Hydraulic oil (liquid) on the performance of the seal

Seal theory: in a dynamic and flexible seal between mating surfaces a layer of lubricating film intact. In the normal state, the lubricating film is the use of this layer to achieve the purpose of sealing and extending seal life.In the hydraulic system, the hydraulic oil (fluid) of the sealing performance of the sealing member in addition to media / sealing material compatibility, viscosity of the oil, the viscosity change with temperature, reciprocating (rotational) movement velocity, pressure, and the shaft, cylinder or the rod of material, hardness, geometry, surface finish, and the impact of the seal structure of the lubricating film and the film forming characteristics of the factors that affect the sealing effect. In general, to form a continuous lubricating film can achieve the desired sealing effect.Explain the seal of the sealing principle. That the seal (rotating dynamic seal) sealing machine, and sealing principle reason lubrication characteristics of two parts. Lubrication: oil seal friction characteristics are affected by the viscosity of the fluid and the sliding speed control, the relative sliding of the shaft seal surfaces separated lubrication oil film of moving, so keeping friction, wear small. Sealing principle: the sliding contact surface of the seal oil flow from the atmosphere side to the oil side and from the oil side to the atmosphere side of the loop. The sliding surface lubrication, prevent wear and tear, thus there is no leakage. When moving speed is too high, the impact of a continuous lubricating film formation, resulting in frictional heat increases  Hydraulic hose fittings temperature range beyond the seal material is caused by damage to the seal. Pressure is too large, in addition to affecting film formation, but also on the rubber seals have a "squeeze gap" effect, generally can be added, "ring" to improve. Or select a low coefficient of friction, good self-lubricating PTFE seals portfolio structure will help to improve the lubrication between the friction, suitable for high speed and high Depending on the system environment, working conditions and a reasonable selection of media seals and sealing materials, proper installation and maintenance of seals, is to obtain effective sealing effect, reliability and service life of the key.