Common factors for low pressure in the hydraulic press system

The low pressure of the hydraulic press system may be caused by a variety of reasons. Here are some common factors:

Hydraulic pump failure

Pump wear: After the hydraulic pump is used for a long time, internal components such as plungers, cylinders, distribution plates, etc. will wear, resulting in a decrease in the volume efficiency of the pump and a decrease in the output flow, which will make the system pressure unable to be raised.

Pump drive problems: Failure of the drive motor of the hydraulic pump, slipping of the transmission belt or damage to the coupling will cause the pump to fail to operate normally or the speed is insufficient, which will affect the pump's output flow and pressure.

Fault of the relief valve

The set pressure of the relief valve is too low: The set pressure of the relief valve determines the maximum working pressure of the system. If the set value is too low, the system pressure cannot be raised to the required value.

The relief valve spool is stuck in the open position due to impurities, oil stains or other reasons, which will cause hydraulic oil to flow directly back to the oil tank through the relief valve, resulting in the system pressure not being established.

Hydraulic oil problem

Insufficient oil: The hydraulic oil level in the oil tank is too low, which will make it difficult for the hydraulic pump to absorb oil and suck in air, resulting in unstable system pressure and inability to reach normal pressure.

Oil contamination: The mixing of impurities, moisture or other pollutants into the oil will affect the normal operation of the hydraulic components, resulting in problems such as valve core stagnation and seal damage, which will affect the system pressure.

Pipe leak

Pipe rupture or loose joints: Pipes in hydraulic systems may break, age or loose joints after long-term use, resulting in hydraulic oil leakage. A large amount of leakage will cause the system to lose flow and the pressure cannot be increased.

Sealing damage: The seals of hydraulic cylinders, hydraulic pumps, valves and other components will cause increased internal leakage and reduce system pressure.

Hydraulic cylinder failure

Damage to piston seal: The seal on the hydraulic cylinder piston will be damaged, which will increase leakage in the hydraulic cylinder, and pressure oil leaks from the high-pressure chamber to the low-pressure chamber, causing insufficient output force of the hydraulic cylinder and unable to increase the system pressure.

Wear of hydraulic cylinder inner bore: Wear of hydraulic cylinder inner bore will increase the fitting gap between the piston and the cylinder, causing an increase in internal leakage and affecting the system pressure.

Other factors

Poor heat dissipation of the system: If the oil press that runs for a long time is poorly dissipated, the temperature of the hydraulic oil will increase and the viscosity of the oil will decrease, resulting in increased leakage and decreased system pressure.

Load too small: If the load the hydraulic press bears is too small, the system pressure will be relatively low. This is because the pressure of the hydraulic system is automatically adjusted according to the load. When the load is small, the system pressure will be reduced accordingly to match the load.