A double
mechanical seal is a combination of two seals
mounted either back-to-back, or single seal
having sealing faces on both sides or tandem
type. These seals can be single-coiled or multi
springs type besides they can have a combination
of unbalance / unbalance, unbalance / balance
or balance / balance tandem types. These seals
are suitable for handling media which otherwise
cannot be handled by single seals. For cooling
the seal faces during operation, a clear compatible
liquid is circulated between two seals at a
higher pressure of one bar than the pumped liquid.
The internal seal prevents the liquid from entering
the circulation system while the external seal
prevents it from leaking to the environment. |
