Wanpela rot bilong bosim bek presa bilong wanpela haidrolik injeksen molding masin i kamap ples klia. Dispela rot i save winim bek presa kontrol long taim bilong putim ol samting long rot bilong putim namba wan daireksenel kontrol valv, namba tu daireksenel kontrol valv, wanpela presa sensa, na wanpela 'throttle valve' namel long injeksen silinda na oil tenk. Taim masin bilong 'hydraulic injection molding' i go insait long hap bilong putim ol samting.
Ol A na T pot bilong namba wan 'directional control valve' i op, na dispela i kirapim oil i kam bek. Oil long baksait bilong injeksen silinda i save ron i go long oil tenk long namba wan 'directional control valve' na 'throttle valve'. Long wankain taim, ol i opim B na P pot bilong namba tu daireksenel kontrol valv, na larim oil long oil tenk i ron i go insait long baksait bilong injeksen silinda long rot bilong oil pam na namba tu daireksenel kontrol valv. Long dispela taim, wanpela PID kontrola i save bungim presa veliu we presa sensa i painim na painimaut stebiliti bilong bek presa bihainim presa veliu we ol i bungim. Taim bek presa i no stap gut, PID kontrola i save bosim autput spit bilong oil pam bilong haidrolik injeksen molding masin long rot bilong bosim mota long mekim bek presa i stap gut. Gutpela samting em i bikpela kontrol ekyuresi, na i mekim bikpela-presisen bek presa kontrol.
