Pneumatic pneumatic valves have been born as a tool in one thousand

is a kind of pneumatic valve used in gas liquid transmission and control of a tool, with at least one thousand years of history. At present in the fluid piping system, regulate the pneumatic valve is a control element, its main function is to isolate equipment and piping system, regulating flow, preventing backflow, and discharge pressure. Because the pipeline system to select the most appropriate adjust the pneumatic valve is very important, so, understand the characteristics of pneumatic valves and pneumatic valve steps and basis also became more critical. Nominal pressure of the pneumatic valve nominal pressure of the pneumatic valve is associated with the mechanical strength of pipe components design for a given pressure, that is to say, is the job of the pneumatic valve in the specified temperature, pressure, and it is associated with the material of pneumatic valves, different materials, it allows the working temperature and working pressure is not the same, therefore, the nominal pressure pneumatic valve is a depends on material, and is associated with the allowed working temperature and working pressure of material parameters. Pneumatic valve is one of the medium circulation system or pressure system, it is used to adjust the flow or pressure of medium. Other functions including cut off or connect medium, control of flow rate and flow direction of medium change, prevent the reverse flow of medium, control of pressure or purging put pressure. These functions are accomplished by regulation of pneumatic valve closed position. This adjustment available manual operation, also can be automated. Manual also includes using manual control operation of the drive. Manual operation of pneumatic valve is called manual pneumatic valve. To prevent the backflow of pneumatic valve check pneumatic valve; Call security control xie put pressure pneumatic valve or security xie pressure pneumatic valve. Pneumatic valve industry so far, has been able to produce all kinds of pneumatic valve gate, globe pneumatic valve, throttle valve, cock pneumatic valve, pneumatic ball valves, electric pneumatic valve, pneumatic diaphragm regulating valves, check pneumatic valve, safety valve, vacuum pneumatic valve, pneumatic valve steam traps and emergency cut-off pneumatic valve, and other categories, multiple types, multiple specifications of the pneumatic valve products. Maximum working pressure for the MPa, maximum nominal size of the mm, the highest working temperature is ℃, the lowest working temperature for - ℃, the suitable medium for water, steam, oil, natural gas, the corrosive medium ( Such as nitric acid, the concentration of sulfuric acid and so on. Notice: in the selection of pneumatic valves, in order to reduce the pipeline turns the soil depth, general large diameter pipe matching butterfly pneumatic valve; Pneumatic valve butterfly butterfly plate are the main disadvantages of occupy certain water cross section, the increase of head loss; , conventional pneumatic valves have butterfly valve, pneumatic valve, pneumatic ball valves and cocks pneumatic brake valve, such as the selection should be considered in the range of pneumatic valves used in water supply network. , pneumatic ball valves and cocks pneumatic valve casting and machining difficulty is big, the price is more expensive, general suitable for small diameter pipeline. Pneumatic ball valves and cocks pneumatic valve, pneumatic valve sheet, keep the gate small flow resistance, reliable seal, flexible movement, convenient operation and maintenance. Cock pneumatic valve also has similar advantages, but water cross section is not round. , the impact is not big on the depth of overlying soil, equipped with pneumatic valve gate; Electric brake pneumatic valve of large diameter vertical brake turns the soil depth influence the height of the pneumatic valve pipe, large diameter horizontal gate increased the length of the pneumatic valve pipe transverse area, affect other pipeline arrangement; In recent years, due to the foundry technology improvement, adopting the method of resin sand casting, can avoid or reduce mechanical processing, which reduces the cost, therefore the pneumatic ball valve used in large diameter pipeline feasibility worth exploring. As for the diameter size of the line should be taken into account according to the specific situation around.