Relief Valve

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Main Relief Control Valve for Daewoo Doosan DH220-5 Excavator

Introducing the Main Relief Control Valve for Daewoo Doosan DH220-5 Excavator, expertly manufactured by Ningbo Longerfa Hydraulic Co., Ltd. This high-quality hydraulic component is designed to ensure optimal performance and reliability for your excavator operations. Engineered with precision, our Main Relief Control Valve effectively regulates hydraulic pressure, enhancing the efficiency and safety of your machinery. It is built to withstand demanding working conditions, ensuring durability and longevity. As a trusted supplier, Ningbo Longerfa Hydraulic Co., Ltd. is committed to delivering superior products that meet industry standards. Choose our Main Relief Control Valve for unmatched performance and dependability in your Daewoo Doosan DH220-5 Excavator, and experience enhanced productivity on every job site

Application Excavator
Model Daewoo Doosan DH220-5
Type Pilot-Operated Type

Product Detail

Main Relief Control Valve for Daewoo Doosan DH220-5 Excavator

The main relief control valve in a Daewoo Doosan DH220 - 5 excavator is a crucial component.

1. Function

Pressure regulation: It is responsible for controlling and limiting the maximum hydraulic pressure in the system. For example, when the excavator's hydraulic cylinders (such as those for the boom, arm, and bucket) are under heavy load or during sudden movements that could cause a pressure spike, the relief valve opens to release excess pressure. This prevents damage to the hydraulic system components like hoses, cylinders, and pumps. If the pressure in the hydraulic circuit exceeds the set value , the valve allows the hydraulic fluid to bypass back to the reservoir.
Flow control and stability: The valve also helps in maintaining a stable flow of hydraulic fluid. By regulating the pressure, it ensures that the hydraulic actuators (cylinders and motors) receive a consistent and appropriate amount of fluid power. This is essential for the smooth operation of the excavator's various functions, such as digging, lifting, and swinging.

2. Construction and Components

Valve body: It is typically a robust metal casting that houses the internal components. The body has multiple ports for the inlet and outlet of hydraulic fluid. These ports are connected to different parts of the hydraulic system, such as the hydraulic pump, cylinders, and the return line to the reservoir.
Spool: The spool is a movable part inside the valve body. Its position determines whether the valve is open, closed, or in a partially open state. The spool's movement is controlled by the hydraulic pressure difference across it and the force exerted by springs. As the pressure changes, the spool moves to adjust the flow path of the hydraulic fluid. For example, when the pressure reaches the relief setting, the spool shifts to allow the fluid to flow from the high - pressure side to the low - pressure (return) side.
Springs: Springs play a vital role in setting the relief pressure. The pre - load on the spring determines the pressure at which the valve will start to open. By adjusting the spring tension, the relief pressure can be calibrated according to the requirements of the excavator's hydraulic system.

3. Maintenance and Troubleshooting

Regular maintenance: It is essential to keep the relief valve clean. Over time, dirt, debris, and metal particles from the hydraulic system can accumulate on the valve components. This can cause the valve to stick or not operate properly. Periodic inspection and cleaning of the valve, as well as changing the hydraulic fluid and filters according to the manufacturer's schedule, can help prevent such issues.
Troubleshooting: If the excavator's hydraulic functions seem weak or unresponsive, it could be due to a problem with the relief valve. For example, if the valve is stuck open, the hydraulic pressure will not build up properly, resulting in sluggish operation of the cylinders and motors. On the other hand, if the valve is stuck closed, it can lead to over - pressurization and potential damage to the system. Diagnostic tools such as pressure gauges can be used to measure the hydraulic pressure at different points in the system to identify if the relief valve is functioning correctly.

4. Compatibility and Replacement

Original Equipment Manufacturer (OEM) vs. aftermarket parts: When replacing the main relief control valve, it is important to consider using high-quality aftermarket parts. which can be a more cost-effective alternative, of good quality, and have the correct specifications to fit and function properly in the excavator's hydraulic system. Our parts are designed specifically for the Daewoo Doosan DH220-5 excavator and are guaranteed to meet the original performance and quality standards.
Installation and calibration: After installing a new relief valve, it usually requires calibration to ensure that the relief pressure is set correctly. This may involve adjusting the spring tension and testing the valve's operation under different load conditions to make sure it provides the appropriate pressure relief and system stability.