GRVS08-20 direct acting relief valve: how to effectively regulate system pressure?

1、 Understand the working principle
The GRVS08-20 direct acting relief valve is a crucial pressure control component in hydraulic systems, and its core working principle is based on the balance between spring and hydraulic pressure. When the system pressure gradually increases to the preset value, the hydraulic pressure on the valve core will overcome the pre tension force of the spring, push the valve core to move, and open the valve port, allowing excess hydraulic oil to flow back to the oil tank and prevent the system pressure from continuing to rise. This process is dynamic, and as the system pressure changes, the position of the valve core will also be adjusted accordingly to maintain the system pressure within the preset safe range. Understanding this working principle is a prerequisite for effective regulation. It helps us realize that the key to regulating system pressure is to adjust the hydraulic pressure required for the valve core to open, that is, the preload force of the spring, which is usually achieved by rotating the adjustment screw.

2、 Adjustment steps
Prepare tools and equipment: Before adjusting the GRVS08-20 direct acting relief valve, ensure that you have appropriate tools on hand, such as precision screwdrivers, pressure gauges, safety locks, etc. The selection of pressure gauges should ensure that their range covers the maximum possible pressure of the system and their accuracy is high enough for accurate measurement. At the same time, considering the potential safety risks during the adjustment process, wear personal protective equipment such as safety goggles, gloves, etc. to ensure the safe operation of the adjustment process.
Shut down the system and release pressure: Before adjusting, it is necessary to ensure that the hydraulic system has been completely shut down and all pressure in the system has been completely released. This can be achieved by turning off the hydraulic pump, cutting off the power supply, and using a pressure relief valve. Ensuring that the system is completely stress free is the foundation for regulating work safety and avoiding accidents caused by misoperation or residual pressure in the system.
Positioning adjustment screw and preliminary adjustment: Find the adjustment screw on the GRVS08-20 direct acting relief valve, which is usually a prominent feature on the valve and easy to identify. Before adjusting, use a screwdriver to gently rotate the adjusting screw and feel its rotational resistance and direction. The counterclockwise direction is usually used to reduce the set pressure, while the clockwise direction is used to increase the set pressure. During the initial adjustment, it is recommended to adjust with a small amplitude (such as rotating 1/4 turn each time) and observe the changes in the pressure gauge reading. This can avoid excessive fluctuations in the pressure setting value, which can affect the stable operation of the system.
Measurement and adjustment: Restart the system and monitor the actual pressure value using a pressure gauge. During the adjustment process, patiently observe the reading of the pressure gauge and gradually adjust the adjustment screw based on the measurement results until the system pressure reaches the desired set value. During the adjustment process, it may be necessary to repeatedly turn on and off the system to verify the adjustment effect. After each adjustment, wait for the system to stabilize before proceeding to the next measurement to ensure the accuracy and stability of the adjustment.
Locking adjustment screw: Once the appropriate setting value is found, a locking device (such as a locking nut) should be used to secure the adjustment screw to prevent changes in pressure setting value due to vibration, temperature changes, or misoperation. When locking, ensure that the locking device is firm and reliable to avoid loosening and causing adjustment failure. At the same time, record the adjusted set values for reference during subsequent maintenance and inspection.

3、 Precautions
Safety first: During the adjustment process, it is essential to comply with all safety regulations to ensure that no harm is caused to personnel or equipment. This includes wearing personal protective equipment, turning off system power, and releasing system pressure. During the adjustment process, if abnormal situations or uncertain factors are encountered, the operation should be stopped immediately and professional assistance should be sought.
Gradual adjustment: Avoid making large adjustments to the adjustment screws at once to prevent excessive pressure fluctuations in the system and affect the stable operation of the equipment. Gradual adjustment can ensure precise control of pressure changes with each adjustment, avoiding system failures or damage caused by improper adjustment.
Monitoring and verification: After the adjustment is completed, the system pressure should be continuously monitored to ensure stable operation within the set range. Use a pressure gauge for regular measurements and record data to promptly identify and resolve potential issues. If necessary, fine adjustments can be made again to ensure the stability and accuracy of the system pressure.
Maintenance: Regularly maintain the GRVS08-20 direct acting relief valve and check for wear, leaks, and other issues. Maintenance includes cleaning the valve body, replacing worn parts, checking the spring elasticity, etc. Through regular maintenance, the service life of valves can be extended, and the stability and reliability of the system can be improved. At the same time, keep the valve clean and dry to prevent dust and moisture from entering the valve and affecting its normal operation.