Protection method for hydraulic seal of hydraulic system
Hydraulic seal hydraulic system hydraulic system leakage affects the safety of the system operation, the leakage of the seal has three forms: interface leakage, leakage and leakage of leakage, of which the former two are the main form.
Formation of oil liquid luxury, nearby environmental pollution, increase of machine downtime hour, reduce production rate, increase the cost of production and on the product formation fouling. Therefore, the leakage of the hydraulic system we must be controlled.
(1)Reasonable selection of materials
According to the material of hydraulic seal:
Hydraulic seals have a non-metal gasket, non-metal and metal combination gasket, metal gasket three categories,
The commonly used materials are rubber, leather, asbestos, paper, cork, PTFE, graphite, alloy steel, stainless steel, mild steel, copper, aluminum, and lead. The cotton, the sealing pad made of hemp, asbestos, paper, leather and other cellulose materials, its loose organization, poor density, there is a slight gap between fiber, it is easy to flow media soaked, in under the action of pressure flow medium from the high voltage side through these small cracks penetrate into the low pressure side, that is, the formation of infiltration leakage (about 1% of the total amount of leakage of 10% ~ 20%).
(2) Reduce the impact and vibration
In order to reduce the shock and vibration of the pipe joint loosening caused by the leak, you can use the following methods:

1.Use the shock absorber to fix all the tubes in order to absorb shock and vibration.

2.Use of low impact or accumulator to reduce impact.

3.Properly put pressure control valve to protect the system of all components.

4.Reduce the number of pipe joints, pipe joints as far as possible to use the welding joint.

5.Using straight thread joint, three way joint and elbow instead of taper pipe thread joint.

6.Try to use the oil return block instead of all piping.

7.With regard to the use of the maximum pressure, the use of the device when the bolt torque  and torque to prevent contact surfaces and seals were eroded.

8.Precision equipment pipe joint.

?3?Reduce the wear of the hydraulic seal

Most hydraulic seals are through accurate description, assumed dynamic seal parts processing qualified equipment accurately, with equity and can ensure the long hour relative hydraulic machine without leakage operation.Description of point of view, description can use the following method to extend dynamic seal life:

1.Eliminating the side load on the seal of the piston rod and the drive shaft.

2.With the dust ring, the protective cover and the rubber sleeve to protect the piston rod, prevent the abrasive, dust and other impurities into.

3.Describes the selection of suitable filtering equipment and easy to clean the oil tank to prevent dust accumulation in the oil hydraulic oil

4.Make the piston rod and shaft speed as low as possible.

?4?The need for hydrostatic seal

     Hydrostatic seals to prevent oil leakage between the rigid fixed surface.Fair description of sealing groove standards and tolerances, the equipment hydraulic seals to knead occur deformation to packing cooperation surface micro depressions, and the seal stress progress to higher than the sealed pressure.

?5?Selection of hydraulic seals

     For the requirements of the situation can not be used on the selection of experience, not suitable for replacement.But for those demanding situations, such as explosion pressure, high temperature of a combustible gas, corrosive medium flow, high flow speed and a certain pressure and temperature, such as pipelines, according to the working pressure, temperature, flow of corrosive medium and parts with surface state and shape selection.Generally speaking, under normal temperature and low pressure conditions, the use of non-metallic soft seal, medium and high temperature, the use of metal and non-metallic combination of metal sealing gasket or metal gasket;Under the conditions of temperature and pressure fluctuations, the flexible or self tight seal should be used. Under the condition of low temperature, corrosive medium or vacuum, the sealing gasket with special performance should be selected.