The problem of oil leakage in servo valve 072-1202-10 can be checked and dealt with from the following aspects:

1. Surface processing quality of installation seat
-Reason: Poor surface processing quality of the installation seat, such as uneven surface, burrs, etc., may lead to poor sealing and oil leakage.
-Solution: Check the machining quality of the installation seat surface, and if necessary, reprocess or replace the installation seat to ensure a smooth and clean surface.

2. Damaged sealing ring
-Reason: One of the common causes of oil leakage is damage to the sealing rings at the valve port and valve top plugs.
-Solution: Check the wear of the sealing ring and replace the damaged sealing ring in a timely manner.

3. Oil leakage between motor cover and valve body
-Reason: Oil leakage between the motor cover and valve body may be caused by a ruptured spring tube or internal oil pipe.
-Solution: Check the integrity of the spring tube and internal oil tube, and replace relevant components promptly if any problems are found.

4. Oil contamination
-Reason: Dirty oil may cause increased wear on seals, leading to oil leakage.
-Solution: Regularly replace hydraulic oil and filter element to keep the oil clean.

5. Other inspections
-Check electrical connections: Ensure that the electrical connections of the servo valve are correct to avoid abnormal pressure changes caused by electrical problems, which can lead to oil leakage.
-System inspection: Check other components of the hydraulic system, such as hydraulic pumps, cylinders, etc., to ensure the normal operation of the entire system.