GVO 723-46-45200 Pressure Relief Valve Pressure Compensation Valve Safety Valve

Product Specification

GVO 723-46-45200 Pressure Relief Valve Pressure Compensation Valve Safety Valve PC400-6 PC450-6 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

The GVO cartridge-style main relief valve is a critical pressure-safety component designed specifically for Komatsu PC400-6 and PC450-6 heavy-duty, high-tonnage excavators. Serving as the ultimate pressure-regulating safety valve within the control valve assembly, it plays a pivotal role in limiting the system's maximum pressure, providing instantaneous pressure relief during heavy-load spikes, and stabilizing pressure under sustained loads. It directly determines the excavator's digging and cutting force and the stability of simultaneous operations, while also providing a fail-safe safeguard against overloads for high-value core hydraulic components such as the main pump, hydraulic cylinders, travel motors, and high-pressure lines.

The valve’s integrated multi-layer sealing system and robust mechanical structure are engineered to withstand the harsh operating environments typical of open-pit mining. Comprehensive reinforcements and upgrades address critical challenges such as extreme oil temperatures in enclosed engine compartments during summer, thermal cycling caused by day-night temperature fluctuations, exposure to mud and dust, and high-frequency vibrations during heavy-duty operation.

The upper sliding section of the valve body features a composite seal made of ultra-high-temperature resistant fluororubber, designed to withstand long-term exposure to corrosive, degraded hydraulic oil and to resist hardening, cracking, or permanent deformation caused by rapid temperature swings. The middle section incorporates two independent stepped grooves fitted with thickened, oil-resistant nitrile rubber O-rings; this multi-layer sealing configuration creates a robust barrier that completely prevents high-pressure hydraulic oil from leaking at the interface between the valve body and the control valve block. Even under grueling conditions—such as continuous operation in muddy mines during the rainy season, quarries filled with airborne dust, or scenarios involving poor oil cleanliness due to delayed maintenance—the valve remains free from external oil bypass or leakage through threaded connections.

The external threads of the cartridge assembly are precision-formed via an integrated rolling process, resulting in a full, uniform thread profile and a high-quality surface finish; this ensures smooth engagement during installation into the multi-way valve cavity, eliminating risks such as thread galling or stripping that could compromise the valve body's internal threads. The large hexagonal locking nut at the base distributes load evenly, ensuring the valve body remains securely fastened without loosening or shifting—even under the heavy-duty digging impacts, rough off-road transit, and high-frequency slewing vibrations typical of large excavators—thereby effectively preventing system pressure drift or instability caused by prolonged vibration.

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.