723-40-91500 Hydraulic Main Relief Valve Pressure Relief Valve Action Control

Product Specification

723-40-91500 Hydraulic Main Relief Valve Pressure Relief Valve Action Control Valve PC200-7 PC200-8 PC300-7 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 cartridge-style main relief valve is designed for Komatsu PC200-7, PC200-8, and PC300-7 excavator models. It serves as a critical pressure protection component within the hydraulic main control system, directly determining the system's pressure stability, operational coordination, and load-bearing capacity.

The valve body is precision-machined via CNC turning from a solid, high-strength alloy steel bar. The internal spool and valve seat undergo a dual-hardening process—combining high-frequency quenching with precision honing—to achieve industry-leading hardness levels. This ensures effective resistance against high-speed, high-pressure hydraulic fluid erosion, abrasive wear from particulate contaminants, and fatigue caused by frequent shock loads.

Engineered to precisely replicate the hydraulic circuit specifications of these classic Komatsu models, the valve’s thread specifications, cartridge outer diameter, port locations, and seal groove dimensions fully match OEM standards. It allows for direct installation without modifying the valve block or grinding mounting holes, fitting perfectly into the main control valve cavity. It is fully compatible with the hydraulic logic of the PC200-7’s classic control valve, the PC200-8’s upgraded electronic control valve, and the PC300-7’s heavy-duty multi-way valve. By eliminating dimensional discrepancies, it fundamentally prevents secondary failures such as internal leakage, pressure regulation failure, and scoring of the valve block, thereby providing reliable system pressure protection for 20-ton and 30-ton class Komatsu excavators.

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.