Headstock piece on media flows and forces open or closed to prevent backflow valve media called a non-return valve.
启闭件靠介质流动和力量自行开启或关闭，以防止介质倒流的阀门叫止回阀。
The sealing sections of non-return valve ball seat were separated, material was changed into zirconium oxide ceramic, 0.
通过分离单向阀球座密封段，材料改为氧化锆陶瓷，密封段流道直径增加0。
First: to act as an automatic non-return valve by preventing a backflow of steam from the main steam header to the boiler.
首先，能过作为一个自动逆止阀，防止蒸汽从主蒸汽加热器上倒流到锅炉里。
If this can not be avoided it is recommended to install either an simple thermostat close to the inlet which switches OFF the VOD or a non-return valve between the contact system and the VOD.
如果这个不能避免(的话)，这里建议在靠近入口处安装一简易恒温器来切断VOD，或在接触设备与VOD之间设置一逆止阀。
Method 1: Change into a new non-return valve; prolong the holding time, if there is still no melt cushion, it means the cylinder is broken.
方法一：换上新的止回阀，延长保压时间依然没有料垫，则说明料筒损坏。
Water pumps at the end of the relevant type of valve is also a non-return valve.
水泵吸水关的底阀也属于止回阀类。
Water pumps at the end of the relevant type of valve is also a non-return valve.
水泵吸水关的底阀也属于止回阀类。
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