CNZH SUPPLIES HIGH-QUALITY SANITARY VALVES Check valve NRV none return valve Application: pipeline system Dairy, winery, food industery, pharmaceutical etc Type: Weld,clamp,thread, Standard: DIN ISO SMS RJT Material: SUS304, SUS316L DIN:15~100 SMS 25~102 ISO IDF : 1"~4" RJT: 1"~4