▁A ▁formed ▁or ▁w eld ed ▁metal ▁bell ows ▁can ▁also ▁act ▁as ▁the ▁spring . ▁ ▁Cor ros ion , ▁c logging ▁and ▁movement ▁are ▁major ▁consider ations ▁when ▁selecting ▁a ▁spring ▁design . ▁ ▁Hard ware ▁▁▁ ▁In ▁addition ▁to ▁retain ing ▁the ▁other ▁components , ▁the ▁se al ▁hardware ▁includes ▁the ▁drive ▁mechanism ▁which ▁is ▁necessary ▁to ▁prevent ▁ax ial ▁and ▁rot ational ▁sli pp age ▁of ▁the ▁se al ▁on ▁the ▁sh aft . ▁ ▁The ▁drive ▁mechanism ▁must ▁with stand ▁the ▁tor que ▁produced ▁by ▁the ▁se al ▁faces ▁while ▁also ▁allowing ▁the ▁se al ▁ring ▁to ▁move ▁ax ial ly . ▁ ▁In ▁addition ▁to ▁tor que , ▁the ▁drive ▁mechanism ▁must ▁with stand ▁the ▁ax ial ▁thrust ▁produced ▁by ▁hydro static ▁pressure ▁acting ▁on ▁the ▁components . ▁The ▁various ▁types ▁of ▁drive ▁mechan isms ▁include : ▁ ▁dent ▁drive , ▁key ▁drive , ▁set ▁sc rew s , ▁p ins , ▁sl ots , ▁snap ▁rings ▁and ▁many ▁more . ▁ ▁Typ ically , ▁the ▁retain er ▁for ▁the ▁se al ▁ring ▁might ▁include ▁set ▁sc rew s , ▁a ▁dent ▁or ▁slot ▁drive , ▁re cess es ▁for ▁the ▁spring ▁and ▁a ▁snap ▁ring ▁to ▁complete ▁the ▁assembly . ▁ ▁In ▁contrast , ▁m ating ▁ring ▁hardware ▁might ▁be ▁only ▁a ▁pin ▁or ▁slot ▁to ▁prevent ▁rotation . ▁Cor ros ion ▁is ▁a ▁major ▁consideration ▁when ▁selecting ▁se al ▁hardware . ▁ ▁Consider ations ▁for ▁secondary ▁se aling ▁elements ▁ ▁Both ▁the ▁se al ▁ring