My country's shale oil exploration and development has made important progress in many fields
Posted:2024-03-17
Hard seal butterfly valve refers to the "hard seal" with metal materials or other hard materials on both sides of the sealing pair. Hard seal of butterfly valve has poor sealing performance, but high temperature resistance, wear resistance and good mechanical performance. For example: steel+steel; Steel+copper; Steel+graphite; Steel+alloy steel; (The steel here may also be cast iron, cast steel, alloy steel, or surfacing and spraying alloy).