Hydraulic extraction check valve is one of the key equipment commonly used in industries such as petrochemicals, electric power, and chemical engineering. Its main function is to prevent fluid backflow in pipelines and ensure normal fluid flow. However, various malfunctions often occur during use, affecting the normal operation of the equipment. Below, we will introduce some common faults and solutions of hydraulic extraction check valves. 
1、 Leakage of hydraulic extraction check valve 
1. Fault manifestation: When the hydraulic extraction check valve is working, the pressure of the gas source system is normal, but it is found that the valve has air leakage. 
2. Cause of malfunction: Air leakage is mainly caused by wear of the valve sealing surface, aging of the sealing ring, and uneven sealing surface. 
3. Solution: 
(1) Check if the sealing surface is worn. If it is severely worn, the sealing surface needs to be replaced. 
(2) Check if the sealing ring is aging, and if it is aging, replace the sealing ring. 
(3) Check if the sealing surface is flat. If it is not flat, it needs to be ground. 
2、 The valve seat of the hydraulic extraction check valve is not tightly sealed 
1. Fault manifestation: After the hydraulic extraction check valve was closed, a small amount of fluid was found to leak through the valve seat. 
2. Cause of malfunction: Uneven sealing surface of valve seat, aging of valve seat sealing ring, and other reasons. 
3. Solution: 
(1) Check if the sealing surface of the valve seat is flat. If it is not flat, it needs to be ground. 
(2) Check if the valve seat sealing ring is aging, and if it is aging, replace the sealing ring. 
Hydraulic extraction check valve manufacturer 
3、 Hydraulic extraction check valve disc stuck 
1. Fault manifestation: When the hydraulic extraction check valve is working, it is found that the valve disc is not flexible and even stuck. 
2. Cause of malfunction: There are impurities between the valve disc and the valve seat, and the damping spring has insufficient elasticity. 
3. Solution: 
(1) Clean the debris between the valve disc and valve seat. 
(2) Check if the damping spring has sufficient elasticity. If it is insufficient, replace the spring. 
4、 Unstable air supply for hydraulic extraction check valve 
1. Fault manifestation: When the hydraulic extraction check valve is working, the air source pressure is unstable, causing the valve to fail to open or close normally. 
2. Cause of malfunction: Unstable pressure in the gas source system, incorrect adjustment of the pressure gauge, and other reasons. 
3. Solution: 
(1) Check if there is any air leakage in the gas source system, and seal it if necessary. 
(2) Check if the pressure gauge adjustment is correct, if not, adjust it accordingly. 
5、 The vibration and noise of the hydraulic extraction check valve are loud 
1. Fault manifestation: When the hydraulic extraction check valve is working, it emits obvious vibration noise. 
2. Reason for malfunction: The valve installation is unstable, and the air source pressure is too high. 
3. Solution: 
(1) Check if the valve is securely installed, and adjust it if it is not. 
(2) Check if the air source pressure is too high, and adjust it if it is too high. 
In summary, common faults of hydraulic extraction check valves during use mainly include air leakage, poor sealing of valve seats, valve disc jamming, unstable gas supply, and loud valve vibration and noise. I hope the solutions introduced above can be helpful in solving practical problems for you. It should also be pointed out that the hydraulic extraction check valve involves complex working conditions and maintenance requirements. If serious faults are encountered, it is recommended to hire professional technicians to handle them to ensure the safety and normal operation of the equipment.