adj. non-return
此外，第一和第二止回模块是相同的，可以互换。
Also, the first and second check module are identical and can be interchanged.
可安装止回阀或订制自带止回功能的阀。
Can be installed or custom built non-return valve function of the valve.
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.
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