The filtering mode of the oil filter

Filtration process: the porous permeable medium is used to filter out the insoluble substance in the oil solution to separate solid particles > 1 m. The paper fiber can absorb a small amount of water.
Electrostatic process: the electrostatic field force is used to make the non-soluble pollutants in the oil adsorbed on the dust collector in the electrostatic field to separate solid particles, sludge and < 1 m "soft particles".
Magnetic process: Separation of ferromagnetic particles by magnetic field force to absorb the ferromagnetic particles in the oil character.
Centrifugal oil filter:
By means of mechanical energy, the oil can move in a circular motion, and the radial acceleration generated can be used to separate larger solid particles, free water and a small amount of emulsified water from insoluble substances with different oil density.
Coalescing oil filter:
A mixture of two insoluble liquids is used to separate free water and a small amount of emulsified water based on the difference in the wetting (or affinity) of the two liquids to a multi-pore medium.
Vacuum oil filter:
By using the difference of saturated vapor pressure under negative pressure, the moisture and air in various forms in oil can be separated from other liquids or gases.
Adsorption: Separation of solid particles, free water and emulsified water from soluble and insoluble substances in oil by molecular adhesion.
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Oil filter equipped with filter element

The oil filter is equipped with automatic detection function of filter element pollution degree
Only when we realize the function of transformer oil filter, can we apply it to real life correctly. The oil filter tells you to know that the transformer oil filter has super filtration and purification effect, which can extend the service life of transformer oil.
The first dehydration effect does not need to be emphasized again, because one of the biggest functions of the transformer oil filter itself is dehydration effect, and the other is degassing. Dingneng brand new transformer oil vacuum oil filter has multi-stage design, built-in secondary evaporation interlayer, and special vacuum packing, which can increase the contact area of oil film and quickly separate water and gas in oil.
In addition to dehydration and degassing, the transformer oil filter also has the function of removing impurities. The high β value precision filter material of the transformer oil vacuum oil filter adopts multi-stage filtration and step-by-step densification to remove the fine particles in the oil. In the process of filtration and purification, transformer oil filter is equipped with automatic detection function of filter element pollution degree due to its large filter element volume, large pollution capacity and long service life. In the process of using transformer oil filter, it is estimated that the processing personnel can clearly see this point. In addition, many functions of transformer oil filter are expected to be understood thoroughly only by those who really use it.
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General usage of plate and frame pressure oil filter equipment

Before operation, carefully clip the filter paper with well punched holes between each filter plate and filter frame. The quantity of each layer of filter paper is generally 2-3 pieces, depending on the filtration requirements and the quality of filter paper. When clamping the filter paper, make sure that the two oil holes on the filter paper and the oil holes on the filter plate filter frame are the same. Filter paper should be dried before use at a drying temperature of about 120℃. When using the used filter paper, the filter paper must be dried, and there should be no damage, pay attention to the filter residue side (dirty side) should be placed against the filter frame, not against the filter plate, so as not to filter residue in the process of washing down, contaminating the filtered oil. When the filter pressure is high and the filter paper is found to break, the filter cloth can be lined on the ground side of the filter plate to increase the strength of the filter paper.
After the filter paper is put in place, turn the handwheel to press the filter plate. When pressing the filter plate, only one person is allowed, and the press handle should not be lengthened for tightening, so as not to damage the equipment. Close the sampling valve. If there is a valve on the oil drain line, open the valve.
Switch on the motor power and make the oil filter work. The normal working pressure of the oil filter will change with the viscosity of the oil filtered and the resistance of the pipeline expelled. Generally, the initial pressure of filtration is low in the range of 0.05~ 0.mpa. With the increase of water absorbed by the filter residue and filter paper, the pressure will increase gradually.
In the process of oil filtration, the oil sample can be extracted by unscrewing the nozzle for sampling. After filtration, loosen the pressing device, take out the filter paper piece by piece, clean the filter paper and filter residue in the filter frame, replace the filter paper and clamp the pressure again, and cover the oil tank.
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Heat resistant steel furnace

The degree of heat resistance and manufacturing technology of heat - resistant steel furnace

Heat resistant steel furnace is used in heat treatment furnace accessories, it is commonly used material is CrMnN, Ni7N, 2520 and other heat resistant steel, the degree of heat resistance of different materials are also different. For example, cr-Mn-N furnace tank is suitable for 850℃ ~ 900℃; ZG35Cr24Ni7N heat treatment equipment vacuum furnace suitable for 900℃ ~ 1050℃; ZG40Cr25Ni20Si2 furnace tank is suitable for 1050℃ ~ 1150℃.
High temperature strength refers to the ability of steel to withstand mechanical loads for a long time at high temperatures. Steel is softened under mechanical load at high temperature, that is, its strength decreases with increasing temperature. The second is creep, that is, under the action of constant stress, the plastic deformation increases slowly with the extension of time, and the plastic deformation of steel at high temperature is caused by intra - grain slip and grain boundary slip. Alloying is usually used to increase the high temperature strength of steel. It is also the addition of alloying elements to steel to enhance the bonding strength between atoms and to form favorable structures. By adding chromium, molybdenum, tungsten, vanadium, titanium, etc., the matrix of steel can be strengthened, the recrystallization temperature can be raised, and enhanced phase carbide or intermetallic compounds can be formed, such as Cr23C6, VC, TiC, etc. These hardened phases are stable at high temperatures, insoluble, do not aggregate and grow, and maintain their hardness. Nickel was added mainly to get austenite. Austenitic atoms are more closely arranged than ferrite atoms, and the bonding force between atoms is stronger. So austenite is stronger at high temperatures. It can be seen that the high-temperature strength of heat-resistant steel is not only related to the chemical composition, but also related to the structure.
Heat resisting steel furnace can be divided into cover furnace, nitriding furnace, carburizing furnace, star anise furnace, cylinder furnace, heat treatment furnace, CRMNN furnace, centrifugal furnace, etc. It can also produce non-standard furnace tank according to customers' requirements, which can withstand 1150 degree high temperature, and not easy to denatured, heat and corrosion resistant.
At present, there are two kinds of heat-resistant steel furnace tank, one is casting, one is welding, welding material, Swedish plate 310S as the best, the life can go to 2-5 years, and this material of heat-resistant steel furnace tank weight is lighter, heat faster, more energy saving, quality is the best.
Heat resistant steel furnace tank, of course, also can use the centrifugal casting process, apply for centrifugal casting process of the seamless pipe in tank top casting furnace, tube wall tissue density high, uniform wall thickness fluctuation, more solid and durable, not easy appear high temperature deformation, the service life of the warranty in more than one year, product advantages more apparent.
Among the many heat-resistant steel brands, the following factors must be considered comprehensively when choosing heat-resistant steel that meets the working conditions of the cement plant:
(1) The working temperature of heat-resistant steel castings. Operating temperature refers to the highest, normal and lowest temperatures and the rate of change of temperature.
(2) Mechanical load of heat-resistant steel castings.
(3) Gas in contact with heat-resistant steel castings and their conditions (including wind speed dust content, chemical composition, etc.).
(4) The price should be low, where can use chromium, nickel content low cast heat resistant steel, not high chromium, nickel content.
The experience of using heat-resistant steel castings should be constantly summarized and accumulated in cement plant. If there is failure problem in use and it is proved by analysis that the abnormal scrap of heat-resistant steel castings is caused by improper material selection, the manufacturer can contact with the manufacturer to prevent failure by studying the material selection. The manufacturer should provide the material selection data and indicate the direction to the using factory.
In a word, heat-resistant steel furnace and tank products have a series of advantages, such as high temperature resistance, high strength, not easy to deformation, good oxidation resistance, etc., so the furnace and tank are widely used in heat treatment, can also meet the special casting requirements of metallurgy, mining, petrochemical, shipping, building materials, electric power, light industry, machinery, military industry and other industries.
In fact, in addition to heat resistant steel pot, similar to the heat resistant steel workpiece there are many, are to meet the special requirements of the processing was introduced. Metal heat treatment equipment as a specific special properties of material, heat resistant steel has many USES, can play an important role in various industries.
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What points should be paid attention to when welding heat-resistant steel

What points should be paid attention to when welding heat-resistant steel castings? Today, let heat resistant steel casting to give you a detailed talk about this problem!
Main point 1: The welding position of heat-resistant steel casting should choose welding, symmetry welding, then the overall welding method, in order to prevent the stress of the casting split, welding a layer (inner lapping), if the joint is small, can choose 3.2 welding wire. Welding wire 4.0 can be used for the second layer of electric welding. As the casting is very large, 1/6 turn can be used for piecewise welding.
Main point 2: For the crack of heat-resistant steel casting in electric welding, the weld should be cut along both sides of the crack first, and the deep and long of the weld should be removed and then welded again. Electric welding crack should be the first stainless steel head, from the crack root just started along the crack welding. For the strength of more than HRC38, cover to choose AI02 wire.
Point 3: For the layered welding part, the welding skin should be cleaned after the temperature of the first layer is cooled to 200-300℃, and then the second layer is welded, and so on.
Main point four: laser cutting and welding opening can be carried out with oxyacetyl block flame according to the working condition on the spot, so as to ensure the welding quality of electric welding. The surface layer of casting parts should be eliminated and cleaned to prevent defects such as oil stains and welding nodules.
Basic methods to solve the problem of heat-resistant steel casting:
Description of phenomena -- analysis of causes -- formulation of measures -- verification of effects -- further improvement
That is to engage in heat-resistant steel forging, it is necessary to put forward countermeasures from the root cause of air vent. Because you are in the scene, the idea that everybody gives is also about, cannot analyze the situation on the spot deeply for you, want to rely on oneself colleague to analyze well to be able to solve difficulty truly.
A few points for reference:
1. How dry is the core sand? Are there any organic impurities mixed in?
2. Does casting ladle overpack so that more air is brought in? Can I change the small bags for pouring?
3. How about the aeration of the casting mold and sand core?
4. Whether there are design defects in gating system design
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How does the oxygen valve work and operate?

When talking about the oxygen valve, many people think of the oxygen meter, which is often used by the oxygen valve, also known as the oxygen reducing valve. Oxygen valve is often used in physical and chemical experiments, and often use oxygen, nitrogen, hydrogen, argon and other gases. All of these gases are stored in a high-pressure gas cylinder, which is, of course, a dedicated high-pressure gas cylinder. During use, the pressure of these gases is reduced to the required range through the pressure reducing valve, and then fine-tuned through other valves to feed these gases into the system in use.
How the oxygen valve works
The high pressure chamber of the oxygen valve is usually connected to the cylinder, and the low pressure chamber is the outlet of the gas, which is usually connected to the service system. The gas pressure stored in the cylinder is marked by a high pressure gauge. The outlet pressure of the low pressure gauge can be effectively controlled by an adjusting screw.
In general, oxygen valves have safety valves, safety valves are used to protect the pressure relief valve, and make the valve for safe use. At the same time, the relief valve is also a relief valve, a signal device in case of failure, if the relief valve failure, the relief valve will have a clear display.
Use method of oxygen valve
In the use of oxygen valve, must be used in accordance with the requirements, so in the process of operation, will not appear problems. And the oxygen valve should not be in contact with grease, or there will be a fire. When the valve stops working, to put the remaining gas clean, and then the adjustment screw in the state of relaxation, so as to effectively prevent long-term compression deformation phenomenon.
The above is about the oxygen valve related knowledge, consumers in the use, must understand these related knowledge clearly, so as to better use.
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Experience of needle valve

Needle valve is a type of valve, because its round core is like the tip of a needle, so it is called needle valve. Its characteristic is to be able to adjust freely, generally all the valves are used to do blocking function, such as for water, oil, steam, etc. The use is very extensive, for example, in the welding work needs the needle valve to control the flame after heating, if the control is not good, it is easy to have problems such as welding is not firm, or desoldering.
Needle valve pressure is much greater than other valves, in addition, when choosing to use needle valve, we must consider several situations: the needle valve is installed in the use position, whether its pressure is appropriate, whether it can withstand high temperature when selecting materials, if it is used on the head of welding gun for welding, it must be resistant to high temperature.
In addition, its corrosion resistance should meet the standard. In the pipeline with gas, stainless steel, carbon steel and other extremely anti-corrosion materials should be adopted as far as possible to ensure safety. When the degree of corrosion is not too serious, when the temperature and pressure are not too large, the needle valve of non-metallic material can also be selected. For example, when the pipeline is filled with water, plastic materials can be used instead of stainless steel. Not only considering the hidden danger of appearance, but also protecting the outside. You can paint some pigment or paint as a new protective layer.
In determining the use of needle valve installation, to consider its appearance in your use is convenient, beautiful, the position is accurate, whether the installation is firm, these will affect the use of needle valve quality and effect, there is the most important installation to check whether it has sealing, such as improper sealing will also cause safety hazards and economic losses.
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Is the check valve a double pass valve?

Check valves are double-pass valves, meaning they have two openings in the body, one for fluid entry and one for fluid exit. Various types of check valves are available for a wide variety of applications. Check valves are usually part of common household items. Although they come in a variety of sizes and costs, check valves are usually very small, simple, or inexpensive. Check valves operate automatically, most of which are not controlled by human or any external control; As a result, most do not have any valve handle or stem. The main body (housing) of most check valves is made of plastic or metal. An important concept of check valves is the open pressure, which is the minimum differential pressure upstream between the inlet and outlet when the valve is in operation. Typically, check valves are designed for and can therefore specify specific opening pressures.
Type of check valve

Ball check valve
A ball check valve is a one-way valve wherein the shutoff member, the movable part, to block the flow, is a ball. In some ball check valves, the ball is spring-loaded to help keep it closed. For those without springs, reverse flow is required to move the ball toward the seat and seal. The inner surface of the main seat of the ball check valve is more or less conical to guide the ball into the seat and form a positive seal when reverse flow is stopped. Ball check valves are usually very small, simple and inexpensive. They are commonly used in liquid or gel micro pump dispensers, spray devices, some rubber balls for pumping air, manual air pumps and some other pumps, and refillable dispensing syringes. Although balls are usually made of metal, they can be made of other materials; In some special cases, it is made of a highly durable or inert material, such as sapphire. High-pressure HPLC pumps and similar applications typically use small inlet and outlet ball check valves with (artificial) ruby ball and sapphire seats [6] or ball and Ruby seat [7], hardness and chemical resistance. Over time, the check valve will eventually wear out or the seat will crack and need to be replaced. The valve is therefore replaceable, sometimes in a small plastic body fitted tightly into a metal fitting that can withstand high pressure and be screwed into the pump head. There are similar check valves in which the disc is not a ball but some other shape, such as a spring-actuated lift valve. Ball check valves should not be confused with ball valves, which are a different type of valve in which the ball ACTS as a controllable rotor to stop or guide the flow.

Swing check valve
Swing check valves or tilting disk check valves are one-way valves in which the disc, when movable, blocks flow and the hinge or pivot on the swing, either blocks reverse flow in the seat or leaves the seat to allow forward flow. The seat opening cross-section may be perpendicular to the center line between the two ports or at an Angle. Although swing check valves may be available in a variety of sizes, large check valves are usually swing check valves. Common problems caused by swing check valves are known as water hammers. This occurs when the swing check is closed and the flow stops abruptly, causing pressure fluctuations that cause high-speed shock waves to act on pipes and valves, putting a lot of pressure on the metal and vibration in the system. Undetected water hammer can damage pumps, valves and piping in the system. The baffle valve in flushing toilet mechanism is an example of this type of valve. The tank pressure to keep it closed was overcome by manually lifting the baffle. Then it stays open until the tank drains and the baffle falls due to gravity. Another variant of this mechanism is the disc for use in applications such as fire protection and fire life safety systems. Hinged doors remain open only in the direction of inflow. The disc usually also has a spring that keeps the gate closed when there is no forward pressure. Another example is the backwater valve (used in sanitary drainage systems), which prevents flooding caused by backflow of sewage. This risk most often occurs in sanitary and drainage systems connected to the combined sewerage and stormwater drainage systems. This can be caused by heavy rainfall, melting or flooding.

Lift check valve
A lift check valve is a one-way valve in which the disc, sometimes referred to as an elevator, can be lifted off its seat by a higher pressure of the inlet or upstream fluid to permit flow to the outlet or downstream side. The guide keeps the disc moving in a vertical line so that the valve can be reinstalled correctly at a later time. When the pressure is no longer high, gravity or higher downstream pressure will cause the disc to drop onto its seat, closing the valve to stop reverse flow. An in-line check valve is a check valve similar to a lift check valve. However, the valve usually has a spring that "rises" when there is pressure on the upstream side of the valve. The pressure required to overcome spring tension on the upstream side of the valve is called "open pressure". When the pressure through the valve is lower than the opening pressure, the spring will close the valve to prevent backflow during the process.

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