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Main & Relief Valves
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Vendor: BeeSpareParts
For Toyota 1DZ Cylinder Head Gasket 11115-78200-71 FIT Truck Forklift 1DZ Diesel Engine Parts
Regular price $ 29 -
Vendor: Toyota
Engine Mounting Insulator 12371-40101-71 for Toyota 4Y 13Z GM6-262 5R 4P 11Z 1FZ 1DZ
Regular price $ 38 -
Vendor: Toyota
Rear Axle Dampener 43191-23421-71 for Toyota Engine 1DZ 1ZS 4Y 3Z 2Z Forklift 02-7FD20 02-7FD25 02-7FG20 02-7FG25 40-7FG20 40-7FG25
Regular price $ 168 -
Vendor: Komatsu
Mount 12361-26601-71 for Toyota Engine 1DZ 1ZS 4Y 3Z 2Z Forklift 02-8FDF15 02-8FDF18 02-8FDF20 02-8FDF25 02-8FDF30 02-8FDJF35 02-8FDKF20
Regular price $ 240
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Vendor: Komatsu
PC60-8 PC70-8 PC78US-8 Main Relief Valve Assy 723-20-63300
PC60-8 PC70-8 PC78US-8 Main Relief Valve Assy 723-20-63300 Part Number: 723-20-63300 Application: PC60-8 PC70-8 PC78US-8 Condition: New Aftermarket Parts In StockRegular price $ 98 -
Vendor: Hitachi
Service Relief Valve 4308965 for Hitachi EX120-2 EX120-3
Service Relief Valve 4308965 for Hitachi EX120-2 EX120-3 Part Number: 4308965 Application: for Hitachi EX120-2 EX120-3 Condition: New Aftermarket Parts In StockSale price $ 79Regular price $ 109 -
Vendor: Hope Backhoe Parts
6754-72-1220 Overflow Pressure Limit Relief Valve For Komatsu PC200-8 Excavator
6754-72-1220 Overflow Pressure Limit Relief Valve For Komatsu PC200-8 Excavator Part Number: 6754-72-1220 Application: For Komatsu PC200-8 Excavator Condition: New Aftermarket Parts In StockRegular price $ 60 -
Vendor: Hope Backhoe Parts
723-40-71900 Pressure Relief Valve For Komatsu PC220/300-8 Excavator Valve Part
Product Information: Part No.: 723-40-71900 Package includes: 1 pc Pressure Relief Valve Application :For Komatsu PC220/300-8 ExcavatorRegular price $ 120 -
Vendor: Hitachi
Main Relief Valve 4228354 for Hitachi EX200 EX200-1 EX220-3 EX300-2 EX300-3
Main Relief Valve 4228354 for Hitachi EX200 EX200-1 EX220-3 EX300-2 EX300-3 Part Number: 4228354 Application: for Hitachi EX200 EX200-1 EX220-3 EX300-2 EX300-3 Condition: New Aftermarket Parts In StockRegular price $ 82 -
Vendor: Komatsu
6745-71-4330 Fit Excavator Relief Valve Limiter PC300-8 PC350-8
6745-71-4330 Fit Excavator Relief Valve Limiter PC300-8 PC350-8 Part Number: 6745-71-4330 Application: PC300-8 PC350-8 Condition: New Aftermarket Parts In StockRegular price $ 52
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.