In BV-2 seal design springs are not emerged in operating fluid. In that manner spring blocking and material incompatibility problems are eliminated. In
Mechanical seal metal part incompatibility to media is common problem when sealing aggressive, corrosive media. Mechanical seal type CHEM NM-3 with no metal parts
Mechancial seal type CHEM NM-4 is mostly used in processing aggressive media. Mechanical seal is independent of direction of rotation. Secondary seal depend on
Simple mechanical seal for water pumps. Single spring configuration. Unbalanced. Dependant on shaft rotation direction. Face materials: carbon-graphite Cr-steel Cr-Ni