H44H旋启式止回阀
H61锻钢自密封升降式止回阀
H1/61内螺纹与承插焊止回阀
H14W不锈钢内螺纹旋启式止回阀
H41H德标升降式止回阀
D373H对夹式硬密封蝶阀
H12W不锈钢内螺纹立式止回阀