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。

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Control and examine: adopt microcomputer control system, electronic let-off, electronic weft selecting, automatic wefting, self-check, LCD ect.

控制与检测：采用微电脑控制系统，具有电子送经电子选纬，自动寻纬，故障检测，液晶显示等功能。

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Welding type high pressure check valve is generated by the pipeline flow of the medium itself force automatically turned on and off, is an automatic valve.

主要用于高压加压的天然气加气系统，防止加压天然气倒流的阀门。焊接式高压单向阀是靠管路中介质本身的流动产生的力而自动开启和关闭的，属于一种自动阀门。

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