对夹蝶式止回阀 wafer butterfly check valve H77X-16

内螺纹旋启式止回阀 female screw swing check valve H14W-16

内螺纹立式止回阀 female screw vertical check valve H12W-16

铸钢法兰旋启式止回阀 c.s flange swing check valve H44H-16/25

不锈钢法兰旋启式止回阀 s.s flange swing check valve H44H-16/25