旋启式止回阀H44H
消声止回阀H41X
微阻缓闭止回阀HH44X
微阻缓闭蝶式止回阀HH49X
升降式止回阀H41H
立式止回阀H42W
静音止回阀H42X
对夹升降式止回阀H71H
蝶式缓冲止回阀HH47X
铸钢闸阀
