New polyurethane U-shaped rubber seals

 

• asymmetrical cross section, the shorter lip

 

• sealing lip machined, high dimensional accuracy

 

• optimum preload (lip radial confining force]

 

• sealing the sliding surface wavy

 

• Friction force is low, no crawling and tremble at work

 

• good hydrodynamic function reflux

 

• Anti-extrusion capability gap

 

• Good static and dynamic sealing performance

 

• Install cavity accord ISO5597 (or GB2879) requirements

 

• both alone as the primary seal can also be used as a secondary seal in dense systems.

 

Called to explore different sections of the U-shaped structure of polyurethane rubber seal friction characteristics when the hydraulic cylinder pressure states to launch the trip, LF300 minimum friction, U-shaped rubber seals NI300 friction double lip seal in second while T20U shaped rubber ring friction maximum. The relation between the pressure and friction between the sealing pressure by repeated rounds of tests. Especially when the pressure Friction force 40 ~ 150MPa LF300 range is significantly lower than other structural forms of the U-shaped rubber seals.

 

Sealing performance LF300 rubber seals (mainly refers to the amount of leakage) and other structures in the form of U-shaped ring is roughly equal.

 

LF300 rubber seal service life and other structures in the form of a U-shaped rubber ring is roughly equal. Under the same experimental conditions the life comparative tests can be divided into two phases. The first stage: p = 200MPa, v = 0.25m / s, T = 80 ? ± 3 ?, total stroke L = 200km, test time is 220h. The second stage: p = 32MPa, v = 0.25m / s, T = 110 ? ± 3 ?, total stroke L = 60km, test duration 50h.

 

After nearly 272h test, the following conclusions: LF300, T20 and MI300 seals have excellent wear resistance and high sealing reliability and service life. That is: After the sealing test fully functional, low leakage, low wear, small changes in preload lip.