Seat rings are long to compensate for temperature fluctuations and are seal-welded. Seating faces are hardfaced with Stellite 6, ground and lapped to mirror finish.
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- 阀座环较长,并且是密封焊接的,能够补偿温度波动。阀座面用钨铬钴合金6硬化,研磨和层叠为镜面光洁度。