When the control valve at the end of center pipe was widely open, the pipe failure was mainly caused by high-temperature oxidation.
当中心管末端调节阀开大时，中心管损坏原因主要为高温氧化；
But this time there is a stop block valve to prevent valve flap over top dead center and open.
而这时阀内有一个停止块来防止阀瓣超过上死点而打开。
But this time there is a stop block valve to prevent valve flap over top dead center and open.
而这时阀内有一个停止块来防止阀瓣超过上死点而打开。
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