the structure characteristics of long distance pipeline ball valve: the Industrial Valves lumen stagnant medium due to temperature change and abnormal pressure, medium pressure to push the seat out of the sphere to achieve the effect of pressure relief automatically, automatic reset after unloading seat. When the one thousand fire or due to abnormal heat up to soften seat sealing loss or when the valve is still reliable operation, at the same time, the seat and ball form metal to metal contact, to temporarily seal effect, to stop the fire to further expand, comply with the provisions of the APIFA. Unscrew the discharge device can check whether the seat leak, can discharge midplane retentate reduce the pollution of the medium of the Industrial Valves. In working status, when the valve is in full open or close, can replace the valve stem packing. In addition to general seating, it sets the auxiliary seal structure, can play because of the sealing ring damage when a leak emergency rescue action. Stem parts adopt PTFR packing and 0 ring, especially suitable for the gas medium. Stem movement parts adopt high quality SF, self-lubricating bearings, a smaller friction system, to reduce operating torque. API pipeline ball Industrial Valves is suitable for ANSI Class 150 ~ 900, the working temperature 28 ~ 300 ℃ in the petroleum, chemical, thermal power plant under various working conditions such as the pipeline, cut off or connect medium. Applicable medium: oil, natural gas purification and acid gas, gas, water and medium coal slurry, etc. Operation mode: manual ball valve, turbine drive ball valves, pneumatic ball valves, electric ball valves, gas liquid linkage ball valve.

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