Manifold block

Maintenance of Manifold block hydraulic valve

During the maintenance of Manifold block hydraulic valve, it is necessary to replace the seals. Only the seals qualified by strict inspection can be used selectively. For the disintegrated parts and valve bodies must be cleaned, and all backbutton grooves, holes, the bottom end of the thread can not have the presence of iron chips and dirt, for the thread with slight damage can use effective process means to restore, as far as possible to restore to the original size.


Manifold block hydraulic valve


For all the springs on the valve, as far as possible to avoid corrosion and rust spots, during the assembly of the valve, the need to cooperate and seal with grease, to avoid surface abrasion, while ensuring the flexibility of movement. Complete the assembly of the valve, whether there is no pressure or pressure, the operation force can not exist too big gap, appropriate control of the operation force, there must be no string leakage sound, friction and card.


With the extension of the service time of Manifold block hydraulic valve, the failure or failure is inevitable. The failure or failure of hydraulic valve is mainly caused by wear, cavitation and other factors such as too large fit clearance, hydraulic valve leakage and hydraulic valve spool action disorder or clamping caused by the deposition of hydraulic oil pollutants.


When the Manifold block hydraulic valve breaks down or fails, most of the hydraulic system functions are restored by replacing new components, and the failed hydraulic valve becomes waste. In fact, most of these hydraulic valves are still in good condition and can be restored to function with partial repair.


Manifold Block hydraulic oil pollution


Manifold block hydraulic oil is divided into three categories: air invaded in hydraulic oil, impurities mixed in oil and water mixed in oil, which also leads to pollution of hydraulic oil.


(1) The air invaded in Manifold Block hydraulic oil is as follows:


The intrusion of air is mainly caused by poor oil quality and poor sealing of pipe joints, hydraulic valves, hydraulic cylinders, hydraulic pumps and other reasons. When a large amount of air is invaded, a large number of bubbles will appear in the oil tank. At the same time, the hydraulic system will appear such faults as noise, Manifold block hydraulic components working instability, vibration, pressure fluctuation and movement disorder. In order to prevent air intrusion, the main method is to replace the bad seal in time, the need to often check the connection of pipe joints and hydraulic components and tighten the loose nut in time. After the air is mixed into the hydraulic system, the air should be removed by the exhaust device according to the correct operation method. At the same time, the filter net and other devices can be set in the oil tank to filter the bubbles.


(2) Impurities in Manifold block oil are as follows:


The oil is mixed with sand, chips, metal powder or because the sealing ring, accumulator skin is eroded by oil and oil deterioration, so that the oil produces colloidal substances and other impurities, resulting in the blockage of the gap, pump, valve and other hydraulic components in the moving parts of the dead, resulting in failure or seriously affect the performance of the system. The oil is mixed with impurities to accelerate the wear and tear of the components and reduce the life of the components. In order to prevent the mixing of impurities, the main method is to carefully clean the oil tank before filling oil. When filling the oil tank, the filter screen should be added. When the equipment is used, the oil tank should be covered tightly, and the deteriorated seals should be replaced in time, the filter should be cleaned in time and the oil should be changed regularly. When new equipment is installed, tubing must be pickled to remove impurities. If it is found that the oil impurity content is large, it can also be used after several times of filtration.


(3) The water mixed in the oil is:


The water contained in the oil will make the hydraulic components rust, wear and tear to produce failure. Possible causes of oil containing water are coolant entry from the tank cap, water cooler or heat exchanger leakage. At the bottom of the oil drum storing working oil, water and air with high humidity enter the oil tank through the air filter.


It is recommended that the manufacturer separate the oil route from the water route, so that the seal of the oil route is independent of the seal of the water route. In this way, even if the seal damage is leakage or oil leakage, it will not lead to the impact of oil and water mixing on the hydraulic system.

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Analysis of processing technology of Manifold Block hydraulic valve valve hole