Hydraulic oil for hydraulic drive system as a working medium, from the energy transfer, conversion and control role, while also playing the various components within the hydraulic system, lubrication, corrosion, rust and cooling effect. The seals in the hydraulic system plays a combination of surfaces to prevent leakage of fluid from, keep up the pressure, maintaining the role of energy transfer or conversion.
    Sealing material for use at home and abroad are mostly polymer elastomer, there are some special conditions, the use of plastic and various metals. But no matter what kind of material is, should have the following properties:
    1, with some mechanical and physical properties: such as tensile strength, elongation strength, elongation;
    2, a certain degree of flexibility, hardness, suitable, and the compression is small;
    3, with the working media to adapt, not prone to swelling, decomposition, hardening;
    4, wear and tear resistance properties to a certain extent;
    5, high temperature, low temperature aging.
    However, there is no sealing material, including the full performance, the 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 formula to meet certain requirements. Or two or more materials in the form of composite or composite structures play to their strengths, achieve more comprehensive results.
    Seal formation: dynamic seal into contact with non-contact seals and seal. Non-contact seals are mainly all kinds of mechanical seals, such as: graphite packing ring, floating ring seal, etc.; rubber compound seals and rubber seals belong to the combination of contact sealing, filling in the sealed chamber to rely on the pre-pressing force, seal leakage channel blocking effect obtained. Seals used in hydraulic systems are mostly static seal (seal), reciprocating dynamic seal (piston, piston rod seal) and rotating seals. ?
    Factors that affect the seal: seal structure choice and film formation, pressure, temperature, material compatibility, dynamic seal in contact with the work surface of the material, hardness, geometry, surface finish and so on.
    First, several medium-resistant sealing materials and their performance characteristics (abbreviated)
    1, NBR:
    2, silicone rubber:
    3, fluorine rubber:
    4, EPDM rubber:
    5, Teflon:
    6, polyurethane rubber:
    7, acrylate rubber:
Second, seal materials and hydraulic oil (liquid) compatibility
    Hydraulic oil is a source of particulate pollution, seal materials and hydraulic oil can not meet the resulting "scrap" or "debris." Seal for "Swelling" was damaged resulting "scrap" or "extraction" out of the combination of inorganic and not filling reinforcing material to seal damage and failure, while the pollution caused by hydraulic oil deterioration of the oil resulting in failure. ?
    Widely used in the hydraulic system pump, the pressure in their work status of more than 6.9MPa, the wear and tear issues become prominent, and therefore used in the hydraulic oil antiwear agent; order to meet the high-temperature heat and open flames in the hydraulic system, the use of The phosphate ester flame-resistant, water - ethylene glycol hydraulic fluid, oil in water and water in oil emulsion and so on. And should be "with" born antioxidant, rust and other types of configurations for different uses composite additive hydraulic oil (liquid) variety. Such as: anti-wear hydraulic oil compound type non-zinc type (ash-free type) anti-wear hydraulic oil compound is the use of hydrocarbon sulfide, phosphate, phosphite, etc., there are also sulfur, phosphorus and nitrogen SPN three elements of the extreme pressure antiwear agent. In the extreme pressure industrial gear oil, but also to PS-based extreme pressure agent-based.
Seals have a "swelling" or "extraction" because the hydraulic oil additives contained in the various chemical elements and their concentrations, based on "like dissolves like" principle, the different seal materials have different effects, but also both the dielectric properties of resistant sealing materials. For example: Shell Omala 320 gear oil, and Shell Omala 460 gear oil in the display Jixing of Lin (P) elemental concentrations Zai 300ppm Zuoyou, so Ding Jing Jing Ji propylene rubber Yinhan You have Jixing group and has excellent oil resistance, oil is not suitable for this type of media conditions. ?
    With the hydraulic oil (oil) varieties of continuous research and development, to improve the oil (liquid) properties of various anti-wear, extreme pressure additives, metal deactivation agent, emulsifier and anti-foam breaking additives, the material on the impact of seals need to verify by experiment.
    Third, the sealing material oil (liquid) Performance Test Evaluation
Rubber seal oil (liquid) performance, the general standard test oil, according to test standards for temperature conditions and under soak test time, through the comparison of test values before and after immersion (such as material hardness, tensile strength and rate of change, elongation rate of change, volume change rate, compression, etc.), evaluate its performance.
    No1 standard oil is "low volume increased oil", this mixture of mineral oil by solvent extraction composition, chemical treatment, dewaxing of paraffin oil residues and neutral;?
    No3 standard oil is a "high volume increased oil", from a selection of naphthenic crude products, after the two oil vacuum distillation composition. ?
    Different uses of the material index value assessment differently.
    Fourth, the hydraulic oil (liquid) on the impact of the performance of seals
    Sealed theory: In a dynamic and flexible seal with the surface layer between the integrity of the lubrication film. In the normal state, it is through this layer of lubrication film to achieve the sealing purposes and extend the seal life.
    In the hydraulic system, hydraulic oil (liquid) on the sealing properties of seals than media / sealing material compatibility, oil viscosity, viscosity changes with temperature, reciprocating (rotating) velocity, pressure, and shaft, cylinder or the piston rod of the material, hardness, geometry, surface finish, and seal the structure of lubricant film formation and film characteristics of the factors that affect the seal. In general, to form a continuous lubricating film can get a good seal.
Photovoltaic Equipment Co., Ltd. Jiangsu Grenada Buffett will play in the new energy that a key development. Photovoltaic equipment, seals, gear pad
Packing ring
Graphite ring
Rubber gasket
Non-asbestos rubber gasket
Asbestos rubber gasket
PTFE Envelope Gasket
PTFE gasket
Metal Jacketed Gasket
Metal gasket
Graphite composite pad
Spiral Wound Gasket
High purity graphite products
Graphite card flap
Graphite Block
Graphite cap
Photovoltaic Equipment Parts
Photovoltaic Equipment
Seal production
These products will be made such great progress in