Hydraulic valve hydraulic oil into the foreign particles and air what will happen

Oil mixed with various impurities in the oil particles in the form of solid-state pollutants exist. Some of these impurities are the components of the process of processing and assembly residual, some are generated during the hydraulic components in the course of work, and some from the outside world intrusion of impurities, the harm is: 1. Oil in a variety of particulate impurities will pump and motor caused harm. When the foreign particles into the hydraulic pump gear or gear motor gear end face and the two side cover cover, tooth top and housing, or when the impurity particles into the vane pump or vane motor blades and vane groove, rotor end and Between the oil pan, the stator and the rotor (the top of the blade), or when the foreign particles enter the plunger and plunger cylinder bore of the plunger pump or plunger motor, the rotor and the oil pan, the shoe and the swash plate, Between the sliding pair, are likely to cause stuck trouble. Even if it does not cause stuck problems, it will also aggravate the wear and tear. Impurities may also plug the oil inlet filter before the pump cavitation pump or cause a variety of concurrent failure. 2. Oil particles of various impurities will cause harm to the hydraulic cylinder. Particulate impurities can cause strain and wear on the piston and cylinder block, piston rod and cylinder head bore, and seal elements, increasing drain flow, reducing volumetric efficiency and effective thrust (pull), and if particulate contaminants get stuck on the piston or piston rod , Will lead to cylinder does not move. 3. Pollution of oil particles will cause a variety of hydraulic valve components. Contamination particles may cause the spool valve stuck or throttle 121 blockage, resulting in valve failure, even if there is no stuck or blocked failure, the particles will also cause valve components wear premature wear, with the gap increases, the performance deterioration. 4. Pollutants breed bacteria, exacerbate oil aging, the oil black and smelly, and further pollution. Such a vicious cycle, may have the following consequences: (1) clogging the oil filter, causing the pump suction empty, resulting in vibration and noise. (2) contaminants make the cylinder or motor friction increases, resulting in crawling. (3) contaminants make servo valves and other components with poor anti-pollution ability completely lost. (4) plugging the pressure gauge pollutants channel, so that the pressure can not be transmitted correctly and response. Intrusion of air into the oil The air in the oil comes mainly from loose fittings, imperfect element joints, tubing exposed to the oil surface, and seal failure areas. The oil also dissolves air when it is exposed to the atmosphere. In addition, when the amount of oil in the fuel tank is small, the circulation of the hydraulic oil is accelerated, making it difficult to eliminate the bubbles. Meanwhile, the oil pumping pipe of the oil pump is not deep enough to allow air to enter easily. The air mixed into the hydraulic system is usually suspended in the hydraulic oil in the state of bubbles having a diameter of 0.05-0.50 mm, which has a serious impact on the bulk modulus of the hydraulic oil in the hydraulic system and the viscosity of the hydraulic oil. As the pressure of the hydraulic system increases High, partially mixed with air-soluble hydraulic oil, the rest still in the gas phase. When the amount of mixed air increases, the volume elastic coefficient of hydraulic oil decreases sharply, the propagation velocity of pressure wave in hydraulic oil slows down, and the dynamic viscosity of oil increases linearly. The suspension of the air in the oil and hydraulic oil combined into a mixture, the stability of this oil depends on the size of the bubble, the hydraulic system, etc. have a significant impact, there may be vibration, noise, pressure fluctuations, hydraulic components Stable, moving parts produce creep, reversing impact, misalignment or misoperation and other failures, but also to increase power consumption, accelerated oxidation of oil and oil lubrication performance decreases.