The valve core is arranged in the inner hole of the upper end of the inner tube valve. The air valve is an important component part of the hollow tyre, which is used for inflating and deflating the air when the tire is used and vulcanizing. The valve structure should ensure that the following requirements: 

1.With the charge and discharge performance; the easy to check the air pressure of the inner tube; 

2.he good air tightness, no leakage under pressure; 

3.the manufacture is simple, unified specifications, convenient replacement;

4. in ioocc high temperature and a low temperature of 40 DEG C, rubber failure, 

5.can be combined with the inner tube the fastening; wear resistance, no rust coating or peeling off