Swing-type check off er the least pressure drop and offer simple automatic closure; when fluid flow stops gravity and flow reversal closes valve.
旋启式止回阀压降最小，能够完全自动关闭，即在介质流动停止、重力和介质倒流的状态下自动关闭阀门。
Reversal point method which is adopted by gyroscope to seek north at present reduces the speed of north-seeking and is hard to make the instrument automatic.
目前陀螺初寻北大多还是采用逆转点法，影响寻北速度且难以实现仪器自动化。
Reversal point method which is adopted by gyroscope to seek north at present reduces the speed of north-seeking and is hard to make the instrument automatic.
目前陀螺初寻北大多还是采用逆转点法，影响寻北速度且难以实现仪器自动化。
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