Umahluko wemveliso yevalve enamacala amathathu
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Ivalve yebhola eneziqwenga ezibini yidayamitha epheleleyo, ngamaqhekeza amabini evalve yomzimba ebambeneyo ibhola esisigxina, ukugcinwa kuntsokothile, umbindi we-screw tightness yeyona nto iphambili, enxulumene nokuba kuvuza komoya.Ukutywinwa okulungileyo;
Ivalve yebhola eneziqwenga ezintathu iyafana nevalve yebhola enamacala amabini, nayo igcwele idayamitha, kodwa kukho umzimba wevalve embindini webhola, emva koko icinezelwe macala omabini ngeflange yentamo, uxinzelelo lungcono, ukufakwa ngokulula, lula ukuqhaqha, ukugcinwa kunye nokucoca.

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