Sealing Shielding

Innovative Rod Seals Enhance Performance of Actuators in Aviation

Innovative Rod Seals Enhance Performance of Hydraulic and Electromechanical Actuators in Aviation  - Rod Seals LB und LS

Hydraulic sealing systems used in aviation technology applications are exposed to particularly challenging ambient influences such as extreme temperature fluctuations and aggressive pressure media. Major temperature fluctuations and aggressive media cause sealing materials to age faster than those used in conventional applications, resulting in impaired seal performance. Consequently, these application conditions and special mating surfaces require sealing systems that meet the required range of performance at high levels of reliability.

 

Rod seals for cylinders and actuators seal the applied system pressure toward the atmospheric side. They perform a critical function in preventing external leakage that may contaminate the immediate environment. The rod seals LB and LS have been specially developed for the safety-critical applications in aviation and offer high reliability and wear resistance due to their seal geometry and material selection.

 

Innovative Rod Seals Enhance Performance of Hydraulic and Electromechanical Actuators in Aviation - Aerospace image

Application examples:

  • Flight Control Systems

  • Propeller Engines

  • Landing Gear Systems

  • Aircraft doors

  • Engine Nacelles

 

 

 

LB rod seal for hydraulic actuators in aviation
(MIL-G-5514 / AS4716)

The LB rod seal is used when particularly high sealing performance and wear resistance are required and conventional compact seals do not satisfy the specific demands of the aviation industry. 

It consists of an NBR lip ring and a PTFE anti-extrusion ring. Among other things, it is characterized by exceptionally high static and dynamic sealing performance which is achieved by optimized seal geometry on the static and on the dynamic side of the seal. 

A back-up ring on the back of the seal provides improved extrusion resistance. When appropriate materials are selected, the LB rod seal is suitable for wide temperature ranges. If required, its wear resistance can also be further enhanced significantly by selecting suitable materials.

Innovative Rod Seals Enhance Performance of Hydraulic and Electromechanical Actuators in Aviation-Rod Seal LB - Parker Hannifin Advantages of the LB rod seal include:

  • Exceptionally high static and dynamic sealing performance.

  • Good wear resistance.

  • Robust seal profile for harshest operating conditions.

  • Insensitive to pressure peaks.

  • High extrusion resistance.

Range of application

  • Operating pressure             ≤ 350 bar

  • Operating temperature       -55 °C to +125 °C

  • Sliding speed                       ≤ 0,5 m/s

 

LS rod seal for hydraulic and electromechanical actuators in aviation
(MIL-G-5514 / AS4716)

The LS rod seal is particularly well-suited for high temperatures. It consists of a PTFE rod sealing ring, a PTFE anti-extrusion ring and an elastomer O-ring as a preloading element. Due to its wide variety of material combinations, it is characterized by a diverse range of applications – particularly in use with aggressive media and in wide temperature fields. The additional back-up ring at the back of the seal enhances extrusion resistance when pressure peaks occur and thus significantly increases the service life of the sealing system. The width of the back-up ring can be adjusted according to the groove so that in many cases there is no need for modification of an existing groove.

Innovative Rod Seals Enhance Performance of Hydraulic and Electromechanical Actuators in Aviation - Rod Seal LS with red  - Parker HannifinAdvantages of the LS rod seal include:

  • Exceptionally high static and dynamic sealing performance.

  • Good wear resistance.

  • Minimal break-away and dynamic friction and no stick-slip tendency ensures uniform motion even at low speeds.

  • Insensitive to pressure peaks.

  • High extrusion resistance.

  • Adaptable to nearly all media thanks to high chemical resistance of the sealing ring and large O-ring compound selection.

  • High temperature resistance in case of suitable compound selection.

Range of application

  • Operating pressure             ≤ 400 bar

  • Operating temperature       -55 °C to +200 °C

  • Sliding speed                     ≤ 4,0 m/s

 

Learn more in our brochure: Rod Seals for Hydraulic and Electromechanical Actuators in Aviation (MIL-G-5514 / AS4716)

 

 

Fabio BuetiSelim AlacaliThis blog post was contributed by Fabio Bueti, market unit manager aerospace, and Selim Alacali, application engineer aerospace, Engineered Materials Group Europe, Prädifa Technology Division

 

 

 

 

 

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