Njengomvelisi okhokelayo wee-valves zeshishini, Cokwaren uneqhayiya lokuveza imveliso yethu entsha - ukuyeka i-valves. Eli valve esemgangathweni eliphezulu lenzelwe ukubonelela ngentsebenzo ebalaseleyo kunye nokuthembeka, kwaye izinto zayo ezizodwa ziyenza ilungele uluhlu olubanzi lwezicelo.