?1、泵芯磨損：泵芯與軸之間，泵殼與軸之間，活塞之間均有接觸；當(dāng)柱塞泵工作時，由于內(nèi)部溫度升高而產(chǎn)生沖擊作用；在摩擦作用下泵芯與軸之間的間隙逐漸變小當(dāng)發(fā)生過壓保護(hù)故障時發(fā)動機(jī)可能不工作至規(guī)定的極限狀態(tài)；當(dāng)過壓保護(hù)開關(guān)失靈時可能導(dǎo)致嚴(yán)重的安全事故。
2、密封失效：由于密封失效使泵進(jìn)入氣缸的空氣減少，泵腔中的雜質(zhì)和氣泡增多從而引起泵內(nèi)氣體膨脹或爆炸3、機(jī)械磨損：由于柱塞泵過壓保護(hù)功能的失效（例如閥桿密封墊片和壓蓋密封件損壞）會導(dǎo)致泵的機(jī)械強(qiáng)度下降，進(jìn)而導(dǎo)致機(jī)器的部件壽命降低。
4、泄漏增加；由于過壓保護(hù)功能失效會造成吸入空氣減少而使進(jìn)氣不足 1、過壓保護(hù)作用： 柱塞泵在工作時，由于泵內(nèi)的壓力變化導(dǎo)致壓力容器內(nèi)壓力上升，此時如過壓保護(hù)開關(guān)失靈，會使空氣進(jìn)入系統(tǒng)形成不平衡狀態(tài)，從而導(dǎo)致進(jìn)排氣系統(tǒng)不平衡（俗稱“悶缸”）。
此時若對進(jìn)排氣閥門進(jìn)行保護(hù)，就可以防止進(jìn)排氣閥門之間的壓力變化以及吸入系統(tǒng)中的氣體發(fā)生爆炸但是過壓保護(hù)開關(guān)具有一種“非接觸式”保護(hù)作用——當(dāng)柱塞泵啟動時不能正常運(yùn)轉(zhuǎn)，當(dāng)系統(tǒng)達(dá)到額定壓力時又能正常運(yùn)轉(zhuǎn)過壓保護(hù)功能就在這個時候發(fā)揮作用了。
2、對設(shè)備的影響 (1)影響正常運(yùn)轉(zhuǎn)：當(dāng)發(fā)生故障時，由于流量的突然變化，造成泵腔中氣體體積突然增加，導(dǎo)致活塞產(chǎn)生瞬間的壓力劇增此時缸體可能因壓力劇增而引起活塞產(chǎn)生局部過熱現(xiàn)象(2)縮短設(shè)備壽命：由于過壓保護(hù)故障時泵被壓蓋壓住，密封不嚴(yán)易造成泄漏、振動等問題。
(3)損壞零件：由于壓蓋密封墊片受損或漏氣引起泵排氣不足并發(fā)生高溫高壓的危害因此必須加強(qiáng)對過壓保護(hù)開關(guān)的維護(hù)管理和保養(yǎng)工作(4)縮短設(shè)備壽命：由于柱塞泵長期運(yùn)轉(zhuǎn)會產(chǎn)生大量微小氣泡，使活塞承受高溫高壓而產(chǎn)生熱應(yīng)力，活塞熱應(yīng)力將造成液壓元件損壞和泵件泄漏。
90-L-180-HF-5-BC-80-S-M-C8-H-03-NNN-32-14-30 90L180HF5BC80SMC8H03NNN321430 90L180-HF-5-BC-80-S-M-C8-J-03-NNN-32-32-24 90L180HF5BC80SMC8J03NNN323224 90-L-180-HF-5-BC-80-S-M-C8-J-03-NNN-32-32-24 90L180HF5BC80SMC8J03NNN323224 90L180-HF-5-BC-80-T-C-C8-H-03-NNN-32-32-24 90L180HF5BC80TCC8H03NNN323224 90-L-180-HF-5-BC-80-T-C-C8-H-03-NNN-32-32-24 90L180HF5BC80TCC8H03NNN323224 90L180-HF-5-BC-80-T-C-C8-J-03-NNN-32-32-24 90L180HF5BC80TCC8J03NNN323224 90-L-180-HF-5-BC-80-T-C-C8-J-03-NNN-32-32-24 90L180HF5BC80TCC8J03NNN323224 90L180-HF-5-BC-80-T-M-F1-H-03-FAC-23-23-24 90L180HF5BC80TMF1H03FAC232324 90-L-180-HF-5-BC-80-T-M-F1-H-03-FAC-23-23-24 90L180HF5BC80TMF1H03FAC232324 90L180-HF-5-CD-80-S-C-C8-H-03-NNN-30-30-28 90L180HF5CD80SCC8H03NNN303028 90-L-180-HF-5-CD-80-S-C-C8-H-03-NNN-30-30-28 90L180HF5CD80SCC8H03NNN303028 90L180-HF-5-CD-80-S-C-C8-H-03-NNN-35-35-28 90L180HF5CD80SCC8H03NNN353528 90-L-180-HF-5-CD-80-S-C-C8-H-03-NNN-35-35-28 90L180HF5CD80SCC8H03NNN353528 90L180-HF-5-CD-80-S-C-C8-J-03-NNN-35-35-28 90L180HF5CD80SCC8J03NNN353528 90-L-180-HF-5-CD-80-S-C-C8-J-03-NNN-35-35-28 90L180HF5CD80SCC8J03NNN353528 90L180-HF-5-CD-80-S-M-F1-H-03-FAC-14-14-22 90L180HF5CD80SMF1H03FAC141422 90-L-180-HF-5-CD-80-S-M-F1-H-03-FAC-14-14-22 90L180HF5CD80SMF1H03FAC141422 90L180-HF-5-CD-80-T-C-C8-J-03-NNN-35-35-28 90L180HF5CD80TCC8J03NNN353528 90-L-180-HF-5-CD-80-T-C-C8-J-03-NNN-35-35-28 90L180HF5CD80TCC8J03NNN353528 90L180-HF-5-CD-80-T-C-F1-H-03-FAC-35-35-24 90L180HF5CD80TCF1H03FAC353524 90-L-180-HF-5-CD-80-T-C-F1-H-03-FAC-35-35-24 90L180HF5CD80TCF1H03FAC353524 90L180-HF-5-CD-80-T-C-F1-J-03-EBA-42-42-24 90L180HF5CD80TCF1J03EBA424224 90-L-180-HF-5-CD-80-T-C-F1-J-03-EBA-42-42-24 90L180HF5CD80TCF1J03EBA424224 90L180-HF-5-CD-80-T-M-C8-J-03-NNN-38-38-28 90L180HF5CD80TMC8J03NNN383828 90-L-180-HF-5-CD-80-T-M-C8-J-03-NNN-38-38-28 90L180HF5CD80TMC8J03NNN383828 90L180-HF-5-CD-80-T-M-C8-J-03-NNN-42-42-28 90L180HF5CD80TMC8J03NNN424228 90-L-180-HF-5-CD-80-T-M-C8-J-03-NNN-42-42-28 90L180HF5CD80TMC8J03NNN424228 90L180-HF-5-CD-80-T-M-F1-H-03-FAC-35-35-24 90L180HF5CD80TMF1H03FAC353524 90-L-180-HF-5-CD-80-T-M-F1-H-03-FAC-35-35-24 90L180HF5CD80TMF1H03FAC353524 90L180-HF-5-DE-80-S-C-C8-J-03-NNN-32-32-28 90L180HF5DE80SCC8J03NNN323228 90-L-180-HF-5-DE-80-S-C-C8-J-03-NNN-32-32-28 90L180HF5DE80SCC8J03NNN323228 90L180-HF-5-DE-80-S-C-F1-J-03-NNN-32-32-28 90L180HF5DE80SCF1J03NNN323228 90-L-180-HF-5-DE-80-S-C-F1-J-03-NNN-32-32-28 90L180HF5DE80SCF1J03NNN323228 90L180-HF-5-DE-80-T-C-C8-J-03-NNN-35-35-24 90L180HF5DE80TCC8J03NNN353524 90-L-180-HF-5-DE-80-T-C-C8-J-03-NNN-35-35-24 90L180HF5DE80TCC8J03NNN353524 90L180-HF-5-DE-80-T-C-F1-J-03-FAC-23-23-28 90L180HF5DE80TCF1J03FAC232328 90-L-180-HF-5-DE-80-T-C-F1-J-03-FAC-23-23-28 90L180HF5DE80TCF1J03FAC232328 90L180-HF-5-EF-80-T-M-F1-H-03-EBA-38-38-24 90L180HF5EF80TMF1H03EBA383824 90-L-180-HF-5-EF-80-T-M-F1-H-03-EBA-38-38-24 90L180HF5EF80TMF1H03EBA383824 90L180-HF-5-EG-80-S-C-C8-H-03-NNN-35-35-28 90L180HF5EG80SCC8H03NNN353528 90-L-180-HF-5-EG-80-S-C-C8-H-03-NNN-35-35-28 90L180HF5EG80SCC8H03NNN353528 90L180-HF-5-NN-80-S-C-C8-J-03-NNN-38-38-24 90L180HF5NN80SCC8J03NNN383824 90-L-180-HF-5-NN-80-S-C-C8-J-03-NNN-38-38-24 90L180HF5NN80SCC8J03NNN383824 90L180-HF-5-NN-80-S-C-C8-J-05-NNN-42-42-30 90L180HF5NN80SCC8J05NNN424230 90-L-180-HF-5-NN-80-S-C-C8-J-05-NNN-42-42-30 90L180HF5NN80SCC8J05NNN424230 90L180-HF-5-NN-80-S-C-F1-H-04-NNN-40-40-24 90L180HF5NN80SCF1H04NNN404024 90-L-180-HF-5-NN-80-S-C-F1-H-04-NNN-40-40-24 90L180HF5NN80SCF1H04NNN404024 90L180-HF-5-NN-80-S-C-F1-J-03-NNN-42-42-24 90L180HF5NN80SCF1J03NNN424224 90-L-180-HF-5-NN-80-S-C-F1-J-03-NNN-42-42-24 90L180HF5NN80SCF1J03NNN424224 90L180-HF-5-NN-80-S-M-F1-H-03-FAC-32-14-30 90L180HF5NN80SMF1H03FAC321430 90-L-180-HF-5-NN-80-S-M-F1-H-03-FAC-32-14-30 90L180HF5NN80SMF1H03FAC321430 90L180-HF-5-NN-80-T-C-F1-J-03-FAC-35-35-24 90L180HF5NN80TCF1J03FAC353524 90-L-180-HF-5-NN-80-T-C-F1-J-03-FAC-35-35-24 90L180HF5NN80TCF1J03FAC353524 90L180-HF-5-NN-80-T-C-F1-J-03-NNN-38-38-24 90L180HF5NN80TCF1J03NNN383824 90-L-180-HF-5-NN-80-T-C-F1-J-03-NNN-38-38-24 90L180HF5NN80TCF1J03NNN383824 90L180-HF-5-NN-80-T-C-F1-J-03-NNN-42-42-24 90L180HF5NN80TCF1J03NNN424224 90-L-180-HF-5-NN-80-T-C-F1-J-03-NNN-42-42-24 90L180HF5NN80TCF1J03NNN424224。
