709-70-71203 Excavator PC200-5 PC210-5K PC210-6 PC220-5 PC300-6 PC400-6 Auxiliary Relief Valve Pressure Relief Valve

709-70-71203 Excavator PC200-5 PC210-5K PC210-6 PC220-5 PC300-6 PC400-6 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 brand excavator main relief valve is custom-designed for Komatsu's classic older models PC200-5, PC210-6, and PC220-5. It is a core pressure safety protection component of the excavator's hydraulic main control valve, often referred to in the industry as a distributor relief valve, main gun pressure valve, or overload safety valve. In the overall hydraulic system, it plays three core roles: pressure limiting, overload relief, and system pressure stabilization, directly determining the digging force, boom lifting power, travel traction, and the overall stability of the hydraulic circuit.

The valve core and seat are precision-ground and matched, with the clearance controlled at the micron level. The sealing cone surface is mirror-polished to prevent internal hydraulic oil leakage under high pressure.

It features an imported high-temperature resistant helical pressure spring with high fatigue strength. Even after tens of thousands of opening and closing cycles, it will not experience spring force attenuation or breakage, maintaining a consistently stable pressure settling value.

The exposed threads are made using a precision rolling process, with standard pitch and tight engagement. They are equipped with aging-resistant fluororubber O-rings, which prevent oil leakage and ring bulging under high pressure, completely solving the common problems of oil leakage and weak pressure relief in old overflow valves.

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.