723-40-92101 723-40-92102 723-40-92103 Main Relief Valve Pressure Relief Valve

Product Specification

723-40-92101 723-40-92102 723-40-92103 Main Relief Valve Pressure Relief Valve PC300-7 PC350-7 PC360-7 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 cartridge-type hydraulic main relief valve is custom-developed for Komatsu's classic 30-ton mining heavy-duty excavators (generation 7). It is precisely compatible with the PC300-7, PC350-7, and PC360-7, three main direct-injection models. It is a multi-way main control distribution valve with a built-in cartridge-type pressure relief valve, commonly known in the industry as a hydraulic main cannon, overload safety valve, or system pressure regulating valve. It is the core pressure reference and a key component for overload safety protection in the high-pressure hydraulic circuit of medium-to-large tonnage heavy-duty excavators.

In the entire high-pressure hydraulic transmission system, this relief valve performs three crucial functions: setting and locking the maximum safe working pressure of the hydraulic system; automatically unloading and depressurizing during heavy loads and overloads; and buffering pipeline pressure shocks to stabilize the overall circuit oil pressure output. It directly determines the PC300-7's conventional heavy-duty earthmoving excavation force, the PC350-7's ultimate thrust for hard rock stripping in mining, and the PC360-7's... The enhanced heavy-duty hydraulic breaker model features high-frequency impact stability, providing fundamental control and ultimate protection for the machine's full-load lifting capacity, traction force, and swing output torque.

The product is meticulously replicated according to Komatsu's original valve engineering drawings, with a 1:1 matching of all parameters including insert outer diameter, valve core stroke, flow passage cross-sectional area, pressure spring load coefficient, and upper and lower thread specifications. The insert valve stem size, hexagonal locking position, and top pressure relief hole arrangement are completely replicated from the original structure. All three models allow for non-destructive direct insertion replacement of the distribution valve chamber. Maintenance and disassembly do not require grinding the valve bore inner wall or adding adjusting shims; simply remove the old valve and insert the new one, locking it in place for complete assembly.

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.