FlexiCase™ and FlexiLip™ PTFE Seals - Engineered Polymer Systems Division | Parker US
Inside of an industrial factory

Parker FlexiCase and FlexiLip PTFE seals are designed for rotary applications where elastomer lip seals fail, and mechanical seals are too costly. Versatility of design options make them suitable for a wide range of applications.

A Solution for Virtually Every Market

Since the FlexiSeal solves problems along several parameters, it is used in virtually every market.  Examples of extreme condition applications that involve lower speeds and higher pressures for which the rotary FlexiSeal is best suited include:

Bright blue motors
Motors
Extruders
Extruders
Cryogenics
Cryogenics
Yellow robotic arms working in a factory setting
Robotics
Gray valves connected to blue pipes
Valves
Spindle
Spindles

PTFE FlexiCase

FlexiCase designs feature PTFE lips that seal dynamically on a shaft and a metal case OD which creates a static, press-fit seal against the housing (bore).  Gaskets and spacers may be sandwiched between layers of sealing lips and/or the metal casing to eliminate potential leak paths. 

 

FlexiCase rotary shaft seals are manufactured from a wide variety of PTFE composites as well as machinable plastic materials. The PTFE sealing lips are generally not spring energized so the radial lip contact forces are comparably lower than rotary FlexiSeal profiles which are spring-energized.  Designs with garter springs are available for high run-out or abrasive media conditions.  Back-up washers on select profiles extend pressure capability.

PTFE FlexiLip

FlexiLip rotary seals feature an ID lip that seals dynamically on a shaft and an elastomeric O-ring on its OD to seal statically in a bore.  Since the lip is not spring energized, the radial lip contact forces are lower than a rotary FlexiSeal.

 

The seals are machined from a wide variety of PTFE composites and other machinable plastic materials. Standard O-ring options are fluorocarbon, silicone, nitrile and EPDM. This broad foundation of O-ring and PTFE materials can be tailored to suit nearly all applications. Standard and non-standard FlexiLip profiles are precision machined to fit inch-fractional and metric gland geometries. Standardized tooling and machining efficiencies make FlexiLip seals a cost-effective, high production solution. 

A Wide Range of Capabilities

  • Size Range: 
    • FlexiLip - 0.625 to 12"
    • FlexiCase - 0.235" to 6"
  • Speed: To1500 fpm depending on profile
     
  • Pressures:  To 10,000 psi depending on profile
  • Various OD configurations
    • Flanged OD where cavity permits
    • O-ring centered along OD
    • O-ring located in heel
  • Spring options:  
    • Cantilever (V-Series)
    • Canted Coil (C-Series)
  • Excellent fluid compatibility
  • Wide temperature range
  • Applications:
    • High temperatures
    • Poor lubrication
    • Harsh chemical environments
Parker Image

Can't find what you're looking for? Ask our experts.