采用斯特封组合密封件，液压缸几乎无内泄；
With the use of Sitefeng seals, the cylinder does not release nearly.
一种端面旋转高压方形截面组合密封件，属于端面密封件。
A combined seal piece of a high pressure square section with a rotary end surface belongs to an end surface seal piece.
一种端面旋转高压方形截面组合密封件，属于端面密封件。
A combined seal piece of a high pressure square section with a rotary end surface belongs to an end surface seal piece.
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