GVO 31QB-17730 Rotary Hydraulic Pump Valve Main Relief Valve for R480LC9 R480LC9A R480LC9S Excavators

GVO 31QB-17730 Rotary Hydraulic Pump Valve Main Relief Valve for R480LC9 R480LC9A R480LC9S Excavators

 Key attributes

Precise Pressure Control

   The main relief valve senses the operating pressure of the hydraulic system and accurately limits it to a preset safe level. When pressure exceeds this value due to heavy loads or sudden shocks, the valve opens instantly to return high-pressure oil to the tank, effectively preventing damage to the main pump, control valves, cylinders, and other core components caused by overloading.

Ensures System Stability

  As the "safety valve" of the hydraulic system, it ensures the entire system operates within a safe pressure range. Stable pressure is the foundation for smooth, powerful excavator movements – directly impacting working efficiency and precision.

If you need other relief valves, send us the related details please:

1.The pictures

2.The p/n

3.The size

GVO Company Overview  

  Guangzhou GVO Precision Hydraulic is a professional manufacturer and exporter specializing in the research, development, and production of precision hydraulic components and electrical systems for excavators. Headquartered in Guangzhou, China, we are dedicated to upholding the highest standards of professionalism and precision in every product we deliver to the global construction machinery industry.We specialize in hydraulic pumps, gear pumps, pressure relief valves, throttle motors, and a comprehensive range of electrical components. Our product portfolio covers most mainstream excavator brands and models, with complete specifications and substantial inventory to ensure fast and reliable order fulfilment.

  All components are precision-machined using advanced manufacturing techniques and undergo rigorous quality inspection at every stage of production. Our products are distinguished by high precision, excellent pressure resistance, superior sealing performance, and stable operation — effectively resolving common mechanical failures such as power deficiency, hydraulic leakage, system vibration, and electrical malfunctions.

  As a direct factory supplier, we eliminate intermediaries and provide high-quality replacement parts with assured compatibility, long-lasting durability, and cost-effective pricing.With mature production systems, comprehensive export capabilities, and a professional service team, we support bulk orders, customized processing, and reliable global delivery. Through consistent product quality and dedicated after-sales support, we have established long-term, trusted partnerships with customers worldwide.

Operational Capabilities

  We maintain a comprehensive supply chain covering engine, hydraulic, electrical, sealing, bearing, and gear components for all major excavator brands. Our 40,000 m³ warehousing facility ensures extensive stock availability, enabling same-day dispatch and rapid order fulfilment.

Our team

GVO — Professionalism in Every Part. Precision in Every Delivery.