How to change the valve of a car tire?

What everyone cares about is "how to change the valve of automobile tires?" Let me explain something to you:

Replacement method of automobile tire valve;

1. Before replacement, the sundries at the installation hole of the steel ring valve should be handled and polished smoothly.

2. Cut an old inner tube with the valve, and cut a circle around the valve with a radius of 2 cm;

3. Two rubber rings with the same size, one ring is installed on the valve and then on the steel ring, and the valve screw is installed on the valve outside the other steel ring, and some sealant can be coated around the valve instead.