GVO 536-7311 5367311 Pilot-operated Pressure Reducing Valve Safety Valve E320GC

Product Specification

GVO 536-7311 5367311 Pilot-operated Pressure Reducing Valve Safety Valve E320GC E323GC E340GC E330GC E336GC 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 high-end replacement threaded cartridge relief valve is specifically designed for the new generation GC series intelligent hydraulic excavators, fully covering multiple main tonnage models including E320GC, E323GC, E330GC, E336GC, and E340GC. It is the core safety valve for pressure control within the main control multi-way valve system of the entire machine, and is often referred to by industry maintenance personnel as the main pressure relief valve, system overload pressure regulating valve, and multi-way valve main safety valve.

The valve body is made of high-strength alloy structural steel in a single forged blank, undergoing a dual heat treatment process of tempering and quenching + tempering. This significantly improves the overall structural rigidity, pressure resistance, deformation resistance, and fatigue impact resistance of the valve body, enabling it to withstand the high-frequency pressure pulse impacts of a 30-ton excavator's hydraulic system for extended periods without the risk of valve body tensile deformation or thread stripping and breakage under stress.

The outer surface of the valve body undergoes hot-dip galvanizing passivation treatment, providing excellent rust prevention, resistance to hydraulic oil corrosion, and resistance to mud and dust erosion. Even in harsh environments such as mining and gravel construction sites, muddy construction sites, and long-term outdoor storage, the surface is not prone to oxidation or pitting. Repeated disassembly and assembly maintains smooth thread engagement, ensuring maximum durability.

Internally, the core valve core, valve sleeve, and pilot control plunger all undergo multiple precision machining processes, including centerless outer diameter grinding, high-precision inner bore honing, and valve port mirror polishing. The clearance between components is controlled within micron-level tolerances, ensuring near-zero internal leakage sealing under high-pressure lock-up conditions and guaranteeing smooth, unobstructed valve core opening and closing. This minimizes the risk of valve core jamming or overflow caused by fine impurities in the hydraulic oil.

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.