Seal types for rotary equipment

The are four types of seals used on rotary equipment:
Angle seals – basic rotary seal design are a non-contact labyrinth type for use on medium to high leakage applications
Iris seals – flexible overlapping segments that provide a more positive seal for medium to low leakage applications
Flex seals – face contact seals for positive seal on low leakage applications
Bellow seals – positive face contact type of seal utilized on gas tight applications