Open groove

The open groove structure is the most recommended groove form. The open groove structure is a separate two-piece design. The lip seal does not need to be stretched or twisted for assembly.(Fig:4-1)

Typical features:

The lip seal does not need to be stretched or twisted for assembly.

Lip seal can be disassembled and assembled repeatedly without causing damage to it.

Two-piece structure groove type may increase manufacturing costs.

Stepped groove

The stepped groove is a one-piece step design. The step is to keep the sealing ring in the groove. The height of the step is very small and no installation tools are required. The lip seal can be easily pushed into the groove. For piston sealing, Stepped groove is a good structure. Stepped grooves are not a good choice when there is back pressure. (Fig 4-2)

Closed groove

The closed groove is a one-piece integral design and is not recommended. It is only suitable for certain seal diameters, which requires stretching or compression to install the seal, and installation tools are needed, which may cause damage to the seal during removal. (Fig 4-3)

Groove for face seal

The face seal groove is the same as O-rings installation groove. Face seals are easy to be installed in this kind of groove. The groove wall of the pressure side is not a must. (Fig 4-4)