R青铜丝口旋启式止回阀RF、F青铜丝口升降止回阀10FCO、16FCO、125FCO铸铁法兰旋启式上回阀150SRB、300SOB球墨铸铁法兰旋启式止回阀10FW铸铁对夹式止回阀20SW球墨铸铁对夹式止回阀UN不锈钢丝口升降式止回阀UO不锈钢丝口旋启式止回阀)