Excavator Main Safety Valve
Product Description: Excavator Main Safety Valve for Hitachi (4289602) The excavator main safety valve from Flying Bull is a critical hydraulic system component designed for Hitachi excavators. Compatible with models including the EX200-2, EX200-3, EX220-2, and EX220-3, this valve (OE No. 4289602) is a direct replacement for the original equipment. It serves the essential function of protecting the hydraulic system from overpressure conditions, ensuring safe and reliable operation of the boom, arm, bucket, and swing functions. Protecting Your Hydraulic System The main safety valve, typically installed on the main control valve, limits the maximum system pressure. In a hydraulic excavator, various operations—such as lifting a heavy load or breaking rock—can cause pressure spikes that could damage pumps, cylinders, hoses, and other expensive components. This valve acts as a safeguard by opening when the system pressure exceeds its set cracking pressure, diverting excess flow back to the tank and preventing pressure from rising to dangerous levels. Its reliable sealing and stable cracking pressure ensure consistent protection over a long service life, even in demanding excavation applications. Quality and Direct Replacement Flying Bull’s main safety valve is manufactured to meet or exceed original equipment specifications. It is supplied as a 100% brand-new unit, manufactured in Zhejiang, China, and backed by a 1‑year warranty. Delivery takes 5–7 working days. For equipment owners and repair shops, replacing a failed or worn main safety valve with a quality aftermarket part restores critical system protection, preventing costly repairs and downtime.
Product Introduction
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OE NO.: 28660-R9L-003 |
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Warranty: 1 YEAR |
Condition:New, 100% Brand-new |
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Place of Origin:Zhejiang, China |
Ltem: hydraforce Pressure Sensor
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Brand Name:FLYING BULL |
Quality:High-Quality |
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Delivery:5-7 Working Days |
Pressure:Ordinary Pressure |
For Honda 28660-R9L-003 CVT transmission oil pressure sensor
application area
Pressure sensor is the most commonly used sensor in industrial practice, which is widely used in various industrial automatic control environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemical, oil wells, electric power, ships, machine tools, pipelines and many other industries. Specifically, pressure sensors are mainly used in:
Hydraulic system: pressure sensor is mainly used to complete the closed-loop control of force in hydraulic system.
Safety control system: mainly aimed at the safety management system of air compressor itself.
Injection mold: Pressure sensors can be installed in the nozzle, hot runner system, cold runner system and mold cavity of the injection molding machine, which can measure the plastic pressure somewhere between the nozzle and the mold cavity of the injection molding machine during injection molding, mold filling, pressure maintaining and cooling.
Mine pressure monitoring: Mine pressure sensors mainly include semiconductor piezoresistive pressure sensors, metal strain gauge pressure sensors and differential transformer pressure sensors.
In addition, heavy-duty pressure sensors are usually used in transportation applications to maintain the performance of heavy-duty equipment by monitoring the pressure, hydraulic pressure, flow rate and liquid level of key systems such as pneumatic, light-duty hydraulic pressure, braking pressure, oil pressure, transmission device and air brake of truck or trailer.
Company Introduction
Frequently Asked Questions (FAQs)
1. What is the function of the excavator main safety valve?
It acts as a system pressure limiter. It protects hydraulic components (pumps, cylinders, hoses, and the main control valve) from damage caused by excessive pressure spikes that can occur during heavy digging or lifting operations.
2. Which Hitachi excavator models are compatible with the 4289602 main safety valve?
This valve is compatible with Hitachi EX200-2, EX200-3, EX220-2, and EX220-3 excavators. Always verify your machine's model and the original part number to ensure correct fitment.
3. Where is the main safety valve installed on the excavator?
It is typically installed on the main control valve assembly. The main control valve is the central hydraulic component that directs oil flow to the boom, arm, bucket, and swing motors.
4. What are the symptoms of a faulty main safety valve?
Symptoms can include: weak hydraulic power (boom/arm/bucket cannot lift or move properly), overheating of hydraulic oil, erratic or jerky attachment movement, or in some cases, no movement at all. Conversely, a valve that sticks closed can allow pressure to build to damaging levels.
5. Is this main safety valve new or rebuilt?
The valve is 100% brand new, not rebuilt or remanufactured. Each unit is quality tested to ensure reliable performance.
6. What warranty is provided with the 4289602 main safety valve?
Flying Bull provides a 1‑year warranty against manufacturing defects. Damage caused by contaminated fluid, improper installation, or use outside specified pressure ratings is not covered. Always use clean hydraulic oil and follow proper torque specifications during installation.
7. What delivery time can I expect?
Standard delivery takes 5–7 working days from Zhejiang, China. Bulk orders and custom packaging options are available upon request.
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