QSB6.7 QSB5.9 common rail pressure relief valve for Cummins parts 3963808

QSB6.7 QSB5.9 common rail pressure relief valve for Cummins parts 3963808

product description

introduce

The Common Rail Pressure Relief Valve with part number 3963808 is an important component for Cummins QSB6.7 and QSB5.9 engines. Here is a detailed introduction:

### Basic Information
- **Part Number**: The main part number is 3963808, which may have some cross - reference numbers. It is applicable to various vehicle brands and models equipped with Cummins QSB6.7 and QSB5.9 engines, including some models of trucks, buses, and construction machinery.
- **Function**: The primary function of this valve is to maintain the fuel pressure in the common rail system of the engine within a safe and appropriate range. In the common rail fuel injection system of Cummins QSB6.7 and QSB5.9 engines, the fuel is stored in the common rail at a high pressure. The pressure relief valve monitors the pressure in the common rail and opens when the pressure exceeds the set value to release the excess fuel back to the fuel tank, thereby preventing the fuel system from being damaged due to excessive pressure.

### Working Principle
- The pressure relief valve operates based on the principle of balancing the spring force and the fuel pressure. Inside the valve, there is a spring - loaded plunger. Under normal operating conditions, the spring force keeps the plunger in a closed position, blocking the fuel passage. When the pressure in the common rail rises above the set pressure, the fuel pressure overcomes the spring force, causing the plunger to move and open the valve, allowing the fuel to flow out through the relief passage. As the fuel pressure decreases to the normal range, the spring force pushes the plunger back to the closed position, stopping the fuel from flowing out.

### Installation and Maintenance
- **Installation**: The pressure relief valve is usually installed on the common rail of the fuel injection system. The specific installation location may vary slightly depending on the engine model and the overall layout of the vehicle or equipment. During installation, it is necessary to ensure that the valve is properly connected and sealed to prevent fuel leakage.
- **Maintenance**: Regular inspection and maintenance of the pressure relief valve are required. Check for any signs of fuel leakage, loose connections, or damage to the valve. Clean the valve regularly to remove dirt and debris that may affect its performance. It is also recommended to check the pressure - relief set value regularly to ensure that it is within the normal range. If any problems are found, the valve should be repaired or replaced in a timely manner to ensure the normal operation of the fuel injection system.

### Troubleshooting
- If the engine experiences problems such as abnormal fuel pressure, rough idling, or reduced power, the common rail pressure relief valve may be faulty. Some common problems include a stuck valve plunger, a damaged spring, or a leaky valve seat. To troubleshoot, first check the external connections and appearance of the valve. Then, use a pressure gauge to measure the fuel pressure in the common rail to determine if it is within the normal range. If the pressure is abnormal, further inspection of the pressure relief valve is required, and it may need to be replaced if necessary. necessary.

COMPANY INFORMATION

Guangzhou Tengsong Machinery Equipment Co., Ltd. is a large-scale enterprise loed in Guangzhou, a famous city in China, where the largest distribution center for construction machinery parts is loed in Asia. Founded in 2003, with more than 18 years of practice and experience, we have established a complete ordering and delivery service system. Our company specializes in wholesale OEM spare parts for construction machinery companies.

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