... 螺栓镦锻机 bolt former; 螺栓阀杆 threaded valve stem; 螺栓分布圆 bolt circle; ...
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Failure is more common with the screw put on the Bellows Seal Valves threaded stem wear, so that the valve can not close.
比较常见的故障是阀杆与螺套上的丝扣磨损，陶瓷阀门使阀门无法关闭。
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