U Cup Seal Design

Loaded u seals or u cups sometimes called polypaks are loaded with an o ring or sometimes a quad ring between the two lips to increase the sealing force at low pressures.

U cup seal design.

Hydraulic sealing solutions for fluid power applications have become a priority in our continued product offering. Parker s 8400 profile u cup is a light load symmetrical lip seal for use in either rod or piston sealing applications. The fourth part of the numbering system identifies the specific seal design configuration required. Interference fit in the groove.

O ring loaded u cup seals also known as loaded lip seals and polypaks an o ring secures these u cups to the rod or piston for better sealing performance at lower pressures than unsupported u cup seals. This insures a tight fit in the groove to prevent movement of the seal during. Rated for pressure up to 10 000 psi these leather u cups handle over 80 times more pressure than our buna n u cups. Many different u cup configurations exist to properly seal that demanding application.

The spring loads the seal s lips against the mating hardware creating a seal capable of compensating for movement in dynamic applications. U cup has an od. U cup is a specialized rod seal design developed from the standard symmetrical u cup. The design configurations are identified as follows.

It assures improved sealing performance due to the following features. Fluid power seals sizes readily available in a multitude of materials to provide optimal compatibility with the various hydraulic fluids encountered in service. Rated for pressure up to 10 000 psi these leather u cups handle over 80 times more pressure than our buna n u cups. The thin flexible lip design reacts to low pressure and provides an extremely smooth steady movement with less break away force required because of the inherent low friction.

The following are part number examples of the various o ring loaded u cup design types which have the same inside and width values but differing depths. The unloaded urethane u cup design provides an excellent heavy duty seal for both piston or rod applications and works well in static and dynamic applications. O ring loaded u cup seals also known as loaded lip seals and polypaks an o ring secures these u cups to the rod or piston for better sealing performance at lower pressures than unsupported u cup seals. Mfp offers a wide range of u cup designs and produces them from a broad range of materials.

The unloaded urethane u cup is commonly known as a disogrin u cup. U cup seals or u ring seals are commonly used in linear applications to seal the rod or piston. Spring energized u cups spring energized u cups are engineered plastic seals that incorporate a metallic spring. Homogenous u cups homogenous u cups are popular in low pressure applications where a low friction seal would be beneficial.

U cups seals symmetrical design.