重力球形止回阀可以变为通风阀，只需用漂浮球体更换标准球体，然后在安装时将阀门倒置，使其阀座向上即可。
Gravity ball check valves are converted to vent valves by replacing the standard ball with a floater ball and inverting the valve at installation-with seat up.
控制供应管道的水压。在总成的上游安装一个软阀座，弹簧负载止回阀。
Control supply line water pressure. install a soft seated spring loaded check valve upstream of the assembly.
每个止回阀应该都配置中心和边缘引导，确保可更换阀座密封和最小的局部磨损。
Each check valve shall be both center and edge-guided to ensure repeatable seating and minimize localized wear.
止回阀阀座应该是模制热塑塑料结构。
The check valve seats shall be of molded thermoplastic construction.
注：第一和第二止回阀模块的阀座和弹簧是不可互换的。较重的弹簧和较小直径的阀座属于第一止回阀模块。
Note: the seats and springs of the first and second check modules are not interchangeable. The heavier spring and smaller diameter seat belong with the first check module.
这种总成应该由两个正向密封止回阀， 两边夹着两个弹性阀座关闭阀， 并配置一个液压平衡旁路管线和四个测试旋塞构成。
The assembly shall consist of two positive seating check valves located between two resilient seated shutoffs with a hydraulically balanced bypass line and four test cocks .
止回阀的柔性阀座可使阀门安静地关闭。
A soft seat in the check valve will then assure a quiet closure.
止回阀的柔性阀座可使阀门安静地关闭。
A soft seat in the check valve will then assure a quiet closure.
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