Spring Energized Seal consists of two components, a polymer-based seal jacket and the spring. Jackets are typically made from different PTFE material blends, which have low friction, high and low-temperature range, and broad chemical and media compatibility.

The seal jacket is typically machined in the shape of a “U”. Installed with the open side of the “U” facing the system pressure.This is for the pressure actually energizes the seal to improve sealability. The force from the pressure will expand the seal lips driving them into the hardware sealing surfaces. The higher the pressure is, the more force is applied and therefore the greater the sealing potential.

The spring will be responsible for providing the primary sealing energy at low pressures and start-up conditions. The necessity of a spring inside the seal jacket is due to the material nature of PTFE. PTFE possesses very little memory or ability to rebound,and also will not bounce back when a force is applied. So,PTFE jacket will require a spring energizer to ensure the lips are firmly contacting the hardware in all pressure scenarios.

Differences between springs of different shapes:

V spring also called Cantilever spring: small deformation elasticity, stable elasticity.

Suitable for medium pressure.

It is easy to adapt to a small deviation of groove size in static state.

The sealing speed of rotating shaft can reach 8m / s.

H spring also called Helical spring: with large deformation and elasticity.

Suitable for medium and high pressure environment.

The force of each coil of spring is uniform.

C spring also called Canted coil spring：deformation, elastic instability.

Suitable for low pressure environment.

It is suitable for places sensitive to sealing pressure.

A PTFE spring energized seal offers the greatest temperature range possible for a seal. They can be used in cryogenic applications approaching -196℃.

With a PTFE and stainless-steel spring, chemical compatibility is also maximized. Applications with caustic or aggressive media may not be able to use any type of elastomer.

Even in applications with benign media and temperatures, spring seals can still offer an advantage. In rotary applications, A rotary seal using a canted coil will outperform an energize a PTFE jacket with an O-Ring in terms of friction, consistency, and wear-life. Spring energized seal can do the job no other seal can.