GVO Hydraulic Control Valve Main Relief Valve Safety Overflow Valve Pilot Relief Valve for HD400-1 HD450 Excavator Valve Parts

GVO Hydraulic Control Valve Main Relief Valve Safety Overflow Valve Pilot Relief Valve for HD400-1 HD450 Excavator Valve Parts

 Key attribute

Product profile

•   The main relief valve serves as the primary safety device for the hydraulic circuit. When system pressure exceeds the preset limit due to heavy loads or sudden shocks, the valve opens instantly to relieve excess oil back to the tank. This prevents damage to the main pump, cylinders, control valves, and hydraulic lines – protecting the machine from costly downtime and repair costs.
•   The valve maintains consistent hydraulic pressure across the entire system. The pilot relief valve allows for precise adjustment of pilot circuit pressure.

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Company Introduction

Guangzhou GVO Precision Hydraulic Co., Ltd. is a professional manufacturer and exporter of hydraulic components, electrical systems, and engine parts for excavators. Founded in 2017 and headquartered in Guangzhou, China, we serve the global construction machinery industry with quality parts, factory-direct pricing, and reliable delivery.

Why Choose Us

We are a factory, not a middleman. That means we control quality, pricing, and delivery — no unnecessary markups. Every part is inspected before shipment to ensure reliable performance. If you are not sure about the model, we help you confirm it and avoid mistakes. And if any problem arises after delivery, we stay available to help you solve it.

Our customers include distributors, construction teams, repair shops, and individual machine owners. No matter the order size, we treat everyone the same. Our products are exported to more than 30 countries and regions across Asia, Africa, Europe, and the Americas.

With a philosophy of “Quality First, Customer Foremost,” we hope to become your trusted long-term parts partner.

What We Do

We supply a full range of excavator components, including hydraulic pumps, gear pumps, relief valves, throttle motors, sensors, solenoid valves, regulators, wiring harnesses, and engine parts. Our products are compatible with major brands such as Komatsu, Catt, Kobelco, Hitachi, VolvOo, Hyundai, Doosan, Sany, XCMG, JCB, and Case. With over 1,000 part numbers in stock, we can respond quickly to common and urgent requirements.

  GVO — Precision Components. Global Supply. Trusted Partnership.