Back-up rings are washer-like devices that are used to prevent a seal from extruding through any gaps while under pressure.

备份环形状类似垫圈，用途为防止密封件遭到挤压。

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Back-up rings are washer-like devices that are used to prevent a seal from extruding through any gaps while under pressure.

备份环形状类似垫圈，用途为防止密封件遭到挤压。

youdao