Sometimes, operating conditions are so harsh, ordinary secondary seals won’t do the job. That’s when it’s time to call in the big guns—Qualiseal® metal bellows seals. Qualiseal® offers metal bellows as a secondary sealing option for mechanical face seals. Providing exceptional sealing performance in highly toxic, corrosive, high temperature and/or high pressure environments, a metal bellows design can be the optimal solution to solve the most difficult sealing challenges. The bellows function as the secondary seal, as the spring to hold the primary seal against the mating ring, and as the anti-rotational lock. Only the most complex and demanding applications require the high performance and reliability of a bellows seal.