The sealing ring is a ring with a gap seal, placed it in the ring groove in the sleeve, the sleeve rotates with the shaft, the sealing ring is pressed by gap long after the elasticity is pressed against the inner hole wall of the stationary member, can play a role in sealing. All contact surfaces must be hardened and polished. The sealing ring is made of chromium containing wear resistant cast iron, which can be used for sliding speed less than 100m/s; if the sliding speed is within the range of 60 ~ 80m/s, tin bronze can also be used to make the sealing ring.
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