Harm of oil pollution to hydraulic system

The quality of a hydraulic system not only depends on the rationality of the system design and the performance of the system components, but also because of the pollution protection and treatment of the system. The pollution of the system directly affects the reliability of the hydraulic system and the service life of the components. Statistics show that about 70% of hydraulic system failures at home and abroad are caused by pollution.
The hazards of folding oil pollution to the system are mainly as follows
1) Contamination and wear of components
Various pollutants in the oil cause various forms of wear of components, and solid particles enter the gap of the moving pair, causing cutting wear or fatigue wear on the surface of the parts. Erosive wear is caused by the impact of the solid particles in the high-velocity liquid flow on the surface of the element. The water in the oil and the products of oxidative deterioration of the oil have a corrosive effect on the components. In addition, air in the system's oil causes cavitation, which can cause erosion and damage to component surfaces.
2) Component blockage and clamping failure
Solid particles block the gaps and orifices of hydraulic valves, causing spool blocking and clamping, affecting working performance and even causing serious accidents.
3) Accelerates the deterioration of oil performance
The water and air in the oil are the main conditions for the oxidation of the oil with their thermal energy, and the metal particles in the oil play an important catalytic role in the oxidation of the oil. In addition, the water and suspended bubbles in the oil significantly reduce the motion pair. The strength of the oil film between them reduces the lubricating performance.
The types of pollutants
Pollutants are substances in the hydraulic system oil that are harmful to the system. They exist in different forms in the oil. According to their physical forms, they can be divided into: solid pollutants, liquid pollutants, and gaseous pollutants.
Solid pollutants can be divided into hard pollutants, including: diamond, cutting, silica sand, dust, wear metals and metal oxides; soft pollutants are: additives, water agglomerates, oil decomposition products and polymers and maintenance Cotton silk and fibers brought in.
Liquid contaminants are usually grooving oil, water, paint, chlorine and its halides that do not meet the system requirements. Usually, it is difficult for us to remove them. Therefore, when choosing hydraulic oil, we should choose hydraulic oil that meets system standards to avoid unnecessary failure.
Gaseous pollutants are mainly air mixed into Bladder Accumulator supplier the system.
These particles are often so small that they cannot settle out and become suspended in the oil, eventually being squeezed into the various valve gaps. For a reliable hydraulic system, the pair of these gaps achieve limited control, Importance and accuracy are extremely important.
The source of pollutants
The sources of pollutants in the system oil mainly include the following aspects:
1) Externally invaded pollutants: Externally invaded pollutants are mainly grit or dust in the atmosphere, which usually invade the system through the air holes of the fuel tank, the sealing shaft of the oil cylinder, the pump and the motor and other shafts. Mainly due to the use of the environment.

2) Internal pollutants: pollutants remaining in components during processing, assembly, debugging, packaging, storage, transportation and installation. Of course, these processes are unavoidable, but they can be minimized. Some special components are assembled and Debugging needs to be carried out in a clean room or clean bench environment. 3) Pollutants generated by the hydraulic system: particles generated by the wear of components during the operation of the system, sand particles falling off from castings, metal particles falling off from pumps, valves and joints, and rust and spalling in the pipeline. Particles and colloids produced by liquid oxidation and decomposition, and more serious is the large amount of impurities that the system pipelines have not been flushed before they are officially put into operation.