??With the development of hydraulic seals become strong

??Hydraulic system hydraulic seal serves to prevent fluid from leaking between the joint surface, keep up the pressure and maintain energy transfer or conversion action.

??The factors affecting the sealing effect: selection and film sealing structure is formed, pressure, temperature, material compatibility, dynamic sealing contact with the working surface of the material, hardness, geometry, surface finish and so on.

??Hydraulic seals need to work environment, such as temperature, pressure, media and sport select the appropriate way to sealing materials, and through the development of materials with the recipe to meet certain requirements. Or in the form of a composite material or a combination of two or more structures play to their strengths, to achieve more comprehensive results.

??Hydraulic seals are generally of rubber material: nitrile rubber, silicone rubber, fluorine rubber, EPDM, PTFE, urethane rubber, acrylic ester rubber.

??To choose the material for hydraulic oil, because of debris or debris hydraulic seals material incompatible with the hydraulic oil will be produced. Hydraulic seals because these chips have not been extracted, the seal is damaged and fail, while the formation of oil pollution caused by hydraulic oil deterioration resulting in failure.

??With the continuous development of hydraulic oil (oil) varieties to improve a variety of anti-wear oil (liquid) performance, extreme pressure additives, metal deactivators, demulsifiers and anti-foam additives, etc. hydraulic sealing materials member of Effect need to verify experimentally.

??Hydraulic seals material oil (liquid) assessment of performance testing, generally using standard test oil, according to the test under conditions of temperature and soaking time trial standards, by comparing before and after immersion test values ??(such as changes in material hardness, tensile strength of the rate of change , ultimate elongation rate of change, volume change rate, compression set, etc.), to evaluate its performance.

??In the hydraulic system, (liquid) on the impact of hydraulic oil Hydraulic Seals properties in addition to media / sealing material compatibility, the viscosity of the oil, the viscosity change with temperature, reciprocating (rotational) velocity, pressure and shaft cylinder factors Affecting the body or the rod material, hardness, geometry, surface finish, and a sealing member forming a lubricating film structure and film characteristics, all affect the sealing effect. In general, to form a continuous lubricating film can get a good seal.

??Hydraulic seal friction characteristics by fluid viscosity and sliding speed dominated the relative sliding surface hydraulic seal and the shaft movement in the lubricating oil film separating the state, thus keeping small friction and low wear. Sealing principle: sliding contact surface of the oil flow from the hydraulic seal oil side air side to side and from the flow of oil circulating atmosphere side. Sliding surface oiled, prevent wear and tear, thus there are no leaks.

??The system of working conditions and a reasonable selection of the media environment of hydraulic seals and sealing materials, proper installation and maintenance of seals, is an effective sealing effect, the key to reliability and service life

??Due to the wide use of the seal structure in the form of a lot, so, by many of its peers, and kinds of structure type sealing device is still evolving. General requirements for hydraulic seal material is (1) dense, and not media leaks. (2) have appropriate mechanical strength and hardness. (3) in the working medium good chemical stability, working equipment hydraulic and lubricating oils have a certain tolerance, no swelling, no shrinkage, no softening, hardening. (4) good compressibility and resiliency, and permanent deformation, and even requires the ability to eliminate the gap caused by the piston or piston rod eccentricity. (5) ability to adapt to a certain temperature, not soften at high temperatures, does not decompose at low temperatures without hardening, non-brittle fracture. (6) good corrosion resistance, acid and alkali oil medium, long-term work, its small size and hardening change, and stick on a metal surface. (7) low coefficient of friction, good abrasion resistance. (8) in conjunction with the sealing surface softness and elasticity. (9) ozone resistance and aging resistance, and durability. (10) manufacturing convenient, cheap, easily drawn.