A spring energized seal is a type of dynamic seal that uses a spring to provide a constant force against the sealing surface. The spring is typically made of stainless steel, alloys sometimes even PTFE and PEEK, and it is compressed between two components, such as a gland and shaft. As the components move relative to each other, the spring compresses and deforms, creating a dynamic seal that prevents leakage. The amount of force applied by the spring can be adjusted by changing its size or shape.

Mode of action

The behaviour of a spring energized seal follows the functional principle of an elastomer O-ring.

During installation, the seal is compressed and creates a pressure on the sealing surfaces primarily by the spring. As a rule, the higher the force of the spring, the higher the tightness. The actual system pressure increases the contact pressure and thus the sealing effect.

Depending on the required force application, different spring variants can be selected. They have different ratios between pressing stroke and the pressing load.

Deflectionpath

The gap behind the seal is decisive for the effect and the service life. This gap occurs primarily in radial seals or is necessary for design reasons. Since plastics tend to flow, this gap must be kept as small as possible to avoid extrusion into the gap. This phenomenon is significantly intensified with increasing pressure or temperature.

To counteract the cold flow, different arrangements of support rings made of pressure-resistant material are used.

Our technical department will be pleased to advise you on this.