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Main & Relief Valves
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Vendor: Hitachi
4358914 Pressure Relief Valve Control Valve FITS for Hitachi Ex200-5 EX220-5
Regular price $ 89 -
Vendor: Case
Relief Valve LJ014720 for CASE excavator CX210B CX210 CX240B CX240 CX290B
Regular price $ 129 -
Vendor: Case
Relief Valve LJ017090 for CASE Excavator CX350B CX360B CX370B SUMITOMO SH350-5
Regular price $ 138 -
Vendor: Doosan
Main Relief Valve K9001804 42000257 420-00257 Compatible with Doosan Daewoo Excavator DX210 DX225LCB DX230LC DX220AF DX225LC
Regular price $ 168 -
Vendor: Hitachi
Relief Valve 4654845 4654860 For Hitachi EXCAVATOR ZX350-3 ZAXIS240-3 ZAXIS240LC-3
Regular price $ 98 -
Vendor: Caterpillar
E325B E329D E330B E345C 184-3830 Swing Motor Main Excavator Relief Valve
Regular price $ 128 -
Vendor: Hitachi
EX200-3 EX200-5 Relief Valve Ass'y For SWING MOTOR Hitachi 4386065 4341859
Regular price $ 98 -
Vendor: Hitachi
14518516 8230-27400 Relief Valve for Volvo EC200D EC210 EC210B EC210C
Regular price $ 89 -
Vendor: Hitachi
4372034 For Hitachi EX200-5 Excavator Pump Control Valve Relief Valve
Regular price $ 198 -
Vendor: Hitachi
Swing Motor Relief Valve 4286404 4328226 4373201 Compatible with Hitachi Excavator EX100-2 EX120-2 EX100-3 EX120-3 EX100-5 EX100-5 EX120-5 EX135UR EX140US-5 ZX125W
Regular price $ 118 -
Vendor: Hitachi
9159923 4300918 4383067 Relief Valve Fits HITACHI Excavator Spare Parts For EX100-5 EX120-5
Regular price $ 178 -
Vendor: Hitachi
Fits HITACHI ZAX120 EX120 EX135 Relief Valve 4372682 4372683 9203496 9203495 9200489
Regular price $ 98
How does a main & relief valves work?
1. The function and working principle of the excavator main gun
The main gun of the excavator is one of the main control valves in the hydraulic system of the excavator. It mainly controls the working pressure and flow of the hydraulic system. The setting of the main gun can not only generate sufficient working pressure for the hydraulic system, but also control the flow of hydraulic oil to ensure the normal operation of each component and the normal operation of the excavator.
The working principle of the main gun is: when the hydraulic pump starts to work, the hydraulic oil will be pressed into the main gun, flowing inside the main gun to generate a high-pressure oil flow, and then sent to the hydraulic motor and other hydraulic components through pipes. Since the main gun has a certain built-in regulating valve, the high-pressure oil flow can be adjusted as needed to meet the needs of different working conditions.
2. The function and working principle of the auxiliary relief valve of the excavator
The auxiliary relief valve of the excavator is a relief valve in the hydraulic system of the excavator. It mainly plays the role of preventing overload of the hydraulic system and protecting system components from damage. When hydraulic oil flows through the auxiliary relief valve, if the system's working pressure exceeds the set value, the valve will automatically open and slowly release the excess hydraulic oil back to the tank, thereby protecting the hydraulic components from damage.
The working principle of the auxiliary relief valve is: when the working pressure of the hydraulic system exceeds the set value, the steel balls and springs separate, and the hydraulic oil will flow back to the tank through the channel in the valve. By adjusting the tightness of the spring, the valve opening pressure can be controlled to adapt to different working needs.
In short, the excavator main gun and auxiliary relief valve are important components in the excavator hydraulic system. They mainly play the role of controlling the pressure and flow of the hydraulic system, ensuring the normal operation of the hydraulic system and protecting system components from damage.