有些类型止回阀配置弹簧驱动，能够在流动停止时，立即关闭阀门。
Some styles are spring-actuated for immediate closure when flow stops.
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。
Swing-type check off er the least pressure drop and offer simple automatic closure; when fluid flow stops gravity and flow reversal closes valve.
停止流动的河流会变臭。
应用推荐