Safe backflow preventer: a protection system damaged valve because the pressure was too high, once the system and device or in medium pressure more than the set value, will automatically release the pressure, so as to achieve the goal of security and protection. Relief valve belong to automatic valve class, mainly for the boiler, pressure vessel and piping, control pressure shall not exceed the specified value, to protect personal safety and equipment operation plays an important role. The safe backflow preventer is there any standard? Secure the classification of the backflow preventer: a. According to its overall structure and the load mechanism of two different. According to the different methods of medium to discharge three. According to the size of the disc opens and four runner diameter. According to the five principle classification. According to the six pressure can regulate classification. According to the working temperature can be divided into normal temperature relief valve and the general rule of high temperature safety valve relief valve selection: ( l） Hot water boiler is not closed with a wrench is commonly used in micro and safety valve. ( 2) Steam boiler or steam pipe is not closed with a wrench is commonly used in the safety valve. ( 3) The incompressible liquid medium such as water use normally closed raise safety valve, or use the safety relief valve. ( 4) High pressure water supply with normally closed all safety valve, such as high pressure feed water heater, heat exchanger, etc. ( 5) Gases such as compressibility medium with normally closed all safety valve, such as gas storage, gas pipelines, etc. ( 6) E dead weight is commonly used in steam boiler safety valve. ( 7) Large diameter, large displacement and high pressure systems generally use impulse safety valve, such as desuperheating decompression device, such as power plant boiler, ( 8) The train transport liquefied petroleum gas tank car, car tank, storage tank and so on general with built-in safety valve, as shown in figure 4. ( 9) Tank top general use hydraulic safety valve, should be used with breather valve. ( 10) Underground drainage or gas pipeline generally use pilot operated relief valve, as shown in figure 6. ( 11) Liquefied petroleum QiZhan liquid-phase reflux tank pump discharge line generally use safe backflow preventer. ( 12) May produce negative pressure in the process of negative pressure or operating system generally use vacuum negative pressure relief valve. ( 13) Back pressure volatile and toxic flammable vessel or piping systems generally use corrugated tube valve. Safe backflow valve nominal diameter: DN 4 - technical indicators 25 ㎜ nominal pressure: PN 25 mpa applicable medium: oxygen, nitrogen, argon, air and other applicable temperature: - 40℃- + 80 ℃ body: cast steel/stainless steel seat: copper valve cap, valve stem: stainless steel spring: spring steel a protection system for the damaged Industrial Valves because the pressure was too high, once the system and device or in medium pressure more than the set value, will automatically release the pressure, so as to achieve the goal of security and protection. Another impulse safety valve, pilot operated relief valve, safety valve switch, security, decompression valve, such as static weight type relief valve. Spring loaded safety valve rely mainly on the spring force and work, spring loaded relief valve is closed and not closed, usually inflammable, explosive or toxic medium should choose enclosed, steam or inert gases can choose not enclosed, in spring safety valve with a wrench and not with a wrench. Spanner role mainly check the flexibility of the disc, sometimes also can be used as a manual emergency pressure relief, as shown in figure 3. Relief valve lever relies mainly on the lever and weight and the power of the work, but as a result of huge relief valve lever tend to limit the scope to choose. Higher temperature when choosing safety valve with radiator. Safe backflow preventer displacement is the main parameter, the displacement depends on the seat of the diameter and the opening of the disc height, by the opening height is different, is divided into tiny qi type and whole qi type two kinds. Tiny qi type refers to the opening height of the disc seat throat diameter of 1/40 ~ l / 20. All rev type refers to the opening height of the disc seat throat diameter of a quarter.
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