磨阀橡皮头 valve grinding rubber
底阀橡皮圈 rubber face for valve
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阀球通常为软木或橡皮材质。
The valve balls are either cork or rubber.
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排除：清除杂物，更换已损坏的橡皮垫，改变阀片方向；
Excluded: debris removal, replacement of damaged rubber pad to change the direction of the valve;
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