Features: 1) Sanitary stainless steel butterfly valve 2) Material quality: SUS304, SUS316L 3) Flux domination of pipeline: DN 1) Sanitary stainless steel butterfly valve2) Material quality: SUS304, SUS316L3) Flux domination of pipeline: DN25-150 and 1" - 6"4) Standards: ISO, DIN, SMS, IDF We can offer the sanitary stainless steel valve as follows: 1) Butterfly valve: threaded butterfly valve, quick-installed butterfly valve,     welded butterfly valve, flange butterfly valve, threaded-welded butterfly     valve, flange-welded butterfly valve, extended welded butterfly     valve, pneumatic butterfly valve 2) Ball valve: quick-installed ball valve, without resort-liquid ball valve,     without dead angles ball valve, threaded three and ball valve, flange ball     valve (specialize in wine tank), 1pc with internal threaded ball valve,     2pc with internal threaded ball valve, 3pc with internal threaded ball valve3) Check valve: Welded check valve, threaded check valve, clamp type check     valve, movable check valve 4 ) Diaphragm valve: quick-installed diaphragm valve, triplet diaphragm valve,     U-type diaphragm valve5) Sample valves, stop reversing valves, forged stainless steel  valves, and     pipe fittingsOuter packing:As per customers' requests

check valve