GVO 723-90-76300 Excavator Parts PC200-7 PC210-7 PC240-8 300-7 Main Control Valve Pressure Relief Valve

GVO 723-90-76300 Excavator Parts PC200-7 PC210-7 PC240-8 300-7 Main Control Valve Pressure Relief Valve

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 heavy-duty cartridge-type main relief valve is a core pressure control component specifically designed for Komatsu's 7th generation mechanical hydraulic and 8th generation electric hybrid models. It is precisely compatible with the PC200-7, PC210-7 classic 20-ton 7th generation direct-injection mechanical version, PC240-8 electric-upgraded earthmoving machine, and PC300-7 30-ton heavy-duty mining machine. As a main control multi-way valve with built-in safety pressure regulating assembly, it undertakes three core functions: controlling the maximum pressure limit of the entire machine's hydraulic system, providing pressure relief during heavy-load instantaneous overload, and maintaining pressure under continuous load.

The valve core guide sliding position at the top of the valve body uses a high-temperature resistant fluororubber composite sealing ring, which can withstand the ultra-high oil temperature in the closed engine room during summer, corrosion from deteriorated hydraulic oil, and hardening, cracking, and permanent deformation failure of the sealing ring caused by the temperature difference between day and night throughout the year. The middle section of the valve body features two independent stepped sealing grooves, reinforced with thickened oil-resistant nitrile rubber O-rings. The double-seal system forms a closed-loop protection system, completely preventing high-pressure hydraulic oil from leaking outwards from the interface between the valve body and the multi-way distribution valve. Even under conditions of prolonged, rough, and rushed operation—such as muddy construction sites, dusty quarries, and inadequate hydraulic oil filter maintenance with poor oil cleanliness—there will be no risk of external oil leakage or seepage through threaded gaps.

The cartridge-type external thread is manufactured using a precision rolling process, resulting in a full, regular, and highly smooth thread profile. It screws smoothly into the valve cavity without chipping or stripping, preventing damage to the internal valve threads and avoiding secondary repair and rework costs. The large hexagonal locking nut at the bottom distributes force evenly, ensuring the valve body remains firmly secured throughout the PC300-7's heavy-duty excavation impacts, off-road vibrations, and high-frequency rotation and start-stop processes. This effectively avoids system pressure drift and fluctuations caused by long-term vibrations.

 The valve body undergoes a blackening and passivation process to prevent rust and corrosion, exhibiting excellent resistance to rust from construction site mud and water, as well as electrochemical corrosion in humid environments. Even older 7th generation models, which are often left outdoors for extended periods or installed in humid underground mining conditions, are less prone to rusting and valve core jamming. This significantly reduces the labor costs associated with repeated disassembly, cleaning, and pressure recalibration by maintenance personnel, as well as the project delays caused by sudden equipment shutdowns. It is highly compatible with the high-intensity 24-hour shift operation mode of multiple equipment units operated by engineering rental companies.

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.