Ukuhlaziywa okungalungile kwe-valve yevemvane yaseShayina: kukhona ukulinganiselwa ekubekweni uphawu nokucindezela
Njengesisetshenziswa esisetshenziswa kakhulu sokulawula uketshezi,I-valve ye-butterfly yaseShayina inezinzuzo zesakhiwo esilula nokusebenza okulula, kodwa kunemikhawulo ethile ekubekweni uphawu nokucindezela. Lesi sihloko sizohlaziya ukushiyeka kwamavalve ovemvane baseShayina ngokombono wochwepheshe.