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Main & Relief Valves
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Vendor: Komatsu
PC60-8 PC70-8 PC78US-8 Main Relief Valve Assy 723-20-63300
Regular price $ 98 -
Vendor: Hitachi
Service Relief Valve 4308965 for Hitachi EX120-2 EX120-3
Sale price $ 79Regular price $ 109 -
Vendor: Hope Backhoe Parts
6754-72-1220 Overflow Pressure Limit Relief Valve For Komatsu PC200-8 Excavator
Regular price $ 60 -
Vendor: Hope Backhoe Parts
723-40-71900 Pressure Relief Valve For Komatsu PC220/300-8 Excavator Valve Part
Regular price $ 120 -
Vendor: Hitachi
Main Relief Valve 4228354 for Hitachi EX200 EX200-1 EX220-3 EX300-2 EX300-3
Regular price $ 82 -
Vendor: Komatsu
6745-71-4330 Fit Excavator Relief Valve Limiter PC300-8 PC350-8
Regular price $ 52 -
Vendor: Komatsu
Relief Valve 723-40-50200 For Komatsu Excavator PC200-6 PC210-6 PC220-6 PC230-6
Regular price $ 129 -
Vendor: Hitachi
Relief Valve 9134147 for Hitachi EX200-3 EX200-2 EX200-5 9102256 9114686 9115733
Regular price $ 129 -
Vendor: Hyundai
EXCAVATOR MAIN CONTROL VALVE OVERLOAD RELIEF VALVE 31N8-17430 FOR EXCAVATOR R210LC7 R215LC7 R290LC7 R300LC7 R305LC7
Sale price $ 61Regular price $ 199 -
Vendor: Kobelco
SK200-6 SK200-8 Excavator Relief Valve YN22V00013F1
Regular price $ 120 -
Vendor: Caterpillar
119-5338 159-7732 6E-5933 107-7033 E320 E320B 320B Main Relief Valve 1195338 1597732 6E5933 1077033
Regular price $ 120 -
Vendor: Hitachi
ZX350LC-5G ZX330-5G Excavator Main Relief Valve YA00004936
Regular price $ 89
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.