Sealing system level design and application of the development depends on the ability of sealing products, mainly in three aspects.

    (1) rotary dynamic seal system

    Is still the current extensive use of common standard seal, the pressure required for the rotation can only provide the pressure seal for the l-3MPa the pressure-type oil seal, and the international advanced level of 10MPa. Acting hydraulic return oil seals used in construction machinery rotating seals have not yet been popular.

    (2) hydraulic cylinder reciprocating dynamic sealing systems

    Most China-made engineering machinery hydraulic cylinder seals still use the U-shaped design as the primary seal ring. The mid-90s design and production of engineering machinery hydraulic cylinder seals system, began to use coaxial U-shaped seal ring component and composite design. Widely used internationally in season 5 components (or 3 components) of hydraulic cylinder piston bearing rings combined sealing components, manufacturing process more complex, still remain in current domestic production of small quantities of the stage, the quality is less stable.

    (3) Static Seals Static Seals, although the abolition of the sealed asbestos and plant fiber products, but the polymer material the use of liquid seal is not yet universal. At present, these products are still used in the production of various types of Loctite Corporation sealant products. Domestic liquid sealant and piping for the hydraulic system connected to anaerobic brand less, and the coating process and quality performance are some gaps.
    Prospect: Medical research technique for sealing seals manufacturing industry will face from the mechanical and other engineering grumble, the high-pressure hydraulic machinery industry's critical issues

    With the international advanced technology and manufacturing technology introduction and post-2000 development trend of the national economy, U introduction of advanced technology based on China's construction machinery industry will have greater development. Hydraulic system operating pressure and system advanced, reliable work. @ The probe high. Will promote the design stresses and sealing components sealing system manufacturing technology development, and therefore, the Chinese seal and the seal of scientific research technology manufacturing industry will face in the construction machinery and other high-pressure hydraulic machinery industry's critical issues . Can be expected, when the industrial system in China will no longer seal is a high energy consumption, low efficiency, vast and complex structure of small-scale peasant-style business model, which is a highly intensive, large-scale, low-power, high efficiency, the operating system . By then, China will be the main varieties of seals 60% of the late 80s to meet international quality level of the early 90s, and the other 15% will have a variety of products to meet international seals of contemporary quality. China construction machinery and in the high-pressure hydraulic machinery design and application of sealing systems to reach the level of the mid-90s international technical standards.