Basic information :
The Spring Energized PTFE Seal is a spring- energized, pressure-assisted sealing device consisting of a PTFE (or other polymer) seal partially encapsulating a corrosion-resistant metal spring energizer.
The PTFE jackets are precisely machined, filled with PTFE composites and other high performance polymers, function at temperatures ranging from cryogenic to 250 C and inert to almost all chemicals. Some types also can be used in sanitary environment.
Seals are available with a variety of spring energizers, each having characteristics to meet specific requirements. Spring loading can be adjusted to meet critical low or extremely high requirements in dynamic applications.
Section Structure
For Symmetric, for Rod, for Piston are available.
Material
Virgin PTFE, PTFE filled
Colour
blue,black,brown,white,green
Spring Style
U shaped spring(Type 400)
Round wire spring (Type APS)
O shaped spring (Type 103)
Groove
Standard Heel Groove.
Extended Heel Groove
Flanged Heel Groove.
Application:
Radial Seals in Static Service.
Radial Seals in Reciprocating Motion.
Inside face Seals in Static and rotary Service.
Outside face Seals in Static and rotary Service
Size
Both imperial and metric sizes are available on all styles. Customized service is always welcome.
They are chosen when higher resistance to chemical media is required, if the ptfe valve seals is required to operate in extremes of temperature and where good extrusion and compression characteristics are needed.
main design characteristics:
1. Application specific U-shaped seal profile
2. Spring geometry suited to the particular application
3. Proven high-performance ptfe valve seals polymers Standard products are available from 2 mm up to 2500 mm (8' 2") in diameter along with custom manufactured intermediate sizes, inch (imperial) sizes or special Geometries.
Performance :
The different types of PTFE valve seals combined with the properties of PTFE valve seals materials offer design engineers a wide range of solutions to a large number of applications.
The most important characteristics of PTFE valve seals are listed below:
Very low coefficient of friction
Good dynamic and static sealing
Capable of sealing at high speeds up to 15 m/s (49 ft/sec)
Almost universal chemical compatibility
Operating temperature of -253 °C up to +300 °C (423 °F to 572 °F)
Very good thermal resistance
Permanent elasticity unaffected by contact with chemicals
Good ageing characteristics
Low compression set
Capable of withstanding high pressures above 200MPa (2000 bar, 29000 psi) when using B ack-up Rings
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