708-2L-04523 708-2L-35860 708-2L-34330 Hydraulic Pump PC Valve Pressure Relief

Product Specification

708-2L-04523 708-2L-35860 708-2L-34330 Hydraulic Pump PC Valve Pressure Relief Valve PC200-6 PC220-6 228UU-1 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 multi-stage cartridge relief valve is a core pressure control component in the hydraulic system of Komatsu's classic 6th generation main models. It precisely covers the PC200-6 and PC220-6 standard 20-ton excavators, while also perfectly adapting to the PC228UU-1 large tailless swing excavator. It can be used as both a main control distribution valve, a main relief valve, and a swing motor overload protection valve. It is a highly sought-after hydraulic wear part in the Komatsu 6th generation machine market, requiring significant replacement demand.

In terms of heat treatment strengthening and precision machining of the valve core coupling, this PC200-6/220-6/228UU-1The general-purpose relief valve strictly adheres to the complete set of heavy-duty hydraulic component manufacturing standards. The valve body undergoes tempering and quenching to enhance structural toughness, and the outer circumference is subjected to high-precision centerless grinding and polishing throughout. The valve stem surface has an extremely high degree of smoothness, resisting long-term erosion and scratches from iron filings and sand particles in the hydraulic oil, preventing internal wall scoring and continuous internal pressure leakage.

The multi-stage segmented valve core and seat sealing pair utilizes deep-hole high-precision honing + The dual process of ultra-mirror grinding, combined with gap control at the micron level, maximizes pressure sensing sensitivity and achieves millisecond-level triggering for opening and closing response. When the instantaneous load pressure of the hydraulic system exceeds the rated safety threshold of the equipment, the valve core can instantly open to overflow and relieve pressure, and immediately and precisely reseat to lock pressure when the pressure drops. This fundamentally solves a series of typical problems of Komatsu 6th generation machines caused by the aging and failure of the overflow valve, including weak digging force of the whole machine, slow boom drop due to its own weight, weak and stuck boom retraction action, pressure drop in bucket digging load, shaking and tailing during swing and steering, insufficient pressure under heavy load, stalling speed drop, and abnormal rise in hydraulic oil temperature, which have long plagued machine owners.

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.