316衬PO不锈钢蝶阀材质：D71PO-10R/D371PO-10R/D671PO-10R/D971PO-10R/D71PO-16R/D371PO-16R/D671PO-16R/D971PO-16R/D41PO-10R/D341PO-10R/D641PO-10R/D941PO-10R/D41PO-16R/D341PO-16R/D641PO-16R/D941PO-16R，316L衬PO不锈钢蝶阀材质：D71PO-10RL/D371PO-10RL/D671PO-10RL/D...