以下为句子列表:
英文: Use Wto express seat facing ring material which process directly by valve body,when seat and discsealing material are different,use low hardness material symbol to express (except diaphragm valve).
中文: 注:由阀体直接加工阀座密封面材料用W表示,当阀座和阀瓣(闸板)密封材料不同时,用低硬试验材料代号(除隔膜阀外)。
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