Specific application of direct acting relief valve in hydraulic system

Direct Acting Relief Valve plays a vital role in hydraulic system and is a key component to ensure safe operation of the system and avoid pressure overload. The following will introduce in detail the specific application, working principle and contribution of direct acting relief valve in hydraulic system.

1. Working principle of direct acting relief valve
In hydraulic system, direct acting relief valve is used to control the maximum pressure of the system, ensure that the system can quickly release excess pressure under overpressure, and protect equipment and system components from damage. Its working principle is that when the pressure in the hydraulic system exceeds the set safety value, the relief valve will automatically open, allowing the hydraulic oil to be discharged through the valve to the oil tank or return oil pipeline, thereby reducing the pressure in the system. When the pressure returns to below the safety value, the valve automatically closes and the hydraulic oil continues to flow normally.
The main components of the relief valve include valve body, spring, valve core and valve seat. During the operation of the hydraulic system, the pressure of the hydraulic oil acts on the valve core. When the pressure exceeds the preset pressure of the spring, the valve core is pushed open and the hydraulic oil flows out through the pressure relief port. As the system pressure decreases, the spring force presses the valve core back to the valve seat and the valve closes.

2. Specific application of direct-acting pressure relief valve in hydraulic system
System pressure protection: In hydraulic system, excessive pressure can cause damage to oil pumps, hydraulic cylinders and pipelines, and even cause system failure. As a safety protection device for hydraulic system, direct-acting pressure relief valve can respond to pressure changes in time. When the system pressure exceeds the set value, the valve will open quickly to prevent the pressure from continuing to rise. Therefore, the pressure relief valve can effectively protect the key components in the system and extend the service life of the equipment.
Overflow control: In hydraulic system, overflow control is an important means to ensure that hydraulic oil can maintain a stable flow under different working pressures. When the load in the system changes, the direct-acting pressure relief valve can maintain the flow balance of hydraulic oil by releasing pressure, ensuring that actuators such as hydraulic cylinders and hydraulic motors can operate smoothly. Under working conditions where full flow is not required, the pressure relief valve can also reduce the energy consumption of the system and improve work efficiency through the overflow function.
Overload protection of hydraulic pump: The hydraulic pump is one of the core components of the hydraulic system, and the direct-acting pressure relief valve plays a key role in the overload protection of the hydraulic pump. When the system load is too high or the pressure rises instantly due to operating errors, the pressure relief valve can quickly release the pressure to prevent the hydraulic pump from being damaged by overpressure. Especially under heavy-load operation or intermittent load conditions, the response speed and precise control of the pressure relief valve are crucial to the safety of the hydraulic pump.
Protection during system startup and shutdown: When the hydraulic system is started and shut down, it is easy to have instantaneous high pressure. The direct-acting pressure relief valve can play a protective role in these instantaneous overpressure conditions. When starting, the pressure relief valve can allow part of the hydraulic oil to be discharged through overflow before the system pressure reaches the normal working range to prevent excessive pressure shock in the system. Similarly, when shutting down, the pressure relief valve can help the system transition smoothly during the gradual decrease of pressure to avoid hydraulic shock.
As a safety valve for hydraulic systems: The pressure relief valve can also be used as a safety valve in hydraulic systems. When other control valves in the hydraulic circuit fail or are misoperated, the pressure relief valve, as the last line of defense, can ensure that the system does not cause equipment damage or casualties due to pressure loss. Especially in high-pressure environments, the safety protection function of the pressure relief valve is particularly important.

3. Advantages of direct-acting pressure relief valve
Sensitive response: The design structure of the direct-acting pressure relief valve is simple, and it can respond quickly to pressure changes, open and close in time to ensure system safety.
Simple structure and high reliability: The pressure relief valve usually adopts a simple mechanical structure, which reduces the failure rate and is more convenient for maintenance.
Easy adjustment: By adjusting the preload of the spring, the pressure relief valve can easily set different opening pressures to meet the needs of different working conditions.
Low cost: Compared with complex pressure control devices, the manufacturing cost of direct-acting pressure relief valves is lower and suitable for various hydraulic system occasions.