Introduction to technical and use requirements of imported valves

According to the function and application of the selected imported valve in the purification system, the corresponding technical requirements should be put forward, mainly including: reliability, rigidity, tightness, wear resistance, temperature resistance and corrosion resistance.
Inhalable particulate matter
Inhalable particulate matter refers to particulate matter suspended in air with an aerodynamic equivalent diameter of ≤10 microns. The concentration of respirable particulate matter is expressed in milligrams of respirable particulate matter per cubic meter of air. The "Ambient Air Quality Standard (GB3095-1996)" promulgated and revised by the State Environmental Protection Administration in 1996 renamed flying dust as inhalable particulate matter as the official atmospheric environmental quality standard.
The smaller the diameter of the particles, the deeper the area into the respiratory tract. 10 micron diameter particles are usually deposited in the upper respiratory tract, 5 micron diameter can enter the deep part of the airway, and below 2 micron can penetrate 100% into the bronchiole and alveoli.
Total suspended particulate matter refers to the collective name of solid and liquid particulate matter floating in the air, and its particle size range is about 0.1-100 microns. Some particles can be seen by the naked eye due to their large particle size or black color, such as soot. Some are small enough to be observed with an electron microscope. Particles with a particle size of less than 10 microns are usually referred to as PM10, also known as inhalable particles or flying dust. Inhalable particulate matter (PM10) lasts a long time in the ambient air, which has a great impact on human health and atmospheric visibility. Some particulate matter comes from direct emissions from pollution sources, such as chimneys and vehicles. Others are small particles formed by the interaction of sulfur oxides, nitrogen oxides, volatile organic compounds and other compounds in ambient air. Their chemical and physical composition varies depending on the location, climate, and season of the year. Great. Inhalable particulate matter usually comes from motor vehicles running on unpaved asphalt and cement roads, crushing and grinding of materials, and dust raised by the wind.
When inhalable particles are inhaled by people, they can accumulate in the respiratory system and cause many diseases. Exposure to coarse particles can damage the respiratory system and induce asthma. Fine particles can cause heart disease, lung disease, respiratory disease, and reduce lung function. Therefore, the risk is greater for sensitive groups such as the elderly, children, and those already suffering from cardiopulmonary disease. In addition, particulate matter in the ambient air is a major cause of reduced visibility and can damage building surfaces.