Matsakaicin matsi na DBD su ne bawul ɗin poppet masu aiki kai tsaye. Ana amfani da su don iyakance matsa lamba a cikin tsarin hydraulic. Bawuloli galibi sun ƙunshi hannun riga, bazara. poppet tare da damping spool (matakan matsa lamba 2.5 zuwa 40 MPa) ko ball (matakin matsa lamba 63 MPa) da kuma daidaita kashi. Saitin tsarin matsa lamba yana da iyaka mara iyaka ta hanyar daidaitawa kashi. Ruwan bazara yana tura poppet akan wurin zama. An haɗa tashar P zuwa tsarin. Ana amfani da matsin lamba a cikin tsarin zuwa yankin poppet (ko beli)

Idan matsa lamba a tashar P ya tashi sama da bawul ɗin da aka saita a bazara, poppet yana buɗewa da bazara. Yanzu ruwan matsi yana gudana tashoshi P zuwa tashar T. An iyakance bugun bugun poppet ta fil. Don kula da saitunan matsa lamba mai kyau a kan duk iyakar matsa lamba an raba kewayon matsa lamba zuwa matakan matsa lamba 7. Mataki ɗaya na matsa lamba yayi daidai da takamaiman maɓuɓɓugar ruwa don matsakaicin matsa lamba mai aiki wanda ƙila a saita dashi.