1: EVD Smart Seal: The seal released exclusively by Hunger. Hydraulic cylinder seals wear and deformation through a special device to regulate the seals (elastomers) and internal pressure, automatically adjusts the amount of compression seal and restore sealing function. The structure can be used for very high reliability requirements of equipment (such as servo-hydraulic cylinders, hydraulic cylinders), the hydraulic system has been in large hydropower, offshore drilling platforms, removable seals are applied very complex situations. 2: SETCO AirShieldTM Seal: The integration of the new SETCOAirShieldTM friction spindle sealed with labyrinth seals sealed advantages. Compressed air tangentially into the cycle of fixed pre-groove bearing, and Spindle together constitute a closed maze. In the tank when the air flow around the spindle, similar to the vortex of the games produced uniform pressure, uniform air flow distribution. Combined with the flexible lip seal, leaking steam flow will be swept away dirt from the spindle bearings Department. 3: Active Flexible Control (ADC) auxiliary system: Recently, John Crane companies have proposed a pro-active flexible control (ADC) secondary seal, can be achieved with low load, compensation, reliable, has been successfully used in the compressor dry gas seal. In part to avoid a secondary seal for long-term storage or backup with the shaft / sleeve produced by adhesive, and adhesive performance degradation caused by open-end and other issues. The following features: (1) Back-shaped spring design; (2) does not require additional platen; (3) low friction, to meet the low-speed slide / spin-down requirements.