Editing time: February 7, 2023 Author:
The most common cause of hydraulic press overheating is improper adjustment. This is the first thing we need to find for devices that usually do not overheat. The pump compensator is the most common unbalanced component. The compensator must be installed below the equipment safety valve. But for whatever reason, the system operates better under higher pressure.
Then the setting of the hydraulic press compensator was increased, but the setting of the safety valve was not increased. Once the compensator is set close to the safety valve, the safety valve will begin to open and flow oil into the tank. The more compensators are set, the more safety valves open, and the greater the flow back to the fuel tank. The pressure compensation pump moves to the entire stroke, acting as a fixed displacement pump, rather than changing its flow rate to meet the needs of system design. Any flow that is not used for moving loads will be returned to the fuel tank through a safety valve. When the equipment is idling, all pump flow returns to the fuel tank. Due to the ineffective pressure drop, most of the energy entering the system is converted into heat.
Changing system pressure is usually a bad idea. Most hydraulic presses have designer recommendations for system pressure and consider many design standards to determine the optimal system pressure. Generally speaking, increasing pressure is to accelerate the machine, but it is a very inefficient way to achieve this goal. The flow rate determines the speed of the actuator, not the system pressure. Yes, increasing pressure usually increases flow, but a more effective method is to turn on flow control or increase manual volume adjustment. It is generally recommended to install a system safety valve of around 250PSI above the pump compensator, without the designer's suggestion.