... AISI304, AISI316L Technical parametersreversing valve(reverse flow valve,valve with manual overridel)Size: DN25-104and 1”~4”Standard:ISO, DIN ... , 3A,etcMaterial:AISI304, AISI316LConnection:welded, male, clamped,Working Principal:manual operation or driving device operationManual operation:handle,Pneumatic device:normally ... your special request. OEM is welcome too. Sanitary manual reversing valve (BLS)