The primary function of the bypass valve in an excavator is to prevent engine damage due to lack of lubrication when the oil filter becomes clogged, and to enhance the dynamic stability of actuators or control valves.

The design of the excavator’s bypass valve addresses the potential issue of oil filter blockage. When the oil filter gets clogged, the bypass valve automatically opens, allowing oil to bypass the blocked filter and continue supplying the engine. This is crucial for maintaining the normal operation of the engine and extending its service life by preventing damage from inadequate lubrication.

Additionally, the bypass valve plays a role in the Load Sensing (LS) circuit by regulating the pilot oil pressure (PLS). It mitigates abrupt changes in oil pressure and creates an effective pressure drop between the main valve’s throttle port and the LS shuttle valve. These functions collectively improve the dynamic stability of the actuators or control valves. This design helps ensure the smooth operation and efficiency of the excavator during work, reducing the risk of mechanical failures caused by pressure fluctuations.

In summary, the bypass valve in an excavator effectively protects the engine from damage while enhancing the stability and reliability of the entire mechanical system through its design and functionality.

Product NO.	Applicable models	Weight	Packaging unit
410128-00055	DH150W-7 DH215-9E DH220LC-9E DX55WE DX60W ECO-1/DX60WN ECO-1 DX60W ECO-2/DX60WN ECO-2 DX60W ECO/DX60WN ECO DX60W(S/N:20001~21000) DX60W-10/DX60W-10N DX60W-9C(S/N:20001~21000) DX60W-9C/DX60W-9CN DX53W DX55W DX55W ACE DX55W ACE PLUS(S/N:6025~) E55W SOLAR 225NLC-V	0.2KG	EA
410128-00049	DH150W-7 DH55GOLD DX75 DX80 DX88-9C (S/N:20001~20232) DX88-9C (S/N:20233~) DX140W / DX160W TIER-II SOLAR 75-V	0.08KG	EA
410128-00031	DH210W-7(S/N:21001~) DH215-9E DH220LC-9E DH225LC-9 DX1000HD-10 DX1000LC-9C DX120 DX120-9C DX125W-10/DX125W-10N DX125W-9C/DX125W-9CN DX130-10/DX130-10N DX130-9C/DX130-9CN DX140AF/DX140LCA DX150-9C/DX150LC-9C/DX150LC-9CN DX150LC DX150LC-10/DX150LC-10N DX150W(S2) DX150W-10/DX150W-10N DX150W-7B DX150W-9C/DX150W-9CN DX150WE-10/DX150WE-10N DX150WE-9C/DX150WE-9CN DX190-3B/DX200-3B DX200-9C (CN)/DX200-9C (CN) ACE DX205-10/DX205-10N DX205-10A/DX205-10NA DX210-7M DX210W-10/DX210W-10N DX210W-7B DX210W-9C(S/N:30001~) DX210W-9C/DX210W-9CN DX215-10/DX215-10N DX215-5B DX215-9CACE/DX215-9CNACE DX215-9C/DX215-9CN DX220LC-7M DX220LC-9C DX220LC-9C ACE DX220LCA-2 / DX220A-2 DX220LCA-2M / DX220A-2M DX225-10 DX225CD-9C DX225LC-10 DX225LC-9C DX230LC-9C DX245HD-10 DX245LC-9C ACE DX260LC DX260LC-9C DX270HD-10 DX270LC-9C ACE DX300LC-7B DX300LC-9C DX305HD-10 DX305LC-9C ACE DX340LC-9C DX360LC-3B DX360LC-7B DX360LC-9C DX380-10 DX380-9C ACE DX380HD-10 DX380LC DX380LC-9C DX380LC-9C ACE DX400LC-7B DX420LC DX450LC-3B/DX450LC-9C DX490LC-9C/DX500LC-9C/DX520LC-9C DX500-9CACE/DX500LC-9C ACE/DX560LC-9CACE DX500HD-10/DX560HD-10 DX500LC-9C (S/N:22001~22044) DX500LC-9C ACE/DX560LC-9C ACE (S/N:30001~) DX500LC/DX500LCG DX680HD-10 DX700LC DX800HD-10 DX800LC-9C DX1000LC-7 STAGE5/TIER4 DX1000LC-7 TIER3 DX100W-7 DX100W-7 DX140A DX140LC DX140LC-3 / DX160LC-3 DX140LC-5 DX140LC-5 / DX160LC-5 DX140LC-5K(L) DX140LC-7 / DX160LC-7 DX140LC-7K / DX160LC-7K DX140LCR DX140LCR-3 DX140LCR-5 DX140LCR-5K(L) DX140LCR-7 DX140R DX140W / DX160W TIER-II DX140W / DX160W TIER-III DX140W ACE PLUS(S/N:8141~) DX140W-3 / DX160W-3 DX140W-5 DX140W-5 / DX160W-5 DX140W-5K(L)/DX160W-5K(L)(S/N:2485~) DX140W-7 / DX160W-7 DX150LC-7 DX150LC-7(S/N:2001~) DX150LCR-7 DX150W-7 / DX170W-7 DX165W-5 DX165WR-7 DX170LC-5 DX170LC-7 DX170W DX170W-5 DX170W-7 DX170WR-7 DX180LC DX180LC-3 DX180LC-5 DX190W DX190W-3 DX190W-5 DX190W-7 DX190WA(T-2) DX200A DX200A(S/N:1001~) DX200LC-7 DX210 / DX225LCB DX210-7 / DX210LC-7 / DX210NLC-7 DX210W DX210W-5 DX210W-5B DX210W-5K(L) DX210W-7 DX210WA DX210WA(T-2) DX220A / DX225LCA DX220AF DX220AF(S/N:1001~) DX220AF-7M DX220LC-5 DX220LC-5K(L) DX220LCA DX220W-7 DX225LC (S/N 5433~) DX225LC-3 DX225LC-5 DX225LC-7 DX225LC-7M / DX225-7M DX225LC-7X DX225LCA(S/N:1001~) DX225LCA-2 / DX200A-2 DX225LCA-7M / DX200A-7M DX225NLC DX225NLCA DX230LC DX235LC-5 DX235LC-7 / DX245NHD-7 DX235LCR DX235LCR-5 DX235LCR-5 DX235LCR-5K(L) DX235LCR-7 DX235NLC-5 DX240LC-7 DX240LC-7X DX240LCR-7 DX255LC DX255LC-3 DX255LC-5 DX255LC-7 DX260LCA DX300LC DX300LC-3 DX300LC-3(S/N:1001~1511) DX300LC-3(S/N:1512~) DX300LC-5 DX300LC-5(S/N:1001~1057) DX300LC-5(S/N:1058~) DX300LC-5(S/N:20001~) DX300LC-5K(L) DX300LC-7 DX300LC-7K DX300LC-7M / DX320LC-7M DX300LCA DX300LCA-7M DX300LCE DX320LC-7 DX340LC DX340LC-3 / DX350LC-3 DX340LC-5/DX350LC-5(S/N:10001~10049) DX340LC-5 / DX350LC-5(S/N:10050~) DX340LC-5 / DX350LC-5(S/N:20001~) DX340LCA-K / DX360LCA-K(S/N:20001~) DX350LC DX350LC-7 DX350LC-7K DX350LCA / DX360LCA DX350LCR-7 DX360LC-7M DX360LCA-7M DX380LC DX380LC-3 DX380LC-3(OCEANIA) DX380LC-5 DX380LC-5 / DX400LC-5 DX380LC-5K(L) DX380LC-7 DX380LC-7K DX380LCA DX400LC-7 DX400LC-7M DX420LC DX420LC-3 DX420LC-5(S/N:10001~10010) DX420LC-5(S/N:10011~) DX420LC-7 DX420LC-7K DX420LCA DX420LCA-K(S/N:20001~) DX450LC-7M DX450LCA-7M DX480LC DX480LCA / DX500LCA DX480LCA / DX500LCA / DX520LCA DX480LCA-K / DX520LCA-K(S/N:20001~) DX490LC-3 DX490LC-5 / DX530LC-5 DX490LC-5(S/N:10001~10011) DX490LC-5(S/N:10012~) DX490LC-7 / DX530LC-7 DX490LC-7K / DX530LC-7K DX490LC-7M / DX530LC-7M DX490LCA-7M / DX530LCA-7M DX520LC / DX520LCA DX520LCA DX530LC-3 DX530LC-5(NT)(S/N:10001~10024) DX530LC-5(NT)(S/N:10025~) DX530LC-5(S/N:10001~10006) DX530LC-5(S/N:10001~10055) DX530LC-5(S/N:10007~) DX530LC-5(S/N:10056~) DX530LC-5B DX530LC-5K(L) DX550LC-7 DX650LC-7 DX700LC DX700LCA DX800LC-5B DX800LC-7 DX800LC-7 DX85R-7 DX85R-7 / DX89R-7 E100W E145 E145-7 E165 HW100A HX1000AL HX1000L HX355ALCR HX800AL HX800L SOLAR 180W-V SOLAR 185W-V SOLAR 210W-V SOLAR 225NLC-V SOLAR 255LC-V SOLAR 470LC-V SOLAR 470LC-V SOLAR 500LC-V DX140LC-3 DX140W-3 / DX160W-3 DX160LC-3 DX180LC-3 DX225LC-3 DX235NLC DX255LC-3 DX300LC-3	0.258KG	EA
410128-00075	DX130-10/DX130-10N DX130-9C/DX130-9CN DX140AF/DX140LCA DX150-9C/DX150LC-9C/DX150LC-9CN DX150LC-10/DX150LC-10N DX55-5B DX55-5B DX55-5C DX55-9C(CN) ACE DX55-9C(CN)/DX60E-9C(CN)/DX60E-9C ACE DX60 ACE-10/DX60 ACE-10N DX60-5B DX60-9C DX60-9CGOLD/DX65-9C PLUS/DX65-9CN PLUS DX60E-10/DX60E-10N(S/N:20001~) DX60E-10/DX60E-10N(S/N:30001~) DX60E-10/DX60E-10N(S/N:50001~) E58 DX140LC-7 / DX160LC-7 DX140LC-7K / DX160LC-7K DX140LCR-7 DX150LC-7 DX150LC-7(S/N:2001~) DX150LCR-7 DX165WR-7 DX170LC-7 DX170WR-7 DX55-5 DX55-5K(L)(S/N:2066~) DX55MT-5 DX55MT-5K(L)(S/N:2066~) DX65-7 / DX65MT-7 E145-7	0.21KG	EA
410128-00053	DX210-7M DX215-10/DX215-10N DX215-9C ACE/DX215-9CN ACE DX220LC-7M DX220LC-9C ACE DX225-10 DX225LC-10 DX245HD-10 DX245LC-9C ACE DX270HD-10 DX270LC-9C ACE DX300LC-7B DX305HD-10 DX305LC-9C ACE DX340LC-9C DX360LC-3B DX360LC-7B DX360LC-9C DX380-10 DX380-9C ACE DX380HD-10 DX380LC DX380LC-9C DX380LC-9C ACE DX400LC-7B DX420LC DX450LC-3B/DX450LC-9C DX490LC-9C/DX500LC-9C/DX520LC-9C DX500LC-9C (S/N:22001~22044) DX500LC/DX500LCG DX220AF-7M DX225LC-7 DX225LC-7M / DX225-7M DX225LC-7X DX225LCA-7M / DX200A-7M DX240LC-7 DX240LC-7X DX255LC-7 DX300LC-3 DX300LC-3(S/N:1001~1511) DX300LC-3(S/N:1512~) DX300LC-5 DX300LC-5(S/N:1001~1057) DX300LC-5(S/N:1058~) DX300LC-5(S/N:20001~) DX300LC-5K(L) DX300LC-7 DX300LC-7K DX300LC-7M / DX320LC-7M DX300LCA-7M DX320LC-7 DX340LC DX340LCA DX340LCA-K / DX360LCA-K(S/N:20001~) DX350LC DX350LCA / DX360LCA DX360LCA(S/N:5950~) DX380LC DX380LCA DX420LC DX420LC-3 DX420LC-5(S/N:10001~10010) DX420LC-5(S/N:10011~) DX420LC-7 DX420LCA DX420LCA-K(S/N:20001~) DX480LC DX480LCA / DX500LCA DX480LCA / DX500LCA / DX520LCA DX480LCA-K / DX520LCA-K(S/N:20001~) DX490LC-3 DX490LC-5(S/N:10001~10011) DX490LC-5(S/N:10012~) DX520LC / DX520LCA DX520LCA DX530LC-3 DX530LC-5(NT)(S/N:10001~10024) DX530LC-5(NT)(S/N:10025~) DX530LC-5(S/N:10001~10006) DX530LC-5(S/N:10001~10055) DX530LC-5(S/N:10007~) DX530LC-5(S/N:10056~) DX530LC-5B DX300LC-3	0.5KG	EA
410128-00009B	DX360LC-3B DX360LC-7B DX360LC-9C DX380-10 DX380-9C ACE DX380HD-10 DX380LC-9C DX380LC-9C ACE DX400LC-7B DX450LC-3B/DX450LC-9C DX490LC-9C/DX500LC-9C/DX520LC-9C DX500LC-9C (S/N:22001~22044) DX700LC DX420LC-3 DX420LC-5(S/N:10001~10010) DX420LC-5(S/N:10011~) DX420LC-7 DX490LC-3 DX490LC-5(S/N:10001~10011) DX490LC-5(S/N:10012~) DX530LC-3 DX530LC-5(NT)(S/N:10001~10024) DX530LC-5(NT)(S/N:10025~) DX530LC-5(S/N:10001~10006) DX530LC-5(S/N:10001~10055) DX530LC-5(S/N:10007~) DX530LC-5(S/N:10056~) DX530LC-5B DX700LC DX700LCA	0.44KG	EA