GVO 709-70-55200 709-90-74203 Auxiliary Relief Valve Pressure Relief Valve

Product Specification

GVO 709-70-55200 709-90-74203 Auxiliary Relief Valve Pressure Relief Valve Safety Valve PC200-5 PC200-6 Excavator Parts

Product Description

The GVO excavator relief valve, compatible with Hitachi excavators, is a key pressure control valve in the hydraulic system. It regulates hydraulic pressure, releases overload pressure, protects core hydraulic components such as the main valve and hydraulic pump, and ensures stable operation of the entire machine.

This relief valve is precision-machined from high-quality steel and undergoes overall quenching treatment. Equipped with oil-resistant and high-pressure-resistant seals, it boasts excellent sealing performance, impact resistance, and wear resistance. Suitable for the high-pressure hydraulic conditions of excavators, it effectively prevents internal leakage, pressure loss, operational instability, and vibration.

Product Introduction

This GVO cartridge-type relief valve is a main control valve pressure relief component specifically developed for the Komatsu PC200-5 and PC200-6 classic 20-ton excavators. As a core safety protection component of the hydraulic system, it is directly interchangeable with the older fifth-generation PC200-5 and the sixth-generation PC200-6 models (both with different head sizes). It is also compatible with derivative models on the same platform, such as the PC210-5, PC210-6, and PC220-5. It is a high-demand, essential wear part in the construction machinery maintenance market.

The valve core and seat sealing assembly utilizes a high-precision CNC external cylindrical grinding and internal honing composite machining process. The clearance between the valve core and valve sleeve is controlled within a micron-level range, minimizing internal leakage of high-pressure hydraulic oil and eliminating system pressure drop and weak digging power caused by internal leakage at the hardware level.

The valve stem undergoes a vacuum carburizing and quenching process followed by low-temperature tempering, resulting in a surface hardness of HRC58~62. This provides it with strong resistance to erosion and wear from mud and sand impurities, fatigue from high-frequency reciprocating opening and closing, and impact from sudden stalling. Even if fine dust particles are mixed into the hydraulic oil in mining conditions, it is not easy to damage the sealing surfaces.

Packaging & Shipping

We use high-strength, environmentally friendly paper export packaging, which is reinforced, cushioned, and moisture-proof, suitable for long-distance international logistics transportation, and meets cross-border freight and environmental protection standards. International transportation adopts formal cross-border logistics, with full tracking of logistics information and supporting customs clearance documents to ensure smooth customs clearance and timely delivery of goods overseas.

Company Introduction

The GVO brand is a manufacturer of hydraulic components. We mainly produce the most comprehensive range of pilot pumps, gear pumps, relief valves, hydraulic pumps, electrical components, hydraulic parts, engine assemblies, traveling assemblies, rotating assemblies, distribution valves, and other components.

We are factory direct sellers without any middlemen profiting from price differences. The quality is definitely the best for you because we are the ones who produce them. We cannot tarnish our reputation. The prices are also the most favorable for you. There is a stable delivery speed.

We value every customer and provide you with the best service. We offer pre-sale, in-sale, and after-sale guarantees. Any problems will definitely be resolved for you. We are always available to serve you.