Types of groove for O-rings

Types of groove for O-rings compressed in radial direction

Types of groove for O-rings compressed in radial and axial direction

Dynamic seal

Static seal

Static seal

For fitting encapsulated O-rings (PTFE or FEP).

Provision must be made for a second seal to prevent the radially compressed encapsulated O-ring from being pressed out of the semi-closed groove when the pressure is reversed.

Split mechanical seal

The axial boundary faces must be chamfered to prevent pinching of the radially compressed O-ring when it is fitted.

For fitting radially compressed encapsulated O-rings (e.g. PTFE- or FEP-encapsulated elastomers)

Open rectangular groove

Dynamic seal

The radially compressed O-ring is also compressed axially by means of a spring-loaded thrust ring.

This additional compressive force can be intensified by chamfers.

Groove with axial boundary

in various components of the mechanical seal (e.g. the drive collar and seal face)

Types of groove for O-rings compressed in axial direction

Rectangular groove

Static seal

Self-closing effect 

Dynamic seal

The radially compressed O-ring remains tight even when pressure is reversed.

Static seal


Is used to hold the radially compressed O-ring tightly in the groove