Hydraulic valve is the most used components in the hydraulic transmission system, its function is to control or regulate the pressure, flow and flow direction of the working fluid, the starting and stopping of the executive element, speed and the ability to overcome the load control and regulation, so that the entire hydraulic system according to the requirements of coordinated work. When the hydraulic valve works abnormally, it will have a great impact on the stability, accuracy and reliability of the system, and even cause the system not to work at all. In this article, we will analyze the reasons for abnormal oil supply after the hydraulic valve pump and give specific treatment methods, hope you can help.
1. Failure phenomenon
Hydraulic valve as an important component, its performance directly affects the reliability and stability of the hydraulic system. In actual use, some people may have encountered this situation: change the hydraulic valve inlet flow found that the inlet flow failed to output with the normal response to the input control signal, given the input signal after the flow rate of no change or small changes, and even the phenomenon of steady state flow rate decline, accompanied by the product of imported fuel temperature rises rapidly over the poor and the pressure after the pump does not show. This means that the hydraulic valve may appear after the pump oil supply failure, this failure, do not panic, in order to check and repair the following hydraulic components.
2. Proportional flow control valve check
First, the proportional flow control valve should be checked. Product inlet flow through the system of proportional flow control valve for adjustment, proportional flow control valve spool opening with the input control signal according to a certain proportionality change, the input signal value increases the spool opening increases, the oil supply flow and pressure increases, proportional flow control valve failure will lead to the oil supply flow to follow the poor. Considering that the equipment is newly purchased, the product performance is relatively stable and reliable, and there are no spare parts to replace the verification, so exclude the possibility of failure of the proportional flow control valve.
3. Throttle check
When confirming that the proportional flow control valve is not faulty, the working condition of the throttle valve should be checked in time. This is because the fuel through the proportional flow control valve adjustment were supplied to the product and throttle valve, which throttle valve outlet fuel will return to the tank, turn off the throttle valve for test verification, the proportional flow control valve output flow to follow the performance of the improvement, but follow the poor and other faults still exists, so rule out the possibility of throttle valve failure.
4. Booster pump and relief valve inspection
When confirming that the proportional flow control valve is not faulty, should promptly check whether the booster pump and relief valve failure. When the booster pump failure, will lead to the actual oil supply is less than the theoretical value, and with the leakage gap or import and export pressure difference increases, the internal leakage loss increases, the oil supply decreases. If the value of the booster pump outlet pressure is beyond a reasonable range, according to the principle of booster pump outlet pressure adjustment, which is adjusted by the relief valve, then the reason for the increase in outlet pressure may be a failure of the relief valve or the working pressure adjustment is not in place. Counterclockwise rotation of the relief valve handwheel, the outlet pressure to the standard value, re-performance testing.
The hydraulic valves produced by Hanjiu are controlled by strict technical specifications and follow a series of requirements and norms. With high precision, high strength, low deformation advantages, the product is cost-effective. If you need, please contact us.
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