... closed,normally opened,opened and closed by two air flues separately8)Application:beer,food,brewery,berverage, ... ,chemical industry ,etc Name of productsstainless steel quick-install check valveNr.SHSD012MterialSS304,SS316,SS316LsizeDN25-150&1 ... ,SMS,DINManual operationPulling handle,multi-position handleconnectionwelded,thread,quick-install,flangeMOQ100pcsdelievey time15-30dayspayment 30%pay in advance ...