摘要：3）挡圈的选取应用。挡圈主要是用来弥补密封间隙的，当压力〉10MPa时使用，根据压力高低选择合适的挡圈材料和形式（按挡圈材料有聚四氟乙烯纯料、添加玻璃纤维或青铜粉或碳纤维的，还有硬度较大的丁晴橡胶；按挡圈形式分有弧形和矩形，切口和不切口的），
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