... , DIN, 3A,etc Material:AISI304, AISI316L Technical parametersreversing valve(reverse flow valve,reversal valve)Size: DN25-104and 1”~4”Standard:ISO, DIN, ... ,Working Principal:manual operation or driving device operationManual operation:handle,Pneumatic device:normally closed, normally opened, opened and closed by ... to your special request. OEM is welcome too. Sanitary pneumatic reversing valve (BLS)