723-46-42800 Excavator PC300-7 PC350-7 PC350-8 PC360-7 PC400-7 PC450-7 PC550LC-8 Auxiliary Relief Valve Pressure Relief Valve

723-46-42800 Excavator PC300-7 PC350-7 PC350-8 PC360-7 PC400-7 PC450-7 PC550LC-8 Auxiliary Relief 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 high-precision hydraulic main relief valve is precisely manufactured to match the three main models of Komatsu's medium-to-large tonnage heavy-duty excavators: PC300-7, PC350-7, and PC350-8. It is a multi-way distribution valve with built-in pressure control relief valve, commonly known in the industry as the "main cannon," overload safety valve, or pressure regulating valve. It is a core pressure safety component in the hydraulic system of 30-ton heavy-duty excavators.

The valve body is made of high-alloy structural steel, integrally forged and formed from a single blank. It undergoes a dual strengthening process of high-temperature tempering heat treatment and surface high-frequency quenching, significantly improving the overall hardness of the valve body. It can withstand instantaneous peak high-pressure impacts for extended periods and will not experience valve body deformation, thread stripping, or body cracking even under long-term immersion in high-temperature hydraulic oil and continuous scouring by oil impurities.

The valve core and seat employ an ultra-precision inner and outer circular grinding process, while the sealing cone surface undergoes mirror honing and polishing. Micron-level clearance eliminates common problems such as high-pressure internal leakage, pressure drop during hot starts, and slow pressure release. The internal pressure spring is made of high-temperature resistant chromium-vanadium alloy spring steel, having undergone tens of thousands of reciprocating opening and closing fatigue tests. Under long-term high-intensity operation, the spring force decays only slightly, and the overflow start-up pressure remains constant over time, preventing spring fatigue and breakage that could lead to pressure loss.

The external connection threads are precision rolled, with standard pitch and a tight fit. It is equipped with oil-resistant, high and low temperature resistant, and aging-resistant fluororubber O-rings, ensuring no bulging or leakage under high-temperature and high-pressure conditions.

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.