Pipeline transmission media filter is indispensable on a device, usually installed in the valve, pressure relief valve, water valve or other device set the import side, the medium used to remove impurities, to protect the valves and equipment normal use. When the fluid into the home of a certain size filter cartridge, its impurities are blocked, and clean filtrate from the filter outlet drain cleaning when necessary, as long as the removable cartridge removed, re-processed into the can, therefore, maintenance is extremely easy to use. According to the filter medium is divided into: 1 air filter allows contaminated air is clean to the production and living needs of the state, that is, clean the air up to a certain degree. 2, liquid filter allows contaminated liquid to be purified to the production and living needs of the state, that is, the liquid up to a certain degree of cleanliness. 3 network by setting up filters to block spam, resorted to the information on the computer screen is now possible to meet the requirements. With the principle of absorption of light of different colors separated 4 light filter to absorb unwanted light. Follow the installation method: oil filter oil filter return line filter according to performance is divided into: line filter binoculars filter above said high-pressure filter should comb filter, in fact, there are many filters, such as laminated filter, sand filter, carbon filter, etc. The main principle is the use of filter media pore diameter smaller than the media retention of the material, of course, some adsorption filter media also has special effects. Most of the filter backwash is not as troublesome as long as water with water from the filter end into reverse backwash filter media backwash can achieve good results. [Edit this section] test-bed filters for filter performance bench top, this test bed before going to trial the system in the strict purification, the test system and test system for the service of pollution into the system to be equipped with filters, This is the filter and the filter being tested is different from children, it's accuracy, the amount of dirt required to accommodate the filter to be tested than high precision, the same test system for the distinction of two types of filters, such filters known as test-bed filter, the filter being tested is called the filter is tried. The general principles of selection filters: 1, import and export path: In principle, the import and export filters should not be less than the diameter of the pump to match the import path, generally with the import pipeline along the same lines. 2, nominal pressure: According to the filter pipeline to determine the maximum pressure that may arise filter pressure levels. 3, the choice of mesh hole: consider the need to intercept the main impurities in size, according to media process technology requirements. All kinds of mesh size can be intercepted under the table size check "filter specifications." 4, filter materials: filter material is generally connected with the selection process piping material of the same conditions of service for different options to consider cast iron, carbon steel, low alloy steel or stainless steel filter. 5, filter pressure drop calculation of water filters, in general, calculate the nominal flow rate, pressure loss of 0.52 ~ 1.2kpa introduction of the hydraulic system oil filter device according to filtration (filtered of impurities particle size) is different, there coarse filter, regular filter, precision filter and special fine filters of four, they were able to filter out larger than 100μm, 10 ~ 100μm, 5 ~ 10μm and 1 ~ 5μm size of the impurities. Used oil filter, consider the following points: (1) filtration shall meet the scheduled requirements. (2) can be over an extended period to maintain adequate flow capacity. (3) filter has sufficient strength, not because of the role of hydraulic damage. (4) good corrosion resistance filter can be sustained in the specified temperature to work. (5) easy filter cleaning or replacement. Therefore, the filter should be based on the technical requirements of the hydraulic system by filtration, flow capacity, working pressure, oil viscosity, temperature and other conditions to identify its type. 2 installed oil filter in the hydraulic system is installed usually have the following: (1) to be installed at the inlet of the pump: pump oil on the road surface type are generally equipped with oil filter, the purpose is to filter out more large impurity particles to protect the pump, in addition to the filtering capacity of filter pump flow should be more than twice the pressure loss is less than 0.02MPa. (2) mounted on the pump discharge oil on the road: the purpose here to install the oil filter is used to filter out potentially invasive valve and other components of the pollutants. The filtration should be 10 ~ 15μm, and can withstand the pressure of work and the way the oil shock pressure, the pressure drop should be less than 0.35MPa. At the same time the safety valve should be installed to prevent the filter clogging. (3) installed in the system back to the oil on the road: this filter installed an indirect role. Generally connected with the filter and install a back pressure valve, when the filter is clogged to a certain pressure value, the back pressure valve is opened. (4) installed in the system branch oil on the road. (5) separate filtration system: dedicated a large hydraulic system can be composed of independent hydraulic pump and oil filter filter circuit. In addition to the hydraulic system needed to filter the entire system, but also often in a number of important elements (such as servo valves, precision throttle, etc.) in front of the separate installation of a dedicated fine filter to make sure they work properly. Y-filter Y-filter (water filter) is a coarse filter pipe line can also be used for gas or other media filter large particles, can be installed in the pipe to remove the larger solids in the fluid, the machinery and equipment (including compressors, pumps, etc.), instrument can work and operate to achieve a stable process to protect the safety role. Y-filter (water filter) has produced a simple, easy to install clean, pollutant carrying capacity and so on. Filter testing principle ※ bubble point method Test principle: When the filter membrane and complete infiltration with some solution, then pressurized air source on one side (inside the instrument we have intake control system can stabilize the pressure regulator into the gas), as the pressure increases, the gas released from the membrane side, showing the size of membrane on one side, varying amounts of air bubbles through the instrument to determine the corresponding pressure is the bubble point. ※ diffusion flow method Test principle: diffusion flow test is when gas pressure in the filter bubble point value of 80%, then a large number of gas has not been perforated, only a small amount of gas dissolved in the liquid phase of the membrane before and then spread to the liquid from the other side of the gas phase, called the spread of this part of the gas flow. ※ Why spread flow method is better: bubble point value is only a qualitative value, from the beginning to the final group of sparkling foam is a relatively long process, not an accurate quantification. The measured value is a quantitative diffusion flow value, not only can accurately determine the integrity of the filter, but also reflect the film porosity, flow rate and the effective filtration area, and other issues, which is why foreign manufacturers are now using diffusion flow method tests the integrity of reasons. ※ water intrusion method Test principle: water intrusion method dedicated to the hydrophobic filter test, water-resistant hydrophobic film, the smaller the aperture, the water need to squeeze into the hydrophobic membrane the greater the pressure. So at a certain pressure, the measurement of water flow to squeeze into the membrane filter to determine the aperture. Filter industry standards CJ / T 3068-1997 sintered porous polymer tube filters GB / T 13554-2008 HEPA filters GB / T 14295-2008 Air filter device GB / T 14382-2008 pipe with three-pass filter GB / T 17486-2006 hydraulic filters HG / T 21637-1991 chemical pipe filter HG / T 4085-2009 pressure-type fibers filter QB / T 1166-1991 double filter JB / T 7538-1994 Pipelines basket Filter SY / T 0523-2008 oil on a water filter device: Filter Caution Next: Overview of the vacuum valve filter Caution
