The loop flushing function of a piston pump usually involves the use of a loop flushing shuttle valve and a flushing relief valve. 1. Loop flushing shuttle valve: The loop flushing shuttle valve is a directional control valve that allows fluid to bypass the plunger pump and return directly to the reservoir during the flushing process. It diverts a portion of the fluid from the discharge side of the pump back to the tank, preventing it from entering the rest of the hydraulic system. When the circuit flushing shuttle valve is activated, it creates a path for fluid to bypass the main hydraulic circuit and return to the reservoir. This helps remove contamination or excess fluid from the system without affecting the operation of other components. 2. Flush overflow valve: Flush overflow valve is also known as overflow valve or pressure relief valve, and its design purpose is to limit the maximum pressure in the flushing circuit. It ensures that the pressure does not exceed a predetermined level, protecting the system from potential damage caused by excessive pressure during flushing. Flush relief valves are usually set at a lower pressure than relief valves used in the main hydraulic circuit. This ensures that the flushing circuit operates at lower pressure, reducing the risk of system damage while still allowing effective flushing. During flushing, if the pressure in the flushing circuit exceeds the set limit, the flushing relief valve opens, allowing excess fluid to flow back into the reservoir. This prevents pressure spikes and protects components in the flushing circuit. 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Flushing procedure: The loop flushing function is usually initiated by activating the loop flushing shuttle valve. This can be done manually or automatically using a control mechanism. When the shuttle valve is activated, it changes its position to allow fluid to bypass the pump and flow directly back to the reservoir. 4. Flushing fluid: In the flushing process, a separate flushing fluid is usually used, such as flushing oil or a compatible cleaning fluid. This fluid is introduced into the system to remove contamination, debris or residual fluid from the hydraulic circuit. With the loop flushing function of the plunger pump, the flushing fluid is circulated through the system. 5. Duration of flushing: The duration of the flushing process can vary according to the specific requirements and degree of contamination of the hydraulic system. It is important to follow the recommended flushing duration provided by the pump manufacturer or hydraulic system specialist to ensure thorough cleaning. 6. Monitoring and adjustment: During the flushing process, the monitoring of system parameters such as flow, pressure, and temperature is very important. Adjustments may be required to ensure the flushing process is effective and within safe operating ranges. Flush relief valves help maintain controlled pressure levels during the process. 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Post-flush step: After the flushing process is complete, the flushing fluid must be drained and cleaned from the system. Flush fluid should be disposed of properly according to local regulations. Afterwards, the system can be refilled with the recommended hydraulic fluid and any necessary system adjustments can be made. 8. Maintenance and system health: The circuit flushing function is an important maintenance procedure to ensure the health and life of the hydraulic system. By regularly flushing the system, contaminants, sludge and any residual fluid are removed, preventing potential damage to the pump and other system components. 9. Flush Interval: How often to perform a loop flush procedure depends on a variety of factors, including operating conditions, environmental factors, and the level of contamination in the system. It is recommended to follow the manufacturer's guidelines or consult a hydraulics specialist to determine the appropriate flush interval for your particular application. 10. Flush system integration: In some cases, loop flush functionality can be integrated into the overall hydraulic system design, utilizing additional components such as filters, valves or dedicated flush lines. These components help to increase the effectiveness and simplify the operation of the flushing process. 11. System Purge: Before performing a loop flushing procedure, it is important to remove any air or gas that may have accumulated in the system. Air can cause performance issues and hinder the effectiveness of the flushing process. Venting the system or using proper air cleaning techniques will help ensure optimal flushing. 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Maintenance Records: Keep detailed records of circuit flushing activities, including dates, duration of flushing, flushing fluid used, and any observations made during the process. These records are invaluable for future reference, maintenance planning, and tracking the overall health of the system. 13. Professional Assistance: If you are unsure about any aspect of the circuit flushing procedure or experience difficulty during the process, it is recommended to seek professional assistance. A hydraulic system specialist or manufacturer's technical support can provide guidance, troubleshoot problems and provide recommendations tailored to your specific system requirements. Remember to always refer to the manufacturer's documentation and guidelines for accurate and specific information on the loop flushing feature of your Danfoss piston pump model. Following proper maintenance procedures and recommended methods will help ensure optimum performance, reliability and longevity of your hydraulic system.