止回阀生产厂家上海石化高压阀门厂有限公司H44H/Y/W碳钢旋启式止回阀H41H/Y/W不锈钢升降式止回阀H42H/Y/W立式止回阀H44W/H/Y不锈钢旋启式止回阀H42H/W/Y不锈钢法兰立式止回阀H76H/Y/W对夹双瓣式蝶型止回阀HH47X微阻缓闭式蝶形止回阀H61H/Y锻钢焊接止回阀300X缓闭止回阀DHH44X/H-10/16型蝶式缓冲止回阀H71H/Y/W对夹升降式止回阀H42H/Y油田高压止回阀175H48Y(H)-200型空排止回阀H74H/Y/W对夹圆片式止回阀HC41X-10/16/25节能梭式止回阀HC44X橡胶瓣止回阀H72Y对夹式高压止回阀HQ45X微阻球形止回阀HC42X静音止回阀H71H/Y/W对夹升降式止回阀SH74Ⅰ型对夹薄型止回阀H41X/W-16P不锈钢消声止回阀H77H/Y/W对夹单瓣蝶型止回阀