211350306 Rotary Hydraulic Pump Valve Main Relief Valve Main Control Relief Valve Safety Valve for HD1430 Excavators Valve Parts

Key attributes

Critical Overload Protection

As the main relief valve, it protects the entire hydraulic system by limiting maximum pressure. When system pressure exceeds the preset limit, the valve instantly opens to divert excess oil back to the tank, preventing catastrophic damage to the main pump, control valves, cylinders, and other expensive components. A failed main relief valve affects all hydraulic functions simultaneously and is the first valve to suspect when system-wide low pressure is confirmed.

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GVO Company Overview

Guangzhou GVO Precision Hydraulic is a professional manufacturer and exporter of precision-engineered hydraulic and electrical components for excavators. From our operations in Guangzhou, China, we are committed to delivering products that combine precision engineering with superior performance for the global construction machinery industry.

We produce hydraulic pumps, gear pumps, pressure relief valves, throttle motors, and a full series of electrical components. Our product range covers most mainstream excavator brands and models, with complete specifications and ample stock to meet customer requirements.

All components are manufactured with advanced precision machining technologies and subjected to rigorous inspection at every stage of production. Our products feature high precision, excellent pressure resistance, superior sealing, and stable performance — effectively preventing common issues such as power loss, hydraulic leakage, system vibration, and electrical faults.

As a direct factory supplier, we offer high-quality replacement parts with guaranteed compatibility, long-lasting durability, and competitive pricing, without intermediary markups.With mature production systems, comprehensive export logistics, and a focus on performance excellence, we support bulk orders, custom specifications, and timely global delivery. Through consistent product quality and dedicated after-sales support, we have cultivated enduring, trust-based relationships with customers around the world.

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 — Precision. Performance. Partnership.