How to troubleshoot a sequential valve failure in a Dongguan hydraulic press
Release time:
2023-01-03
How to troubleshoot Dongguan hydraulic press sequential valve failure During the use of Dongguan hydraulic press, the main failure of the sequential valve is the failure caused by the failure of sequential control. So how to eliminate the failure of the sequential valve? The following analyzes the troubleshooting of the hydraulic press sequential valve not working.
1. If the pressure in the inlet and outlet chambers is the same, one reason is that the damping hole on the valve core of the Dongguan hydraulic press is blocked, so that the leakage oil of the control piston cannot enter the pressure regulating spring chamber and return to the oil tank. Over time, the pressure in the oil inlet chamber is transmitted to the lower chamber of the valve through the leaking oil, acting on the lower end face of the valve core. Because the area of the lower end of the valve core is much larger than the area of the control piston, the valve core is fully opened under the action of oil pressure, and the valve becomes a normally open valve. Therefore, the pressure in the oil inlet chamber and the oil outlet chamber will rise or fall at the same time. In addition, when the valve of the Dongguan hydraulic press is in the fully open position, the valve core will be stuck, which will also cause the above phenomenon.
2. The reason why there is no flow in the oil outlet chamber is that the oil outlet is installed in the form of internal return oil, so that the oil pressure in the pressure regulating spring chamber is equal to the oil pressure in the oil outlet chamber. Because the area of the upper end of the valve core of the Dongguan hydraulic press is larger than the area of the control piston, the valve core closes the valve under the action of hydraulic pressure, and the sequential valve becomes a normally closed valve. There is no flow in the oil outlet chamber. In addition, when the valve core is stuck in the valve closing position, there will be no flow in the oil outlet chamber. When the damping hole on the end cover is blocked, the control oil cannot enter the control piston chamber of the Dongguan hydraulic press, and the valve core closes the valve under the action of the pressure regulating spring, and there is no flow in the oil outlet chamber.
Why can't the Dongguan hydraulic press pressure come up? ?
In practice, there are many reasons why the Dongguan hydraulic press pressure cannot work.
However, we can start from the following aspects:
1. Common sense operational errors of the Dongguan hydraulic press, such as the three-phase power is reversed, there is not enough oil in the oil tank, and the pressure regulating valve is not adjusted large enough. This kind of error usually occurs when beginners first use the printing press.
2. The power of the Dongguan hydraulic press is insufficient, which generally occurs in old machines, either due to pump wear or motor aging. Put your hand on the oil inlet pipe and see if the machine has a large suction force when pressing. If so, the pump is fine; otherwise, there will be a problem; motor aging is rare, it is really loud, because it cannot bring such a large force.
3. Oil leakage of the Dongguan hydraulic press, first check whether there are obvious oil leakage signs on the surface of the machine; otherwise, the piston oil seal will be damaged. This should be put aside for now, because unless there is no other way, the cylinder will be disassembled and the oil seal will be replaced.
4. The hydraulic valve of the Dongguan hydraulic press is broken, the valve is blocked, and the internal spring is stuck by impurities and cannot be reset, which will cause the pressure to not come up. If it is a manual reversing valve, just remove it and wash it.
The above are the methods for troubleshooting the sequential valve of the Dongguan hydraulic press. Do you all understand? If you want to learn more, please feel free to contact us. Thank you for watching, and see you next time.
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