止回球阀 ball check valve ; Check-ball valve

出口止回球 discharge check ball

进口止回球 intake check ball

球形止回阀 [机] ball check valve ; ball non-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 check-valve ball

回止球 check ball