723-90-61400 Auxiliary Relief Valve Pressure Relief Valve Safety Valve PC400-6

Product Specification

723-90-61400 Auxiliary Relief Valve Pressure Relief Valve Safety Valve PC400-6 PC130-7 PC130-8 PC400-8 PC200-8 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-precision excavator main relief valve is custom-designed for Komatsu's various tonnage models, perfectly compatible with the PC130-7 and PC130-8 small to medium-sized 13-ton excavators and the PC400-8 40-ton heavy-duty mining excavator. It is a multi-way distribution valve with a built-in main pressure relief valve, commonly referred to in the industry as a hydraulic main valve, overload safety valve, or system pressure regulating valve. It is a core pressure safety component shared by the hydraulic systems of these two significantly different machines.

In the hydraulic working circuit, the relief valve plays three decisive roles: locking the maximum safe working pressure of the hydraulic system, automatically relieving overload pressure when the load exceeds the limit, and buffering the oil circuit pressure impact to stabilize the oil pressure output. It directly determines the flexible digging force of the PC130-7/130-8 in narrow spaces and the smoothness of municipal pipeline trench operations. At the same time, it ensures the ultimate hydraulic thrust of the PC400-8 for hard rock stripping, heavy-duty crushing, and steep slope walking in mines. It plays a fundamental control role in the machine's excavation burst force, lifting load capacity, and rotation and walking traction. The product strictly follows the original Komatsu parts drawings for parameter calibration and structural mold making. The valve core flow orifice diameter, pressure spring load, push rod stroke, mounting thread specifications, hexagonal assembly slots, and drain hole position are all aligned with the original parts. Both the 13-ton mini excavator and the 40-ton heavy-duty excavator can achieve non-destructive direct replacement of the valve cavity. Repair and disassembly do not require grinding the valve block or adding adjustment shims. Replacement can be completed by hand. It is an essential wear part for hydraulic overhaul and pressure insufficient fault repair of these three Komatsu models in municipal small projects and heavy-duty mining construction scenarios. It covers the needs of individual machine owners for self-repair, repair shops for replacement, parts suppliers for bulk stocking, and overseas construction machinery parts for export.

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.