GVO Main Relief Valve 31QB-17730 for R500LC7 R520LC9 R520LC9A R520LC9S RD510LC-7 Excavators

GVO Main Relief Valve 31QB-17730 for R500LC7 R520LC9 R520LC9A R520LC9S RD510LC-7 Excavators

 Key attributes

Precise Overload Protection – The valve instantly opens when system pressure exceeds its preset limit, diverting excess oil back to the tank to protect expensive components from pressure spikes and overload damage. On compatible models, the setting pressure can be raised when the power max function is activated, increasing digging power.

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

1.The pictures

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GVO Company Overview  

  Guangzhou GVO Precision Hydraulic is a professional manufacturer and exporter specializing in the research, development, and production of cost-effective hydraulic components and electrical parts for excavators. Headquartered in Guangzhou, China, we are dedicated to providing reliable solutions that balance quality and affordability for the global construction machinery industry.

  We manufacture and supply hydraulic pumps, gear pumps, pressure relief valves, throttle motors, and a complete range of electrical components. Our product lineup covers most mainstream excavator brands and models, with complete specifications and extensive inventory to ensure timely delivery.

  All components are precision-machined and inspected under strict quality control standards. Our products deliver high precision, excellent pressure resistance, superior sealing, and stable performance — effectively resolving common mechanical failures such as power deficiency, hydraulic leakage, system jitter, and electrical malfunctions.

  As a direct factory supplier, we eliminate intermediaries and provide high-quality replacement parts with reliable compatibility, consistent durability, and competitive pricing — ensuring exceptional value for our customers.With mature production systems, comprehensive export capabilities, and a strong commitment to customer satisfaction, we support bulk orders, customized processing, and efficient global delivery. Through stable product quality and responsive after-sales support, we have established long-term, trusting partnerships with clients 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 — Cost-Effective. Reliable. Trusted Worldwide.