723-40-90101 723-40-90100 Main Control Valve Pressure Relief Valve PC300-6 PC240

Product Specification

723-40-90101 723-40-90100 Main Control Valve Pressure Relief Valve PC300-6 PC240-7 PC290-8 PC340-6 PC350-6 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 heavy-duty cartridge-type main relief valve is a core pressure control component developed based on Komatsu's original hydraulic valve drawings, pressure parameters, and valve chamber installation structure. It comprehensively covers older 30-ton direct-injection mining machines such as the PC300-6, PC340-6, and PC350-6, medium-tonnage earthmoving machines such as the PC240-7, and the new electronically enhanced PC290-8 excavator. As a multi-way distribution valve with built-in main safety valve, it performs three core functions: limiting the maximum pressure of the entire machine's hydraulic system, providing pressure relief during heavy-load instantaneous overload, and maintaining pressure under continuous load.

The PC240-7, a 24-ton class main-duty earthmoving excavator, is primarily used in light to medium-load engineering scenarios such as municipal road construction, stormwater and sewage pipe network excavation, site leveling, small-scale earthwork transportation, and old building demolition. Its valve body features a built-in standard elastic pressure regulating spring, exhibiting excellent linearity in oil pressure opening and overflow return. Under light-load, precise control, system pressure fluctuations are minimal. The synchronized compound movements of raising the boom, retracting the bucket, and rotating are smooth and vibration-free, with an operating feel very close to the original factory standard, fully meeting the stable pressure requirements for stable operation in civil infrastructure construction.

The PC290-8 electronically controlled version offers even faster hydraulic response and is commonly used in high-intensity conditions such as deep pit excavation, heavy-load full-bucket incline operations, and prolonged high-frequency hammer strikes. Internally, it uses a higher fatigue-resistant alloy pressure spring, which is resistant to fatigue and failure even after tens of thousands of compression cycles. During long-term, continuous full-load operation, the oil pressure remains constant without sudden drops, preventing the oil pressure from plummeting and digging power from rapid attenuation due to spring fatigue.

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.