截止阀结构的止回阀应该用于水平管道，阀杆垂直朝上。
Globe pattern check valves should be used in horizontal pipe runs with the stem straight up.
尼伯科旋启式止回阀可配置外部操纵杆和压铁。操纵杆和压铁用于对阀瓣进行外部控制。
NIBCO swing check valves are available with an outside lever and weight. The lever and weight arrangement is used to maintain exterior control over disc movement.
双瓣止回阀主要由阀体、阀瓣、阀杆及弹簧等重要零件组成，并采用薄型轻巧设计。
Double disc check valve consists of body, disc, valve rod and spring and other parts. The valve is designed with slim light weight.
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