俄罗斯采购需求：蝶阀、蝶阀配件、闸阀、止回阀、Y型过滤器、球阀

We are looking for a quotation for a resilient seated wafer butterfly valve suitable for seawater applications. The specifications include a size of DN450 (18 inch) and a pressure rating of PN10. The body material should be ductile iron with epoxy coating, and the disc should be made of aluminum bronze. Additionally, please provide options for the seat material, either EPDM or Viton/FKM as per our request. The stem can be SS431 or Monel, and the flange should comply with the ISO 5211 F16 standard. Please check your stock availability for this item, as we require a quick assembly and dispatch. Looking forward to your prompt response with pricing and lead times.