How to repair the air leakage under the three-axis synchronous valve of trailer

The solution to the air leakage problem of the three-axis synchronous valve of trailer is to remove the valve for maintenance and replace the seal that may lead to air leakage, but the trailer control valve of this vehicle still leaks after being repaired and put into use. It was forced to replace the trailer valve of the assembly. The causes of air leakage are: air leakage of the trailer valve itself, that is, air leakage when the trailer valve works or does not work, indicating that the trailer valve needs to be replaced, which is also caused by air leakage of the three-axis synchronous valve of the trailer behind. There is a reason for this air leakage. If the trailer valve leaks when you step on the brake or pull the hand brake, it is proved that it has nothing to do with the trailer valve itself, but is caused by the return air of the trailer three-axis synchronous valve. As a braking component developed for long-distance transportation of three-axle semi-trailer, the three-axle synchronous valve was originally patented by Shandong Zibo Yiwei Automobile Parts Co., Ltd. ..