安装在阀门内的止回模块其阀座应该面对阀门进口。
Check modules are installed in the valve body with the seats facing the valve inlet.
该阀门有四个功能：流量测量、止回、再循环控制和多级降压。
The valve has the four functions of flow measure, flow checking, recirculating control and multistage pressure reducing.
本发明中的止回装置既可采用单向棘 爪棘齿式离合装置，也可以采用单向滚柱超越离合器。
The block device in the invention can adopt one-way pawl-ratchet type on-off devices and one-way roller overrunning clutches.
整个阀门无法在线检测，但是，每个止回模块部件编号SA7B 16可以按照下列方法单独进行检测。
Complete valve cannot be tested in the line, however, each check module Part no. SA7B16 can be tested individually as follows.
上部装置——有上部机壳、上罩、卸料口(装有防回料板)、头轴装配、逆止器等部件。
Upper device — includes parts of upper casing, top cover, discharge outlet (with anti back feed plate), head shaft and backstop.
上部装置——有上部机壳、上罩、卸料口(装有防回料板)、头轴装配、逆止器等部件。
Upper device — includes parts of upper casing, top cover, discharge outlet (with anti back feed plate), head shaft and backstop.
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