What is the reason for the failure of the hydraulic reversing valve?
Speaking of the failure of the hydraulic change-over valve, it is one of the faults that many users encounter. When we encounter this failure, we need to find the cause to solve it. What is the cause? Let's take a look!
1. Improper use of hydraulic change-over valve, such as damage to piston rod sealing ring or aging of sealing ring, will result in this failure. Only proper replacement of corresponding parts can solve these problems.
2. Incorrect parameter selection in adjustment procedure or failure to notice error values during construction are likely to cause such accidents. Therefore, we should carefully observe and check relevant instructions for detailed understanding before operation to find out the correct position for operation to avoid other influences.
3. Misconnection of Hydraulic System, such as confusion of related branches and main circuits, and repetitive wiring are also very likely to cause faults, so it is necessary to minimize the occurrence of this condition.
From the above we can know the cause of hydraulic change-over valve failure, then we can better solve the valve failure, hope to be helpful to everyone.
Hydraulic valve failure will have a tremendous impact on the whole hydraulic system. Starting from the centralized common phenomena of hydraulic valve failure, this paper briefly summarizes the causes of hydraulic valve failure, hoping to provide you with some reference.
I. Mechanical failure!
(1) Wear: Friction between moving pairs of mechanical parts, such as hydraulic valve spool, valve sleeve and valve body, occurs continuously during use, which makes the size, shape and surface quality of parts change and become invalid.
(2) Fatigue: When working under long-term variable load, the spring in the hydraulic valve will become soft, the spring length will be shortened or the whole spring will break due to fatigue. Spool and seat can also be cracked, flaked or otherwise damaged due to fatigue. These can all cause the valve to fail.
(3) Deformation: When the residual stress in the process of machining and the external load stress in the process of using exceed the yield strength of the part material, the part deforms and fails to fulfill the normal function.
(4) Corrosion: Hydraulic oil mixed with too much water or acid will corrode related parts of hydraulic valve after a long time of use, so that it loses its due accuracy and fails.
2. Hydraulic clamping: When the pressure oil flows through the cylindrical spool valve structure of the hydraulic valve, the radial unbalanced force acting on the spool causes the spool to jam, which is called hydraulic clamping.
3. Hydraulic shock: Hydraulic shock occurs when the fluid flowing in the hydraulic system suddenly changes direction or stops flowing due to rapid reversal or closing of oil duct, which causes the pressure to rise sharply and forms a great pressure peak value, i.e. hydraulic shock.
4. Cavitation Phenomena
In a hydraulic system, air bubbles are called "cavitations" due to pressure drop caused by changes in fluid flow rate. Cavitation and cavitation worsen the working performance and reduce the reliability of the hydraulic system.
In conclusion, besides the manufacturing factors, the mechanical failure of hydraulic valves is mainly related to management, so do not wait until the hydraulic system can not work properly. Dalan Hydraulic reminds you that in ordinary times, more pre-judgment and pre-treatment are needed to eliminate the equipment failure caused by valve failure in the budding state.
