum is not high, change the oil to solve. If the oil is not changed, the next step is to replace the oil for cleaning. The vacuum degree of the 2x-15 type pump is still 20 gauge after oil change, so it is decided to take it apart for inspection. After cleaning, measure the cavity size of parts and components, and find that the end clearance is 4-5 wires and partial shot. However, considering this kind of clearance, as long as the oil circuit is adjusted properly, pengyou can be installed, but it is still 20 gauge. When it is disassembled for the second time, check the out of perpendicularity (should be no more than half wire, i.e. Q005 mm). If it is found that it is not good, it is sent to the surface grinder to grind 2-3 wires from the cavity gamma surface, so that the fit gap between the rotary blade and the end cover of the cavity is less than 2-3 wires, and the non perpendicularity is qualified. In this way, after re assembly, the problem is solved. The vacuum degree reaches 70 grid ((about 1.5 * 10-2 Torr), which has met the production use.

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Main features of stainless steel magnetic pump

Stainless steel magnetic pump (hereinafter referred to as magnetic pump) is a new product which uses the working principle of permanent magnetic coupling for centrifugal pump. It has reasonable design, advanced technology, full sealing, no leakage and corrosion resistance, and its performance reaches the advanced level of foreign similar products.

The static seal is used to replace the dynamic seal in the magnetic pump, so that the overflow parts of the pump are completely sealed, which completely solves the problems of the mechanical seal of other pumps, such as running, emitting and dripping. Magnetic pump uses corrosion-resistant, high-strength engineering plastics, corundum ceramics, stainless steel as manufacturing materials, so it has good corrosion resistance, and can make the medium to be transported free from pollution.

Magnetic pump has compact structure, beautiful appearance, small volume, low noise, reliable operation and convenient maintenance. It can be widely used in chemical, pharmaceutical, petroleum, electroplating, food, national defense, scientific research institutions, metallurgy, dyes and other units to pump acid, alkali, oil rare precious liquid, poison, volatile liquid, as well as circulating water equipment and filter matching. In particular, easy to leak, flammable, explosive liquid pumping. The pump is more ideal for explosion-proof motor.

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Vacuum check valve

Vacuum pump equipped with the vacuum check valve is also known as one-way valve or check valve, its role is to prevent the medium flow back in the pipeline. It is also a check valve. Vacuum check valve is widely used in vacuum pump.

In the process of starting and stopping the vacuum pump, the vacuum check valve can better protect the pump and the pumped system, so as to make the vacuum pump play better performance and increase the service life. The opening and closing parts open or close automatically by the medium flow and force to prevent the reverse flow of medium is called check valve.

Check valve is an automatic valve, which is mainly used in the pipeline with one-way flow of medium. It only allows the medium to flow in one direction to prevent accidents. According to the structure, vacuum check valve can be divided into lift check valve, swing check valve and butterfly check valve. Lifting check valve can be divided into vertical and horizontal two kinds.

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Structure and operation principle of reciprocating vacuum pump

Reciprocating vacuum pump suction gas pressure is far lower than absolute atmospheric pressure, so it must be operated in the case of large compression ratio

It is generally considered that the clearance of reciprocating vacuum pump must be less than 3%. In order to reduce the influence of clearance gas, the vacuum pump is specially treated in structure. In other words, a balance channel is set on the wall of the vacuum pump. When the exhaust process of the piston is just completed, the balance channel can be connected. Some of the gas in the clearance flows to the other side of the piston to reduce the pressure of the clearance gas and improve the production capacity.

In addition, compared with the reciprocating compressor, the suction valve and exhaust valve of the vacuum pump have smaller opening and closing resistance due to the small pressure difference inside and outside the cylinder, so the sliding block mechanism closely matched with the piston movement can improve the efficiency of the pump

The higher the vacuum degree of reciprocating vacuum pump is, the smaller the absolute pressure of suction pressure is. Therefore, the less air volume can be inhaled in a certain volume of cylinder. Therefore, when the suction volume increases, the vacuum degree will inevitably decrease. In order to maintain a certain degree of vacuum and make the production not affected, it is required that the vacuum pipe system should not leak and the equipment should not leak.

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Application preparation of vacuum pump unit

When using a pump can not meet the requirements of pumping and vacuum, several pumps need to be combined to complement each other to meet the process requirements. The combined vacuum pump is called vacuum pump unit. The vacuum pump unit can make the vacuum system obtain better vacuum degree and exhaust volume, and the vacuum pump unit with high adaptability can make the working condition application obtain high application efficiency. Therefore, we should select the vacuum pump unit correctly.

The application of vacuum pump unit needs to make corresponding preparations, such as the selection and assembly of vacuum pump unit.

The vacuum pump unit shall be selected and applied according to the medium conditions, environmental requirements and working condition specifications of the application project. When extracting the gas, it is necessary to know the composition of the gas and the composition of the extracted gas. The gas contains no condensable steam, whether there is particle dust, whether there is corrosiveness, etc. Select the appropriate pump for the extracted gas. If the gas contains steam, particles and corrosive gas, auxiliary equipment, such as condenser, dust remover, etc., shall be installed on the air inlet pipeline of vacuum pump unit.

When using the vacuum pump unit with oil seal vacuum pump, it is necessary to determine whether the vacuum system has requirements for oil pollution. If the equipment is strictly oil-free, all kinds of oil pumps should be selected, such as: water ring pump, low temperature pump, etc. In addition, the impact on environmental pollution should be considered. If the environment is not allowed to be polluted, the oil-free vacuum pump should be selected, or the oil vapor should be discharged to the outdoor. If the requirements are not strict, oil pump can be selected, and some anti oil pollution measures, such as adding cold well, oil trap, baffle, etc., can also meet the requirements of clean vacuum.

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magnetic drive pump advantages and disadvantages

The magnetic drive pump uses the magnet to attract the ferromagnetic material and has the magnetic effect between the magnet or the magnetic field; the non ferromagnetic material does not affect or rarely affects the magnitude of the magnetic force, so it can carry out the power transmission through the non-magnetic conductor (isolation sleeve) without contact, this kind of transmission device is called the magnetic coupling. The motor is connected with the external magnetic steel through the coupling, and the impeller is connected with the internal magnetic steel. A fully sealed isolation sleeve is arranged between the outer magnetic steel and the inner magnetic steel to completely separate the inner and outer magnetic steel, so that the inner magnetic steel is in the medium, and the rotating shaft of the motor directly drives the impeller to rotate synchronously through the suction of the magnetic pole between the magnetic steel.

Its main advantages: because the transmission shaft does not need to penetrate into the pump housing, but uses the magnetic field to drive the inner rotor through the air gap and the thin-wall transmission torque of the isolation sleeve, so the leakage channel of the shaft seal is fundamentally eliminated, and the complete seal is realized; the transmission power has the function of overload protection; in addition to the high requirements of magnetic materials and magnetic circuit design, the technical requirements of other parts are not high; The workload of maintenance and repair of magnetic drive pump is small.

Its main disadvantages: the efficiency of the magnetic drive pump is lower than that of the ordinary centrifugal pump; the material and manufacturing requirements of the isolation sleeve against single side leakage are higher; because of the limitation of the material and magnetic drive, the magnetic drive pump is generally only used to transport the medium below 100 ℃ and 1.6Mpa in China; Due to the poor wear resistance of the isolation sleeve material, the magnetic drive pump is generally used to transport the medium without solid particles; the coupling has a high centring requirement, and the improper centring will lead to the damage of the bearing at the inlet and the wear of the isolation sleeve against single side leakage.

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Vacuum system of refrigeration equipment

Vacuum pumping is an essential process before filling refrigerant in the process of production or maintenance of refrigeration equipment. That is, the vacuum pump is connected with the refrigeration system pipeline to remove the non condensable gas and water in the system pipeline.

Hazards of not vacuuming:

Blocking the pipeline: if the water content of the system exceeds a certain limit, ice blocking will be formed at the capillary outlet, so that the refrigerant can not circulate normally.

Corrosion: water reacts with refrigerant, hydrochloric acid and fluorine acid will damage the insulation layer of compressor.

Copper plating and rusting: the oxygen in the residual air reacts with hydrochloric acid and copper to produce copper plating, which corrodes the copper and iron parts in the system pipes and shortens the service life of system parts.

Decomposition of refrigerant: oxide produced by corrosion will accelerate the decomposition of refrigerant.

Deterioration and aging of lubricating oil: the oxygen in the residual air will oxidize the frozen lubricating oil to decompose and deteriorate the lubricating oil.

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What is the main purpose of the crude vacuum system

It is mainly used to extract air and other gases with certain corrosiveness, insoluble in water and small amount of solid particles. It is widely used in vacuum evaporation, concentration, impregnation, drying and other processes in food, textile, medicine, chemical and other industries. The pump is characterized by high vacuum, simple structure, convenient use, reliable operation and convenient maintenance.

Mainly used for rough vacuum. In the process of large air extraction. It is mainly used to extract air and other non corrosive, insoluble in water, containing a small amount of solid particles, so as to form a vacuum in a closed container. A small amount of liquid is allowed to mix in the aspirated gas. It is widely used in machinery, pharmaceutical, food, petrochemical and other industries.

It is one of the main vacuum equipments to obtain the coarse vacuum. It is widely used in chemical, food, building materials and other sectors, especially in vacuum crystallization, drying, filtration, evaporation and other processes.

The oil-free (corrosion-resistant) vertical reciprocating vacuum pump is an updated product of the horizontal vacuum pump, and it is the main equipment to obtain the coarse vacuum. Due to the use of full sealing device, the crankcase and cylinder are completely isolated; in addition, the piston ring is made of self-lubricating material, so the advanced oil-free lubrication is realized. As there is no sewage discharge, the vacuum pump is especially suitable for the vacuum distillation, vacuum evaporation, vacuum drying, vacuum concentration, vacuum impregnation and other processes in chemical, pharmaceutical and food industries.

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Causes of oil trapped in screw vacuum pump

Causes of oil trapped in screw vacuum pump

Screw vacuum pump in the use of the process, sometimes there will be oil trapped problem, how to solve it?

In order to supply oil continuously, screw vacuum pump requires that the overlap coefficient e of gear engagement is greater than 1, that is, when one pair of gears is not disengaged from engagement, the other pair of gears have entered into engagement. In this way, when the screw vacuum pump has two pairs of gears meshing at the same time, a closed volume is formed between the two pairs of gears' tooth direction meshing lines

When the sealing volume is reduced, the trapped oil is squeezed and the pressure rises sharply, which makes the bearing suddenly subject to a large impact load, and the screw vacuum pump vibrates violently. At this time, the high-pressure oil is squeezed out from all possible leaks, resulting in the power loss of the screw vacuum pump and the oil heating, etc

When the sealing volume increases, because there is no oil supplement, a local vacuum of the screw vacuum pump is formed, which separates the air dissolved in the oil and forms bubbles. After bubbles are generated in the oil, a series of problems such as noise and cavitation of the screw vacuum pump will be caused

The above situation is the phenomenon of oil trapped in screw vacuum pump, which will seriously affect the working stability and service life of screw vacuum pump

In order to solve the problem of oil entrapment, two oil entrapment unloading grooves can be milled on the pump cover of screw vacuum pump. The position of the unloading tank should be such that the trapped oil chamber can be connected with the pressure oil chamber through the unloading tank when it is changed from large to small, and can be connected with the oil suction chamber through another unloading tank when the trapped oil chamber is changed from small to large. The distance between the two unloading tanks shall ensure that the oil pressure cavity and the oil suction cavity cannot communicate at any time.

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Advantages of liquid ring vacuum pump

The old vacuum pump has obvious defects in use. For example, it can only transport and extract gases with relatively clean air quality. It is difficult to realize the application of vacuum pump for some air containing relatively high quality water vapor or relatively high condensed particles or some poisonous, flammable and explosive gases. At this time, the vacuum pump is difficult to use, the emergence of liquid ring vacuum pump is in line with the market demand, to meet the market trend, its main application advantages have been widely recognized.

The new liquid ring vacuum pump can satisfy the function of suction with water, and its structure is relatively simple. You can assemble it yourself. Because of the integrated control, it is more convenient to use. Even inexperienced people don't have to worry about damaging the delivery pump, so they can make vacuum containers in a vacuum environment. Relatively speaking, this way is safer and greatly improves people's work efficiency.

With the emergence of liquid ring vacuum pump, people can pump in a relatively special air environment. For example, in flammable and explosive gas, toxic gas or gas containing water vapor, or gas containing condensed particles, free vacuum environment can be generated, which is not easy to cause danger in the use process. It is also relatively safe for staff. At present, this kind of mechanical equipment has been widely used in medicine, food, metallurgy, chemical industry, textile, leather printing and dyeing industries, and has been widely used.

Because this kind of liquid ring vacuum delivery pump can meet the needs of bad working conditions, it has been widely used in many chemical fields, greatly improving the safety of users and preventing accidents.

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Use of Roots vacuum unit

The continuous development of science and technology has promoted the upgrading of products in various industries, and roots vacuum unit is the superior product brought by the progress of the times. Roots vacuum pump is a kind of variable volume vacuum pump with good performance, but we should avoid some misunderstandings when using, which may bring great impact on our production and operation. So what mistakes should we pay attention to? Let's talk about them one by one.

1. If the vacuum degree of Roots vacuum unit is reduced during the use, it is necessary to check whether the gap between the rotors of roots pump has changed to some extent. If the gap between the rotors of roots pump becomes larger, it is necessary to replace the roots pump, because this kind of roots pump does not make static and dynamic balance for the rotors of roots pump in the production and processing process, or uses shaft sleeve seal Of.

2. Roots vacuum units are mostly used in Roots vacuum units, which are mainly used to improve the pumping speed and vacuum degree. The middle distribution between roots vacuum pump and the front pump needs to be equipped with a bypass valve, which can effectively protect roots pump. If the front pump is not stable, then roots pump will play an effective role in protecting the whole life of the vacuum pump unit Life will be prolonged.

3. The roots vacuum unit must be equipped with a front stage pump when it is used. Roots pump cannot be used alone.

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