The selection of safe backflow preventer: is determined by the operating pressure of the relief valve nominal pressure, is determined by the operating temperature of the relief valve using temperature range, up to calculate the relief Industrial Valves set pressure value of the spring or leverage constant pressure range, then determined according to the working medium of the relief valve material and structure, according to the relief valve discharge capacity calculated the throat area of the relief valve. The following general rules for safety Industrial Valves 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 Industrial Valves. ( 7) Large diameter, large displacement and high pressure systems generally use impulse safety valve, such as the reduction temperature and pressure relief devices, power plant boiler, etc. ( 8) The train transport liquefied petroleum gas tank car, car tank, storage tank and so on general with built-in safety valve. ( 9) Tank top general use hydraulic safety valve, should be used with breather valve. ( 10) Underground drainage or gas pipeline with pilot operated relief valve in general. ( 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. In this paper, the keyword search: more technical articles valve product supply information
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