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API pipeline ball valve for ANSI Class 150 ~ 900, the working temperature of -28 ~ 300 ℃ of petroleum, chemical, thermal power stations and other conditions of the pipeline, cut off or connected to the media. Applicable medium: petroleum, purified natural gas, acid gas, gas, water and coal slurry and so on medium. Mode of operation are: manual, turbine transmission, pneumatic, electric, gas-liquid interaction. The structural features of the long-distance pipeline ball valve: when the medium in the valve cavity stagnates abnormally due to temperature changes, the pressure of the medium will push the valve seat off the sphere to achieve the effect of automatic pressure relief, and the valve seat will automatically reset after the pressure relief. In case of fire or due to abnormal temperature to seat ring seal burning or softening, the valve operation is still reliable, while the valve seat and the ball to form a metal-to-metal contact to achieve a temporary seal to prevent further expansion of the fire, in line with APIFA Provisions. Unscrew the drain to check valve seat for leaks and drain the trap to reduce media contamination of the valve. In working condition, the valve is fully open or fully closed, replace the stem packing letter. In addition to the general seal seat, the special set of auxiliary seal structure, can play due to seal ring leakage when the emergency rescue role. Stem seal with PTFR packing and 0 ring, especially for gas medium. Stem movement parts using high-quality SF self-lubricating bearings, the friction system smaller, reducing operating torque.
July 06, 2024