通过组合所述止回阀的一外表面中的一周边槽与所述槽中的一螺旋缠绕芯来提供所述封垫。
The seal is provided by the combination of a peripheral groove in an outer surface of the check valve and a helically wound core in the groove.
600磅级：全封闭螺旋缠绕石墨填充不锈钢密封垫。
Class 300-600: Fully-encased spiral wound graphite-filled stainless steel gasket.
600磅级：全封闭螺旋缠绕石墨填充不锈钢密封垫。
Class 300-600: Fully-encased spiral wound graphite-filled stainless steel gasket.
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