双吸密封环磨损过多，或叶轮损坏。
Too much wear with dual-suction seal ring or impeller damaged.
水泵淤塞，密封环磨损过多。
当石墨密封环磨损时，由于弹簧力及介质压力的作用下，旋转接头的壳体会往后面移动，使密封面得到有效的补偿。
During abrasion, under the spring force and the media pressure, the rotary joint will move reversely to make the sealing surface compensated effectively.
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