壓力補償閥基本原理根據(jù)壓力補償閥布置在整個液壓油路中的位置,負載壓力補償控制系統(tǒng)還可以分為閥前壓力補償負載系統(tǒng)和閥后壓力補償負載系統(tǒng)。閥前補償是指壓力補償閥布置在油泵與縱閥之間,閥后補償是指壓力補償閥布置在縱閥與執(zhí)行機構之間。閥后補償比閥前補償要先進,主要體現(xiàn)在泵供油不足的情況下。如果泵供油不足的話,閥前補償?shù)闹鏖y,導致的結果是向輕載去的流量多,重載去的流量少,就是輕載動得快,復合動作時,各個執(zhí)行元件不同步。而閥后補償沒有這個問題,會比例分配泵所提供的流量,復合動作時使各個執(zhí)行元件同步。負荷傳感系統(tǒng)分閥前補償和閥后補償,當有兩個或兩個以上的負載同時動作時,如果主泵提供的流量足夠滿足系統(tǒng)所需流量,閥前補償和閥后補償?shù)淖饔檬且粯拥?;如果主泵提供的流量無法滿足系統(tǒng)所需流量,那么閥前補償?shù)哪欠N情況是:主泵流量往負荷小的負載提供流量,當滿足完了負荷小的負載的流量要求時,才往其他的負載供流量;而閥后補償?shù)那闆r是:同比(閥開口量)減少各個負載的流量供給,達到動作很協(xié)調。即:主泵提供的流量無法滿足系統(tǒng)所需流量時,閥前補償?shù)牧髁糠峙渑c負載有關,而閥后補償?shù)牧髁糠峙渑c負載無關,只與主閥的開口量有關。
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力士樂壓力補償器