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壓力補(bǔ)償閥基本原理根據(jù)壓力補(bǔ)償閥布置在整個(gè)液壓油路中的位置，負(fù)載壓力補(bǔ)償控制系統(tǒng)還可以分為閥前壓力補(bǔ)償負(fù)載系統(tǒng)和閥后壓力補(bǔ)償負(fù)載系統(tǒng)。閥前補(bǔ)償是指壓力補(bǔ)償閥布置在油泵與縱閥之間，閥后補(bǔ)償是指壓力補(bǔ)償閥布置在縱閥與執(zhí)行機(jī)構(gòu)之間。閥后補(bǔ)償比閥前補(bǔ)償要，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(bǔ)償?shù)闹鏖y，導(dǎo)致的結(jié)果是向輕載去的流量多，重載去的流量少，就是輕載動(dòng)得快，復(fù)合動(dòng)作時(shí)，各個(gè)執(zhí)行元件不同步。而閥后補(bǔ)償沒有這個(gè)問題，會(huì)比例分配泵所提供的流量，復(fù)合動(dòng)作時(shí)使各個(gè)執(zhí)行元件同步。負(fù)荷傳感系統(tǒng)分閥前補(bǔ)償和閥后補(bǔ)償，當(dāng)有兩個(gè)或兩個(gè)以上的負(fù)載同時(shí)動(dòng)作時(shí)，如果主泵提供的流量足夠滿足系統(tǒng)所需流量，閥前補(bǔ)償和閥后補(bǔ)償?shù)淖饔檬且粯拥模蝗绻鞅锰峁┑牧髁繜o法滿足系統(tǒng)所需流量，那么閥前補(bǔ)償?shù)哪欠N情況是：主泵流量往負(fù)荷小的負(fù)載提供流量，當(dāng)滿足完了負(fù)荷小的負(fù)載的流量要求時(shí)，才往其他的負(fù)載供流量；而閥后補(bǔ)償?shù)那闆r是：同比（閥開口量）減少各個(gè)負(fù)載的流量供給，達(dá)到動(dòng)作很協(xié)調(diào)。即：主泵提供的流量無法滿足系統(tǒng)所需流量時(shí)，閥前補(bǔ)償?shù)牧髁糠峙渑c負(fù)載有關(guān)，而閥后補(bǔ)償?shù)牧髁糠峙渑c負(fù)載無關(guān)，只與主閥的開口量有關(guān)。

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