止回球阀 ball check valve ; Check-ball valve ; Shipbuilding
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进口止回球 intake check ball
球形止回阀 [机] ball check valve ; ball non-return valve ; ball and seat valve ; return valve
落球式止回阀 ball check valve
弹簧球式止回阀 spring ball check valve
止回阀球 pump check valve ball ; check-valve ball
回止球 check ball
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