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1.Remove the Model 7 from the line (union nut and adapter remain in the line).
从管道上拆卸型号7（接头螺母和适配器留在管道上）。收藏指正
2.Gravity ball check valves are converted to foot valves by replacing the union nut and end connector on the receiving end ? seat end ? of the body with an F.V. screen housing assembly.
重力球形止回阀可以变为底阀，只需在接受端口-阀体的阀座端口，用一个F.V.滤网壳组件更换管接头螺母和端口连接件即可。收藏指正
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